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// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "../interfaces/IMochiEngine.sol";
import "../interfaces/IERC3156FlashLender.sol";

contract USDM is ERC20, IUSDM {
    IMochiEngine public immutable engine;

    uint256 private constant SCALE = 1e18;

    bytes32 public constant CALLBACK_SUCCESS =
        keccak256("ERC3156FlashBorrower.onFlashLoan");

    constructor(address _engine) ERC20("USDM", "USDM") {
        engine = IMochiEngine(_engine);
    }

    modifier onlyMinter() {
        require(msg.sender == address(engine.minter()), "!minter");
        _;
    }

    function mint(address _recipient, uint256 _amount)
        external
        override
        onlyMinter
    {
        _mint(_recipient, _amount);
    }

    function burn(uint256 _amount) external override {
        _burn(msg.sender, _amount);
    }

    function maxFlashLoan(address _token)
        external
        view
        override
        returns (uint256)
    {
        require(_token == address(this), "!this");
        return type(uint256).max - totalSupply();
    }

    function flashFee(address _token, uint256 _amount)
        public
        view
        override
        returns (uint256)
    {
        //should return 0.1337% * _amount;
        require(_token == address(this), "!supported");
        return (_amount * ((1337 * SCALE) / 1000000)) / SCALE;
    }

    function flashLoan(
        IERC3156FlashBorrower _receiver,
        address _token,
        uint256 _amount,
        bytes calldata _data
    ) external override returns (bool) {
        require(_token == address(this), "!supported");
        uint256 fee = flashFee(_token, _amount);
        _mint(address(_receiver), _amount);
        require(
            _receiver.onFlashLoan(msg.sender, _token, _amount, fee, _data) ==
                CALLBACK_SUCCESS,
            "!callback"
        );
        _burn(address(_receiver), _amount);
        _transfer(address(_receiver), engine.treasury(), fee);
        return true;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @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 this function is
     * overridden;
     *
     * 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() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        return true;
    }

    /**
     * @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}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }

    /**
     * @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}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

import "@mochifi/vmochi/contracts/interfaces/IVMochi.sol";
import "@mochifi/cssr/contracts/interfaces/ICSSRRouter.sol";
import "./IMochiProfile.sol";
import "./IDiscountProfile.sol";
import "./IMochiVault.sol";
import "./IFeePool.sol";
import "./IReferralFeePool.sol";
import "./ILiquidator.sol";
import "./IUSDM.sol";
import "./IMochi.sol";
import "./IMinter.sol";
import "./IMochiNFT.sol";
import "./IMochiVaultFactory.sol";

interface IMochiEngine {
    function mochi() external view returns (IMochi);

    function vMochi() external view returns (IVMochi);

    function usdm() external view returns (IUSDM);

    function cssr() external view returns (ICSSRRouter);

    function governance() external view returns (address);

    function treasury() external view returns (address);

    function operationWallet() external view returns (address);

    function mochiProfile() external view returns (IMochiProfile);

    function discountProfile() external view returns (IDiscountProfile);

    function feePool() external view returns (IFeePool);

    function referralFeePool() external view returns (IReferralFeePool);

    function liquidator() external view returns (ILiquidator);

    function minter() external view returns (IMinter);

    function nft() external view returns (IMochiNFT);

    function vaultFactory() external view returns (IMochiVaultFactory);
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

import "./IERC3156FlashBorrower.sol";

interface IERC3156FlashLender {
    /**
     * @dev The amount of currency available to be lent.
     * @param token The loan currency.
     * @return The amount of `token` that can be borrowed.
     */
    function maxFlashLoan(address token) external view returns (uint256);

    /**
     * @dev The fee to be charged for a given loan.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @return The amount of `token` to be charged for the loan, on top of the returned principal.
     */
    function flashFee(address token, uint256 amount)
        external
        view
        returns (uint256);

