Address Details

contract

//SPDX-License-Identifier: Apache-2.0
pragma solidity 0.8.4;

import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
import "./interfaces/MicrocreditStorageV1.sol";

contract MicrocreditImplementation is
    Initializable,
    OwnableUpgradeable,
    PausableUpgradeable,
    ReentrancyGuardUpgradeable,
    MicrocreditStorageV1
{
    using SafeERC20Upgradeable for IERC20;
    using EnumerableSet for EnumerableSet.AddressSet;

    event ManagerAdded(address indexed managerAddress);

    event ManagerRemoved(address indexed managerAddress);

    event LoanAdded(
        address indexed userAddress,
        uint256 loanId,
        uint256 amount,
        uint256 period,
        uint256 dailyInterest,
        uint256 claimDeadline
    );

    event LoanCanceled(address indexed userAddress, uint256 loanId);

    event UserAddressChanged(address indexed oldWalletAddress, address indexed newWalletAddress);

    event LoanClaimed(address indexed userAddress, uint256 loanId);

    event RepaymentAdded(
        address indexed userAddress,
        uint256 loanId,
        uint256 repaymentAmount,
        uint256 currentDebt
    );

    modifier onlyManagers() {
        require(_managerList.contains(msg.sender), "Microcredit: caller is not a manager");
        _;
    }

    /**
     * @notice Used to initialize the Microcredit contract
     *
     * @param _cUSDAddress      The address of the cUSD token
     * @param _revenueAddress   The address that collects all the interest
     */
    function initialize(address _cUSDAddress, address _revenueAddress) public initializer {
        __Ownable_init();
        __Pausable_init();
        __ReentrancyGuard_init();

        cUSD = IERC20(_cUSDAddress);
        revenueAddress = _revenueAddress;
    }

    /**
     * @notice Returns the current implementation version
     */
    function getVersion() external pure override returns (uint256) {
        return 1;
    }

    /**
     * @notice Returns the information of a user
     *
     * @param _userAddress           address of the user
     * @return userId                the userId
     * @return movedTo               the number of the user's loans
     * @return loansLength           the number of the user's loans
     */
    function walletMetadata(address _userAddress)
        external
        view
        override
        returns (
            uint256 userId,
            address movedTo,
            uint256 loansLength
        )
    {
        WalletMetadata memory _metadata = _walletMetadata[_userAddress];

        userId = _metadata.userId;
        movedTo = _metadata.movedTo;
        loansLength = _users[_metadata.userId].loans.length;
    }

    /**
     * @notice Returns the length of the walletList
     */
    function walletListLength() external view override returns (uint256) {
        return _walletList.length();
    }

    /**
     * @notice Returns an address from the walletList
     *
     * @param _index index value
     * @return address of the user
     */
    function walletListAt(uint256 _index) external view override returns (address) {
        return _walletList.at(_index);
    }

    /**
     * @notice Returns an address from the managerList
     *
     * @param _index index value
     * @return address of the manager
     */
    function managerListAt(uint256 _index) external view override returns (address) {
        return _managerList.at(_index);
    }

    /**
     * @notice Returns the length of the managerList
     */
    function managerListLength() external view override returns (uint256) {
        return _managerList.length();
    }

    function userLoans(address _userAddress, uint256 _loanId)
        external
        view
        override
        returns (
            uint256 amountBorrowed,
            uint256 period,
            uint256 dailyInterest,
            uint256 claimDeadline,
            uint256 startDate,
            uint256 currentDebt,
            uint256 lastComputedDebt,
            uint256 amountRepayed,
            uint256 repaymentsLength,
            uint256 lastComputedDate
        )
    {
        _checkUserLoan(_userAddress, _loanId);

