Address Details

contract

// SPDX-License-Identifier: AGPLv3
pragma solidity 0.8.19;

import { IERC721Metadata } from "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";
import { IConstantOutflowNFT } from "../interfaces/superfluid/IConstantOutflowNFT.sol";
import { IConstantInflowNFT } from "../interfaces/superfluid/IConstantInflowNFT.sol";
import { ISuperfluid } from "../interfaces/superfluid/ISuperfluid.sol";
import { FlowNFTBase, IFlowNFTBase } from "./FlowNFTBase.sol";

/// @title ConstantInflowNFT Contract (CIF NFT)
/// @author Superfluid
/// @notice The ConstantInflowNFT contract to be minted to the flow sender on flow creation.
/// @dev This contract does not hold any storage, but references the ConstantOutflowNFT contract storage.
contract ConstantInflowNFT is FlowNFTBase, IConstantInflowNFT {
    IConstantOutflowNFT public immutable CONSTANT_OUTFLOW_NFT;

    // solhint-disable-next-line no-empty-blocks
    constructor(
        ISuperfluid host,
        IConstantOutflowNFT constantOutflowNFT
    ) FlowNFTBase(host) {
        CONSTANT_OUTFLOW_NFT = constantOutflowNFT;
    }

    function proxiableUUID() public pure override returns (bytes32) {
        return
            keccak256(
                "org.superfluid-finance.contracts.ConstantInflowNFT.implementation"
            );
    }

    /// @notice The mint function emits the "mint" `Transfer` event.
    /// @dev We don't modify storage as this is handled in ConstantOutflowNFT.sol and this function's sole purpose
    /// is to inform clients that search for events.
    /// Only callable by ConstantOutflowNFT
    /// @param to the receiver of the inflow nft and desired flow receiver
    /// @param newTokenId the new token id
    function mint(
        address to,
        uint256 newTokenId
    ) external onlyConstantOutflowNFT {
        _mint(to, newTokenId);
    }

    /// @notice This burn function emits the "burn" `Transfer` event.
    /// @dev We don't modify storage as this is handled in ConstantOutflowNFT.sol and this function's sole purpose
    /// is to inform clients that search for events.
    /// Only callable by ConstantOutflowNFT
    /// @param tokenId desired token id to burn
    function burn(uint256 tokenId) external onlyConstantOutflowNFT {
        _burn(tokenId);
    }

    function flowDataByTokenId(
        uint256 tokenId
    )
        public
        view
        override(FlowNFTBase, IFlowNFTBase)
        returns (FlowNFTData memory flowData)
    {
        flowData = CONSTANT_OUTFLOW_NFT.flowDataByTokenId(tokenId);
    }

    function tokenURI(
        uint256 tokenId
    )
        external
        view
        override(FlowNFTBase, IERC721Metadata)
        returns (string memory)
    {
        return _tokenURI(tokenId, true);
    }

    /// @inheritdoc FlowNFTBase
    function _ownerOf(
        uint256 tokenId
    ) internal view virtual override returns (address) {
        FlowNFTData memory flowData = flowDataByTokenId(tokenId);
        return flowData.flowReceiver;
    }

    /// @notice Transfer is currently not allowed.
    /// @dev Will revert currently.
    function _transfer(
        address, // from,
        address, // to,
        uint256 // tokenId
    ) internal virtual override {
        revert CFA_NFT_TRANSFER_IS_NOT_ALLOWED();
    }

    function _mint(address to, uint256 newTokenId) internal {
        emit Transfer(address(0), to, newTokenId);
    }

    function _burn(uint256 tokenId) internal override {
        FlowNFTData memory flowData = flowDataByTokenId(tokenId);

        super._burn(tokenId);

        emit Transfer(flowData.flowReceiver, address(0), tokenId);
    }

    modifier onlyConstantOutflowNFT() {
        if (msg.sender != address(CONSTANT_OUTFLOW_NFT)) {
            revert CIF_NFT_ONLY_CONSTANT_OUTFLOW();
        }
        _;
    }
}
        

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator,
        Rounding rounding
    ) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10**64) {
                value /= 10**64;
                result += 64;
            }
            if (value >= 10**32) {
                value /= 10**32;
                result += 32;
            }
            if (value >= 10**16) {
                value /= 10**16;
                result += 16;
            }
            if (value >= 10**8) {
                value /= 10**8;
                result += 8;
            }
            if (value >= 10**4) {
                value /= 10**4;
                result += 4;
            }
            if (value >= 10**2) {
                value /= 10**2;
                result += 2;
            }
            if (value >= 10**1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC777/IERC777.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC777Token standard as defined in the EIP.
 *
 * This contract uses the
 * https://eips.ethereum.org/EIPS/eip-1820[ERC1820 registry standard] to let
 * token holders and recipients react to token movements by using setting implementers
 * for the associated interfaces in said registry. See {IERC1820Registry} and
 * {ERC1820Implementer}.
 */
interface IERC777 {
    /**
     * @dev Emitted when `amount` tokens are created by `operator` and assigned to `to`.
     *
     * Note that some additional user `data` and `operatorData` can be logged in the event.
     */
    event Minted(address indexed operator, address indexed to, uint256 amount, bytes data, bytes operatorData);

    /**
     * @dev Emitted when `operator` destroys `amount` tokens from `account`.
     *
     * Note that some additional user `data` and `operatorData` can be logged in the event.
     */
    event Burned(address indexed operator, address indexed from, uint256 amount, bytes data, bytes operatorData);

    /**
     * @dev Emitted when `operator` is made operator for `tokenHolder`.
     */
    event AuthorizedOperator(address indexed operator, address indexed tokenHolder);

    /**
     * @dev Emitted when `operator` is revoked its operator status for `tokenHolder`.
     */
    event RevokedOperator(address indexed operator, address indexed tokenHolder);

    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the smallest part of the token that is not divisible. This
     * means all token operations (creation, movement and destruction) must have
     * amounts that are a multiple of this number.
     *
     * For most token contracts, this value will equal 1.
     */
    function granularity() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by an account (`owner`).
     */
    function balanceOf(address owner) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * If send or receive hooks are registered for the caller and `recipient`,
     * the corresponding functions will be called with `data` and empty
     * `operatorData`. See {IERC777Sender} and {IERC777Recipient}.
     *
     * Emits a {Sent} event.
     *
     * Requirements
     *
     * - the caller must have at least `amount` tokens.
     * - `recipient` cannot be the zero address.
     * - if `recipient` is a contract, it must implement the {IERC777Recipient}
     * interface.
     */
    function send(
        address recipient,
        uint256 amount,
        bytes calldata data
    ) external;

    /**
     * @dev Destroys `amount` tokens from the caller's account, reducing the
     * total supply.
     *
     * If a send hook is registered for the caller, the corresponding function
     * will be called with `data` and empty `operatorData`. See {IERC777Sender}.
     *
     * Emits a {Burned} event.
     *
     * Requirements
     *
     * - the caller must have at least `amount` tokens.
     */
    function burn(uint256 amount, bytes calldata data) external;

    /**
     * @dev Returns true if an account is an operator of `tokenHolder`.
     * Operators can send and burn tokens on behalf of their owners. All
     * accounts are their own operator.
     *
     * See {operatorSend} and {operatorBurn}.
     */
    function isOperatorFor(address operator, address tokenHolder) external view returns (bool);

    /**
     * @dev Make an account an operator of the caller.
     *
     * See {isOperatorFor}.
     *
     * Emits an {AuthorizedOperator} event.
     *
     * Requirements
     *
     * - `operator` cannot be calling address.
     */
    function authorizeOperator(address operator) external;

    /**
     * @dev Revoke an account's operator status for the caller.
     *
     * See {isOperatorFor} and {defaultOperators}.
     *
     * Emits a {RevokedOperator} event.
     *
     * Requirements
     *
     * - `operator` cannot be calling address.
     */
    function revokeOperator(address operator) external;

    /**
     * @dev Returns the list of default operators. These accounts are operators
     * for all token holders, even if {authorizeOperator} was never called on
     * them.
     *
     * This list is immutable, but individual holders may revoke these via
     * {revokeOperator}, in which case {isOperatorFor} will return false.
     */
    function defaultOperators() external view returns (address[] memory);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient`. The caller must
     * be an operator of `sender`.
     *
     * If send or receive hooks are registered for `sender` and `recipient`,
     * the corresponding functions will be called with `data` and
     * `operatorData`. See {IERC777Sender} and {IERC777Recipient}.
     *
     * Emits a {Sent} event.
     *
     * Requirements
     *
     * - `sender` cannot be the zero address.
     * - `sender` must have at least `amount` tokens.
     * - the caller must be an operator for `sender`.
     * - `recipient` cannot be the zero address.
     * - if `recipient` is a contract, it must implement the {IERC777Recipient}
     * interface.
     */
    function operatorSend(
        address sender,
        address recipient,
        uint256 amount,
        bytes calldata data,
        bytes calldata operatorData
    ) external;

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the total supply.
     * The caller must be an operator of `account`.
     *
     * If a send hook is registered for `account`, the corresponding function
     * will be called with `data` and `operatorData`. See {IERC777Sender}.
     *
     * Emits a {Burned} event.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     * - the caller must be an operator for `account`.
     */
    function operatorBurn(
        address account,
        uint256 amount,
        bytes calldata data,
        bytes calldata operatorData
    ) external;

    event Sent(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256 amount,
        bytes data,
        bytes operatorData
    );
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/Address.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!Address.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Internal function that returns the initialized version. Returns `_initialized`
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Internal function that returns the initialized version. Returns `_initializing`
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}
          

// SPDX-License-Identifier: AGPLv3
pragma solidity 0.8.19;

// We use reserved slots for upgradable contracts.
// solhint-disable max-states-count

// They are used in solidity docs.
import {
    // solhint-disable-next-line no-unused-import
    IERC165, IERC721, IERC721Metadata
} from "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";

import { UUPSProxiable } from "../upgradability/UUPSProxiable.sol";
import { Strings } from "@openzeppelin/contracts/utils/Strings.sol";
import {
    ISuperfluid, ISuperToken, ISuperTokenFactory, IFlowNFTBase, IConstantFlowAgreementV1
} from "../interfaces/superfluid/ISuperfluid.sol";

/// @title FlowNFTBase abstract contract
/// @author Superfluid
/// @notice The abstract contract to be inherited by the Flow NFTs.
/// @dev This contract inherits from IFlowNFTBase which inherits from
/// IERC721Metadata and holds shared storage and functions for the two NFT contracts.
/// This contract is upgradeable and it inherits from our own ad-hoc UUPSProxiable contract which allows.
/// NOTE: the storage gap allows us to add an additional 16 storage variables to this contract without breaking child
/// COFNFT or CIFNFT storage.
abstract contract FlowNFTBase is UUPSProxiable, IFlowNFTBase {
    using Strings for uint256;

    string public constant DEFAULT_BASE_URI = "https://nft.superfluid.finance/cfa/v2/getmeta";

    function baseURI() public pure returns (string memory) { return DEFAULT_BASE_URI; }

    /// @notice ConstantFlowAgreementV1 contract address
    /// @dev This is the address of the CFAv1 contract cached so we don't have to
    /// do an external call for every flow created.
    // solhint-disable-next-line var-name-mixedcase
    IConstantFlowAgreementV1 public immutable CONSTANT_FLOW_AGREEMENT_V1;

    /// @notice Superfluid host contract address
    ISuperfluid public immutable HOST;

    /**************************************************************************
     * Storage variables
     *************************************************************************/
    /// NOTE: The storage variables in this contract MUST NOT:
    /// - change the ordering of the existing variables
    /// - change any of the variable types
    /// - rename any of the existing variables
    /// - remove any of the existing variables
    /// - add any new variables after _gap
    /// - add any new variables before _gap and NOT decrement the length of the _gap array
    /// Go to CFAv1NFTUpgradability.t.sol for the tests and make sure to add new tests for upgrades.

    string internal _name;
    string internal _symbol;

    /// @notice Mapping for token approvals
    /// @dev tokenID => approved address mapping
    mapping(uint256 => address) internal _tokenApprovals;

    /// @notice Mapping for operator approvals
    mapping(address => mapping(address => bool)) internal _operatorApprovals;

    /// @notice This allows us to add new storage variables in the base contract
    /// without having to worry about messing up the storage layout that exists in COFNFT or CIFNFT.
    /// @dev This empty reserved space is put in place to allow future versions to add new
    /// variables without shifting down storage in the inheritance chain.
    /// Slots 6-21 are reserved for future use.
    /// We use this pattern in SuperToken.sol and favor this over the OpenZeppelin pattern
    /// as this prevents silly footgunning.
    /// See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
    uint256 internal _reserve5;
    uint256 private _reserve6;
    uint256 private _reserve7;
    uint256 private _reserve8;
    uint256 private _reserve9;
    uint256 private _reserve10;
    uint256 private _reserve11;
    uint256 private _reserve12;
    uint256 private _reserve13;
    uint256 private _reserve14;
    uint256 private _reserve15;
    uint256 private _reserve16;
    uint256 private _reserve17;
    uint256 private _reserve18;
    uint256 private _reserve19;
    uint256 private _reserve20;
    uint256 internal _reserve21;

    constructor(ISuperfluid host) {
        HOST = host;
        CONSTANT_FLOW_AGREEMENT_V1 = IConstantFlowAgreementV1(
            address(
                ISuperfluid(host).getAgreementClass(
                    keccak256("org.superfluid-finance.agreements.ConstantFlowAgreement.v1")
                )
            )
        );
    }

    function initialize(
        string memory nftName,
        string memory nftSymbol
    )
        external
        override
        initializer // OpenZeppelin Initializable
    {
        _name = nftName;
        _symbol = nftSymbol;
    }

    function updateCode(address newAddress) external override {
        ISuperTokenFactory superTokenFactory = HOST.getSuperTokenFactory();
        if (msg.sender != address(superTokenFactory)) {
            revert CFA_NFT_ONLY_SUPER_TOKEN_FACTORY();
        }

        UUPSProxiable._updateCodeAddress(newAddress);
    }

    /// @notice Emits the MetadataUpdate event with `tokenId` as the argument.
    /// @dev Callable by anyone.
    /// @param tokenId the token id to trigger a metaupdate for
    function triggerMetadataUpdate(uint256 tokenId) external {
        _triggerMetadataUpdate(tokenId);
    }

    /// @notice This contract supports IERC165, IERC721 and IERC721Metadata
    /// @dev This is part of the Standard Interface Detection EIP: https://eips.ethereum.org/EIPS/eip-165
    /// @param interfaceId the XOR of all function selectors in the interface
    /// @return boolean true if the interface is supported
    /// @inheritdoc IERC165
    function supportsInterface(
        bytes4 interfaceId
    ) external pure virtual override returns (bool) {
        return
            interfaceId == 0x01ffc9a7 || // ERC165 Interface ID for ERC165
            interfaceId == 0x80ac58cd || // ERC165 Interface ID for ERC721
            interfaceId == 0x5b5e139f; // ERC165 Interface ID for ERC721Metadata
    }

    /// @inheritdoc IERC721
    function ownerOf(
        uint256 tokenId
    ) public view virtual override returns (address) {
        address owner = _ownerOf(tokenId);
        if (owner == address(0)) {
            revert CFA_NFT_INVALID_TOKEN_ID();
        }
        return owner;
    }

    /// @notice Returns a hardcoded balance of 1
    /// @dev We always return 1 to avoid the need for additional mapping
    /// @return balance = 1
    function balanceOf(
        address // owner
    ) external pure returns (uint256 balance) {
        balance = 1;
    }

    /// @notice Returns the name of the NFT
    /// @dev Should follow the naming convention: TOKENx Constant Outflow/Inflow NFT
    /// @return name of the NFT
    function name() external view virtual override returns (string memory) {
        return _name;
    }

    /// @notice Returns the symbol of the NFT
    /// @dev Should follow the naming convention: TOKENx(COF/CIF)
    /// @return symbol of the NFT
    function symbol() external view virtual override returns (string memory) {
        return _symbol;
    }

    /// @notice This returns the Uniform Resource Identifier (URI), where the metadata for the NFT lives.
    /// @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
    /// @return the token URI
    function tokenURI(
        uint256 tokenId
    ) external view virtual returns (string memory);

    function _tokenURI(
        uint256 tokenId,
        bool isInflow
    ) internal view virtual returns (string memory) {
        FlowNFTData memory flowData = flowDataByTokenId(tokenId);

        ISuperToken token = ISuperToken(flowData.superToken);

        (, int96 flowRate, , ) = CONSTANT_FLOW_AGREEMENT_V1.getFlow(
            token,
            flowData.flowSender,
            flowData.flowReceiver
        );

        return
            string(
                abi.encodePacked(
                    baseURI(),
                    "?flowRate=",
                    uint256(uint96(flowRate)).toString(),
                    "&outgoing=",
                    isInflow ? "false" : "true",
                    _flowDataString(tokenId)
                )
            );
    }

    function _flowDataString(
        uint256 tokenId
    ) internal view returns (string memory) {
        FlowNFTData memory flowData = flowDataByTokenId(tokenId);

