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

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "contracts/interfaces/IOTOKEN.sol";
import "contracts/interfaces/IVTOKEN.sol";
import "contracts/interfaces/IOTOKENFactory.sol";
import "contracts/interfaces/IVTOKENFactory.sol";
import "contracts/interfaces/ITOKENFeesFactory.sol";

/**
 * @title TOKEN Bonding Curve
 * @author akita
 * 
 * This contract governs the price dynamics of an ERC20 TOKEN via a dual bonding curve mechanism:
 * 1. A fixed-price curve, y = c, where the TOKEN price is invariant at 1 BASE/TOKEN (the floor price). 
 *    TOKENs are minted from floor reserves by exercising OTOKEN call options equivalent to the BASE amount. 
 *    TOKENs can be consistently redeemed from floor reserves at the floor price.
 * 2. A variable-price curve that employs the xy=k formula for TOKEN price discovery. An initial TOKEN supply 
 *    is minted into market reserves, balanced by a corresponding quantity of virtual BASE. TOKEN pricing on the 
 *    market reserves spans a range of 1 BASE/TOKEN (lower bound) to infinity BASE/TOKEN (upper bound). The market 
 *    reserve facilitates the buying and selling of TOKENs.
 * 
 * The integration of these reserves forms the comprehensive bonding curve for the TOKEN.
 *  _____________________
 * |           |        /|
 * |           |       / |
 * |           |      /  |
 * |           |     /   |
 * |           |    /    |
 * |           |   /     |
 * |           |  /      |
 * |           | /       |
 * |___________|/        |
 * | FLOOR     | MARKET  |
 * | RESERVE   | RESERVE |
 * |___________|_________|
 * |<----Cf--->|<---Cm-->|
 *
 * The constructs of floor reserves and market reserves underpin this contract.
 * Floor reserves are BASE pools allowing TOKEN redemption at a static floor price. 
 * TOKENs are exclusively minted from floor reserves via exercising OTOKEN call options using BASE.
 * Market reserves incorporate variable amounts of BASE and TOKEN subjected to market-driven pricing 
 * derived from a virtual xy=k invariant. An initial TOKEN supply is minted into the market reserves, 
 * with an equal virtual BASE reserve amount. TOKEN pricing in the market reserves varies from a minimum 
 * of 1 BASE/TOKEN (floor price) to an upper limit of infinity BASE/TOKEN.
 * 
 * The contract is designed to interact with external contracts including: OTOKEN, VTOKEN, and a FEES contract. 
 * It is also equipped to levy protocol and UI hosting provider fees. The TOKEN's initial supply is minted to the 
 * bonding curve balanced by an equal amount of virtual BASE. For the bonding curve to operate correctly, BASE must 
 * be an 18 decimal ERC20 token.
 */
contract TOKEN is ERC20, ReentrancyGuard {
    using SafeERC20 for IERC20;

    /*===================================================================*/
    /*===========================  SETTINGS  ============================*/

    string internal constant NAME = 'Hen';     // Name of TOKEN
    string internal constant SYMBOL = 'HEN';       // Symbol of TOKEN

    uint256 public constant PROTOCOL_FEE = 50;      // Swap and borrow fee: buy, sell, borrow
    uint256 public constant PROVIDER_FEE = 4000;    // Fee for the UI hosting provider

    /*===========================  END SETTINGS  ========================*/
    /*===================================================================*/

    /*----------  CONSTANTS  --------------------------------------------*/

    uint256 public constant DIVISOR = 10000;        // Divisor for fee calculation
    uint256 public constant FLOOR_PRICE = 1e18;     // Floor price of TOKEN in BASE
    uint256 public constant PRECISION = 1e18;       // Precision
    uint8 public constant DECIMALS = 18;            // Required BASE decimals

    /*----------  STATE VARIABLES  --------------------------------------*/

    // Address state variables
    IERC20 public immutable BASE;       // ERC20 token that backs TOKEN with liquidity in Bonding Curve. Must be 18 decimals
    address public immutable OTOKEN;    // Call option on TOKEN that can be exercised at the floor price of the bonding curve
    address public immutable VTOKEN;    // Staking contract for TOKEN to earn fees, rewards, voting power, and collateral for loans
    address public immutable FEES;      // Fees contract collects fees swaps and loans to distribute through rewarder