        WalletMetadata memory _metadata = _walletMetadata[_userAddress];
        User memory _user = _users[_metadata.userId];
        Loan memory _loan = _user.loans[_loanId];

        amountBorrowed = _loan.amountBorrowed;
        period = _loan.period;
        dailyInterest = _loan.dailyInterest;
        claimDeadline = _loan.claimDeadline;
        startDate = _loan.startDate;
        lastComputedDebt = _loan.lastComputedDebt;
        currentDebt = _calculateCurrentDebt(_loan);
        amountRepayed = _loan.amountRepayed;
        repaymentsLength = _loan.repayments.length;
        lastComputedDate = _loan.lastComputedDate;
    }

    function userLoanRepayments(
        address _userAddress,
        uint256 _loanId,
        uint256 _repaymentId
    ) external view override returns (uint256 date, uint256 amount) {
        _checkUserLoan(_userAddress, _loanId);

        WalletMetadata memory _metadata = _walletMetadata[_userAddress];
        User memory _user = _users[_metadata.userId];
        Loan memory _loan = _user.loans[_loanId];

        require(_loan.repayments.length > _repaymentId, "Microcredit: Repayment doesn't exist");

        date = _loan.repayments[_repaymentId].date;
        amount = _loan.repayments[_repaymentId].amount;
    }

    function updateRevenueAddress(address _newRevenueAddress) external override onlyOwner {
        revenueAddress = _newRevenueAddress;
    }

    function addManagers(address[] calldata _managerAddresses) external override onlyOwner {
        uint256 _length = _managerAddresses.length;
        uint256 _index;

        for (_index = 0; _index < _length; _index++) {
            _managerList.add(_managerAddresses[_index]);
            emit ManagerAdded(_managerAddresses[_index]);
        }
    }

    function removeManagers(address[] calldata _managerAddresses) external override onlyOwner {
        uint256 _length = _managerAddresses.length;
        uint256 _index;

        for (_index = 0; _index < _length; _index++) {
            _managerList.remove(_managerAddresses[_index]);
            emit ManagerRemoved(_managerAddresses[_index]);
        }
    }

    function addLoan(
        address _userAddress,
        uint256 _amount,
        uint256 _period,
        uint256 _dailyInterest,
        uint256 _claimDeadline
    ) external override onlyManagers {
        _addLoan(_userAddress, _amount, _period, _dailyInterest, _claimDeadline);
    }

    function addLoans(
        address[] calldata _userAddresses,
        uint256[] calldata _amounts,
        uint256[] calldata _periods,
        uint256[] calldata _dailyInterests,
        uint256[] calldata _claimDeadlines
    ) external override onlyManagers {
        uint256 _loansNumber = _userAddresses.length;
        require(
            _loansNumber == _amounts.length,
            "Microcredit: calldata information arity mismatch"
        );
        require(
            _loansNumber == _periods.length,
            "Microcredit: calldata information arity mismatch"
        );
        require(
            _loansNumber == _dailyInterests.length,
            "Microcredit: calldata information arity mismatch"
        );
        require(
            _loansNumber == _claimDeadlines.length,
            "Microcredit: calldata information arity mismatch"
        );

        uint256 _index;

        for (_index = 0; _index < _loansNumber; _index++) {
            _addLoan(
                _userAddresses[_index],
                _amounts[_index],
                _periods[_index],
                _dailyInterests[_index],
                _claimDeadlines[_index]
            );
        }
    }

    function cancelLoans(address[] calldata _userAddresses, uint256[] calldata _loansIds)
        external
        override
        onlyManagers
    {
        require(
            _userAddresses.length == _loansIds.length,
            "Microcredit: calldata information arity mismatch"
        );

        uint256 _index;

        for (_index = 0; _index < _userAddresses.length; _index++) {
            _cancelLoan(_userAddresses[_index], _loansIds[_index]);
        }
    }

    function changeUserAddress(address _oldWalletAddress, address _newWalletAddress)
        external
        override
        onlyManagers
    {
        WalletMetadata storage _oldWalletMetadata = _walletMetadata[_oldWalletAddress];
        require(
            _oldWalletMetadata.userId > 0 && _oldWalletMetadata.movedTo == address(0),
            "Microcredit: This user cannot be moved"
        );

        WalletMetadata storage _newWalletMetadata = _walletMetadata[_newWalletAddress];
        require(_newWalletMetadata.userId == 0, "Microcredit: Target wallet address is invalid");