        // @note taking this out to deal with the stack too deep issue
        // which occurs when you are attempting to abi.encodePacked
        // too many elements
        return
            string(
                abi.encodePacked(
                    "&token_address=",
                    Strings.toHexString(
                        uint256(uint160(flowData.superToken)),
                        20
                    ),
                    "&chain_id=",
                    block.chainid.toString(),
                    "&token_symbol=",
                    ISuperToken(flowData.superToken).symbol(),
                    "&sender=",
                    Strings.toHexString(
                        uint256(uint160(flowData.flowSender)),
                        20
                    ),
                    "&receiver=",
                    Strings.toHexString(
                        uint256(uint160(flowData.flowReceiver)),
                        20
                    ),
                    "&token_decimals=",
                    uint256(ISuperToken(flowData.superToken).decimals())
                        .toString(),
                    "&start_date=",
                    // @note upcasting is safe
                    uint256(flowData.flowStartDate).toString()
                )
            );
    }

    /// @inheritdoc IERC721
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = FlowNFTBase.ownerOf(tokenId);
        if (to == owner) {
            revert CFA_NFT_APPROVE_TO_CURRENT_OWNER();
        }

        if (msg.sender != owner && !isApprovedForAll(owner, msg.sender)) {
            revert CFA_NFT_APPROVE_CALLER_NOT_OWNER_OR_APPROVED_FOR_ALL();
        }

        _approve(to, tokenId);
    }

    /// @inheritdoc IFlowNFTBase
    function getTokenId(
        address superToken,
        address sender,
        address receiver
    ) external view returns (uint256 tokenId) {
        tokenId = _getTokenId(superToken, sender, receiver);
    }

    function _getTokenId(
        address superToken,
        address sender,
        address receiver
    ) internal view returns (uint256 tokenId) {
        tokenId = uint256(
            keccak256(abi.encode(block.chainid, superToken, sender, receiver))
        );
    }

    /// @inheritdoc IERC721
    function getApproved(
        uint256 tokenId
    ) public view virtual override returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /// @inheritdoc IERC721
    function setApprovalForAll(
        address operator,
        bool approved
    ) external virtual override {
        _setApprovalForAll(msg.sender, operator, approved);
    }

    /// @inheritdoc IERC721
    function isApprovedForAll(
        address owner,
        address operator
    ) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /// @inheritdoc IERC721
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external virtual override {
        if (!_isApprovedOrOwner(msg.sender, tokenId)) {
            revert CFA_NFT_TRANSFER_CALLER_NOT_OWNER_OR_APPROVED_FOR_ALL();
        }

        _transfer(from, to, tokenId);
    }

    /// @inheritdoc IERC721
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /// @inheritdoc IERC721
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) public virtual override {
        if (!_isApprovedOrOwner(msg.sender, tokenId)) {
            revert CFA_NFT_TRANSFER_CALLER_NOT_OWNER_OR_APPROVED_FOR_ALL();
        }

        _safeTransfer(from, to, tokenId, data);
    }

    /// @notice Returns whether `spender` is allowed to manage `tokenId`.
    /// @dev Will revert if `tokenId` doesn't exist.
    /// @param spender the spender of the token
    /// @param tokenId the id of the token to be spent
    /// @return whether `tokenId` can be spent by `spender`
    function _isApprovedOrOwner(
        address spender,
        uint256 tokenId
    ) internal view returns (bool) {
        address owner = FlowNFTBase.ownerOf(tokenId);
        return (spender == owner ||
            isApprovedForAll(owner, spender) ||
            getApproved(tokenId) == spender);
    }

    /// @notice Reverts if `tokenId` doesn't exist
    /// @param tokenId the token id whose existence we are checking
    function _requireMinted(uint256 tokenId) internal view {
        if (!_exists(tokenId)) revert CFA_NFT_INVALID_TOKEN_ID();
    }

    /// @notice Returns whether `tokenId` exists
    /// @dev Explain to a developer any extra details
    /// Tokens can be managed by their owner or approved accounts via `approve` or `setApprovalForAll`.
    /// Tokens start existing when they are minted (`_mint`),
    /// and stop existing when they are burned (`_burn`).
    /// @param tokenId the token id we're interested in seeing if exists
    /// @return bool whether ot not the token exists
    function _exists(uint256 tokenId) internal view returns (bool) {
        return _ownerOf(tokenId) != address(0);
    }

    function _triggerMetadataUpdate(uint256 tokenId) internal {
        emit MetadataUpdate(tokenId);
    }

    function _approve(address to, uint256 tokenId) internal {
        _tokenApprovals[tokenId] = to;

        emit Approval(_ownerOf(tokenId), to, tokenId);
    }

    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal {
        if (owner == operator) revert CFA_NFT_APPROVE_TO_CALLER();

        _operatorApprovals[owner][operator] = approved;

        emit ApprovalForAll(owner, operator, approved);
    }

    /// @dev Returns the flow data of the `tokenId`. Does NOT revert if token doesn't exist.
    /// @param tokenId the token id whose existence we're checking
    /// @return flowData the FlowNFTData struct for `tokenId`
    function flowDataByTokenId(
        uint256 tokenId
    ) public view virtual returns (FlowNFTData memory flowData);

    /// @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist.
    /// @param tokenId the token id whose existence we're checking
    /// @return address the address of the owner of `tokenId`
    function _ownerOf(uint256 tokenId) internal view virtual returns (address);

    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual;

    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory // data
    ) internal virtual {
        _transfer(from, to, tokenId);
    }

    /// @dev Deletes the tokenApprovals for `tokenId`
    /// @param tokenId the token id whose approvals we're clearing
    function _burn(uint256 tokenId) internal virtual {
        // clear approvals from the previous owner
        delete _tokenApprovals[tokenId];
    }
}
          

// SPDX-License-Identifier: MIT
pragma solidity >= 0.8.11;

import { ISuperToken } from "../superfluid/ISuperToken.sol";


/**
 * @title Super ETH (SETH) custom token interface
 * @author Superfluid
 */
interface ISETHCustom {
    // using native token
    function upgradeByETH() external payable;
    function upgradeByETHTo(address to) external payable;
    function downgradeToETH(uint wad) external;
}

/**
 * @title Super ETH (SETH) full interface
 * @author Superfluid
 */
// solhint-disable-next-line no-empty-blocks
interface ISETH is ISETHCustom, ISuperToken {}
          

// SPDX-License-Identifier: AGPLv3
pragma solidity 0.8.19;

/**
 * @title UUPS (Universal Upgradeable Proxy Standard) Shared Library
 */
library UUPSUtils {

    /**
     * @dev Implementation slot constant.
     * Using https://eips.ethereum.org/EIPS/eip-1967 standard
     * Storage slot 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc
     * (obtained as bytes32(uint256(keccak256('eip1967.proxy.implementation')) - 1)).
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /// @dev Get implementation address.
    function implementation() internal view returns (address impl) {
        assembly { // solium-disable-line
            impl := sload(_IMPLEMENTATION_SLOT)
        }
    }

    /// @dev Set new implementation address.
    function setImplementation(address codeAddress) internal {
        assembly {
            // solium-disable-line
            sstore(
                _IMPLEMENTATION_SLOT,
                codeAddress
            )
        }
    }

}
          

// SPDX-License-Identifier: MIT
pragma solidity >= 0.8.11;

/**
 * @title ERC20 token info interface
 * @author Superfluid
 * @dev ERC20 standard interface does not specify these functions, but
 *      often the token implementations have them.
 */
interface TokenInfo {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() external view returns (uint8);
}
          

// SPDX-License-Identifier: AGPLv3
pragma solidity 0.8.19;

import { UUPSUtils } from "./UUPSUtils.sol";
import { Initializable } from "@openzeppelin/contracts/proxy/utils/Initializable.sol";

/**
 * @title UUPS (Universal Upgradeable Proxy Standard) Proxiable contract.
 */
abstract contract UUPSProxiable is Initializable {

    /**
     * @dev Get current implementation code address.
     */
    function getCodeAddress() public view returns (address codeAddress)
    {
        return UUPSUtils.implementation();
    }

    function updateCode(address newAddress) external virtual;

    // allows to mark logic contracts as initialized in order to reduce the attack surface
    // solhint-disable-next-line no-empty-blocks
    function castrate() external initializer { }

    /**
     * @dev Proxiable UUID marker function, this would help to avoid wrong logic
     *      contract to be used for upgrading.
     *
     * NOTE: The semantics of the UUID deviates from the actual UUPS standard,
     *       where it is equivalent of _IMPLEMENTATION_SLOT.
     */
    function proxiableUUID() public view virtual returns (bytes32);

    /**
     * @dev Update code address function.
     *      It is internal, so the derived contract could setup its own permission logic.
     */
    function _updateCodeAddress(address newAddress) internal
    {
        // require UUPSProxy.initializeProxy first
        require(UUPSUtils.implementation() != address(0), "UUPSProxiable: not upgradable");
        require(
            proxiableUUID() == UUPSProxiable(newAddress).proxiableUUID(),
            "UUPSProxiable: not compatible logic"
        );
        require(
            address(this) != newAddress,
            "UUPSProxiable: proxy loop"
        );
        UUPSUtils.setImplementation(newAddress);
        emit CodeUpdated(proxiableUUID(), newAddress);
    }

    event CodeUpdated(bytes32 uuid, address codeAddress);

}
          

// SPDX-License-Identifier: MIT
pragma solidity >= 0.8.11;

import { ISuperToken } from "./ISuperToken.sol";

/**
 * @title SuperApp interface
 * @author Superfluid
 * @dev Be aware of the app being jailed, when the word permitted is used.
 */
interface ISuperApp {

    /**
     * @dev Callback before a new agreement is created.
     * @param superToken The super token used for the agreement.
     * @param agreementClass The agreement class address.
     * @param agreementId The agreementId
     * @param agreementData The agreement data (non-compressed)
     * @param ctx The context data.
     * @return cbdata A free format in memory data the app can use to pass
     *          arbitary information to the after-hook callback.
     *
     * @custom:note 
     * - It will be invoked with `staticcall`, no state changes are permitted.
     * - Only revert with a "reason" is permitted.
     */
    function beforeAgreementCreated(
        ISuperToken superToken,
        address agreementClass,
        bytes32 agreementId,
        bytes calldata agreementData,
        bytes calldata ctx
    )
        external
        view
        returns (bytes memory cbdata);

    /**
     * @dev Callback after a new agreement is created.
     * @param superToken The super token used for the agreement.
     * @param agreementClass The agreement class address.
     * @param agreementId The agreementId
     * @param agreementData The agreement data (non-compressed)
     * @param cbdata The data returned from the before-hook callback.
     * @param ctx The context data.
     * @return newCtx The current context of the transaction.
     *
     * @custom:note 
     * - State changes is permitted.
     * - Only revert with a "reason" is permitted.
     */
    function afterAgreementCreated(
        ISuperToken superToken,
        address agreementClass,
        bytes32 agreementId,
        bytes calldata agreementData,
        bytes calldata cbdata,
        bytes calldata ctx
    )
        external
        returns (bytes memory newCtx);

    /**
     * @dev Callback before a new agreement is updated.
     * @param superToken The super token used for the agreement.
     * @param agreementClass The agreement class address.
     * @param agreementId The agreementId
     * @param agreementData The agreement data (non-compressed)
     * @param ctx The context data.
     * @return cbdata A free format in memory data the app can use to pass
     *          arbitary information to the after-hook callback.
     *
     * @custom:note 
     * - It will be invoked with `staticcall`, no state changes are permitted.
     * - Only revert with a "reason" is permitted.
     */
    function beforeAgreementUpdated(
        ISuperToken superToken,
        address agreementClass,
        bytes32 agreementId,
        bytes calldata agreementData,
        bytes calldata ctx
    )
        external
        view
        returns (bytes memory cbdata);


    /**
    * @dev Callback after a new agreement is updated.
    * @param superToken The super token used for the agreement.
    * @param agreementClass The agreement class address.
    * @param agreementId The agreementId
    * @param agreementData The agreement data (non-compressed)
    * @param cbdata The data returned from the before-hook callback.
    * @param ctx The context data.
    * @return newCtx The current context of the transaction.
    *
    * @custom:note 
    * - State changes is permitted.
    * - Only revert with a "reason" is permitted.
    */
    function afterAgreementUpdated(
        ISuperToken superToken,
        address agreementClass,
        bytes32 agreementId,
        bytes calldata agreementData,
        bytes calldata cbdata,
        bytes calldata ctx
    )
        external
        returns (bytes memory newCtx);

    /**
    * @dev Callback before a new agreement is terminated.
    * @param superToken The super token used for the agreement.
    * @param agreementClass The agreement class address.
    * @param agreementId The agreementId
    * @param agreementData The agreement data (non-compressed)
    * @param ctx The context data.
    * @return cbdata A free format in memory data the app can use to pass arbitary information to
    *         the after-hook callback.
    *
    * @custom:note 
    * - It will be invoked with `staticcall`, no state changes are permitted.
    * - Revert is not permitted.
    */
    function beforeAgreementTerminated(
        ISuperToken superToken,
        address agreementClass,
        bytes32 agreementId,
        bytes calldata agreementData,
        bytes calldata ctx
    )
        external
        view
        returns (bytes memory cbdata);

    /**
    * @dev Callback after a new agreement is terminated.
    * @param superToken The super token used for the agreement.
    * @param agreementClass The agreement class address.
    * @param agreementId The agreementId
    * @param agreementData The agreement data (non-compressed)
    * @param cbdata The data returned from the before-hook callback.
    * @param ctx The context data.
    * @return newCtx The current context of the transaction.
    *
    * @custom:note 
    * - State changes is permitted.
    * - Revert is not permitted.
    */
    function afterAgreementTerminated(
        ISuperToken superToken,
        address agreementClass,
        bytes32 agreementId,
        bytes calldata agreementData,
        bytes calldata cbdata,
        bytes calldata ctx
    )
        external
        returns (bytes memory newCtx);
}
          

// SPDX-License-Identifier: MIT
pragma solidity >= 0.8.11;

/**
 * @title Super app definitions library
 * @author Superfluid
 */
library SuperAppDefinitions {

    /**************************************************************************
    / App manifest config word
    /**************************************************************************/

    /*
     * App level is a way to allow the app to whitelist what other app it can
     * interact with (aka. composite app feature).
     *
     * For more details, refer to the technical paper of superfluid protocol.
     */
    uint256 constant internal APP_LEVEL_MASK = 0xFF;

    // The app is at the final level, hence it doesn't want to interact with any other app
    uint256 constant internal APP_LEVEL_FINAL = 1 << 0;

    // The app is at the second level, it may interact with other final level apps if whitelisted
    uint256 constant internal APP_LEVEL_SECOND = 1 << 1;

    function getAppCallbackLevel(uint256 configWord) internal pure returns (uint8) {
        return uint8(configWord & APP_LEVEL_MASK);
    }

    uint256 constant internal APP_JAIL_BIT = 1 << 15;
    function isAppJailed(uint256 configWord) internal pure returns (bool) {
        return (configWord & SuperAppDefinitions.APP_JAIL_BIT) > 0;
    }

    /**************************************************************************
    / Callback implementation bit masks
    /**************************************************************************/
    uint256 constant internal AGREEMENT_CALLBACK_NOOP_BITMASKS = 0xFF << 32;
    uint256 constant internal BEFORE_AGREEMENT_CREATED_NOOP = 1 << (32 + 0);
    uint256 constant internal AFTER_AGREEMENT_CREATED_NOOP = 1 << (32 + 1);
    uint256 constant internal BEFORE_AGREEMENT_UPDATED_NOOP = 1 << (32 + 2);
    uint256 constant internal AFTER_AGREEMENT_UPDATED_NOOP = 1 << (32 + 3);
    uint256 constant internal BEFORE_AGREEMENT_TERMINATED_NOOP = 1 << (32 + 4);
    uint256 constant internal AFTER_AGREEMENT_TERMINATED_NOOP = 1 << (32 + 5);

    /**************************************************************************
    / App Jail Reasons
    /**************************************************************************/

    uint256 constant internal APP_RULE_REGISTRATION_ONLY_IN_CONSTRUCTOR = 1;
    uint256 constant internal APP_RULE_NO_REGISTRATION_FOR_EOA = 2;
    uint256 constant internal APP_RULE_NO_REVERT_ON_TERMINATION_CALLBACK = 10;
    uint256 constant internal APP_RULE_NO_CRITICAL_SENDER_ACCOUNT = 11;
    uint256 constant internal APP_RULE_NO_CRITICAL_RECEIVER_ACCOUNT = 12;
    uint256 constant internal APP_RULE_CTX_IS_READONLY = 20;
    uint256 constant internal APP_RULE_CTX_IS_NOT_CLEAN = 21;
    uint256 constant internal APP_RULE_CTX_IS_MALFORMATED = 22;
    uint256 constant internal APP_RULE_COMPOSITE_APP_IS_NOT_WHITELISTED = 30;
    uint256 constant internal APP_RULE_COMPOSITE_APP_IS_JAILED = 31;
    uint256 constant internal APP_RULE_MAX_APP_LEVEL_REACHED = 40;

    // Validate configWord cleaness for future compatibility, or else may introduce undefined future behavior
    function isConfigWordClean(uint256 configWord) internal pure returns (bool) {
        return (configWord & ~(APP_LEVEL_MASK | APP_JAIL_BIT | AGREEMENT_CALLBACK_NOOP_BITMASKS)) == uint256(0);
    }
}

