Contract 0x902Aa4cC3b463c84541C9C1DeDF50620C99950B9

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

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

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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 v4.8.0) (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 (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts 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 v4.4.1 (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 v4.8.0) (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. Compatible with tokens that require the approval to be set to
     * 0 before setting it to a non-zero value.
     */
    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 v4.8.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

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

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

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

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```solidity
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 * Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
 * unusable.
 * See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 * In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an
 * array of EnumerableSet.
 * ====
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

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

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

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

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

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

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

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

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

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

            return true;
        } else {
            return false;
        }
    }

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

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

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

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

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

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

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

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

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

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

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

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

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

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

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

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

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

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

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

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

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

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

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

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

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

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

interface IXSteakTokenUsage {
    function allocate(
        address userAddress,
        uint256 amount,
        bytes calldata data
    ) external;

    function deallocate(
        address userAddress,
        uint256 amount,
        bytes calldata data
    ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

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

interface IXSteakToken is IERC20 {
    function usageAllocations(
        address userAddress,
        address usageAddress
    ) external view returns (uint256 allocation);

    function allocateFromUsage(address userAddress, uint256 amount) external;

    function convertTo(uint256 amount, address to) external;

    function deallocateFromUsage(address userAddress, uint256 amount) external;

    function isTransferWhitelisted(
        address account
    ) external view returns (bool);
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

import "openzeppelin/access/Ownable.sol";
import "openzeppelin/token/ERC20/utils/SafeERC20.sol";
import "openzeppelin/security/ReentrancyGuard.sol";
import "openzeppelin/utils/math/SafeMath.sol";
import "openzeppelin/utils/structs/EnumerableSet.sol";
import "openzeppelin/token/ERC721/IERC721.sol";

/*
 * Simple allowlist which checks if NFT collection is held by a user.
 * by @SteakHut Finance
 */
contract AllowList is Ownable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;
    using EnumerableSet for EnumerableSet.AddressSet;

    // NFT collection addresses to whitelist from paying deallocation fee
    EnumerableSet.AddressSet private whitelistedCollections;

    constructor() {}

    /********************************************/
    /****************** EVENTS ******************/
    /********************************************/

    event WhitelistCollection(address collection);
    event RemoveCollection(address collection);

    /********************************************/
    /****************** VIEW ******************/
    /********************************************/

    /// @notice Returns the type id at index `_index` where whitelist has a non-zero balance
    /// @param _index The position index
    /// @return The non-zero position at index `_index`
    function whitelistCollectionPositionAtIndex(
        uint256 _index
    ) external view returns (address) {
        return whitelistedCollections.at(_index);
    }

    /// @notice Returns the number of whitelisted NFT collections
    /// @return The number of whitelisted NFT collections
    function whitelistCollectionPositionNumber()
        external
        view
        returns (uint256)
    {
        return whitelistedCollections.length();
    }

    /// @notice Returns if the user holds NFT collection
    /// @return isAllowListed true if user hold collection
    function isAllowlisted(
        address user
    ) external view returns (bool isAllowListed) {
        for (uint i = 0; i < whitelistedCollections.length(); i++) {
            if (
                address(whitelistedCollections.at(i)) != address(0) &&
                IERC721(whitelistedCollections.at(i)).balanceOf(user) > 0 &&
                user == tx.origin
            ) {
                isAllowListed = true;
            }
        }
    }

    /********************************************/
    /****************** OWNER ******************/
    /********************************************/

    /**
     * @dev Adds a NFT collection to the whitelist
     */
    function addWhitelistedCollection(address collection) external onlyOwner {
        require(
            collection != address(0),
            "addWhitelistedCollection: Cannot whitelist 0 address"
        );

        whitelistedCollections.add(collection);
        emit WhitelistCollection(collection);
    }

    /**
     * @dev removes a NFT collection from the whitelist
     */
    function removeWhitelistedCollection(
        address collection
    ) external onlyOwner {
        require(
            collection != address(0),
            "removeWhitelistedCollection: Cannot remove whitelist of 0 address"
        );

        whitelistedCollections.remove(collection);
        emit RemoveCollection(collection);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.17;

import "openzeppelin/access/Ownable.sol";
import "openzeppelin/utils/math/SafeMath.sol";
import "openzeppelin/token/ERC20/utils/SafeERC20.sol";
import "openzeppelin/token/ERC20/ERC20.sol";
import "openzeppelin/token/ERC20/IERC20.sol";
import "openzeppelin/security/ReentrancyGuard.sol";
import "openzeppelin/utils/structs/EnumerableSet.sol";

import "./interfaces/tokens/IXSteakToken.sol";
import "./interfaces/IXSteakTokenUsage.sol";

import "./plugins/allowList.sol";