        _oldWalletMetadata.movedTo = _newWalletAddress;
        _newWalletMetadata.userId = _oldWalletMetadata.userId;

        _walletList.add(_newWalletAddress);

        emit UserAddressChanged(_oldWalletAddress, _newWalletAddress);
    }

    function claimLoan(uint256 _loanId) external override nonReentrant {
        _checkUserLoan(msg.sender, _loanId);

        WalletMetadata memory _metadata = _walletMetadata[msg.sender];
        User storage _user = _users[_metadata.userId];
        Loan storage _loan = _user.loans[_loanId];

        require(_loan.startDate == 0, "Microcredit: Loan already claimed");
        require(_loan.claimDeadline != 0, "Microcredit: Loan canceled");
        require(_loan.claimDeadline >= block.timestamp, "Microcredit: Loan expired");

        _loan.startDate = block.timestamp;

        _loan.lastComputedDebt = (_loan.amountBorrowed * (1e18 + _loan.dailyInterest / 100)) / 1e18;
        _loan.lastComputedDate = block.timestamp;

        cUSD.safeTransfer(msg.sender, _loan.amountBorrowed);

        emit LoanClaimed(msg.sender, _loanId);
    }

    function repayLoan(uint256 _loanId, uint256 _repaymentAmount) external override nonReentrant {
        require(_repaymentAmount > 0, "Microcredit: Invalid amount");

        _checkUserLoan(msg.sender, _loanId);

        WalletMetadata memory _metadata = _walletMetadata[msg.sender];
        User storage _user = _users[_metadata.userId];
        Loan storage _loan = _user.loans[_loanId];

        require(_loan.startDate > 0, "Microcredit: Loan not claimed");
        require(_loan.lastComputedDebt > 0, "Microcredit: Loan has already been fully repayed");

        uint256 _currentDebt = _calculateCurrentDebt(_loan);

        if (_currentDebt < _repaymentAmount) {
            _repaymentAmount = _currentDebt;
        }

        uint256 _revenueAmount;
        uint256 _loanAmount;

        if (
            _loan.amountRepayed + _repaymentAmount <= _loan.amountBorrowed ||
            revenueAddress == address(0)
        ) {
            //all repaymentAmount should go to microcredit address
            cUSD.safeTransferFrom(msg.sender, address(this), _repaymentAmount);
        } else if (_loan.amountRepayed >= _loan.amountBorrowed) {
            //all repaymentAmount should go to revenue address
            cUSD.safeTransferFrom(msg.sender, revenueAddress, _repaymentAmount);
        } else {
            //a part of the repayment should go to microcredit address and the rest should go to the revenue address
            uint256 _loanDiff = _loan.amountBorrowed - _loan.amountRepayed;
            cUSD.safeTransferFrom(msg.sender, address(this), _loanDiff);
            cUSD.safeTransferFrom(msg.sender, revenueAddress, _repaymentAmount - _loanDiff);
        }

        Repayment storage _repayment = _loan.repayments.push();
        _repayment.date = block.timestamp;
        _repayment.amount = _repaymentAmount;

        _loan.lastComputedDebt = _currentDebt - _repaymentAmount;
        _loan.amountRepayed += _repaymentAmount;

        uint256 _days = (block.timestamp - _loan.lastComputedDate) / 86400; //86400 = 1 day in seconds

        _loan.lastComputedDate = _loan.lastComputedDate + _days * 86400;

        emit RepaymentAdded(msg.sender, _loanId, _repaymentAmount, _loan.lastComputedDebt);
    }

    /**
     * @notice Transfers an amount of an ERC20 from this contract to an address
     *
     * @param _token address of the ERC20 token
     * @param _to address of the receiver
     * @param _amount amount of the transaction
     */
    function transferERC20(
        IERC20 _token,
        address _to,
        uint256 _amount
    ) external override nonReentrant onlyOwner {
        _token.safeTransfer(_to, _amount);
    }

    function _checkUserLoan(address _userAddress, uint256 _loanId) internal view {
        WalletMetadata memory _metadata = _walletMetadata[_userAddress];

        require(
            _metadata.userId > 0 && _metadata.movedTo == address(0),
            "Microcredit: Invalid wallet address"
        );