/**
 * @title Context definitions library
 * @author Superfluid
 */
library ContextDefinitions {

    /**************************************************************************
    / Call info
    /**************************************************************************/

    // app level
    uint256 constant internal CALL_INFO_APP_LEVEL_MASK = 0xFF;

    // call type
    uint256 constant internal CALL_INFO_CALL_TYPE_SHIFT = 32;
    uint256 constant internal CALL_INFO_CALL_TYPE_MASK = 0xF << CALL_INFO_CALL_TYPE_SHIFT;
    uint8 constant internal CALL_INFO_CALL_TYPE_AGREEMENT = 1;
    uint8 constant internal CALL_INFO_CALL_TYPE_APP_ACTION = 2;
    uint8 constant internal CALL_INFO_CALL_TYPE_APP_CALLBACK = 3;

    function decodeCallInfo(uint256 callInfo)
        internal pure
        returns (uint8 appCallbackLevel, uint8 callType)
    {
        appCallbackLevel = uint8(callInfo & CALL_INFO_APP_LEVEL_MASK);
        callType = uint8((callInfo & CALL_INFO_CALL_TYPE_MASK) >> CALL_INFO_CALL_TYPE_SHIFT);
    }

    function encodeCallInfo(uint8 appCallbackLevel, uint8 callType)
        internal pure
        returns (uint256 callInfo)
    {
        return uint256(appCallbackLevel) | (uint256(callType) << CALL_INFO_CALL_TYPE_SHIFT);
    }

}

/**
 * @title Flow Operator definitions library
  * @author Superfluid
 */
library FlowOperatorDefinitions {
   uint8 constant internal AUTHORIZE_FLOW_OPERATOR_CREATE = uint8(1) << 0;
   uint8 constant internal AUTHORIZE_FLOW_OPERATOR_UPDATE = uint8(1) << 1;
   uint8 constant internal AUTHORIZE_FLOW_OPERATOR_DELETE = uint8(1) << 2;
   uint8 constant internal AUTHORIZE_FULL_CONTROL =
       AUTHORIZE_FLOW_OPERATOR_CREATE | AUTHORIZE_FLOW_OPERATOR_UPDATE | AUTHORIZE_FLOW_OPERATOR_DELETE;
   uint8 constant internal REVOKE_FLOW_OPERATOR_CREATE = ~(uint8(1) << 0);
   uint8 constant internal REVOKE_FLOW_OPERATOR_UPDATE = ~(uint8(1) << 1);
   uint8 constant internal REVOKE_FLOW_OPERATOR_DELETE = ~(uint8(1) << 2);

   function isPermissionsClean(uint8 permissions) internal pure returns (bool) {
       return (
           permissions & ~(AUTHORIZE_FLOW_OPERATOR_CREATE
               | AUTHORIZE_FLOW_OPERATOR_UPDATE
               | AUTHORIZE_FLOW_OPERATOR_DELETE)
           ) == uint8(0);
   }
}

/**
 * @title Batch operation library
 * @author Superfluid
 */
library BatchOperation {
    /**
     * @dev ERC20.approve batch operation type
     *
     * Call spec:
     * ISuperToken(target).operationApprove(
     *     abi.decode(data, (address spender, uint256 amount))
     * )
     */
    uint32 constant internal OPERATION_TYPE_ERC20_APPROVE = 1;
    /**
     * @dev ERC20.transferFrom batch operation type
     *
     * Call spec:
     * ISuperToken(target).operationTransferFrom(
     *     abi.decode(data, (address sender, address recipient, uint256 amount)
     * )
     */
    uint32 constant internal OPERATION_TYPE_ERC20_TRANSFER_FROM = 2;
    /**
     * @dev ERC777.send batch operation type
     *
     * Call spec:
     * ISuperToken(target).operationSend(
     *     abi.decode(data, (address recipient, uint256 amount, bytes userData)
     * )
     */
    uint32 constant internal OPERATION_TYPE_ERC777_SEND = 3;
    /**
     * @dev ERC20.increaseAllowance batch operation type
     *
     * Call spec:
     * ISuperToken(target).operationIncreaseAllowance(
     *     abi.decode(data, (address account, address spender, uint256 addedValue))
     * )
     */
    uint32 constant internal OPERATION_TYPE_ERC20_INCREASE_ALLOWANCE = 4;
    /**
     * @dev ERC20.decreaseAllowance batch operation type
     *
     * Call spec:
     * ISuperToken(target).operationDecreaseAllowance(
     *     abi.decode(data, (address account, address spender, uint256 subtractedValue))
     * )
     */
    uint32 constant internal OPERATION_TYPE_ERC20_DECREASE_ALLOWANCE = 5;
    /**
     * @dev SuperToken.upgrade batch operation type
     *
     * Call spec:
     * ISuperToken(target).operationUpgrade(
     *     abi.decode(data, (uint256 amount)
     * )
     */
    uint32 constant internal OPERATION_TYPE_SUPERTOKEN_UPGRADE = 1 + 100;
    /**
     * @dev SuperToken.downgrade batch operation type
     *
     * Call spec:
     * ISuperToken(target).operationDowngrade(
     *     abi.decode(data, (uint256 amount)
     * )
     */
    uint32 constant internal OPERATION_TYPE_SUPERTOKEN_DOWNGRADE = 2 + 100;
    /**
     * @dev Superfluid.callAgreement batch operation type
     *
     * Call spec:
     * callAgreement(
     *     ISuperAgreement(target)),
     *     abi.decode(data, (bytes callData, bytes userData)
     * )
     */
    uint32 constant internal OPERATION_TYPE_SUPERFLUID_CALL_AGREEMENT = 1 + 200;
    /**
     * @dev Superfluid.callAppAction batch operation type
     *
     * Call spec:
     * callAppAction(
     *     ISuperApp(target)),
     *     data
     * )
     */
    uint32 constant internal OPERATION_TYPE_SUPERFLUID_CALL_APP_ACTION = 2 + 200;
}

/**
 * @title Superfluid governance configs library
 * @author Superfluid
 */
library SuperfluidGovernanceConfigs {

    bytes32 constant internal SUPERFLUID_REWARD_ADDRESS_CONFIG_KEY =
        keccak256("org.superfluid-finance.superfluid.rewardAddress");
    bytes32 constant internal CFAV1_PPP_CONFIG_KEY =
        keccak256("org.superfluid-finance.agreements.ConstantFlowAgreement.v1.PPPConfiguration");
    bytes32 constant internal SUPERTOKEN_MINIMUM_DEPOSIT_KEY =
        keccak256("org.superfluid-finance.superfluid.superTokenMinimumDeposit");

    function getTrustedForwarderConfigKey(address forwarder) internal pure returns (bytes32) {
        return keccak256(abi.encode(
            "org.superfluid-finance.superfluid.trustedForwarder",
            forwarder));
    }

    function getAppRegistrationConfigKey(address deployer, string memory registrationKey) internal pure
        returns (bytes32)
    {
        return keccak256(abi.encode(
            "org.superfluid-finance.superfluid.appWhiteListing.registrationKey",
            deployer,
            registrationKey));
    }

    function getAppFactoryConfigKey(address factory) internal pure returns (bytes32)
    {
        return keccak256(abi.encode(
            "org.superfluid-finance.superfluid.appWhiteListing.factory",
            factory));
    }

    function decodePPPConfig(uint256 pppConfig) internal pure
        returns (uint256 liquidationPeriod, uint256 patricianPeriod)
    {
        liquidationPeriod = (pppConfig >> 32) & type(uint32).max;
        patricianPeriod = pppConfig & type(uint32).max;
    }
}
          

// SPDX-License-Identifier: MIT
pragma solidity >= 0.8.11;

import { ISuperfluidToken } from "./ISuperfluidToken.sol";
import { TokenInfo } from "../tokens/TokenInfo.sol";
import { IERC777 } from "@openzeppelin/contracts/token/ERC777/IERC777.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { IConstantOutflowNFT } from "./IConstantOutflowNFT.sol";
import { IConstantInflowNFT } from "./IConstantInflowNFT.sol";

/**
 * @title Super token (Superfluid Token + ERC20 + ERC777) interface
 * @author Superfluid
 */
interface ISuperToken is ISuperfluidToken, TokenInfo, IERC20, IERC777 {

    /**************************************************************************
     * Errors
     *************************************************************************/
    error SUPER_TOKEN_CALLER_IS_NOT_OPERATOR_FOR_HOLDER();       // 0xf7f02227
    error SUPER_TOKEN_NOT_ERC777_TOKENS_RECIPIENT();             // 0xfe737d05
    error SUPER_TOKEN_INFLATIONARY_DEFLATIONARY_NOT_SUPPORTED(); // 0xe3e13698
    error SUPER_TOKEN_NO_UNDERLYING_TOKEN();                     // 0xf79cf656
    error SUPER_TOKEN_ONLY_SELF();                               // 0x7ffa6648
    error SUPER_TOKEN_ONLY_HOST();                               // 0x98f73704
    error SUPER_TOKEN_ONLY_GOV_OWNER();                          // 0xd9c7ed08
    error SUPER_TOKEN_APPROVE_FROM_ZERO_ADDRESS();               // 0x81638627
    error SUPER_TOKEN_APPROVE_TO_ZERO_ADDRESS();                 // 0xdf070274
    error SUPER_TOKEN_BURN_FROM_ZERO_ADDRESS();                  // 0xba2ab184
    error SUPER_TOKEN_MINT_TO_ZERO_ADDRESS();                    // 0x0d243157
    error SUPER_TOKEN_TRANSFER_FROM_ZERO_ADDRESS();              // 0xeecd6c9b
    error SUPER_TOKEN_TRANSFER_TO_ZERO_ADDRESS();                // 0xe219bd39
    error SUPER_TOKEN_NFT_PROXY_ADDRESS_CHANGED();               // 0x6bef249d

    /**
     * @dev Initialize the contract
     */
    function initialize(
        IERC20 underlyingToken,
        uint8 underlyingDecimals,
        string calldata n,
        string calldata s
    ) external;

    /**************************************************************************
    * Immutable variables
    *************************************************************************/

    // solhint-disable-next-line func-name-mixedcase
    function CONSTANT_OUTFLOW_NFT() external view returns (IConstantOutflowNFT);
    // solhint-disable-next-line func-name-mixedcase
    function CONSTANT_INFLOW_NFT() external view returns (IConstantInflowNFT);

    /**************************************************************************
    * TokenInfo & ERC777
    *************************************************************************/

    /**
     * @dev Returns the name of the token.
     */
    function name() external view override(IERC777, TokenInfo) returns (string memory);

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() external view override(IERC777, TokenInfo) returns (string memory);

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * @custom:note SuperToken always uses 18 decimals.
     *
     * This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() external view override(TokenInfo) returns (uint8);

    /**************************************************************************
    * ERC20 & ERC777
    *************************************************************************/

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() external view override(IERC777, IERC20) returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by an account (`owner`).
     */
    function balanceOf(address account) external view override(IERC777, IERC20) returns(uint256 balance);

    /**************************************************************************
    * ERC20
    *************************************************************************/

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * @return Returns Success a boolean value indicating whether the operation succeeded.
     *
     * @custom:emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external override(IERC20) returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     *         allowed to spend on behalf of `owner` through {transferFrom}. This is
     *         zero by default.
     *
     * @notice This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external override(IERC20) view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * @return Returns Success a boolean value indicating whether the operation succeeded.
     *
     * @custom:note Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * @custom:emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external override(IERC20) returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     *         allowance mechanism. `amount` is then deducted from the caller's
     *         allowance.
     *
     * @return Returns Success a boolean value indicating whether the operation succeeded.
     *
     * @custom:emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external override(IERC20) returns (bool);

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * @custom:emits an {Approval} event indicating the updated allowance.
     *
     * @custom:requirements
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) external returns (bool);

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * @custom:emits an {Approval} event indicating the updated allowance.
     *
     * @custom:requirements
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
     function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool);

    /**************************************************************************
    * ERC777
    *************************************************************************/

    /**
     * @dev Returns the smallest part of the token that is not divisible. This
     *         means all token operations (creation, movement and destruction) must have
     *         amounts that are a multiple of this number.
     *
     * @custom:note For super token contracts, this value is always 1
     */
    function granularity() external view override(IERC777) returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * @dev If send or receive hooks are registered for the caller and `recipient`,
     *      the corresponding functions will be called with `userData` and empty
     *      `operatorData`. See {IERC777Sender} and {IERC777Recipient}.
     *
     * @custom:emits a {Sent} event.
     *
     * @custom:requirements
     * - the caller must have at least `amount` tokens.
     * - `recipient` cannot be the zero address.
     * - if `recipient` is a contract, it must implement the {IERC777Recipient}
     * interface.
     */
    function send(address recipient, uint256 amount, bytes calldata userData) external override(IERC777);

    /**
     * @dev Destroys `amount` tokens from the caller's account, reducing the
     * total supply and transfers the underlying token to the caller's account.
     *
     * If a send hook is registered for the caller, the corresponding function
     * will be called with `userData` and empty `operatorData`. See {IERC777Sender}.
     *
     * @custom:emits a {Burned} event.
     *
     * @custom:requirements
     * - the caller must have at least `amount` tokens.
     */
    function burn(uint256 amount, bytes calldata userData) external override(IERC777);

    /**
     * @dev Returns true if an account is an operator of `tokenHolder`.
     * Operators can send and burn tokens on behalf of their owners. All
     * accounts are their own operator.
     *
     * See {operatorSend} and {operatorBurn}.
     */
    function isOperatorFor(address operator, address tokenHolder) external override(IERC777) view returns (bool);

    /**
     * @dev Make an account an operator of the caller.
     *
     * See {isOperatorFor}.
     *
     * @custom:emits an {AuthorizedOperator} event.
     *
     * @custom:requirements
     * - `operator` cannot be calling address.
     */
    function authorizeOperator(address operator) external override(IERC777);

    /**
     * @dev Revoke an account's operator status for the caller.
     *
     * See {isOperatorFor} and {defaultOperators}.
     *
     * @custom:emits a {RevokedOperator} event.
     *
     * @custom:requirements
     * - `operator` cannot be calling address.
     */
    function revokeOperator(address operator) external override(IERC777);

    /**
     * @dev Returns the list of default operators. These accounts are operators
     * for all token holders, even if {authorizeOperator} was never called on
     * them.
     *
     * This list is immutable, but individual holders may revoke these via
     * {revokeOperator}, in which case {isOperatorFor} will return false.
     */
    function defaultOperators() external override(IERC777) view returns (address[] memory);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient`. The caller must
     * be an operator of `sender`.
     *
     * If send or receive hooks are registered for `sender` and `recipient`,
     * the corresponding functions will be called with `userData` and
     * `operatorData`. See {IERC777Sender} and {IERC777Recipient}.
     *
     * @custom:emits a {Sent} event.
     *
     * @custom:requirements
     * - `sender` cannot be the zero address.
     * - `sender` must have at least `amount` tokens.
     * - the caller must be an operator for `sender`.
     * - `recipient` cannot be the zero address.
     * - if `recipient` is a contract, it must implement the {IERC777Recipient}
     * interface.
     */
    function operatorSend(
        address sender,
        address recipient,
        uint256 amount,
        bytes calldata userData,
        bytes calldata operatorData
    ) external override(IERC777);

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the total supply.
     * The caller must be an operator of `account`.
     *
     * If a send hook is registered for `account`, the corresponding function
     * will be called with `userData` and `operatorData`. See {IERC777Sender}.
     *
     * @custom:emits a {Burned} event.
     *
     * @custom:requirements
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     * - the caller must be an operator for `account`.
     */
    function operatorBurn(
        address account,
        uint256 amount,
        bytes calldata userData,
        bytes calldata operatorData
    ) external override(IERC777);

    /**************************************************************************
     * SuperToken custom token functions
     *************************************************************************/

    /**
     * @dev Mint new tokens for the account
     * If `userData` is not empty, the `tokensReceived` hook is invoked according to ERC777 semantics.
     *
     * @custom:modifiers
     *  - onlySelf
     */
    function selfMint(
        address account,
        uint256 amount,
        bytes memory userData
    ) external;

   /**
    * @dev Burn existing tokens for the account
    * If `userData` is not empty, the `tokensToSend` hook is invoked according to ERC777 semantics.
    *
    * @custom:modifiers
    *  - onlySelf
    */
   function selfBurn(
       address account,
       uint256 amount,
       bytes memory userData
   ) external;

   /**
    * @dev Transfer `amount` tokens from the `sender` to `recipient`.
    * If `spender` isn't the same as `sender`, checks if `spender` has allowance to
    * spend tokens of `sender`.
    *
    * @custom:modifiers
    *  - onlySelf
    */
   function selfTransferFrom(
        address sender,
        address spender,
        address recipient,
        uint256 amount
   ) external;

   /**
    * @dev Give `spender`, `amount` allowance to spend the tokens of
    * `account`.
    *
    * @custom:modifiers
    *  - onlySelf
    */
   function selfApproveFor(
        address account,
        address spender,
        uint256 amount
   ) external;

    /**************************************************************************
     * SuperToken extra functions
     *************************************************************************/

    /**
     * @dev Transfer all available balance from `msg.sender` to `recipient`
     */
    function transferAll(address recipient) external;