/*
 * xSTEAK is SteakHuts escrowed governance token obtainable by converting STEAK to it
 * It's non-transferable, except from/to whitelisted addresses
 * It can be converted back to STEAK through a vesting process
 * This contract is made to receive xSTEAK deposits from users in order to allocate them to Usages (plugins) contracts
 * All Credit to the Camelot Dex team!
 * STEAK will be stuck in this contract in place of burning.
 * If holder has a STEAK.JPEG allows for a reduced redemption fee %. (can also whitelist future collections)
 */

contract XSteak is
    Ownable,
    ReentrancyGuard,
    ERC20("STEAK escrowed token", "xSTEAK"),
    IXSteakToken
{
    using Address for address;
    using SafeMath for uint256;
    using EnumerableSet for EnumerableSet.AddressSet;
    using SafeERC20 for IERC20;

    struct XSteakBalance {
        uint256 allocatedAmount; // Amount of xSTEAK allocated to a Usage
        uint256 redeemingAmount; // Total amount of xSTEAK currently being redeemed
    }

    struct RedeemInfo {
        uint256 steakAmount; // STEAK amount to receive when vesting has ended
        uint256 xSteakAmount; // xSTEAK amount to redeem
        uint256 endTime;
        IXSteakTokenUsage dividendsAddress;
        uint256 dividendsAllocation; // Share of redeeming xSTEAK to allocate to the Dividends Usage contract
    }

    IERC20 public immutable steakToken; // STEAK token to convert to/from
    IXSteakTokenUsage public dividendsAddress; // SteakHut dividends contract
    EnumerableSet.AddressSet private _transferWhitelist; // addresses allowed to send/receive xSTEAK
    address public allowListAddress; // SteakHut allowlist contract address

    mapping(address => mapping(address => uint256)) public usageApprovals; // Usage approvals to allocate xSTEAK
    mapping(address => mapping(address => uint256))
        public
        override usageAllocations; // Active xSTEAK allocations to usages

    uint256 public constant MAX_DEALLOCATION_FEE = 200; // 2%
    mapping(address => uint256) public usagesDeallocationFee; // Fee paid when deallocating xSTEAK

    uint256 public constant MAX_FIXED_RATIO = 100; // 100%

    // Redeeming min/max settings
    uint256 public minRedeemRatio = 50; // 1:0.5
    uint256 public maxRedeemRatio = 100; // 1:1
    uint256 public minRedeemDuration = 15 days; // 1296000s
    uint256 public maxRedeemDuration = 90 days; // 7776000s
    // Adjusted dividends rewards for redeeming xSTEAK
    uint256 public redeemDividendsAdjustment = 50; // 50%

    mapping(address => XSteakBalance) public XSteakBalances; // User's xSTEAK balances
    mapping(address => RedeemInfo[]) public userRedeems; // User's redeeming instances

    constructor(IERC20 steakToken_) {
        steakToken = steakToken_;
        _transferWhitelist.add(address(this));
    }

    /********************************************/
    /****************** EVENTS ******************/
    /********************************************/

    event ApproveUsage(
        address indexed userAddress,
        address indexed usageAddress,
        uint256 amount
    );
    event Convert(address indexed from, address to, uint256 amount);
    event UpdateRedeemSettings(
        uint256 minRedeemRatio,
        uint256 maxRedeemRatio,
        uint256 minRedeemDuration,
        uint256 maxRedeemDuration,
        uint256 redeemDividendsAdjustment
    );
    event UpdateDividendsAddress(
        address previousDividendsAddress,
        address newDividendsAddress
    );
    event UpdateDeallocationFee(address indexed usageAddress, uint256 fee);
    event SetTransferWhitelist(address account, bool add);
    event Redeem(
        address indexed userAddress,
        uint256 xSteakAmount,
        uint256 steakAmount,
        uint256 duration
    );
    event FinalizeRedeem(
        address indexed userAddress,
        uint256 xSteakAmount,
        uint256 steakAmount
    );
    event CancelRedeem(address indexed userAddress, uint256 xSteakAmount);
    event UpdateRedeemDividendsAddress(
        address indexed userAddress,
        uint256 redeemIndex,
        address previousDividendsAddress,
        address newDividendsAddress
    );
    event Allocate(
        address indexed userAddress,
        address indexed usageAddress,
        uint256 amount
    );
    event Deallocate(
        address indexed userAddress,
        address indexed usageAddress,
        uint256 amount,
        uint256 fee
    );

    event SetAllowList(address allowList);
    event TransferExcess(uint256 amount, address recipient);