    // Bonding Curve state variables
    uint256 public frBASE;              // floor reserve BASE
    uint256 public immutable mrvBASE;   // market reserve virtual BASE, also is the max amount of TOKEN allowed in the market reserve
    uint256 public mrrBASE;             // market reserve real BASE
    uint256 public mrrTOKEN;            // market reserve real TOKEN

    // Lending state variables
    uint256 public debtTotal;                               // total debt in BASE owed to the bonding curve
    mapping(address => uint256) public debts;               // debt in BASE owed to the bonding curve per account

    /*----------  ERRORS ------------------------------------------------*/

    error TOKEN__InvalidDecimals();
    error TOKEN__InvalidZeroInput();
    error TOKEN__SwapExpired();
    error TOKEN__ExceedsSwapSlippageTolerance();
    error TOKEN__ExceedsSwapMarketReserves();
    error TOKEN__ExceedsBorrowCreditLimit();
    error TOKEN__InvalidZeroAddress();

    /*----------  EVENTS ------------------------------------------------*/

    event TOKEN__Buy(address indexed account, address indexed to, uint256 amount);
    event TOKEN__Sell(address indexed account, address indexed to, uint256 amount);
    event TOKEN__Exercise(address indexed account, address indexed to, uint256 amount);
    event TOKEN__Redeem(address indexed account, address indexed to, uint256 amount);
    event TOKEN__Borrow(address indexed account, uint256 amount);
    event TOKEN__Repay(address indexed account, uint256 amount);

    /*----------  MODIFIERS  --------------------------------------------*/

    modifier nonZeroInput(uint256 _amount) {
        if (_amount == 0) revert TOKEN__InvalidZeroInput();
        _;
    }

    modifier nonExpiredSwap(uint256 expireTimestamp) {
        if (expireTimestamp < block.timestamp) revert TOKEN__SwapExpired();
        _;
    }

    modifier nonZeroAddress(address _account) {
        if (_account == address(0)) revert TOKEN__InvalidZeroAddress();
        _;
    }

    /*----------  FUNCTIONS  --------------------------------------------*/

    /**
     * @notice Construct a new TOKEN Bonding Curve. TOKEN and BASE reserves will be equal.
     *         The initial supply of TOKEN will be minted to the bonding curve with an equal amount of virtual BASE.
     * @dev The BASE must be an 18 decimal ERC20 token, otherwise the bonding curve will not function correctly
     * @param _BASE The ERC20 in the bonding curve reserves
     * @param _supplyTOKEN The initial supply of TOKEN to mint to the bonding curve
     * @param _OTOKENFactory The factory contract to create the OTOKEN
     * @param _VTOKENFactory The factory contract to create the VTOKEN
     * @param _VTOKENRewarderFactory The factory contract to create the VTOKENRewarder
     * @param _TOKENFeesFactory The factory contract to create the TOKENFees
     */
    constructor(
        address _BASE, 
        uint256 _supplyTOKEN, 
        address _OTOKENFactory, 
        address _VTOKENFactory, 
        address _VTOKENRewarderFactory, 
        address _TOKENFeesFactory
    )
        ERC20(NAME, SYMBOL)
        nonZeroAddress(_BASE)
        nonZeroInput(_supplyTOKEN)
    {
        if (IERC20Metadata(_BASE).decimals() != DECIMALS) revert TOKEN__InvalidDecimals();
        address _owner = msg.sender;
        BASE = IERC20(_BASE);
        mrvBASE = _supplyTOKEN;
        mrrTOKEN = _supplyTOKEN;
        OTOKEN = IOTOKENFactory(_OTOKENFactory).createOToken(_owner);
        (address vToken, address rewarder) = IVTOKENFactory(_VTOKENFactory).createVToken(address(this), OTOKEN, _VTOKENRewarderFactory, _owner);
        VTOKEN = vToken;
        FEES = ITOKENFeesFactory(_TOKENFeesFactory).createTokenFees(rewarder, address(this), _BASE, OTOKEN);
    }