    /**************************************************************************
     * ERC20 wrapping
     *************************************************************************/

    /**
     * @dev Return the underlying token contract
     * @return tokenAddr Underlying token address
     */
    function getUnderlyingToken() external view returns(address tokenAddr);

    /**
     * @dev Upgrade ERC20 to SuperToken.
     * @param amount Number of tokens to be upgraded (in 18 decimals)
     *
     * @custom:note It will use `transferFrom` to get tokens. Before calling this
     * function you should `approve` this contract
     */
    function upgrade(uint256 amount) external;

    /**
     * @dev Upgrade ERC20 to SuperToken and transfer immediately
     * @param to The account to receive upgraded tokens
     * @param amount Number of tokens to be upgraded (in 18 decimals)
     * @param userData User data for the TokensRecipient callback
     *
     * @custom:note It will use `transferFrom` to get tokens. Before calling this
     * function you should `approve` this contract
     *
     * @custom:warning
     * - there is potential of reentrancy IF the "to" account is a registered ERC777 recipient.
     * @custom:requirements
     * - if `userData` is NOT empty AND `to` is a contract, it MUST be a registered ERC777 recipient
     *   otherwise it reverts.
     */
    function upgradeTo(address to, uint256 amount, bytes calldata userData) external;

    /**
     * @dev Token upgrade event
     * @param account Account where tokens are upgraded to
     * @param amount Amount of tokens upgraded (in 18 decimals)
     */
    event TokenUpgraded(
        address indexed account,
        uint256 amount
    );

    /**
     * @dev Downgrade SuperToken to ERC20.
     * @dev It will call transfer to send tokens
     * @param amount Number of tokens to be downgraded
     */
    function downgrade(uint256 amount) external;

    /**
     * @dev Downgrade SuperToken to ERC20 and transfer immediately
     * @param to The account to receive downgraded tokens
     * @param amount Number of tokens to be downgraded (in 18 decimals)
     */
    function downgradeTo(address to, uint256 amount) external;

    /**
     * @dev Token downgrade event
     * @param account Account whose tokens are downgraded
     * @param amount Amount of tokens downgraded
     */
    event TokenDowngraded(
        address indexed account,
        uint256 amount
    );

    /**************************************************************************
    * Batch Operations
    *************************************************************************/

    /**
    * @dev Perform ERC20 approve by host contract.
    * @param account The account owner to be approved.
    * @param spender The spender of account owner's funds.
    * @param amount Number of tokens to be approved.
    *
    * @custom:modifiers
    *  - onlyHost
    */
    function operationApprove(
        address account,
        address spender,
        uint256 amount
    ) external;

    function operationIncreaseAllowance(
        address account,
        address spender,
        uint256 addedValue
    ) external;

    function operationDecreaseAllowance(
        address account,
        address spender,
        uint256 subtractedValue
    ) external;

    /**
    * @dev Perform ERC20 transferFrom by host contract.
    * @param account The account to spend sender's funds.
    * @param spender The account where the funds is sent from.
    * @param recipient The recipient of the funds.
    * @param amount Number of tokens to be transferred.
    *
    * @custom:modifiers
    *  - onlyHost
    */
    function operationTransferFrom(
        address account,
        address spender,
        address recipient,
        uint256 amount
    ) external;

    /**
    * @dev Perform ERC777 send by host contract.
    * @param spender The account where the funds is sent from.
    * @param recipient The recipient of the funds.
    * @param amount Number of tokens to be transferred.
    * @param userData Arbitrary user inputted data
    *
    * @custom:modifiers
    *  - onlyHost
    */
    function operationSend(
        address spender,
        address recipient,
        uint256 amount,
        bytes memory userData
    ) external;

    /**
    * @dev Upgrade ERC20 to SuperToken by host contract.
    * @param account The account to be changed.
    * @param amount Number of tokens to be upgraded (in 18 decimals)
    *
    * @custom:modifiers
    *  - onlyHost
    */
    function operationUpgrade(address account, uint256 amount) external;

    /**
    * @dev Downgrade ERC20 to SuperToken by host contract.
    * @param account The account to be changed.
    * @param amount Number of tokens to be downgraded (in 18 decimals)
    *
    * @custom:modifiers
    *  - onlyHost
    */
    function operationDowngrade(address account, uint256 amount) external;

    // Flow NFT events
    /**
     * @dev Constant Outflow NFT proxy created event
     * @param constantOutflowNFT constant outflow nft address
     */
    event ConstantOutflowNFTCreated(
        IConstantOutflowNFT indexed constantOutflowNFT
    );

    /**
     * @dev Constant Inflow NFT proxy created event
     * @param constantInflowNFT constant inflow nft address
     */
    event ConstantInflowNFTCreated(
        IConstantInflowNFT indexed constantInflowNFT
    );

    /**************************************************************************
    * Function modifiers for access control and parameter validations
    *
    * While they cannot be explicitly stated in function definitions, they are
    * listed in function definition comments instead for clarity.
    *
    * NOTE: solidity-coverage not supporting it
    *************************************************************************/

    /// @dev The msg.sender must be the contract itself
    //modifier onlySelf() virtual

}
          

// SPDX-License-Identifier: MIT
pragma solidity >= 0.8.11;

// ISuperfluid.sol can also be used as an umbrella-import for everything Superfluid, hence we should have these unused
// import.
//
// solhint-disable no-unused-import

/// Global definitions
import {
    SuperAppDefinitions,
    ContextDefinitions,
    FlowOperatorDefinitions,
    BatchOperation,
    SuperfluidGovernanceConfigs
} from "./Definitions.sol";
/// Super token related interfaces:
/// Note: CustomSuperTokenBase is not included for people building CustomSuperToken.
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { IERC777 } from "@openzeppelin/contracts/token/ERC777/IERC777.sol";
import { TokenInfo, ERC20WithTokenInfo } from "../tokens/ERC20WithTokenInfo.sol";
import { ISuperfluidToken } from "./ISuperfluidToken.sol";
import { ISuperToken } from "./ISuperToken.sol";
import { ISuperTokenFactory } from "./ISuperTokenFactory.sol";
import { ISETH } from "../tokens/ISETH.sol";
/// Superfluid/ERC20x NFTs
import { IFlowNFTBase } from "./IFlowNFTBase.sol";
import { IConstantOutflowNFT } from "./IConstantOutflowNFT.sol";
import { IConstantInflowNFT } from "./IConstantInflowNFT.sol";
import { IPoolAdminNFT } from "./IPoolAdminNFT.sol";
import { IPoolMemberNFT } from "./IPoolMemberNFT.sol";
/// Superfluid agreement interfaces:
import { ISuperAgreement } from "./ISuperAgreement.sol";
import { IConstantFlowAgreementV1 } from "../agreements/IConstantFlowAgreementV1.sol";
import { IInstantDistributionAgreementV1 } from "../agreements/IInstantDistributionAgreementV1.sol";
/// Superfluid App interfaces:
import { ISuperApp } from "./ISuperApp.sol";
/// Superfluid governance
import { ISuperfluidGovernance } from "./ISuperfluidGovernance.sol";

/**
 * @title Host interface
 * @author Superfluid
 * @notice This is the central contract of the system where super agreement, super app
 * and super token features are connected.
 *
 * The Superfluid host contract is also the entry point for the protocol users,
 * where batch call and meta transaction are provided for UX improvements.
 *
 */
interface ISuperfluid {

    /**************************************************************************
     * Errors
     *************************************************************************/
    // Superfluid Custom Errors
    error HOST_AGREEMENT_CALLBACK_IS_NOT_ACTION();              // 0xef4295f6
    error HOST_CANNOT_DOWNGRADE_TO_NON_UPGRADEABLE();           // 0x474e7641
    error HOST_CALL_AGREEMENT_WITH_CTX_FROM_WRONG_ADDRESS();    // 0x0cd0ebc2
    error HOST_CALL_APP_ACTION_WITH_CTX_FROM_WRONG_ADDRESS();   // 0x473f7bd4
    error HOST_INVALID_CONFIG_WORD();                           // 0xf4c802a4
    error HOST_MAX_256_AGREEMENTS();                            // 0x7c281a78
    error HOST_NON_UPGRADEABLE();                               // 0x14f72c9f
    error HOST_NON_ZERO_LENGTH_PLACEHOLDER_CTX();               // 0x67e9985b
    error HOST_ONLY_GOVERNANCE();                               // 0xc5d22a4e
    error HOST_UNKNOWN_BATCH_CALL_OPERATION_TYPE();             // 0xb4770115
    error HOST_AGREEMENT_ALREADY_REGISTERED();                  // 0xdc9ddba8
    error HOST_AGREEMENT_IS_NOT_REGISTERED();                   // 0x1c9e9bea
    error HOST_MUST_BE_CONTRACT();                              // 0xd4f6b30c
    error HOST_ONLY_LISTED_AGREEMENT();                         // 0x619c5359
    error HOST_NEED_MORE_GAS();                                 // 0xd4f5d496

    // App Related Custom Errors
    // uses SuperAppDefinitions' App Jail Reasons as _code
    error APP_RULE(uint256 _code);                              // 0xa85ba64f

    error HOST_INVALID_OR_EXPIRED_SUPER_APP_REGISTRATION_KEY(); // 0x19ab84d1
    error HOST_NOT_A_SUPER_APP();                               // 0x163cbe43
    error HOST_NO_APP_REGISTRATION_PERMISSIONS();               // 0x5b93ebf0
    error HOST_RECEIVER_IS_NOT_SUPER_APP();                     // 0x96aa315e
    error HOST_SENDER_IS_NOT_SUPER_APP();                       // 0xbacfdc40
    error HOST_SOURCE_APP_NEEDS_HIGHER_APP_LEVEL();             // 0x44725270
    error HOST_SUPER_APP_IS_JAILED();                           // 0x02384b64
    error HOST_SUPER_APP_ALREADY_REGISTERED();                  // 0x01b0a935
    error HOST_UNAUTHORIZED_SUPER_APP_FACTORY();                // 0x289533c5

    /**************************************************************************
     * Time
     *
     * > The Oracle: You have the sight now, Neo. You are looking at the world without time.
     * > Neo: Then why can't I see what happens to her?
     * > The Oracle: We can never see past the choices we don't understand.
     * >       - The Oracle and Neo conversing about the future of Trinity and the effects of Neo's choices
     *************************************************************************/

    function getNow() external view returns (uint256);

    /**************************************************************************
     * Governance
     *************************************************************************/

    /**
     * @dev Get the current governance address of the Superfluid host
     */
    function getGovernance() external view returns(ISuperfluidGovernance governance);

    /**
     * @dev Replace the current governance with a new one
     */
    function replaceGovernance(ISuperfluidGovernance newGov) external;
    /**
     * @dev Governance replaced event
     * @param oldGov Address of the old governance contract
     * @param newGov Address of the new governance contract
     */
    event GovernanceReplaced(ISuperfluidGovernance oldGov, ISuperfluidGovernance newGov);

    /**************************************************************************
     * Agreement Whitelisting
     *************************************************************************/

    /**
     * @dev Register a new agreement class to the system
     * @param agreementClassLogic Initial agreement class code
     *
     * @custom:modifiers
     * - onlyGovernance
     */
    function registerAgreementClass(ISuperAgreement agreementClassLogic) external;
    /**
     * @notice Agreement class registered event
     * @dev agreementType is the keccak256 hash of: "org.superfluid-finance.agreements.<AGREEMENT_NAME>.<VERSION>"
     * @param agreementType The agreement type registered
     * @param code Address of the new agreement
     */
    event AgreementClassRegistered(bytes32 agreementType, address code);

    /**
    * @dev Update code of an agreement class
    * @param agreementClassLogic New code for the agreement class
    *
    * @custom:modifiers
    *  - onlyGovernance
    */
    function updateAgreementClass(ISuperAgreement agreementClassLogic) external;
    /**
     * @notice Agreement class updated event
     * @dev agreementType is the keccak256 hash of: "org.superfluid-finance.agreements.<AGREEMENT_NAME>.<VERSION>"
     * @param agreementType The agreement type updated
     * @param code Address of the new agreement
     */
    event AgreementClassUpdated(bytes32 agreementType, address code);

    /**
    * @notice Check if the agreement type is whitelisted
    * @dev agreementType is the keccak256 hash of: "org.superfluid-finance.agreements.<AGREEMENT_NAME>.<VERSION>"
    */
    function isAgreementTypeListed(bytes32 agreementType) external view returns(bool yes);

    /**
    * @dev Check if the agreement class is whitelisted
    */
    function isAgreementClassListed(ISuperAgreement agreementClass) external view returns(bool yes);

    /**
    * @notice Get agreement class
    * @dev agreementType is the keccak256 hash of: "org.superfluid-finance.agreements.<AGREEMENT_NAME>.<VERSION>"
    */
    function getAgreementClass(bytes32 agreementType) external view returns(ISuperAgreement agreementClass);

    /**
    * @dev Map list of the agreement classes using a bitmap
    * @param bitmap Agreement class bitmap
    */
    function mapAgreementClasses(uint256 bitmap)
        external view
        returns (ISuperAgreement[] memory agreementClasses);

    /**
    * @notice Create a new bitmask by adding a agreement class to it
    * @dev agreementType is the keccak256 hash of: "org.superfluid-finance.agreements.<AGREEMENT_NAME>.<VERSION>"
    * @param bitmap Agreement class bitmap
    */
    function addToAgreementClassesBitmap(uint256 bitmap, bytes32 agreementType)
        external view
        returns (uint256 newBitmap);

    /**
    * @notice Create a new bitmask by removing a agreement class from it
    * @dev agreementType is the keccak256 hash of: "org.superfluid-finance.agreements.<AGREEMENT_NAME>.<VERSION>"
    * @param bitmap Agreement class bitmap
    */
    function removeFromAgreementClassesBitmap(uint256 bitmap, bytes32 agreementType)
        external view
        returns (uint256 newBitmap);

    /**************************************************************************
    * Super Token Factory
    **************************************************************************/

    /**
     * @dev Get the super token factory
     * @return factory The factory
     */
    function getSuperTokenFactory() external view returns (ISuperTokenFactory factory);

    /**
     * @dev Get the super token factory logic (applicable to upgradable deployment)
     * @return logic The factory logic
     */
    function getSuperTokenFactoryLogic() external view returns (address logic);

    /**
     * @dev Update super token factory
     * @param newFactory New factory logic
     */
    function updateSuperTokenFactory(ISuperTokenFactory newFactory) external;
    /**
     * @dev SuperToken factory updated event
     * @param newFactory Address of the new factory
     */
    event SuperTokenFactoryUpdated(ISuperTokenFactory newFactory);

    /**
     * @notice Update the super token logic to the latest (canonical) implementation
     * if `newLogicOverride` is zero, or to `newLogicOverride` otherwise.
     * or to the provided implementation `.
     * @dev Refer to ISuperTokenFactory.Upgradability for expected behaviours
     */
    function updateSuperTokenLogic(ISuperToken token, address newLogicOverride) external;
    /**
     * @notice Update the super token logic to the provided one
     * @dev newLogic must implement UUPSProxiable with matching proxiableUUID
     */
    event SuperTokenLogicUpdated(ISuperToken indexed token, address code);

    /**************************************************************************
     * App Registry
     *************************************************************************/

    /**
     * @dev Message sender (must be a contract) declares itself as a super app.
     * @custom:deprecated you should use `registerAppWithKey` or `registerAppByFactory` instead,
     * because app registration is currently governance permissioned on mainnets.
     * @param configWord The super app manifest configuration, flags are defined in
     * `SuperAppDefinitions`
     */
    function registerApp(uint256 configWord) external;
    /**
     * @dev App registered event
     * @param app Address of jailed app
     */
    event AppRegistered(ISuperApp indexed app);

    /**
     * @dev Message sender declares itself as a super app.
     * @param configWord The super app manifest configuration, flags are defined in `SuperAppDefinitions`
     * @param registrationKey The registration key issued by the governance, needed to register on a mainnet.
     * @notice See https://github.com/superfluid-finance/protocol-monorepo/wiki/Super-App-White-listing-Guide
     * On testnets or in dev environment, a placeholder (e.g. empty string) can be used.
     * While the message sender must be the super app itself, the transaction sender (tx.origin)
     * must be the deployer account the registration key was issued for.
     */
    function registerAppWithKey(uint256 configWord, string calldata registrationKey) external;

    /**
     * @dev Message sender (must be a contract) declares app as a super app
     * @param configWord The super app manifest configuration, flags are defined in `SuperAppDefinitions`
     * @notice On mainnet deployments, only factory contracts pre-authorized by governance can use this.
     * See https://github.com/superfluid-finance/protocol-monorepo/wiki/Super-App-White-listing-Guide
     */
    function registerAppByFactory(ISuperApp app, uint256 configWord) external;

    /**
     * @dev Query if the app is registered
     * @param app Super app address
     */
    function isApp(ISuperApp app) external view returns(bool);

    /**
     * @dev Query app callbacklevel
     * @param app Super app address
     */
    function getAppCallbackLevel(ISuperApp app) external view returns(uint8 appCallbackLevel);

    /**
     * @dev Get the manifest of the super app
     * @param app Super app address
     */
    function getAppManifest(
        ISuperApp app
    )
        external view
        returns (
            bool isSuperApp,
            bool isJailed,
            uint256 noopMask
        );