    /***********************************************/
    /****************** MODIFIERS ******************/
    /***********************************************/

    /*
     * @dev Check if a redeem entry exists
     */
    modifier validateRedeem(address userAddress, uint256 redeemIndex) {
        require(
            redeemIndex < userRedeems[userAddress].length,
            "validateRedeem: redeem entry does not exist"
        );
        _;
    }

    /**************************************************/
    /****************** PUBLIC VIEWS ******************/
    /**************************************************/

    /*
     * @dev Returns user's xSTEAK balances
     */
    function getXSteakBalance(
        address userAddress
    ) external view returns (uint256 allocatedAmount, uint256 redeemingAmount) {
        XSteakBalance storage balance = XSteakBalances[userAddress];
        return (balance.allocatedAmount, balance.redeemingAmount);
    }

    /*
     * @dev returns redeemable STEAK for "amount" of xSTEAK vested for "duration" seconds
     */
    function getSteakByVestingDuration(
        uint256 amount,
        uint256 duration
    ) public view returns (uint256) {
        if (duration < minRedeemDuration) {
            return 0;
        }

        // capped to maxRedeemDuration
        if (duration > maxRedeemDuration) {
            return amount.mul(maxRedeemRatio).div(100);
        }

        //otherwise the ratio is a factor of time
        uint256 ratio = minRedeemRatio.add(
            (duration.sub(minRedeemDuration))
                .mul(maxRedeemRatio.sub(minRedeemRatio))
                .div(maxRedeemDuration.sub(minRedeemDuration))
        );

        return amount.mul(ratio).div(100);
    }

    /**
     * @dev returns quantity of "userAddress" pending redeems
     */
    function getUserRedeemsLength(
        address userAddress
    ) external view returns (uint256) {
        return userRedeems[userAddress].length;
    }

    /**
     * @dev returns "userAddress" info for a pending redeem identified by "redeemIndex"
     */
    function getUserRedeem(
        address userAddress,
        uint256 redeemIndex
    )
        external
        view
        validateRedeem(userAddress, redeemIndex)
        returns (
            uint256 steakAmount,
            uint256 xSteakAmount,
            uint256 endTime,
            address dividendsContract,
            uint256 dividendsAllocation
        )
    {
        RedeemInfo storage _redeem = userRedeems[userAddress][redeemIndex];
        return (
            _redeem.steakAmount,
            _redeem.xSteakAmount,
            _redeem.endTime,
            address(_redeem.dividendsAddress),
            _redeem.dividendsAllocation
        );
    }

    /**
     * @dev returns approved xSTEAK to allocate from "userAddress" to "usageAddress"
     */
    function getUsageApproval(
        address userAddress,
        address usageAddress
    ) external view returns (uint256) {
        return usageApprovals[userAddress][usageAddress];
    }

    /**
     * @dev returns allocated xSTEAK from "userAddress" to "usageAddress"
     */
    function getUsageAllocation(
        address userAddress,
        address usageAddress
    ) external view returns (uint256) {
        return usageAllocations[userAddress][usageAddress];
    }

    /**
     * @dev returns length of transferWhitelist array
     */
    function transferWhitelistLength() external view returns (uint256) {
        return _transferWhitelist.length();
    }

    /**
     * @dev returns transferWhitelist array item's address for "index"
     */
    function transferWhitelist(uint256 index) external view returns (address) {
        return _transferWhitelist.at(index);
    }

    /**
     * @dev returns if "account" is allowed to send/receive xSTEAK
     */
    function isTransferWhitelisted(
        address account
    ) external view override returns (bool) {
        return _transferWhitelist.contains(account);
    }

    /*******************************************************/
    /****************** OWNABLE FUNCTIONS ******************/
    /*******************************************************/