    /**
     * @notice Buy TOKEN from the bonding curve market reserves with BASE
     * @param amountBase Amount of BASE to spend
     * @param minToken Minimum amount of TOKEN to receive, reverts when outTOKEN < minToken
     * @param expireTimestamp Expiration timestamp of the swap, reverts when block.timestamp > expireTimestamp
     * @param toAccount Account address to receive TOKEN
     * @param provider Account address (UI provider) to receive provider fee, address(0) does not take a fee
     * @return bool true=success, otherwise false
     */
    function buy(uint256 amountBase, uint256 minToken, uint256 expireTimestamp, address toAccount, address provider) 
        external
        nonReentrant
        nonZeroInput(amountBase)
        nonExpiredSwap(expireTimestamp)
        returns (bool)
    {
        uint256 feeBASE = amountBase * PROTOCOL_FEE / DIVISOR;
        uint256 newMrBASE = (mrvBASE + mrrBASE) + amountBase - feeBASE;
        uint256 newMrTOKEN = (mrvBASE + mrrBASE) * mrrTOKEN / newMrBASE;
        uint256 outTOKEN = mrrTOKEN - newMrTOKEN;

        if (outTOKEN < minToken) revert TOKEN__ExceedsSwapSlippageTolerance();

        mrrBASE = newMrBASE - mrvBASE;
        mrrTOKEN = newMrTOKEN;

        emit TOKEN__Buy(msg.sender, toAccount, amountBase);

        if (provider != address(0)) {
            uint256 providerFee = feeBASE * PROVIDER_FEE / DIVISOR;
            BASE.safeTransferFrom(msg.sender, provider, providerFee);
            BASE.safeTransferFrom(msg.sender, FEES, feeBASE - providerFee);
        } else {
            BASE.safeTransferFrom(msg.sender, FEES, feeBASE);
        }
        IERC20(BASE).safeTransferFrom(msg.sender, address(this), amountBase - feeBASE);
        _mint(toAccount, outTOKEN);
        return true;
    }

    /**
     * @notice Sell TOKEN to the bonding curve market reserves for BASE
     * @param amountToken Amount of TOKEN to spend
     * @param minBase Minimum amount of BASE to receive, reverts when outBase < minBase
     * @param expireTimestamp Expiration timestamp of the swap, reverts when block.timestamp > expireTimestamp
     * @param toAccount Account address to receive BASE
     * @param provider Account address (UI provider) to receive provider fee, address(0) does not take a fee
     * @return bool true=success, otherwise false
     */
    function sell(uint256 amountToken, uint256 minBase, uint256 expireTimestamp, address toAccount, address provider) 
        external
        nonReentrant
        nonZeroInput(amountToken)
        nonExpiredSwap(expireTimestamp)
        returns (bool)
    {
        if (amountToken > getMaxSell()) revert TOKEN__ExceedsSwapMarketReserves();
        uint256 feeTOKEN = amountToken * PROTOCOL_FEE / DIVISOR;
        uint256 newMrTOKEN = mrrTOKEN + amountToken - feeTOKEN;
        uint256 newMrBASE = (mrvBASE + mrrBASE) * mrrTOKEN / newMrTOKEN;
        uint256 outBASE = (mrvBASE + mrrBASE) - newMrBASE;

        if (outBASE < minBase) revert TOKEN__ExceedsSwapSlippageTolerance();

        mrrBASE = newMrBASE - mrvBASE;
        mrrTOKEN = newMrTOKEN;

        emit TOKEN__Sell(msg.sender, toAccount, amountToken);

        if (provider != address(0)) {
            uint256 providerFee = feeTOKEN * PROVIDER_FEE / DIVISOR;
            IERC20(address(this)).transferFrom(msg.sender, provider, providerFee);
            IERC20(address(this)).transferFrom(msg.sender, FEES, feeTOKEN - providerFee);
        } else {
            IERC20(address(this)).transferFrom(msg.sender, FEES, feeTOKEN);
        }
        _burn(msg.sender, amountToken - feeTOKEN); 
        BASE.safeTransfer(toAccount, outBASE);
        return true;
    }