        User memory _user = _users[_metadata.userId];

        require(_user.loans.length > _loanId, "Microcredit: Loan doesn't exist");
    }

    function _calculateCurrentDebt(Loan memory _loan) internal view returns (uint256) {
        if (_loan.lastComputedDebt == 0) {
            return 0;
        }

        uint256 _days = (block.timestamp - _loan.lastComputedDate) / 86400; //86400 = 1 day in seconds

        uint256 _currentDebt = _loan.lastComputedDebt;

        while (_days > 0) {
            _currentDebt = (_currentDebt * (1e18 + _loan.dailyInterest / 100)) / 1e18;
            _days--;
        }

        return _currentDebt;
    }

    function _addLoan(
        address _userAddress,
        uint256 _amount,
        uint256 _period,
        uint256 _dailyInterest,
        uint256 _claimDeadline
    ) internal {
        require(_claimDeadline > block.timestamp, "Microcredit: invalid claimDeadline");

        WalletMetadata storage _metadata = _walletMetadata[_userAddress];
        require(_metadata.movedTo == address(0), "Microcredit: The user has been moved");

        if (_metadata.userId == 0) {
            _usersLength++;
            _metadata.userId = _usersLength;
            _walletList.add(_userAddress);
        }

        User storage _user = _users[_metadata.userId];

        uint256 _loansLength = _user.loans.length;

        if (_loansLength > 0) {
            Loan memory _previousLoan = _user.loans[_loansLength - 1];
            require(
                (_previousLoan.startDate > 0 && _previousLoan.lastComputedDebt == 0) || // loan claimed and fully paid
                    (_previousLoan.startDate == 0 &&
                        _previousLoan.claimDeadline < block.timestamp) || //loan unclaimed and expired
                    (_previousLoan.claimDeadline == 0), //loan canceled
                "Microcredit: The user already has an active loan"
            );
        }

        Loan storage _loan = _user.loans.push();

        _loan.amountBorrowed = _amount;
        _loan.period = _period;
        _loan.dailyInterest = _dailyInterest;
        _loan.claimDeadline = _claimDeadline;

        emit LoanAdded(
            _userAddress,
            _user.loans.length - 1,
            _amount,
            _period,
            _dailyInterest,
            _claimDeadline
        );
    }

    function _cancelLoan(address _userAddress, uint256 _loanId) internal {
        _checkUserLoan(_userAddress, _loanId);

        WalletMetadata memory _metadata = _walletMetadata[_userAddress];
        User storage _user = _users[_metadata.userId];
        Loan storage _loan = _user.loans[_loanId];

        require(_loan.startDate == 0, "Microcredit: Loan already claimed");
        require(_loan.claimDeadline != 0, "Microcredit: Loan already canceled");

        _loan.claimDeadline = 0; //set claimDeadline to 0 to prevent claiming (cancel the loan)

        emit LoanCanceled(_userAddress, _loanId);
    }
}
        

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

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastvalue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastvalue;
                // Update the index for the moved value
                set._indexes[lastvalue] = valueIndex; // Replace lastvalue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        return _values(set._inner);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        assembly {
            result := store
        }

        return result;
    }
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
    uint256[49] private __gap;
}
          

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

pragma solidity ^0.8.0;

import "../../utils/AddressUpgradeable.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 a proxied contract can't have 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.
 *
 * 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 initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

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

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

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

    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract PausableUpgradeable is Initializable, ContextUpgradeable {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    function __Pausable_init() internal onlyInitializing {
        __Context_init_unchained();
        __Pausable_init_unchained();
    }

    function __Pausable_init_unchained() internal onlyInitializing {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
    uint256[49] private __gap;
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuardUpgradeable is Initializable {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    function __ReentrancyGuard_init() internal onlyInitializing {
        __ReentrancyGuard_init_unchained();
    }