    /**
     * @dev Updates all redeem ratios and durations
     *
     * Must only be called by owner
     */
    function updateRedeemSettings(
        uint256 minRedeemRatio_,
        uint256 maxRedeemRatio_,
        uint256 minRedeemDuration_,
        uint256 maxRedeemDuration_,
        uint256 redeemDividendsAdjustment_
    ) external onlyOwner {
        require(
            minRedeemRatio_ <= maxRedeemRatio_,
            "updateRedeemSettings: wrong ratio values"
        );
        require(
            minRedeemDuration_ < maxRedeemDuration_,
            "updateRedeemSettings: wrong duration values"
        );
        // should never exceed 100%
        require(
            maxRedeemRatio_ <= MAX_FIXED_RATIO &&
                redeemDividendsAdjustment_ <= MAX_FIXED_RATIO,
            "updateRedeemSettings: wrong ratio values"
        );

        minRedeemRatio = minRedeemRatio_;
        maxRedeemRatio = maxRedeemRatio_;
        minRedeemDuration = minRedeemDuration_;
        maxRedeemDuration = maxRedeemDuration_;
        redeemDividendsAdjustment = redeemDividendsAdjustment_;

        emit UpdateRedeemSettings(
            minRedeemRatio_,
            maxRedeemRatio_,
            minRedeemDuration_,
            maxRedeemDuration_,
            redeemDividendsAdjustment_
        );
    }

    /**
     * @dev Updates dividends contract address
     *
     * Must only be called by owner
     */
    function updateDividendsAddress(
        IXSteakTokenUsage dividendsAddress_
    ) external onlyOwner {
        // if set to 0, also set divs earnings while redeeming to 0
        if (address(dividendsAddress_) == address(0)) {
            redeemDividendsAdjustment = 0;
        }

        emit UpdateDividendsAddress(
            address(dividendsAddress),
            address(dividendsAddress_)
        );
        dividendsAddress = dividendsAddress_;
    }

    /**
     * @dev Updates fee paid by users when deallocating from "usageAddress"
     */
    function updateDeallocationFee(
        address usageAddress,
        uint256 fee
    ) external onlyOwner {
        require(fee <= MAX_DEALLOCATION_FEE, "updateDeallocationFee: too high");

        usagesDeallocationFee[usageAddress] = fee;
        emit UpdateDeallocationFee(usageAddress, fee);
    }

    /**
     * @dev Adds or removes addresses from the transferWhitelist
     */
    function updateTransferWhitelist(
        address account,
        bool add
    ) external onlyOwner {
        require(
            account != address(this),
            "updateTransferWhitelist: Cannot remove xSteak from whitelist"
        );

        if (add) _transferWhitelist.add(account);
        else _transferWhitelist.remove(account);

        emit SetTransferWhitelist(account, add);
    }

    /**
     * @dev updates the address of the allowList contract
     */
    function updateAllowListAddress(
        address _allowListAddress
    ) external onlyOwner {
        require(
            _allowListAddress != address(0),
            "updateAllowListAddress: no 0 address"
        );

        allowListAddress = _allowListAddress;

        emit SetAllowList(allowListAddress);
    }

    /// @notice Rescues funds from contract
    /// @param _token address of the token to rescue.
    function inCaseTokensGetStuck(address _token) external onlyOwner {
        uint256 amount = IERC20(_token).balanceOf(address(this));
        IERC20(_token).safeTransfer(msg.sender, amount);
    }

    /// @notice Removes excess steak from the contract
    /// @param _recipient address to send excess steak to
    function removeExcessSteak(address _recipient) external onlyOwner {
        uint256 steakAmount = steakToken.balanceOf(address(this));
        uint256 xSteakAmount = totalSupply();
        require(steakAmount > xSteakAmount, "xSTEAK: no excess STEAK");

        uint256 excessSteak = steakAmount - xSteakAmount;

        steakToken.safeTransfer(_recipient, excessSteak);
        emit TransferExcess(excessSteak, _recipient);
    }

    /*****************************************************************/
    /******************  EXTERNAL PUBLIC FUNCTIONS  ******************/
    /*****************************************************************/

    /**
     * @dev Approves "usage" address to get allocations up to "amount" of xSTEAK from msg.sender
     */
    function approveUsage(
        IXSteakTokenUsage usage,
        uint256 amount
    ) external nonReentrant {
        require(
            address(usage) != address(0),
            "approveUsage: approve to the zero address"
        );

        usageApprovals[msg.sender][address(usage)] = amount;
        emit ApproveUsage(msg.sender, address(usage), amount);
    }

    /**
     * @dev Convert caller's "amount" of STEAK to xSTEAK
     */
    function convert(uint256 amount) external nonReentrant {
        _convert(amount, msg.sender);
    }