    /**
     * @notice Exercise equal amounts of OTOKEN with BASE to receive and an equal amount of TOKEN. 
     *         OTOKEN is a call option with no expiry that can be exercised to purchase TOKEN 
     *         with BASE at the constant floor price from the floor reserves.
     * @param amountOToken Amount of OTOKEN to exercise, an equal amount of BASE will be required
     * @param toAccount Account address to receive TOKEN
     * @return bool true=success, otherwise false
     */
    function exercise(uint256 amountOToken, address toAccount) 
        external
        nonReentrant
        nonZeroInput(amountOToken)
        returns (bool)
    {
        address account = msg.sender;
        frBASE += amountOToken;
        _mint(toAccount, amountOToken);
        emit TOKEN__Exercise(account, toAccount, amountOToken);
        IOTOKEN(OTOKEN).burnFrom(account, amountOToken);
        BASE.safeTransferFrom(account, address(this), amountOToken);
        return true;
    }

    /**
     * @notice Redeem TOKEN for an equal amount of BASE from the floor reserves at the constant floor price
     * @param amountToken Amount of TOKEN to redeem, an equal amount of BASE will be received
     * @param toAccount Account address to receive BASE
     * @return bool true=success, otherwise false
     */
    function redeem(uint256 amountToken, address toAccount)
        external
        nonReentrant
        nonZeroInput(amountToken)
        returns (bool)
    {
        address account = msg.sender;
        frBASE -= amountToken;
        _burn(account, amountToken);
        emit TOKEN__Redeem(account, toAccount, amountToken);
        BASE.safeTransfer(toAccount, amountToken);
        return true;
    }

    /**
     * @notice Borrow BASE from the bonding curve against VTOKEN collateral at the floor price of TOKEN.
     *         VTOKEN collateral is locked until the debt is repaid. No bad debt is possible because TOKEN can
     *         never go below the floor price. Therefore, no oracle or liquidation mechanism is required.
     * @param amountBase Amount of BASE to borrow, must be less than the account's borrow credit limit 
     *                   (VTOKEN balance * floor price of TOKEN)
     * @return bool true=success, otherwise false
     */
    function borrow(uint256 amountBase)
        external
        nonReentrant
        nonZeroInput(amountBase)
        returns (bool)
    {
        address account = msg.sender;
        uint256 credit = getAccountCredit(account);
        if (credit < amountBase) revert TOKEN__ExceedsBorrowCreditLimit();
        debts[account] += amountBase;
        debtTotal += amountBase;
        uint256 feeBASE = amountBase * PROTOCOL_FEE / DIVISOR;
        emit TOKEN__Borrow(account, amountBase);
        BASE.safeTransfer(FEES, feeBASE);
        BASE.safeTransfer(account, amountBase - feeBASE);
        return true;
    }

    /**
     * @notice Repay BASE to the bonding curve to reduce the account's borrow credit limit and unlock VTOKEN collateral
     * @param amountBase Amount of BASE to repay, must be less than or equal to the account's debt
     * @return bool true=success, otherwise false
     */
    function repay(uint256 amountBase) 
        external
        nonReentrant
        nonZeroInput(amountBase)
        returns (bool)
    {
        address account = msg.sender;
        debts[account] -= amountBase;
        debtTotal -= amountBase;
        emit TOKEN__Repay(account, amountBase);
        BASE.safeTransferFrom(account, address(this), amountBase);
        return true;
    }

    /*----------  VIEW FUNCTIONS  ---------------------------------------*/

    function getFloorPrice() public pure returns (uint256) {
        return FLOOR_PRICE;
    }

    function getMarketPrice() public view returns (uint256) {
        return ((mrvBASE + mrrBASE) * PRECISION) / mrrTOKEN;
    }

    function getOTokenPrice() public view returns (uint256) {
        return getMarketPrice() - getFloorPrice();
    }

    function getMaxSell() public view returns (uint256) {
        return (mrrTOKEN * mrrBASE / mrvBASE);
    }

    function getTotalValueLocked() public view returns (uint256) {
        return frBASE + mrrBASE;
    }

    function getAccountCredit(address account) public view returns (uint256) {
        return IVTOKEN(VTOKEN).balanceOfTOKEN(account) - debts[account];
    }