    /**
     * @dev Initiate a flash loan.
     * @param receiver The receiver of the tokens in the loan, and the receiver of the callback.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @param data Arbitrary data structure, intended to contain user-defined parameters.
     */
    function flashLoan(
        IERC3156FlashBorrower receiver,
        address token,
        uint256 amount,
        bytes calldata data
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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 Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

interface IVMochi {
    function locked(address _user) external view returns(int128, uint256);
    function depositFor(address _user, uint256 _amount) external;
    function balanceOf(address _user) external view returns(uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@mochifi/library/contracts/Float.sol";

interface ICSSRRouter {
    function update(address _asset, bytes memory _data)
        external
        returns (float memory);

    function getPrice(address _asset) external view returns (float memory);

    function getLiquidity(address _asset) external view returns (uint256);
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

import "@mochifi/library/contracts/Float.sol";

enum AssetClass {
    Invalid,
    Stable,
    Alpha,
    Gamma,
    Delta,
    Zeta,
    Sigma,
    Revoked
}

interface IMochiProfile {
    function assetClass(address _asset) external view returns (AssetClass);

    function liquidityRequirement() external view returns (uint256);

    function minimumDebt() external view returns (uint256);

    function changeAssetClass(
        address[] calldata _asset,
        AssetClass[] calldata _class
    ) external;

    function changeLiquidityRequirement(uint256 _requirement) external;

    function changeMinimumDebt(uint256 _debt) external;

    function calculateFeeIndex(
        address _asset,
        uint256 _currentIndex,
        uint256 _lastAccrued
    ) external view returns (uint256);

    function creditCap(address _asset) external view returns (uint256);

    function delay() external view returns (uint256);

    function liquidationFactor(address _asset)
        external
        view
        returns (float memory);

    function maxCollateralFactor(address _asset)
        external
        view
        returns (float memory);

    function stabilityFee(address _asset) external view returns (float memory);

    function liquidationFee(address _asset)
        external
        view
        returns (float memory);

    function keeperFee(address _asset) external view returns (float memory);

    function utilizationRatio(address _asset)
        external
        view
        returns (float memory);
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

import "@mochifi/library/contracts/Float.sol";

interface IDiscountProfile {
    function discount(address _user) external view returns (float memory);
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
struct Detail {
    Status status;
    uint256 collateral;
    uint256 debt;
    uint256 debtIndex;
    address referrer;
}

enum Status {
    Invalid, // not minted
    Idle, // debt = 0, collateral = 0
    Collaterized, // debt = 0, collateral > 0
    Active, // debt > 0, collateral > 0
    Liquidated
}

interface IMochiVault {
    function liveDebtIndex() external view returns (uint256);

    function details(uint256 _nftId)
        external
        view
        returns (
            Status,
            uint256 collateral,
            uint256 debt,
            uint256 debtIndexe,
            address refferer
        );

    function status(uint256 _nftId) external view returns (Status);

    function asset() external view returns (IERC20);

    function deposits() external view returns (uint256);

    function debts() external view returns (uint256);

    function claimable() external view returns (int256);

    function currentDebt(uint256 _nftId) external view returns (uint256);

    function initialize(address _asset) external;

    function deposit(uint256 _nftId, uint256 _amount) external;

    function withdraw(
        uint256 _nftId,
        uint256 _amount,
        bytes memory _data
    ) external;

    function borrow(
        uint256 _nftId,
        uint256 _amount,
        bytes memory _data
    ) external;

    function repay(uint256 _nftId, uint256 _amount) external;

    function liquidate(
        uint256 _nftId,
        uint256 _collateral,
        uint256 _usdm
    ) external;
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

interface IFeePool {
    function updateReserve() external;
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

interface IReferralFeePool {
    function addReward(address _recipient) external;
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

interface ILiquidator {
    event Triggered(uint256 _auctionId, uint256 _price);
    event Settled(uint256 _auctionId, uint256 _price);

    function triggerLiquidation(address _asset, uint256 _nftId) external;
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./IERC3156FlashLender.sol";

interface IUSDM is IERC20, IERC3156FlashLender {
    function mint(address _recipient, uint256 _amount) external;

    function burn(uint256 _amount) external;
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IMochi is IERC20 {}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

interface IMinter {
    function mint(address _to, uint256 _amount) external;

    function hasPermission(address _user) external view returns (bool);
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol";

interface IMochiNFT is IERC721Enumerable {
    struct MochiInfo {
        address asset;
    }

    function asset(uint256 _id) external view returns (address);

    function mint(address _asset, address _owner) external returns (uint256);
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

import "./IMochiVault.sol";

interface IMochiVaultFactory {
    function updateTemplate(address _template) external;