    /**
     * @dev Convert caller's "amount" of STEAK to xSTEAK to "to" address
     */
    function convertTo(
        uint256 amount,
        address to
    ) external override nonReentrant {
        require(address(msg.sender).isContract(), "convertTo: not allowed");
        _convert(amount, to);
    }

    /**
     * @dev Initiates redeem process (xSTEAK to STEAK)
     *
     * Handles dividends' compensation allocation during the vesting process if needed
     */
    function redeem(
        uint256 xSteakAmount,
        uint256 duration
    ) external nonReentrant {
        require(xSteakAmount > 0, "redeem: xSteakAmount cannot be null");
        require(duration >= minRedeemDuration, "redeem: duration too low");

        _transfer(msg.sender, address(this), xSteakAmount);
        XSteakBalance storage balance = XSteakBalances[msg.sender];

        // get corresponding STEAK amount
        uint256 steakAmount = getSteakByVestingDuration(xSteakAmount, duration);
        emit Redeem(msg.sender, xSteakAmount, steakAmount, duration);

        // if redeeming is not immediate, go through vesting process
        if (duration > 0) {
            // add to SBT total
            balance.redeemingAmount = balance.redeemingAmount.add(xSteakAmount);

            // handle dividends during the vesting process
            uint256 dividendsAllocation = xSteakAmount
                .mul(redeemDividendsAdjustment)
                .div(100);
            // only if compensation is active
            if (dividendsAllocation > 0) {
                // allocate to dividends

                dividendsAddress.allocate(
                    msg.sender,
                    dividendsAllocation,
                    new bytes(0)
                );
            }

            // add redeeming entry
            userRedeems[msg.sender].push(
                RedeemInfo(
                    steakAmount,
                    xSteakAmount,
                    _currentBlockTimestamp().add(duration),
                    dividendsAddress,
                    dividendsAllocation
                )
            );
        } else {
            // immediately redeem for STEAK
            _finalizeRedeem(msg.sender, xSteakAmount, steakAmount);
        }
    }

    /**
     * @dev Finalizes redeem process when vesting duration has been reached
     *
     * Can only be called by the redeem entry owner
     */
    function finalizeRedeem(
        uint256 redeemIndex
    ) external nonReentrant validateRedeem(msg.sender, redeemIndex) {
        XSteakBalance storage balance = XSteakBalances[msg.sender];
        RedeemInfo storage _redeem = userRedeems[msg.sender][redeemIndex];
        require(
            _currentBlockTimestamp() >= _redeem.endTime,
            "finalizeRedeem: vesting duration has not ended yet"
        );

        // remove from SBT total
        balance.redeemingAmount = balance.redeemingAmount.sub(
            _redeem.xSteakAmount
        );
        _finalizeRedeem(msg.sender, _redeem.xSteakAmount, _redeem.steakAmount);

        // handle dividends compensation if any was active
        if (_redeem.dividendsAllocation > 0) {
            // deallocate from dividends
            IXSteakTokenUsage(_redeem.dividendsAddress).deallocate(
                msg.sender,
                _redeem.dividendsAllocation,
                new bytes(0)
            );
        }

        // remove redeem entry
        _deleteRedeemEntry(redeemIndex);
    }

    /**
     * @dev Updates dividends address for an existing active redeeming process
     *
     * Can only be called by the involved user
     * Should only be used if dividends contract was to be migrated
     */
    function updateRedeemDividendsAddress(
        uint256 redeemIndex
    ) external nonReentrant validateRedeem(msg.sender, redeemIndex) {
        RedeemInfo storage _redeem = userRedeems[msg.sender][redeemIndex];

        // only if the active dividends contract is not the same anymore
        if (
            dividendsAddress != _redeem.dividendsAddress &&
            address(dividendsAddress) != address(0)
        ) {
            if (_redeem.dividendsAllocation > 0) {
                // deallocate from old dividends contract
                _redeem.dividendsAddress.deallocate(
                    msg.sender,
                    _redeem.dividendsAllocation,
                    new bytes(0)
                );
                // allocate to new used dividends contract
                dividendsAddress.allocate(
                    msg.sender,
                    _redeem.dividendsAllocation,
                    new bytes(0)
                );
            }

            emit UpdateRedeemDividendsAddress(
                msg.sender,
                redeemIndex,
                address(_redeem.dividendsAddress),
                address(dividendsAddress)
            );
            _redeem.dividendsAddress = dividendsAddress;
        }
    }