}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @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 ReentrancyGuard {
    // 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;

    constructor() {
        _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() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

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

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

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.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * 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}.
     *
     * 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 default value returned by this function, unless
     * it's 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:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, 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}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, 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) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, 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) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * 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:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, 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;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _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;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _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 Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - 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: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

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
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.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 SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 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(IERC20 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));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @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(IERC20 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");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @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).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // 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 cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/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/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

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

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

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

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

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

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

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

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

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

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

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

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

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: MIT
pragma solidity 0.8.19;

interface IOTOKEN {
    /*----------  FUNCTIONS  --------------------------------------------*/
    function burnFrom(address account, uint256 amount) external;
    /*----------  RESTRICTED FUNCTIONS  ---------------------------------*/
    function mint(address account, uint amount) external returns (bool);
    /*----------  VIEW FUNCTIONS  ---------------------------------------*/
    function minter() external view returns (address);
}

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

interface IOTOKENFactory {
    /*----------  FUNCTIONS  --------------------------------------------*/
    function createOToken(address _owner) external returns (address);
    /*----------  RESTRICTED FUNCTIONS  ---------------------------------*/
    /*----------  VIEW FUNCTIONS  ---------------------------------------*/
}

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

interface ITOKENFeesFactory {
    /*----------  FUNCTIONS  --------------------------------------------*/
    function createTokenFees(address _rewarder, address _TOKEN, address _BASE, address _OTOKEN) external returns (address);
    /*----------  RESTRICTED FUNCTIONS  ---------------------------------*/
    /*----------  VIEW FUNCTIONS  ---------------------------------------*/
}

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

interface IVTOKEN {
    /*----------  FUNCTIONS  --------------------------------------------*/
    /*----------  RESTRICTED FUNCTIONS  ---------------------------------*/
    /*----------  VIEW FUNCTIONS  ---------------------------------------*/
    function OTOKEN() external view returns (address);
    function balanceOf(address account) external view returns (uint256);
    function balanceOfTOKEN(address account) external view returns (uint256);
    function totalSupply() external view returns (uint256);
    function totalSupplyTOKEN() external view returns (uint256);
}

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

interface IVTOKENFactory {
    /*----------  FUNCTIONS  --------------------------------------------*/
    function createVToken(address _TOKEN, address _OTOKEN, address _VTOKENRewarderFactory, address _owner) external returns (address, address);
    /*----------  RESTRICTED FUNCTIONS  ---------------------------------*/
    /*----------  VIEW FUNCTIONS  ---------------------------------------*/
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200,
    "details": {}
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DECIMALS","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DIVISOR","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"FEES","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"FLOOR_PRICE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"OTOKEN","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PRECISION","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PROTOCOL_FEE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PROVIDER_FEE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"VTOKEN","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountBase","type":"uint256"}],"name":"borrow","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountBase","type":"uint256"},{"internalType":"uint256","name":"minToken","type":"uint256"},{"internalType":"uint256","name":"expireTimestamp","type":"uint256"},{"internalType":"address","name":"toAccount","type":"address"},{"internalType":"address","name":"provider","type":"address"}],"name":"buy","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"debtTotal","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"debts","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOToken","type":"uint256"},{"internalType":"address","name":"toAccount","type":"address"}],"name":"exercise","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"frBASE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"getAccountCredit","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getFloorPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"getMarketPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getMaxSell","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getOTokenPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getTotalValueLocked","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"mrrBASE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mrrTOKEN","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mrvBASE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountToken","type":"uint256"},{"internalType":"address","name":"toAccount","type":"address"}],"name":"redeem","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountBase","type":"uint256"}],"name":"repay","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountToken","type":"uint256"},{"internalType":"uint256","name":"minBase","type":"uint256"},{"internalType":"uint256","name":"expireTimestamp","type":"uint256"},{"internalType":"address","name":"toAccount","type":"address"},{"internalType":"address","name":"provider","type":"address"}],"name":"sell","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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