    /**
     * @dev Query if the app has been jailed
     * @param app Super app address
     */
    function isAppJailed(ISuperApp app) external view returns (bool isJail);

    /**
     * @dev Whitelist the target app for app composition for the source app (msg.sender)
     * @param targetApp The target super app address
     */
    function allowCompositeApp(ISuperApp targetApp) external;

    /**
     * @dev Query if source app is allowed to call the target app as downstream app
     * @param app Super app address
     * @param targetApp The target super app address
     */
    function isCompositeAppAllowed(
        ISuperApp app,
        ISuperApp targetApp
    )
        external view
        returns (bool isAppAllowed);

    /**************************************************************************
     * Agreement Framework
     *
     * Agreements use these function to trigger super app callbacks, updates
     * app credit and charge gas fees.
     *
     * These functions can only be called by registered agreements.
     *************************************************************************/

    /**
     * @dev (For agreements) StaticCall the app before callback
     * @param  app               The super app.
     * @param  callData          The call data sending to the super app.
     * @param  isTermination     Is it a termination callback?
     * @param  ctx               Current ctx, it will be validated.
     * @return cbdata            Data returned from the callback.
     */
    function callAppBeforeCallback(
        ISuperApp app,
        bytes calldata callData,
        bool isTermination,
        bytes calldata ctx
    )
        external
        // onlyAgreement
        // assertValidCtx(ctx)
        returns(bytes memory cbdata);

    /**
     * @dev (For agreements) Call the app after callback
     * @param  app               The super app.
     * @param  callData          The call data sending to the super app.
     * @param  isTermination     Is it a termination callback?
     * @param  ctx               Current ctx, it will be validated.
     * @return newCtx            The current context of the transaction.
     */
    function callAppAfterCallback(
        ISuperApp app,
        bytes calldata callData,
        bool isTermination,
        bytes calldata ctx
    )
        external
        // onlyAgreement
        // assertValidCtx(ctx)
        returns(bytes memory newCtx);

    /**
     * @dev (For agreements) Create a new callback stack
     * @param  ctx                     The current ctx, it will be validated.
     * @param  app                     The super app.
     * @param  appCreditGranted        App credit granted so far.
     * @param  appCreditUsed           App credit used so far.
     * @return newCtx                  The current context of the transaction.
     */
    function appCallbackPush(
        bytes calldata ctx,
        ISuperApp app,
        uint256 appCreditGranted,
        int256 appCreditUsed,
        ISuperfluidToken appCreditToken
    )
        external
        // onlyAgreement
        // assertValidCtx(ctx)
        returns (bytes memory newCtx);

    /**
     * @dev (For agreements) Pop from the current app callback stack
     * @param  ctx                     The ctx that was pushed before the callback stack.
     * @param  appCreditUsedDelta      App credit used by the app.
     * @return newCtx                  The current context of the transaction.
     *
     * @custom:security
     * - Here we cannot do assertValidCtx(ctx), since we do not really save the stack in memory.
     * - Hence there is still implicit trust that the agreement handles the callback push/pop pair correctly.
     */
    function appCallbackPop(
        bytes calldata ctx,
        int256 appCreditUsedDelta
    )
        external
        // onlyAgreement
        returns (bytes memory newCtx);

    /**
     * @dev (For agreements) Use app credit.
     * @param  ctx                      The current ctx, it will be validated.
     * @param  appCreditUsedMore        See app credit for more details.
     * @return newCtx                   The current context of the transaction.
     */
    function ctxUseCredit(
        bytes calldata ctx,
        int256 appCreditUsedMore
    )
        external
        // onlyAgreement
        // assertValidCtx(ctx)
        returns (bytes memory newCtx);

    /**
     * @dev (For agreements) Jail the app.
     * @param  app                     The super app.
     * @param  reason                  Jail reason code.
     * @return newCtx                  The current context of the transaction.
     */
    function jailApp(
        bytes calldata ctx,
        ISuperApp app,
        uint256 reason
    )
        external
        // onlyAgreement
        // assertValidCtx(ctx)
        returns (bytes memory newCtx);

    /**
     * @dev Jail event for the app
     * @param app Address of jailed app
     * @param reason Reason the app is jailed (see Definitions.sol for the full list)
     */
    event Jail(ISuperApp indexed app, uint256 reason);

    /**************************************************************************
     * Contextless Call Proxies
     *
     * NOTE: For EOAs or non-app contracts, they are the entry points for interacting
     * with agreements or apps.
     *
     * NOTE: The contextual call data should be generated using
     * abi.encodeWithSelector. The context parameter should be set to "0x",
     * an empty bytes array as a placeholder to be replaced by the host
     * contract.
     *************************************************************************/

     /**
      * @dev Call agreement function
      * @param agreementClass The agreement address you are calling
      * @param callData The contextual call data with placeholder ctx
      * @param userData Extra user data being sent to the super app callbacks
      */
     function callAgreement(
         ISuperAgreement agreementClass,
         bytes calldata callData,
         bytes calldata userData
     )
        external
        //cleanCtx
        //isAgreement(agreementClass)
        returns(bytes memory returnedData);

    /**
     * @notice Call app action
     * @dev Main use case is calling app action in a batch call via the host
     * @param callData The contextual call data
     *
     * @custom:note See "Contextless Call Proxies" above for more about contextual call data.
     */
    function callAppAction(
        ISuperApp app,
        bytes calldata callData
    )
        external
        //cleanCtx
        //isAppActive(app)
        //isValidAppAction(callData)
        returns(bytes memory returnedData);

    /**************************************************************************
     * Contextual Call Proxies and Context Utilities
     *
     * For apps, they must use context they receive to interact with
     * agreements or apps.
     *
     * The context changes must be saved and returned by the apps in their
     * callbacks always, any modification to the context will be detected and
     * the violating app will be jailed.
     *************************************************************************/

    /**
     * @dev Context Struct
     *
     * @custom:note on backward compatibility:
     * - Non-dynamic fields are padded to 32bytes and packed
     * - Dynamic fields are referenced through a 32bytes offset to their "parents" field (or root)
     * - The order of the fields hence should not be rearranged in order to be backward compatible:
     *    - non-dynamic fields will be parsed at the same memory location,
     *    - and dynamic fields will simply have a greater offset than it was.
     * - We cannot change the structure of the Context struct because of ABI compatibility requirements
     */
    struct Context {
        //
        // Call context
        //
        // app callback level
        uint8 appCallbackLevel;
        // type of call
        uint8 callType;
        // the system timestamp
        uint256 timestamp;
        // The intended message sender for the call
        address msgSender;

        //
        // Callback context
        //
        // For callbacks it is used to know which agreement function selector is called
        bytes4 agreementSelector;
        // User provided data for app callbacks
        bytes userData;

        //
        // App context
        //
        // app credit granted
        uint256 appCreditGranted;
        // app credit wanted by the app callback
        uint256 appCreditWantedDeprecated;
        // app credit used, allowing negative values over a callback session
        // the appCreditUsed value over a callback sessions is calculated with:
        // existing flow data owed deposit + sum of the callback agreements
        // deposit deltas
        // the final value used to modify the state is determined by the
        // _adjustNewAppCreditUsed function (in AgreementLibrary.sol) which takes
        // the appCreditUsed value reached in the callback session and the app
        // credit granted
        int256 appCreditUsed;
        // app address
        address appAddress;
        // app credit in super token
        ISuperfluidToken appCreditToken;
    }

    function callAgreementWithContext(
        ISuperAgreement agreementClass,
        bytes calldata callData,
        bytes calldata userData,
        bytes calldata ctx
    )
        external
        // requireValidCtx(ctx)
        // onlyAgreement(agreementClass)
        returns (bytes memory newCtx, bytes memory returnedData);

    function callAppActionWithContext(
        ISuperApp app,
        bytes calldata callData,
        bytes calldata ctx
    )
        external
        // requireValidCtx(ctx)
        // isAppActive(app)
        returns (bytes memory newCtx);

    function decodeCtx(bytes memory ctx)
        external pure
        returns (Context memory context);

    function isCtxValid(bytes calldata ctx) external view returns (bool);

    /**************************************************************************
    * Batch call
    **************************************************************************/
    /**
     * @dev Batch operation data
     */
    struct Operation {
        // Operation type. Defined in BatchOperation (Definitions.sol)
        uint32 operationType;
        // Operation target
        address target;
        // Data specific to the operation
        bytes data;
    }

    /**
     * @dev Batch call function
     * @param operations Array of batch operations
     */
    function batchCall(Operation[] calldata operations) external;

    /**
     * @dev Batch call function for trusted forwarders (EIP-2771)
     * @param operations Array of batch operations
     */
    function forwardBatchCall(Operation[] calldata operations) external;

    /**************************************************************************
     * Function modifiers for access control and parameter validations
     *
     * While they cannot be explicitly stated in function definitions, they are
     * listed in function definition comments instead for clarity.
     *
     * TODO: turning these off because solidity-coverage doesn't like it
     *************************************************************************/

     /* /// @dev The current superfluid context is clean.
     modifier cleanCtx() virtual;

     /// @dev Require the ctx being valid.
     modifier requireValidCtx(bytes memory ctx) virtual;

     /// @dev Assert the ctx being valid.
     modifier assertValidCtx(bytes memory ctx) virtual;

     /// @dev The agreement is a listed agreement.
     modifier isAgreement(ISuperAgreement agreementClass) virtual;

     // onlyGovernance

     /// @dev The msg.sender must be a listed agreement.
     modifier onlyAgreement() virtual;

     /// @dev The app is registered and not jailed.
     modifier isAppActive(ISuperApp app) virtual; */
}
          

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.11;

import { IERC721Metadata } from "@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol";

interface IFlowNFTBase is IERC721Metadata {
    // FlowNFTData struct storage packing:
    // b = bits
    // WORD 1: | superToken      | FREE
    //         | 160b            | 96b
    // WORD 2: | flowSender      | FREE
    //         | 160b            | 96b
    // WORD 3: | flowReceiver    | flowStartDate | FREE
    //         | 160b            | 32b           | 64b
    struct FlowNFTData {
        address superToken;
        address flowSender;
        address flowReceiver;
        uint32 flowStartDate;
    }

    /**************************************************************************
     * Custom Errors
     *************************************************************************/

    error CFA_NFT_APPROVE_CALLER_NOT_OWNER_OR_APPROVED_FOR_ALL();   // 0xa3352582
    error CFA_NFT_APPROVE_TO_CALLER();                              // 0xd3c77329
    error CFA_NFT_APPROVE_TO_CURRENT_OWNER();                       // 0xe4790b25
    error CFA_NFT_INVALID_TOKEN_ID();                               // 0xeab95e3b
    error CFA_NFT_ONLY_SUPER_TOKEN_FACTORY();                       // 0xebb7505b
    error CFA_NFT_TRANSFER_CALLER_NOT_OWNER_OR_APPROVED_FOR_ALL();  // 0x2551d606
    error CFA_NFT_TRANSFER_FROM_INCORRECT_OWNER();                  // 0x5a26c744
    error CFA_NFT_TRANSFER_IS_NOT_ALLOWED();                        // 0xaa747eca
    error CFA_NFT_TRANSFER_TO_ZERO_ADDRESS();                       // 0xde06d21e

    /**************************************************************************
     * Events
     *************************************************************************/

    /// @notice Informs third-party platforms that NFT metadata should be updated
    /// @dev This event comes from https://eips.ethereum.org/EIPS/eip-4906
    /// @param tokenId the id of the token that should have its metadata updated
    event MetadataUpdate(uint256 tokenId);

    /**************************************************************************
     * View
     *************************************************************************/

    /// @notice An external function for querying flow data by `tokenId``
    /// @param tokenId the token id
    /// @return flowData the flow data associated with `tokenId`
    function flowDataByTokenId(
        uint256 tokenId
    ) external view returns (FlowNFTData memory flowData);

    /// @notice An external function for computing the deterministic tokenId
    /// @dev tokenId = uint256(keccak256(abi.encode(block.chainId, superToken, flowSender, flowReceiver)))
    /// @param superToken the super token
    /// @param flowSender the flow sender
    /// @param flowReceiver the flow receiver
    /// @return tokenId the tokenId
    function getTokenId(
        address superToken,
        address flowSender,
        address flowReceiver
    ) external view returns (uint256);

    /**************************************************************************
     * Write
     *************************************************************************/

    function initialize(
        string memory nftName,
        string memory nftSymbol
    ) external; // initializer;

    function triggerMetadataUpdate(uint256 tokenId) external;
}
          

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.11;

// TODO
// solhint-disable-next-line no-empty-blocks
interface IPoolAdminNFT {}
          

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.11;

// TODO
// solhint-disable-next-line no-empty-blocks
interface IPoolMemberNFT {}
          

// SPDX-License-Identifier: MIT
pragma solidity >= 0.8.11;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { TokenInfo } from "./TokenInfo.sol";

/**
 * @title ERC20 token with token info interface
 * @author Superfluid
 * @dev Using abstract contract instead of interfaces because old solidity
 *      does not support interface inheriting other interfaces
 * solhint-disable-next-line no-empty-blocks
 *
 */
// solhint-disable-next-line no-empty-blocks
abstract contract ERC20WithTokenInfo is IERC20, TokenInfo {}
          

// SPDX-License-Identifier: MIT
pragma solidity >= 0.8.11;

import { ISuperfluidToken } from "./ISuperfluidToken.sol";

/**
 * @title Super agreement interface
 * @author Superfluid
 */
interface ISuperAgreement {

    /**
     * @dev Get the type of the agreement class
     */
    function agreementType() external view returns (bytes32);

    /**
     * @dev Calculate the real-time balance for the account of this agreement class
     * @param account Account the state belongs to
     * @param time Time used for the calculation
     * @return dynamicBalance Dynamic balance portion of real-time balance of this agreement
     * @return deposit Account deposit amount of this agreement
     * @return owedDeposit Account owed deposit amount of this agreement
     */
    function realtimeBalanceOf(
        ISuperfluidToken token,
        address account,
        uint256 time
    )
        external
        view
        returns (
            int256 dynamicBalance,
            uint256 deposit,
            uint256 owedDeposit
        );

}
          

// SPDX-License-Identifier: MIT
pragma solidity >= 0.8.11;

import { ISuperAgreement } from "./ISuperAgreement.sol";

/**
 * @title Superfluid token interface
 * @author Superfluid
 */
interface ISuperfluidToken {

    /**************************************************************************
     * Errors
     *************************************************************************/
    error SF_TOKEN_AGREEMENT_ALREADY_EXISTS();  // 0xf05521f6
    error SF_TOKEN_AGREEMENT_DOES_NOT_EXIST();  // 0xdae18809
    error SF_TOKEN_BURN_INSUFFICIENT_BALANCE(); // 0x10ecdf44
    error SF_TOKEN_MOVE_INSUFFICIENT_BALANCE(); // 0x2f4cb941
    error SF_TOKEN_ONLY_LISTED_AGREEMENT();     // 0xc9ff6644
    error SF_TOKEN_ONLY_HOST();                 // 0xc51efddd

    /**************************************************************************
     * Basic information
     *************************************************************************/

    /**
     * @dev Get superfluid host contract address
     */
    function getHost() external view returns(address host);

    /**
     * @dev Encoded liquidation type data mainly used for handling stack to deep errors
     *
     * @custom:note 
     * - version: 1
     * - liquidationType key:
     *    - 0 = reward account receives reward (PIC period)
     *    - 1 = liquidator account receives reward (Pleb period)
     *    - 2 = liquidator account receives reward (Pirate period/bailout)
     */
    struct LiquidationTypeData {
        uint256 version;
        uint8 liquidationType;
    }

    /**************************************************************************
     * Real-time balance functions
     *************************************************************************/

    /**
    * @dev Calculate the real balance of a user, taking in consideration all agreements of the account
    * @param account for the query
    * @param timestamp Time of balance
    * @return availableBalance Real-time balance
    * @return deposit Account deposit
    * @return owedDeposit Account owed Deposit
    */
    function realtimeBalanceOf(
       address account,
       uint256 timestamp
    )
        external view
        returns (
            int256 availableBalance,
            uint256 deposit,
            uint256 owedDeposit);

    /**
     * @notice Calculate the realtime balance given the current host.getNow() value
     * @dev realtimeBalanceOf with timestamp equals to block timestamp
     * @param account for the query
     * @return availableBalance Real-time balance
     * @return deposit Account deposit
     * @return owedDeposit Account owed Deposit
     */
    function realtimeBalanceOfNow(
       address account
    )
        external view
        returns (
            int256 availableBalance,
            uint256 deposit,
            uint256 owedDeposit,
            uint256 timestamp);

    /**
    * @notice Check if account is critical
    * @dev A critical account is when availableBalance < 0
    * @param account The account to check
    * @param timestamp The time we'd like to check if the account is critical (should use future)
    * @return isCritical Whether the account is critical
    */
    function isAccountCritical(
        address account,
        uint256 timestamp
    )
        external view
        returns(bool isCritical);

    /**
    * @notice Check if account is critical now (current host.getNow())
    * @dev A critical account is when availableBalance < 0
    * @param account The account to check
    * @return isCritical Whether the account is critical
    */
    function isAccountCriticalNow(
        address account
    )
        external view
        returns(bool isCritical);