    function deployVault(address _asset) external returns (IMochiVault);

    function getVault(address _asset) external view returns (IMochiVault);
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

struct float {
    uint256 numerator;
    uint256 denominator;
}

library Float {
    function multiply(uint256 a, float memory f) internal pure returns(uint256) {
        require(f.denominator != 0, "div 0");
        return a * f.numerator / f.denominator;
    }

    function inverse(float memory f) internal pure returns(float memory) {
        require(f.numerator != 0 && f.denominator != 0, "div 0");
        return float({
            numerator: f.denominator,
            denominator: f.numerator
        });
    }

    function divide(uint256 a, float memory f) internal pure returns(uint256) {
        require(f.denominator != 0, "div 0");
        return a * f.denominator / f.numerator;
    }

    function add(float memory a, float memory b) internal pure returns(float memory res) {
        require(a.denominator != 0 && b.denominator != 0, "div 0");
        res = float({
            numerator : a.numerator*b.denominator + a.denominator*b.numerator,
            denominator : a.denominator*b.denominator
        });
        if(res.numerator > 2**128 && res.denominator > 2**128){
            res.numerator = res.numerator / 2**64;
            res.denominator = res.denominator / 2**64;
        }
    }
    
    function sub(float memory a, float memory b) internal pure returns(float memory res) {
        require(a.denominator != 0 && b.denominator != 0, "div 0");
        res = float({
            numerator : a.numerator*b.denominator - b.numerator*a.denominator,
            denominator : a.denominator*b.denominator
        });
        if(res.numerator > 2**128 && res.denominator > 2**128){
            res.numerator = res.numerator / 2**64;
            res.denominator = res.denominator / 2**64;
        }
    }

    function mul(float memory a, float memory b) internal pure returns(float memory res) {
        require(a.denominator != 0 && b.denominator != 0, "div 0");
        res = float({
            numerator : a.numerator * b.numerator,
            denominator : a.denominator * b.denominator
        });
        if(res.numerator > 2**128 && res.denominator > 2**128){
            res.numerator = res.numerator / 2**64;
            res.denominator = res.denominator / 2**64;
        }
    }

    function gt(float memory a, float memory b) internal pure returns(bool) {
        require(a.denominator != 0 && b.denominator != 0, "div 0");
        return a.numerator * b.denominator > a.denominator * b.numerator;
    }

    function lt(float memory a, float memory b) internal pure returns(bool) {
        require(a.denominator != 0 && b.denominator != 0, "div 0");
        return a.numerator * b.denominator < a.denominator * b.numerator;
    }

    function gte(float memory a, float memory b) internal pure returns(bool) {
        require(a.denominator != 0 && b.denominator != 0, "div 0");
        return a.numerator * b.denominator >= a.denominator * b.numerator;
    }

    function lte(float memory a, float memory b) internal pure returns(bool) {
        require(a.denominator != 0 && b.denominator != 0, "div 0");
        return a.numerator * b.denominator <= a.denominator * b.numerator;
    }

    function equals(float memory a, float memory b) internal pure returns(bool) {
        require(a.denominator != 0 && b.denominator != 0, "div 0");
        return a.numerator * b.denominator == b.numerator * a.denominator;
    }
}

// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

interface IERC3156FlashBorrower {
    /**
     * @dev Receive a flash loan.
     * @param initiator The initiator of the loan.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @param fee The additional amount of tokens to repay.
     * @param data Arbitrary data structure, intended to contain user-defined parameters.
     * @return The keccak256 hash of "ERC3156FlashBorrower.onFlashLoan"
     */
    function onFlashLoan(
        address initiator,
        address token,
        uint256 amount,
        uint256 fee,
        bytes calldata data
    ) external returns (bytes32);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// SPDX-License-Identifier: MIT

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`, 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 be 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: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * 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 Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @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 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);

    /**
     * @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;
}

// SPDX-License-Identifier: MIT

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);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "bytecodeHash": "none"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000860e47e6d6f4a6bcaaddfc7f17f772d2ab55be2f

-----Decoded View---------------
Arg [0] : _engine (address): 0x860E47e6D6f4a6bCAADDFC7f17F772d2ab55bE2f

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000860e47e6d6f4a6bcaaddfc7f17f772d2ab55be2f