    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
    uint256[49] private __gap;
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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);
}
          

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";
import "../../../utils/AddressUpgradeable.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20Upgradeable {
    using AddressUpgradeable for address;

    function safeTransfer(
        IERC20Upgradeable token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20Upgradeable token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20Upgradeable token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20Upgradeable token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}
          

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

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 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 functionCall(target, data, "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");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(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) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason 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 {
            // 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

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
          

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

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
    uint256[50] private __gap;
}
          

//SPDX-License-Identifier: Apache-2.0
pragma solidity 0.8.4;

import {IERC20Upgradeable as IERC20} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";

interface IMicrocredit {
    struct WalletMetadata {
        uint256 userId;
        address movedTo;
    }

    struct User {
        Loan[] loans;
    }

    struct Repayment {
        uint256 date;
        uint256 amount;
    }

    struct Loan {
        uint256 amountBorrowed;
        uint256 period;                   // the number of seconds after a loan should be fully repaid
        uint256 dailyInterest;
        uint256 claimDeadline;
        uint256 startDate;                // the timestamp the user claimed the amountBorrowed
        uint256 lastComputedDebt;
        uint256 amountRepayed;
        Repayment[] repayments;
        uint256 lastComputedDate;
    }

    function getVersion() external pure returns(uint256);
    function cUSD() external view returns(IERC20);
    function revenueAddress() external view returns(address);
    function walletMetadata(address userAddress)
        external view returns(uint256 userId, address movedTo, uint256 loansLength);
    function userLoans(address userAddress, uint256 loanId) external view returns(
        uint256 amountBorrowed,
        uint256 period,
        uint256 dailyInterest,
        uint256 claimDeadline,
        uint256 startDate,
        uint256 lastComputedDebt,
        uint256 currentDebt,
        uint256 amountRepayed,
        uint256 repaymentsLength,
        uint256 lastComputedDate
    );
    function userLoanRepayments(address userAddress, uint256 loanId, uint256 repaymentId)
        external view returns( uint256 date, uint256 amount);
    function walletListAt(uint256 index) external view returns (address);
    function walletListLength() external view returns (uint256);
    function managerListAt(uint256 index) external view returns (address);
    function managerListLength() external view returns (uint256);
    function updateRevenueAddress(address newRevenueAddress) external;
    function addManagers(address[] calldata managerAddresses) external;
    function removeManagers(address[] calldata managerAddresses) external;
    function addLoan(
        address userAddress,
        uint256 amount,
        uint256 period,
        uint256 dailyInterest,
        uint256 claimDeadline
    ) external;
    function addLoans(
        address[] calldata userAddresses,
        uint256[] calldata amounts,
        uint256[] calldata periods,
        uint256[] calldata dailyInterests,
        uint256[] calldata claimDeadlines
    ) external;
    function cancelLoans(
        address[] calldata userAddresses,
        uint256[] calldata loansIds
    ) external;
    function changeUserAddress(address oldWalletAddress, address newWalletAddress) external;
    function claimLoan(uint256 loanId) external;
    function repayLoan(uint256 loanId, uint256 repaymentAmount) external;
    function transferERC20(IERC20 _token, address _to, uint256 _amount) external;
}
          

// SPDX-License-Identifier: Apache-2.0
pragma solidity 0.8.4;

import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import "./IMicrocredit.sol";

/**
 * @title Storage for Microcredit
 * @notice For future upgrades, do not change MicrocreditStorageV1. Create a new
 * contract which implements MicrocreditStorageV1 and following the naming convention
 * MicrocreditStorageVx.
 */
abstract contract MicrocreditStorageV1 is IMicrocredit {
    IERC20 public override cUSD;

    uint256 internal  _usersLength;
    mapping(uint256 => User) internal _users;

    mapping(address => WalletMetadata) internal _walletMetadata;
    EnumerableSet.AddressSet internal _walletList;

    EnumerableSet.AddressSet internal _managerList;
    address public override revenueAddress;
}