    /**
     * @notice Check if account is solvent
     * @dev An account is insolvent when the sum of deposits for a token can't cover the negative availableBalance
     * @param account The account to check
     * @param timestamp The time we'd like to check if the account is solvent (should use future)
     * @return isSolvent True if the account is solvent, false otherwise
     */
    function isAccountSolvent(
        address account,
        uint256 timestamp
    )
        external view
        returns(bool isSolvent);

    /**
     * @notice Check if account is solvent now
     * @dev An account is insolvent when the sum of deposits for a token can't cover the negative availableBalance
     * @param account The account to check
     * @return isSolvent True if the account is solvent, false otherwise
     */
    function isAccountSolventNow(
        address account
    )
        external view
        returns(bool isSolvent);

    /**
    * @notice Get a list of agreements that is active for the account
    * @dev An active agreement is one that has state for the account
    * @param account Account to query
    * @return activeAgreements List of accounts that have non-zero states for the account
    */
    function getAccountActiveAgreements(address account)
       external view
       returns(ISuperAgreement[] memory activeAgreements);


   /**************************************************************************
    * Super Agreement hosting functions
    *************************************************************************/

    /**
     * @dev Create a new agreement
     * @param id Agreement ID
     * @param data Agreement data
     */
    function createAgreement(
        bytes32 id,
        bytes32[] calldata data
    )
        external;
    /**
     * @dev Agreement created event
     * @param agreementClass Contract address of the agreement
     * @param id Agreement ID
     * @param data Agreement data
     */
    event AgreementCreated(
        address indexed agreementClass,
        bytes32 id,
        bytes32[] data
    );

    /**
     * @dev Get data of the agreement
     * @param agreementClass Contract address of the agreement
     * @param id Agreement ID
     * @return data Data of the agreement
     */
    function getAgreementData(
        address agreementClass,
        bytes32 id,
        uint dataLength
    )
        external view
        returns(bytes32[] memory data);

    /**
     * @dev Create a new agreement
     * @param id Agreement ID
     * @param data Agreement data
     */
    function updateAgreementData(
        bytes32 id,
        bytes32[] calldata data
    )
        external;
    /**
     * @dev Agreement updated event
     * @param agreementClass Contract address of the agreement
     * @param id Agreement ID
     * @param data Agreement data
     */
    event AgreementUpdated(
        address indexed agreementClass,
        bytes32 id,
        bytes32[] data
    );

    /**
     * @dev Close the agreement
     * @param id Agreement ID
     */
    function terminateAgreement(
        bytes32 id,
        uint dataLength
    )
        external;
    /**
     * @dev Agreement terminated event
     * @param agreementClass Contract address of the agreement
     * @param id Agreement ID
     */
    event AgreementTerminated(
        address indexed agreementClass,
        bytes32 id
    );

    /**
     * @dev Update agreement state slot
     * @param account Account to be updated
     *
     * @custom:note 
     * - To clear the storage out, provide zero-ed array of intended length
     */
    function updateAgreementStateSlot(
        address account,
        uint256 slotId,
        bytes32[] calldata slotData
    )
        external;
    /**
     * @dev Agreement account state updated event
     * @param agreementClass Contract address of the agreement
     * @param account Account updated
     * @param slotId slot id of the agreement state
     */
    event AgreementStateUpdated(
        address indexed agreementClass,
        address indexed account,
        uint256 slotId
    );

    /**
     * @dev Get data of the slot of the state of an agreement
     * @param agreementClass Contract address of the agreement
     * @param account Account to query
     * @param slotId slot id of the state
     * @param dataLength length of the state data
     */
    function getAgreementStateSlot(
        address agreementClass,
        address account,
        uint256 slotId,
        uint dataLength
    )
        external view
        returns (bytes32[] memory slotData);

    /**
     * @notice Settle balance from an account by the agreement
     * @dev The agreement needs to make sure that the balance delta is balanced afterwards
     * @param account Account to query.
     * @param delta Amount of balance delta to be settled
     *
     * @custom:modifiers 
     *  - onlyAgreement
     */
    function settleBalance(
        address account,
        int256 delta
    )
        external;

    /**
     * @dev Make liquidation payouts (v2)
     * @param id Agreement ID
     * @param liquidationTypeData Data regarding the version of the liquidation schema and the type
     * @param liquidatorAccount Address of the executor of the liquidation
     * @param useDefaultRewardAccount Whether or not the default reward account receives the rewardAmount
     * @param targetAccount Account to be liquidated
     * @param rewardAmount The amount the rewarded account will receive
     * @param targetAccountBalanceDelta The delta amount the target account balance should change by
     *
     * @custom:note 
     * - If a bailout is required (bailoutAmount > 0)
     *   - the actual reward (single deposit) goes to the executor,
     *   - while the reward account becomes the bailout account
     *   - total bailout include: bailout amount + reward amount
     *   - the targetAccount will be bailed out
     * - If a bailout is not required
     *   - the targetAccount will pay the rewardAmount
     *   - the liquidator (reward account in PIC period) will receive the rewardAmount
     *
     * @custom:modifiers 
     *  - onlyAgreement
     */
    function makeLiquidationPayoutsV2
    (
        bytes32 id,
        bytes memory liquidationTypeData,
        address liquidatorAccount,
        bool useDefaultRewardAccount,
        address targetAccount,
        uint256 rewardAmount,
        int256 targetAccountBalanceDelta
    ) external;
    /**
     * @dev Agreement liquidation event v2 (including agent account)
     * @param agreementClass Contract address of the agreement
     * @param id Agreement ID
     * @param liquidatorAccount Address of the executor of the liquidation
     * @param targetAccount Account of the stream sender
     * @param rewardAmountReceiver Account that collects the reward or bails out insolvent accounts
     * @param rewardAmount The amount the reward recipient account balance should change by
     * @param targetAccountBalanceDelta The amount the sender account balance should change by
     * @param liquidationTypeData The encoded liquidation type data including the version (how to decode)
     *
     * @custom:note 
     * Reward account rule:
     * - if the agreement is liquidated during the PIC period
     *   - the rewardAmountReceiver will get the rewardAmount (remaining deposit), regardless of the liquidatorAccount
     *   - the targetAccount will pay for the rewardAmount
     * - if the agreement is liquidated after the PIC period AND the targetAccount is solvent
     *   - the rewardAmountReceiver will get the rewardAmount (remaining deposit)
     *   - the targetAccount will pay for the rewardAmount
     * - if the targetAccount is insolvent
     *   - the liquidatorAccount will get the rewardAmount (single deposit)
     *   - the default reward account (governance) will pay for both the rewardAmount and bailoutAmount
     *   - the targetAccount will receive the bailoutAmount
     */
    event AgreementLiquidatedV2(
        address indexed agreementClass,
        bytes32 id,
        address indexed liquidatorAccount,
        address indexed targetAccount,
        address rewardAmountReceiver,
        uint256 rewardAmount,
        int256 targetAccountBalanceDelta,
        bytes liquidationTypeData
    );

    /**************************************************************************
     * Function modifiers for access control and parameter validations
     *
     * While they cannot be explicitly stated in function definitions, they are
     * listed in function definition comments instead for clarity.
     *
     * NOTE: solidity-coverage not supporting it
     *************************************************************************/

     /// @dev The msg.sender must be host contract
     //modifier onlyHost() virtual;

    /// @dev The msg.sender must be a listed agreement.
    //modifier onlyAgreement() virtual;

    /**************************************************************************
     * DEPRECATED
     *************************************************************************/

    /**
     * @dev Agreement liquidation event (DEPRECATED BY AgreementLiquidatedBy)
     * @param agreementClass Contract address of the agreement
     * @param id Agreement ID
     * @param penaltyAccount Account of the agreement to be penalized
     * @param rewardAccount Account that collect the reward
     * @param rewardAmount Amount of liquidation reward
     *
     * @custom:deprecated Use AgreementLiquidatedV2 instead
     */
    event AgreementLiquidated(
        address indexed agreementClass,
        bytes32 id,
        address indexed penaltyAccount,
        address indexed rewardAccount,
        uint256 rewardAmount
    );

    /**
     * @dev System bailout occurred (DEPRECATED BY AgreementLiquidatedBy)
     * @param bailoutAccount Account that bailout the penalty account
     * @param bailoutAmount Amount of account bailout
     *
     * @custom:deprecated Use AgreementLiquidatedV2 instead
     */
    event Bailout(
        address indexed bailoutAccount,
        uint256 bailoutAmount
    );

    /**
     * @dev Agreement liquidation event (DEPRECATED BY AgreementLiquidatedV2)
     * @param liquidatorAccount Account of the agent that performed the liquidation.
     * @param agreementClass Contract address of the agreement
     * @param id Agreement ID
     * @param penaltyAccount Account of the agreement to be penalized
     * @param bondAccount Account that collect the reward or bailout accounts
     * @param rewardAmount Amount of liquidation reward
     * @param bailoutAmount Amount of liquidation bailouot
     *
     * @custom:deprecated Use AgreementLiquidatedV2 instead
     *
     * @custom:note 
     * Reward account rule:
     * - if bailout is equal to 0, then
     *   - the bondAccount will get the rewardAmount,
     *   - the penaltyAccount will pay for the rewardAmount.
     * - if bailout is larger than 0, then
     *   - the liquidatorAccount will get the rewardAmouont,
     *   - the bondAccount will pay for both the rewardAmount and bailoutAmount,
     *   - the penaltyAccount will pay for the rewardAmount while get the bailoutAmount.
     */
    event AgreementLiquidatedBy(
        address liquidatorAccount,
        address indexed agreementClass,
        bytes32 id,
        address indexed penaltyAccount,
        address indexed bondAccount,
        uint256 rewardAmount,
        uint256 bailoutAmount
    );
}
          

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.11;

import { IFlowNFTBase } from "./IFlowNFTBase.sol";

interface IConstantInflowNFT is IFlowNFTBase {
    /**************************************************************************
     * Custom Errors
     *************************************************************************/
    error CIF_NFT_ONLY_CONSTANT_OUTFLOW(); // 0xe81ef57a

    /**************************************************************************
     * Write Functions
     *************************************************************************/

    /// @notice The mint function emits the "mint" `Transfer` event.
    /// @dev We don't modify storage as this is handled in ConstantOutflowNFT.sol and this function's sole purpose
    /// is to inform clients that search for events.
    /// @param to the flow receiver (inflow NFT receiver)
    /// @param newTokenId the new token id
    function mint(address to, uint256 newTokenId) external;

    /// @notice This burn function emits the "burn" `Transfer` event.
    /// @dev We don't modify storage as this is handled in ConstantOutflowNFT.sol and this function's sole purpose
    /// is to inform clients that search for events.
    /// @param tokenId desired token id to burn
    function burn(uint256 tokenId) external;
}
          

// SPDX-License-Identifier: MIT
pragma solidity >= 0.8.11;

import { ISuperToken } from "./ISuperToken.sol";
import { IERC20, ERC20WithTokenInfo } from "../tokens/ERC20WithTokenInfo.sol";

/**
 * @title Super token factory interface
 * @author Superfluid
 */
interface ISuperTokenFactory {

    /**************************************************************************
     * Errors
     *************************************************************************/
    error SUPER_TOKEN_FACTORY_ALREADY_EXISTS();                 // 0x91d67972
    error SUPER_TOKEN_FACTORY_DOES_NOT_EXIST();                 // 0x872cac48
    error SUPER_TOKEN_FACTORY_UNINITIALIZED();                  // 0x1b39b9b4
    error SUPER_TOKEN_FACTORY_ONLY_HOST();                      // 0x478b8e83
    error SUPER_TOKEN_FACTORY_NON_UPGRADEABLE_IS_DEPRECATED();  // 0xc4901a43
    error SUPER_TOKEN_FACTORY_ZERO_ADDRESS();                   // 0x305c9e82

    /**************************************************************************
    * Immutable Variables
    **************************************************************************/

    /**
     * @dev Get superfluid host contract address
     */
    function getHost() external view returns(address host);

    /// @dev Initialize the contract
    function initialize() external;

    /**
     * @notice Get the canonical super token logic.
     */
    function getSuperTokenLogic() external view returns (ISuperToken superToken);

    /**
     * @dev Upgradability modes
     */
    enum Upgradability {
        /// Non upgradable super token, `host.updateSuperTokenLogic` will revert
        NON_UPGRADABLE,
        /// Upgradable through `host.updateSuperTokenLogic` operation
        SEMI_UPGRADABLE,
        /// Always using the latest super token logic
        FULL_UPGRADABLE
    }

    /**
     * @notice Create new super token wrapper for the underlying ERC20 token
     * @param underlyingToken Underlying ERC20 token
     * @param underlyingDecimals Underlying token decimals
     * @param upgradability Upgradability mode
     * @param name Super token name
     * @param symbol Super token symbol
     * @return superToken The deployed and initialized wrapper super token
     */
    function createERC20Wrapper(
        IERC20 underlyingToken,
        uint8 underlyingDecimals,
        Upgradability upgradability,
        string calldata name,
        string calldata symbol
    )
        external
        returns (ISuperToken superToken);

    /**
     * @notice Create new super token wrapper for the underlying ERC20 token with extra token info
     * @param underlyingToken Underlying ERC20 token
     * @param upgradability Upgradability mode
     * @param name Super token name
     * @param symbol Super token symbol
     * @return superToken The deployed and initialized wrapper super token
     * NOTE:
     * - It assumes token provide the .decimals() function
     */
    function createERC20Wrapper(
        ERC20WithTokenInfo underlyingToken,
        Upgradability upgradability,
        string calldata name,
        string calldata symbol
    )
        external
        returns (ISuperToken superToken);

    /**
     * @notice Creates a wrapper super token AND sets it in the canonical list OR reverts if it already exists
     * @dev salt for create2 is the keccak256 hash of abi.encode(address(_underlyingToken))
     * @param _underlyingToken Underlying ERC20 token
     * @return ISuperToken the created supertoken
     */
    function createCanonicalERC20Wrapper(ERC20WithTokenInfo _underlyingToken)
        external
        returns (ISuperToken);

    /**
     * @notice Computes/Retrieves wrapper super token address given the underlying token address
     * @dev We return from our canonical list if it already exists, otherwise we compute it
     * @dev note that this function only computes addresses for SEMI_UPGRADABLE SuperTokens
     * @param _underlyingToken Underlying ERC20 token address
     * @return superTokenAddress Super token address
     * @return isDeployed whether the super token is deployed AND set in the canonical mapping
     */
    function computeCanonicalERC20WrapperAddress(address _underlyingToken)
        external
        view
        returns (address superTokenAddress, bool isDeployed);

    /**
     * @notice Gets the canonical ERC20 wrapper super token address given the underlying token address
     * @dev We return the address if it exists and the zero address otherwise
     * @param _underlyingTokenAddress Underlying ERC20 token address
     * @return superTokenAddress Super token address
     */
    function getCanonicalERC20Wrapper(address _underlyingTokenAddress)
        external
        view
        returns (address superTokenAddress);

    /**
     * @dev Creates a new custom super token
     * @param customSuperTokenProxy address of the custom supertoken proxy
     */
    function initializeCustomSuperToken(
        address customSuperTokenProxy
    )
        external;

    /**
      * @dev Super token logic created event
      * @param tokenLogic Token logic address
      */
    event SuperTokenLogicCreated(ISuperToken indexed tokenLogic);

    /**
      * @dev Super token created event
      * @param token Newly created super token address
      */
    event SuperTokenCreated(ISuperToken indexed token);

    /**
      * @dev Custom super token created event
      * @param token Newly created custom super token address
      */
    event CustomSuperTokenCreated(ISuperToken indexed token);

}
          

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.11;

import { ISuperfluidToken } from "./ISuperfluidToken.sol";
import { IFlowNFTBase } from "./IFlowNFTBase.sol";

interface IConstantOutflowNFT is IFlowNFTBase {
    /**************************************************************************
     * Custom Errors
     *************************************************************************/

    error COF_NFT_INVALID_SUPER_TOKEN();            // 0x6de98774
    error COF_NFT_MINT_TO_AND_FLOW_RECEIVER_SAME(); // 0x0d1d1161
    error COF_NFT_MINT_TO_ZERO_ADDRESS();           // 0x43d05e51
    error COF_NFT_ONLY_CONSTANT_INFLOW();           // 0xa495a718
    error COF_NFT_ONLY_FLOW_AGREEMENTS();           // 0xd367b64f
    error COF_NFT_TOKEN_ALREADY_EXISTS();           // 0xe2480183


    /**************************************************************************
     * Write Functions
     *************************************************************************/

    /// @notice The onCreate function is called when a new flow is created.
    /// @param token the super token passed from the CFA (flowVars)
    /// @param flowSender the flow sender
    /// @param flowReceiver the flow receiver
    function onCreate(ISuperfluidToken token, address flowSender, address flowReceiver) external;

    /// @notice The onUpdate function is called when a flow is updated.
    /// @param token the super token passed from the CFA (flowVars)
    /// @param flowSender the flow sender
    /// @param flowReceiver the flow receiver
    function onUpdate(ISuperfluidToken token, address flowSender, address flowReceiver) external;

    /// @notice The onDelete function is called when a flow is deleted.
    /// @param token the super token passed from the CFA (flowVars)
    /// @param flowSender the flow sender
    /// @param flowReceiver the flow receiver
    function onDelete(ISuperfluidToken token, address flowSender, address flowReceiver) external;
}
          

// SPDX-License-Identifier: MIT
pragma solidity >= 0.8.11;

import { ISuperfluid } from "./ISuperfluid.sol";
import { ISuperToken } from "./ISuperToken.sol";
import { ISuperfluidToken } from "./ISuperfluidToken.sol";

/**
 * @title Superfluid governance interface
 * @author Superfluid
 */
interface ISuperfluidGovernance {

    /**************************************************************************
     * Errors
     *************************************************************************/
    error SF_GOV_INVALID_LIQUIDATION_OR_PATRICIAN_PERIOD(); // 0xe171980a
    error SF_GOV_MUST_BE_CONTRACT();                        // 0x80dddd73

    /**
     * @dev Replace the current governance with a new governance
     */
    function replaceGovernance(
        ISuperfluid host,
        address newGov) external;

    /**
     * @dev Register a new agreement class
     */
    function registerAgreementClass(
        ISuperfluid host,
        address agreementClass) external;

    /**
     * @dev Update logics of the contracts
     *
     * @custom:note
     * - Because they might have inter-dependencies, it is good to have one single function to update them all
     */
    function updateContracts(
        ISuperfluid host,
        address hostNewLogic,
        address[] calldata agreementClassNewLogics,
        address superTokenFactoryNewLogic
    ) external;

    /**
     * @dev Update supertoken logic contract to the latest that is managed by the super token factory
     */
    function batchUpdateSuperTokenLogic(
        ISuperfluid host,
        ISuperToken[] calldata tokens) external;

    /**
     * @dev Update supertoken logic contract to the provided logic contracts.
     *      Note that this is an overloaded version taking an additional argument `tokenLogics`
     */
    function batchUpdateSuperTokenLogic(
        ISuperfluid host,
        ISuperToken[] calldata tokens,
        address[] calldata tokenLogics) external;

    /**
     * @dev Set configuration as address value
     */
    function setConfig(
        ISuperfluid host,
        ISuperfluidToken superToken,
        bytes32 key,
        address value
    ) external;

    /**
     * @dev Set configuration as uint256 value
     */
    function setConfig(
        ISuperfluid host,
        ISuperfluidToken superToken,
        bytes32 key,
        uint256 value
    ) external;

    /**
     * @dev Clear configuration
     */
    function clearConfig(
        ISuperfluid host,
        ISuperfluidToken superToken,
        bytes32 key
    ) external;

    /**
     * @dev Get configuration as address value
     */
    function getConfigAsAddress(
        ISuperfluid host,
        ISuperfluidToken superToken,
        bytes32 key) external view returns (address value);

    /**
     * @dev Get configuration as uint256 value
     */
    function getConfigAsUint256(
        ISuperfluid host,
        ISuperfluidToken superToken,
        bytes32 key) external view returns (uint256 value);

}
          

// SPDX-License-Identifier: MIT
pragma solidity >= 0.8.11;

import { ISuperAgreement } from "../superfluid/ISuperAgreement.sol";
import { ISuperfluidToken } from "../superfluid/ISuperfluidToken.sol";

/**
 * @title Constant Flow Agreement interface
 * @author Superfluid
 */
abstract contract IConstantFlowAgreementV1 is ISuperAgreement {

    /**************************************************************************
     * Errors
     *************************************************************************/
    error CFA_ACL_NO_SENDER_CREATE();               // 0x4b993136
    error CFA_ACL_NO_SENDER_UPDATE();               // 0xedfa0d3b
    error CFA_ACL_OPERATOR_NO_CREATE_PERMISSIONS(); // 0xa3eab6ac
    error CFA_ACL_OPERATOR_NO_UPDATE_PERMISSIONS(); // 0xac434b5f
    error CFA_ACL_OPERATOR_NO_DELETE_PERMISSIONS(); // 0xe30f1bff
    error CFA_ACL_FLOW_RATE_ALLOWANCE_EXCEEDED();   // 0xa0645c1f
    error CFA_ACL_UNCLEAN_PERMISSIONS();            // 0x7939d66c
    error CFA_ACL_NO_SENDER_FLOW_OPERATOR();        // 0xb0ed394d
    error CFA_ACL_NO_NEGATIVE_ALLOWANCE();          // 0x86e0377d
    error CFA_FLOW_ALREADY_EXISTS();                // 0x801b6863
    error CFA_FLOW_DOES_NOT_EXIST();                // 0x5a32bf24
    error CFA_INSUFFICIENT_BALANCE();               // 0xea76c9b3
    error CFA_ZERO_ADDRESS_SENDER();                // 0x1ce9b067
    error CFA_ZERO_ADDRESS_RECEIVER();              // 0x78e02b2a
    error CFA_HOOK_OUT_OF_GAS();                    // 0x9f76430b
    error CFA_DEPOSIT_TOO_BIG();                    // 0x752c2b9c
    error CFA_FLOW_RATE_TOO_BIG();                  // 0x0c9c55c1
    error CFA_NON_CRITICAL_SENDER();                // 0xce11b5d1
    error CFA_INVALID_FLOW_RATE();                  // 0x91acad16
    error CFA_NO_SELF_FLOW();                       // 0xa47338ef

    /// @dev ISuperAgreement.agreementType implementation
    function agreementType() external override pure returns (bytes32) {
        return keccak256("org.superfluid-finance.agreements.ConstantFlowAgreement.v1");
    }

    /**
     * @notice Get the maximum flow rate allowed with the deposit
     * @dev The deposit is clipped and rounded down
     * @param deposit Deposit amount used for creating the flow
     * @return flowRate The maximum flow rate
     */
    function getMaximumFlowRateFromDeposit(
        ISuperfluidToken token,
        uint256 deposit)
        external view virtual
        returns (int96 flowRate);

    /**
     * @notice Get the deposit required for creating the flow
     * @dev Calculates the deposit based on the liquidationPeriod and flowRate
     * @param flowRate Flow rate to be tested
     * @return deposit The deposit amount based on flowRate and liquidationPeriod
     * @custom:note
     * - if calculated deposit (flowRate * liquidationPeriod) is less
     *   than the minimum deposit, we use the minimum deposit otherwise
     *   we use the calculated deposit
     */
    function getDepositRequiredForFlowRate(
        ISuperfluidToken token,
        int96 flowRate)
        external view virtual
        returns (uint256 deposit);

    /**
     * @dev Returns whether it is the patrician period based on host.getNow()
     * @param account The account we are interested in
     * @return isCurrentlyPatricianPeriod Whether it is currently the patrician period dictated by governance
     * @return timestamp The value of host.getNow()
     */
    function isPatricianPeriodNow(
        ISuperfluidToken token,
        address account)
        external view virtual
        returns (bool isCurrentlyPatricianPeriod, uint256 timestamp);

    /**
     * @dev Returns whether it is the patrician period based on timestamp
     * @param account The account we are interested in
     * @param timestamp The timestamp we are interested in observing the result of isPatricianPeriod
     * @return bool Whether it is currently the patrician period dictated by governance
     */
    function isPatricianPeriod(
        ISuperfluidToken token,
        address account,
        uint256 timestamp
    )
        public view virtual
        returns (bool);

    /**
     * @dev msgSender from `ctx` updates permissions for the `flowOperator` with `flowRateAllowance`
     * @param token Super token address
     * @param flowOperator The permission grantee address
     * @param permissions A bitmask representation of the granted permissions
     * @param flowRateAllowance The flow rate allowance the `flowOperator` is granted (only goes down)
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     */
    function updateFlowOperatorPermissions(
        ISuperfluidToken token,
        address flowOperator,
        uint8 permissions,
        int96 flowRateAllowance,
        bytes calldata ctx
    )
        external virtual
        returns(bytes memory newCtx);

    /**
     * @notice msgSender from `ctx` increases flow rate allowance for the `flowOperator` by `addedFlowRateAllowance`
     * @dev if `addedFlowRateAllowance` is negative, we revert with CFA_ACL_NO_NEGATIVE_ALLOWANCE
     * @param token Super token address
     * @param flowOperator The permission grantee address
     * @param addedFlowRateAllowance The flow rate allowance delta
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     * @return newCtx The new context bytes
     */
    function increaseFlowRateAllowance(
        ISuperfluidToken token,
        address flowOperator,
        int96 addedFlowRateAllowance,
        bytes calldata ctx
    ) external virtual returns(bytes memory newCtx);

    /**
     * @dev msgSender from `ctx` decreases flow rate allowance for the `flowOperator` by `subtractedFlowRateAllowance`
     * @dev if `subtractedFlowRateAllowance` is negative, we revert with CFA_ACL_NO_NEGATIVE_ALLOWANCE
     * @param token Super token address
     * @param flowOperator The permission grantee address
     * @param subtractedFlowRateAllowance The flow rate allowance delta
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     * @return newCtx The new context bytes
     */
    function decreaseFlowRateAllowance(
        ISuperfluidToken token,
        address flowOperator,
        int96 subtractedFlowRateAllowance,
        bytes calldata ctx
    ) external virtual returns(bytes memory newCtx);

    /**
     * @dev msgSender from `ctx` increases flow rate allowance for the `flowOperator` by `addedFlowRateAllowance`
     * @dev if `addedFlowRateAllowance` is negative, we revert with CFA_ACL_NO_NEGATIVE_ALLOWANCE
     * @param token Super token address
     * @param flowOperator The permission grantee address
     * @param permissionsToAdd A bitmask representation of the granted permissions to add as a delta
     * @param addedFlowRateAllowance The flow rate allowance delta
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     * @return newCtx The new context bytes
     */
    function increaseFlowRateAllowanceWithPermissions(
        ISuperfluidToken token,
        address flowOperator,
        uint8 permissionsToAdd,
        int96 addedFlowRateAllowance,
        bytes calldata ctx
    ) external virtual returns(bytes memory newCtx);

    /**
     * @dev msgSender from `ctx` decreases flow rate allowance for the `flowOperator` by `subtractedFlowRateAllowance`
     * @dev if `subtractedFlowRateAllowance` is negative, we revert with CFA_ACL_NO_NEGATIVE_ALLOWANCE
     * @param token Super token address
     * @param flowOperator The permission grantee address
     * @param permissionsToRemove A bitmask representation of the granted permissions to remove as a delta
     * @param subtractedFlowRateAllowance The flow rate allowance delta
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     * @return newCtx The new context bytes
     */
    function decreaseFlowRateAllowanceWithPermissions(
        ISuperfluidToken token,
        address flowOperator,
        uint8 permissionsToRemove,
        int96 subtractedFlowRateAllowance,
        bytes calldata ctx
    ) external virtual returns(bytes memory newCtx);

    /**
     * @dev msgSender from `ctx` grants `flowOperator` all permissions with flowRateAllowance as type(int96).max
     * @param token Super token address
     * @param flowOperator The permission grantee address
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     */
    function authorizeFlowOperatorWithFullControl(
        ISuperfluidToken token,
        address flowOperator,
        bytes calldata ctx
    )
        external virtual
        returns(bytes memory newCtx);

     /**
     * @notice msgSender from `ctx` revokes `flowOperator` create/update/delete permissions
     * @dev `permissions` and `flowRateAllowance` will both be set to 0
     * @param token Super token address
     * @param flowOperator The permission grantee address
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     */
    function revokeFlowOperatorWithFullControl(
        ISuperfluidToken token,
        address flowOperator,
        bytes calldata ctx
    )
        external virtual
        returns(bytes memory newCtx);

    /**
     * @notice Get the permissions of a flow operator between `sender` and `flowOperator` for `token`
     * @param token Super token address
     * @param sender The permission granter address
     * @param flowOperator The permission grantee address
     * @return flowOperatorId The keccak256 hash of encoded string "flowOperator", sender and flowOperator
     * @return permissions A bitmask representation of the granted permissions
     * @return flowRateAllowance The flow rate allowance the `flowOperator` is granted (only goes down)
     */
    function getFlowOperatorData(
       ISuperfluidToken token,
       address sender,
       address flowOperator
    )
        public view virtual
        returns (
            bytes32 flowOperatorId,
            uint8 permissions,
            int96 flowRateAllowance
        );

    /**
     * @notice Get flow operator using flowOperatorId
     * @param token Super token address
     * @param flowOperatorId The keccak256 hash of encoded string "flowOperator", sender and flowOperator
     * @return permissions A bitmask representation of the granted permissions
     * @return flowRateAllowance The flow rate allowance the `flowOperator` is granted (only goes down)
     */
    function getFlowOperatorDataByID(
       ISuperfluidToken token,
       bytes32 flowOperatorId
    )
        external view virtual
        returns (
            uint8 permissions,
            int96 flowRateAllowance
        );

    /**
     * @notice Create a flow betwen ctx.msgSender and receiver
     * @dev flowId (agreementId) is the keccak256 hash of encoded sender and receiver
     * @param token Super token address
     * @param receiver Flow receiver address
     * @param flowRate New flow rate in amount per second
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     *
     * @custom:callbacks
     * - AgreementCreated
     *   - agreementId - can be used in getFlowByID
     *   - agreementData - abi.encode(address flowSender, address flowReceiver)
     *
     * @custom:note
     * - A deposit is taken as safety margin for the solvency agents
     * - A extra gas fee may be taken to pay for solvency agent liquidations
     */
    function createFlow(
        ISuperfluidToken token,
        address receiver,
        int96 flowRate,
        bytes calldata ctx
    )
        external virtual
        returns(bytes memory newCtx);

    /**
    * @notice Create a flow between sender and receiver
    * @dev A flow created by an approved flow operator (see above for details on callbacks)
    * @param token Super token address
    * @param sender Flow sender address (has granted permissions)
    * @param receiver Flow receiver address
    * @param flowRate New flow rate in amount per second
    * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
    */
    function createFlowByOperator(
        ISuperfluidToken token,
        address sender,
        address receiver,
        int96 flowRate,
        bytes calldata ctx
    )
        external virtual
        returns(bytes memory newCtx);

    /**
     * @notice Update the flow rate between ctx.msgSender and receiver
     * @dev flowId (agreementId) is the keccak256 hash of encoded sender and receiver
     * @param token Super token address
     * @param receiver Flow receiver address
     * @param flowRate New flow rate in amount per second
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     *
     * @custom:callbacks
     * - AgreementUpdated
     *   - agreementId - can be used in getFlowByID
     *   - agreementData - abi.encode(address flowSender, address flowReceiver)
     *
     * @custom:note
     * - Only the flow sender may update the flow rate
     * - Even if the flow rate is zero, the flow is not deleted
     * from the system
     * - Deposit amount will be adjusted accordingly
     * - No new gas fee is charged
     */
    function updateFlow(
        ISuperfluidToken token,
        address receiver,
        int96 flowRate,
        bytes calldata ctx
    )
        external virtual
        returns(bytes memory newCtx);

    /**
    * @notice Update a flow between sender and receiver
    * @dev A flow updated by an approved flow operator (see above for details on callbacks)
    * @param token Super token address
    * @param sender Flow sender address (has granted permissions)
    * @param receiver Flow receiver address
    * @param flowRate New flow rate in amount per second
    * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
    */
    function updateFlowByOperator(
        ISuperfluidToken token,
        address sender,
        address receiver,
        int96 flowRate,
        bytes calldata ctx
    )
        external virtual
        returns(bytes memory newCtx);

    /**
     * @dev Get the flow data between `sender` and `receiver` of `token`
     * @param token Super token address
     * @param sender Flow receiver
     * @param receiver Flow sender
     * @return timestamp Timestamp of when the flow is updated
     * @return flowRate The flow rate
     * @return deposit The amount of deposit the flow
     * @return owedDeposit The amount of owed deposit of the flow
     */
    function getFlow(
        ISuperfluidToken token,
        address sender,
        address receiver
    )
        external view virtual
        returns (
            uint256 timestamp,
            int96 flowRate,
            uint256 deposit,
            uint256 owedDeposit
        );

    /**
     * @notice Get flow data using agreementId
     * @dev flowId (agreementId) is the keccak256 hash of encoded sender and receiver
     * @param token Super token address
     * @param agreementId The agreement ID
     * @return timestamp Timestamp of when the flow is updated
     * @return flowRate The flow rate
     * @return deposit The deposit amount of the flow
     * @return owedDeposit The owed deposit amount of the flow
     */
    function getFlowByID(
       ISuperfluidToken token,
       bytes32 agreementId
    )
        external view virtual
        returns (
            uint256 timestamp,
            int96 flowRate,
            uint256 deposit,
            uint256 owedDeposit
        );

    /**
     * @dev Get the aggregated flow info of the account
     * @param token Super token address
     * @param account Account for the query
     * @return timestamp Timestamp of when a flow was last updated for account
     * @return flowRate The net flow rate of token for account
     * @return deposit The sum of all deposits for account's flows
     * @return owedDeposit The sum of all owed deposits for account's flows
     */
    function getAccountFlowInfo(
        ISuperfluidToken token,
        address account
    )
        external view virtual
        returns (
            uint256 timestamp,
            int96 flowRate,
            uint256 deposit,
            uint256 owedDeposit);

    /**
     * @dev Get the net flow rate of the account
     * @param token Super token address
     * @param account Account for the query
     * @return flowRate Net flow rate
     */
    function getNetFlow(
        ISuperfluidToken token,
        address account
    )
        external view virtual
        returns (int96 flowRate);

    /**
     * @notice Delete the flow between sender and receiver
     * @dev flowId (agreementId) is the keccak256 hash of encoded sender and receiver
     * @param token Super token address
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     * @param receiver Flow receiver address
     *
     * @custom:callbacks
     * - AgreementTerminated
     *   - agreementId - can be used in getFlowByID
     *   - agreementData - abi.encode(address flowSender, address flowReceiver)
     *
     * @custom:note
     * - Both flow sender and receiver may delete the flow
     * - If Sender account is insolvent or in critical state, a solvency agent may
     *   also terminate the agreement
     * - Gas fee may be returned to the sender
     */
    function deleteFlow(
        ISuperfluidToken token,
        address sender,
        address receiver,
        bytes calldata ctx
    )
        external virtual
        returns(bytes memory newCtx);

    /**
     * @notice Delete the flow between sender and receiver
     * @dev A flow deleted by an approved flow operator (see above for details on callbacks)
     * @param token Super token address
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     * @param receiver Flow receiver address
     */
    function deleteFlowByOperator(
        ISuperfluidToken token,
        address sender,
        address receiver,
        bytes calldata ctx
    )
        external virtual
        returns(bytes memory newCtx);

    /**
     * @dev Flow operator updated event
     * @param token Super token address
     * @param sender Flow sender address
     * @param flowOperator Flow operator address
     * @param permissions Octo bitmask representation of permissions
     * @param flowRateAllowance The flow rate allowance the `flowOperator` is granted (only goes down)
     */
    event FlowOperatorUpdated(
        ISuperfluidToken indexed token,
        address indexed sender,
        address indexed flowOperator,
        uint8 permissions,
        int96 flowRateAllowance
    );

    /**
     * @dev Flow updated event
     * @param token Super token address
     * @param sender Flow sender address
     * @param receiver Flow recipient address
     * @param flowRate Flow rate in amount per second for this flow
     * @param totalSenderFlowRate Total flow rate in amount per second for the sender
     * @param totalReceiverFlowRate Total flow rate in amount per second for the receiver
     * @param userData The user provided data
     *
     */
    event FlowUpdated(
        ISuperfluidToken indexed token,
        address indexed sender,
        address indexed receiver,
        int96 flowRate,
        int256 totalSenderFlowRate,
        int256 totalReceiverFlowRate,
        bytes userData
    );

    /**
     * @dev Flow updated extension event
     * @param flowOperator Flow operator address - the Context.msgSender
     * @param deposit The deposit amount for the stream
     */
    event FlowUpdatedExtension(
        address indexed flowOperator,
        uint256 deposit
    );
}
          

// SPDX-License-Identifier: MIT
pragma solidity >= 0.8.11;

import { ISuperAgreement } from "../superfluid/ISuperAgreement.sol";
import { ISuperfluidToken } from "../superfluid/ISuperfluidToken.sol";

/**
 * @title Instant Distribution Agreement interface
 * @author Superfluid
 *
 * @notice 
 *   - A publisher can create as many as indices as possibly identifiable with `indexId`.
 *     - `indexId` is deliberately limited to 32 bits, to avoid the chance for sha-3 collision.
 *       Despite knowing sha-3 collision is only theoretical.
 *   - A publisher can create a subscription to an index for any subscriber.
 *   - A subscription consists of:
 *     - The index it subscribes to.
 *     - Number of units subscribed.
 *   - An index consists of:
 *     - Current value as `uint128 indexValue`.
 *     - Total units of the approved subscriptions as `uint128 totalUnitsApproved`.
 *     - Total units of the non approved subscription as `uint128 totalUnitsPending`.
 *   - A publisher can update an index with a new value that doesn't decrease.
 *   - A publisher can update a subscription with any number of units.
 *   - A publisher or a subscriber can delete a subscription and reset its units to zero.
 *   - A subscriber must approve the index in order to receive distributions from the publisher
 *     each time the index is updated.
 *     - The amount distributed is $$\Delta{index} * units$$
 *   - Distributions to a non approved subscription stays in the publisher's deposit until:
 *     - the subscriber approves the subscription (side effect),
 *     - the publisher updates the subscription (side effect),
 *     - the subscriber deletes the subscription even if it is never approved (side effect),
 *     - or the subscriber can explicitly claim them.
 */
abstract contract IInstantDistributionAgreementV1 is ISuperAgreement {

    /**************************************************************************
     * Errors
     *************************************************************************/
    error IDA_INDEX_SHOULD_GROW();             // 0xcfdca725
    error IDA_OPERATION_NOT_ALLOWED();         // 0x92da6d17
    error IDA_INDEX_ALREADY_EXISTS();          // 0x5c02a517
    error IDA_INDEX_DOES_NOT_EXIST();          // 0xedeaa63b
    error IDA_SUBSCRIPTION_DOES_NOT_EXIST();   // 0xb6c8c980
    error IDA_SUBSCRIPTION_ALREADY_APPROVED(); // 0x3eb2f849
    error IDA_SUBSCRIPTION_IS_NOT_APPROVED();  // 0x37412573
    error IDA_INSUFFICIENT_BALANCE();          // 0x16e759bb
    error IDA_ZERO_ADDRESS_SUBSCRIBER();       // 0xc90a4674

    /// @dev ISuperAgreement.agreementType implementation
    function agreementType() external override pure returns (bytes32) {
        return keccak256("org.superfluid-finance.agreements.InstantDistributionAgreement.v1");
    }

    /**************************************************************************
     * Index operations
     *************************************************************************/

    /**
     * @dev Create a new index for the publisher
     * @param token Super token address
     * @param indexId Id of the index
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     *
     * @custom:callbacks 
     * None
     */
    function createIndex(
        ISuperfluidToken token,
        uint32 indexId,
        bytes calldata ctx)
            external
            virtual
            returns(bytes memory newCtx);
    /**
    * @dev Index created event
    * @param token Super token address
    * @param publisher Index creator and publisher
    * @param indexId The specified indexId of the newly created index
    * @param userData The user provided data
    */
    event IndexCreated(
        ISuperfluidToken indexed token,
        address indexed publisher,
        uint32 indexed indexId,
        bytes userData);

    /**
     * @dev Query the data of a index
     * @param token Super token address
     * @param publisher The publisher of the index
     * @param indexId Id of the index
     * @return exist Does the index exist
     * @return indexValue Value of the current index
     * @return totalUnitsApproved Total units approved for the index
     * @return totalUnitsPending Total units pending approval for the index
     */
    function getIndex(
        ISuperfluidToken token,
        address publisher,
        uint32 indexId)
            external
            view
            virtual
            returns(
                bool exist,
                uint128 indexValue,
                uint128 totalUnitsApproved,
                uint128 totalUnitsPending);

    /**
     * @dev Calculate actual distribution amount
     * @param token Super token address
     * @param publisher The publisher of the index
     * @param indexId Id of the index
     * @param amount The amount of tokens desired to be distributed
     * @return actualAmount The amount to be distributed after ensuring no rounding errors
     * @return newIndexValue The index value given the desired amount of tokens to be distributed
     */
    function calculateDistribution(
       ISuperfluidToken token,
       address publisher,
       uint32 indexId,
       uint256 amount)
           external view
           virtual
           returns(
               uint256 actualAmount,
               uint128 newIndexValue);

    /**
     * @dev Update index value of an index
     * @param token Super token address
     * @param indexId Id of the index
     * @param indexValue Value of the index
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     *
     * @custom:callbacks 
     * None
     */
    function updateIndex(
        ISuperfluidToken token,
        uint32 indexId,
        uint128 indexValue,
        bytes calldata ctx)
            external
            virtual
            returns(bytes memory newCtx);
    /**
      * @dev Index updated event
      * @param token Super token address
      * @param publisher Index updater and publisher
      * @param indexId The specified indexId of the updated index
      * @param oldIndexValue The previous index value
      * @param newIndexValue The updated index value
      * @param totalUnitsPending The total units pending when the indexValue was updated
      * @param totalUnitsApproved The total units approved when the indexValue was updated
      * @param userData The user provided data
      */
    event IndexUpdated(
        ISuperfluidToken indexed token,
        address indexed publisher,
        uint32 indexed indexId,
        uint128 oldIndexValue,
        uint128 newIndexValue,
        uint128 totalUnitsPending,
        uint128 totalUnitsApproved,
        bytes userData);

    /**
     * @dev Distribute tokens through the index
     * @param token Super token address
     * @param indexId Id of the index
     * @param amount The amount of tokens desired to be distributed
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     *
     * @custom:note 
     * - This is a convenient version of updateIndex. It adds to the index
     *   a delta that equals to `amount / totalUnits`
     * - The actual amount distributed could be obtained via
     *   `calculateDistribution`. This is due to precision error with index
     *   value and units data range
     *
     * @custom:callbacks 
     * None
     */
    function distribute(
        ISuperfluidToken token,
        uint32 indexId,
        uint256 amount,
        bytes calldata ctx)
            external
            virtual
            returns(bytes memory newCtx);


    /**************************************************************************
     * Subscription operations
     *************************************************************************/

    /**
     * @dev Approve the subscription of an index
     * @param token Super token address
     * @param publisher The publisher of the index
     * @param indexId Id of the index
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     *
     * @custom:callbacks 
     * - if subscription exist
     *   - AgreementCreated callback to the publisher:
     *      - agreementId is for the subscription
     * - if subscription does not exist
     *   - AgreementUpdated callback to the publisher:
     *      - agreementId is for the subscription
     */
    function approveSubscription(
        ISuperfluidToken token,
        address publisher,
        uint32 indexId,
        bytes calldata ctx)
            external
            virtual
            returns(bytes memory newCtx);
    /**
      * @dev Index subscribed event
      * @param token Super token address
      * @param publisher Index publisher
      * @param indexId The specified indexId
      * @param subscriber The approved subscriber
      * @param userData The user provided data
      */
    event IndexSubscribed(
        ISuperfluidToken indexed token,
        address indexed publisher,
        uint32 indexed indexId,
        address subscriber,
        bytes userData);

    /**
      * @dev Subscription approved event
      * @param token Super token address
      * @param subscriber The approved subscriber
      * @param publisher Index publisher
      * @param indexId The specified indexId
      * @param userData The user provided data
      */
    event SubscriptionApproved(
        ISuperfluidToken indexed token,
        address indexed subscriber,
        address publisher,
        uint32 indexId,
        bytes userData);

    /**
    * @notice Revoke the subscription of an index
    * @dev "Unapproves" the subscription and moves approved units to pending
    * @param token Super token address
    * @param publisher The publisher of the index
    * @param indexId Id of the index
    * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
    *
    * @custom:callbacks 
    * - AgreementUpdated callback to the publisher:
    *    - agreementId is for the subscription
    */
    function revokeSubscription(
        ISuperfluidToken token,
        address publisher,
        uint32 indexId,
        bytes calldata ctx)
         external
         virtual
         returns(bytes memory newCtx);
    /**
      * @dev Index unsubscribed event
      * @param token Super token address
      * @param publisher Index publisher
      * @param indexId The specified indexId
      * @param subscriber The unsubscribed subscriber
      * @param userData The user provided data
      */
    event IndexUnsubscribed(
        ISuperfluidToken indexed token,
        address indexed publisher,
        uint32 indexed indexId,
        address subscriber,
        bytes userData);
    
    /**
      * @dev Subscription approved event
      * @param token Super token address
      * @param subscriber The approved subscriber
      * @param publisher Index publisher
      * @param indexId The specified indexId
      * @param userData The user provided data
      */
    event SubscriptionRevoked(
        ISuperfluidToken indexed token,
        address indexed subscriber,
        address publisher,
        uint32 indexId,
        bytes userData);

    /**
     * @dev Update the nuber of units of a subscription
     * @param token Super token address
     * @param indexId Id of the index
     * @param subscriber The subscriber of the index
     * @param units Number of units of the subscription
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     *
     * @custom:callbacks 
     * - if subscription exist
     *   - AgreementCreated callback to the subscriber:
     *      - agreementId is for the subscription
     * - if subscription does not exist
     *   - AgreementUpdated callback to the subscriber:
     *      - agreementId is for the subscription
     */
    function updateSubscription(
        ISuperfluidToken token,
        uint32 indexId,
        address subscriber,
        uint128 units,
        bytes calldata ctx)
            external
            virtual
            returns(bytes memory newCtx);

    /**
      * @dev Index units updated event
      * @param token Super token address
      * @param publisher Index publisher
      * @param indexId The specified indexId
      * @param subscriber The subscriber units updated
      * @param units The new units amount
      * @param userData The user provided data
      */
    event IndexUnitsUpdated(
        ISuperfluidToken indexed token,
        address indexed publisher,
        uint32 indexed indexId,
        address subscriber,
        uint128 units,
        bytes userData);
    
    /**
      * @dev Subscription units updated event
      * @param token Super token address
      * @param subscriber The subscriber units updated
      * @param indexId The specified indexId
      * @param publisher Index publisher
      * @param units The new units amount
      * @param userData The user provided data
      */
    event SubscriptionUnitsUpdated(
        ISuperfluidToken indexed token,
        address indexed subscriber,
        address publisher,
        uint32 indexId,
        uint128 units,
        bytes userData);

    /**
     * @dev Get data of a subscription
     * @param token Super token address
     * @param publisher The publisher of the index
     * @param indexId Id of the index
     * @param subscriber The subscriber of the index
     * @return exist Does the subscription exist?
     * @return approved Is the subscription approved?
     * @return units Units of the suscription
     * @return pendingDistribution Pending amount of tokens to be distributed for unapproved subscription
     */
    function getSubscription(
        ISuperfluidToken token,
        address publisher,
        uint32 indexId,
        address subscriber)
            external
            view
            virtual
            returns(
                bool exist,
                bool approved,
                uint128 units,
                uint256 pendingDistribution
            );

    /**
     * @notice Get data of a subscription by agreement ID
     * @dev indexId (agreementId) is the keccak256 hash of encodePacked("publisher", publisher, indexId)
     * @param token Super token address
     * @param agreementId The agreement ID
     * @return publisher The publisher of the index
     * @return indexId Id of the index
     * @return approved Is the subscription approved?
     * @return units Units of the suscription
     * @return pendingDistribution Pending amount of tokens to be distributed for unapproved subscription
     */
    function getSubscriptionByID(
        ISuperfluidToken token,
        bytes32 agreementId)
            external
            view
            virtual
            returns(
                address publisher,
                uint32 indexId,
                bool approved,
                uint128 units,
                uint256 pendingDistribution
            );

    /**
     * @dev List subscriptions of an user
     * @param token Super token address
     * @param subscriber The subscriber's address
     * @return publishers Publishers of the subcriptions
     * @return indexIds Indexes of the subscriptions
     * @return unitsList Units of the subscriptions
     */
    function listSubscriptions(
        ISuperfluidToken token,
        address subscriber)
            external
            view
            virtual
            returns(
                address[] memory publishers,
                uint32[] memory indexIds,
                uint128[] memory unitsList);

    /**
     * @dev Delete the subscription of an user
     * @param token Super token address
     * @param publisher The publisher of the index
     * @param indexId Id of the index
     * @param subscriber The subscriber's address
     * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
     *
     * @custom:callbacks 
     * - if the subscriber called it
     *   - AgreementTerminated callback to the publsiher:
     *      - agreementId is for the subscription
     * - if the publisher called it
     *   - AgreementTerminated callback to the subscriber:
     *      - agreementId is for the subscription
     */
    function deleteSubscription(
        ISuperfluidToken token,
        address publisher,
        uint32 indexId,
        address subscriber,
        bytes calldata ctx)
            external
            virtual
            returns(bytes memory newCtx);

    /**
    * @dev Claim pending distributions
    * @param token Super token address
    * @param publisher The publisher of the index
    * @param indexId Id of the index
    * @param subscriber The subscriber's address
    * @param ctx Context bytes (see ISuperfluid.sol for Context struct)
    *
    * @custom:note The subscription should not be approved yet
    *
    * @custom:callbacks 
    * - AgreementUpdated callback to the publisher:
    *    - agreementId is for the subscription
    */
    function claim(
        ISuperfluidToken token,
        address publisher,
        uint32 indexId,
        address subscriber,
        bytes calldata ctx)
        external
        virtual
        returns(bytes memory newCtx);
    
    /**
      * @dev Index distribution claimed event
      * @param token Super token address
      * @param publisher Index publisher
      * @param indexId The specified indexId
      * @param subscriber The subscriber units updated
      * @param amount The pending amount claimed
      */
    event IndexDistributionClaimed(
        ISuperfluidToken indexed token,
        address indexed publisher,
        uint32 indexed indexId,
        address subscriber,
        uint256 amount);
    
    /**
      * @dev Subscription distribution claimed event
      * @param token Super token address
      * @param subscriber The subscriber units updated
      * @param publisher Index publisher
      * @param indexId The specified indexId
      * @param amount The pending amount claimed
      */
    event SubscriptionDistributionClaimed(
        ISuperfluidToken indexed token,
        address indexed subscriber,
        address publisher,
        uint32 indexId,
        uint256 amount);

}