    /**
     * @dev Cancels an ongoing redeem entry
     *
     * Can only be called by its owner
     */
    function cancelRedeem(
        uint256 redeemIndex
    ) external nonReentrant validateRedeem(msg.sender, redeemIndex) {
        XSteakBalance storage balance = XSteakBalances[msg.sender];
        RedeemInfo storage _redeem = userRedeems[msg.sender][redeemIndex];

        // make redeeming xSTEAK available again
        balance.redeemingAmount = balance.redeemingAmount.sub(
            _redeem.xSteakAmount
        );
        _transfer(address(this), msg.sender, _redeem.xSteakAmount);

        // handle dividends compensation if any was active
        if (_redeem.dividendsAllocation > 0) {
            // deallocate from dividends
            IXSteakTokenUsage(_redeem.dividendsAddress).deallocate(
                msg.sender,
                _redeem.dividendsAllocation,
                new bytes(0)
            );
        }

        emit CancelRedeem(msg.sender, _redeem.xSteakAmount);

        // remove redeem entry
        _deleteRedeemEntry(redeemIndex);
    }

    /**
     * @dev Allocates caller's "amount" of available xSTEAK to "usageAddress" contract
     *
     * args specific to usage contract must be passed into "usageData"
     */
    function allocate(
        address usageAddress,
        uint256 amount,
        bytes calldata usageData
    ) external nonReentrant {
        _allocate(msg.sender, usageAddress, amount);

        // allocates xSTEAK to usageContract
        IXSteakTokenUsage(usageAddress).allocate(msg.sender, amount, usageData);
    }

    /**
     * @dev Allocates "amount" of available xSTEAK from "userAddress" to caller (ie usage contract)
     *
     * Caller must have an allocation approval for the required xSteak xSTEAK from "userAddress"
     */
    function allocateFromUsage(
        address userAddress,
        uint256 amount
    ) external override nonReentrant {
        _allocate(userAddress, msg.sender, amount);
    }

    /**
     * @dev Deallocates caller's "amount" of available xSTEAK from "usageAddress" contract
     *
     * args specific to usage contract must be passed into "usageData"
     */
    function deallocate(
        address usageAddress,
        uint256 amount,
        bytes calldata usageData
    ) external nonReentrant {
        _deallocate(msg.sender, usageAddress, amount);

        // deallocate xSTEAK into usageContract
        IXSteakTokenUsage(usageAddress).deallocate(
            msg.sender,
            amount,
            usageData
        );
    }

    /**
     * @dev Deallocates "amount" of allocated xSTEAK belonging to "userAddress" from caller (ie usage contract)
     *
     * Caller can only deallocate xSTEAK from itself
     */
    function deallocateFromUsage(
        address userAddress,
        uint256 amount
    ) external override nonReentrant {
        _deallocate(userAddress, msg.sender, amount);
    }

    /********************************************************/
    /****************** INTERNAL FUNCTIONS ******************/
    /********************************************************/

    /**
     * @dev Convert caller's "amount" of STEAK into xSTEAK to "to"
     */
    function _convert(uint256 amount, address to) internal {
        require(amount != 0, "convert: amount cannot be null");

        steakToken.safeTransferFrom(msg.sender, address(this), amount);
        // mint new xSTEAK
        _mint(to, amount);

        emit Convert(msg.sender, to, amount);
    }

    /**
     * @dev Finalizes the redeeming process for "userAddress" by transferring him "steakAmount" and removing "xSteakAmount" from supply
     *
     * Any vesting check should be ran before calling this
     * STEAK excess is retained in this contract
     */
    function _finalizeRedeem(
        address userAddress,
        uint256 xSteakAmount,
        uint256 steakAmount
    ) internal {
        // sends due STEAK tokens
        steakToken.safeTransfer(userAddress, steakAmount);

        // burns STEAK excess if any (stuck in this contract)
        _burn(address(this), xSteakAmount);

        emit FinalizeRedeem(userAddress, xSteakAmount, steakAmount);
    }

    /**
     * @dev Allocates "userAddress" user's "amount" of available xSTEAK to "usageAddress" contract
     *
     */
    function _allocate(
        address userAddress,
        address usageAddress,
        uint256 amount
    ) internal {
        require(amount > 0, "allocate: amount cannot be null");

        XSteakBalance storage balance = XSteakBalances[userAddress];

        // approval checks if allocation request amount has been approved by userAddress to be allocated to this usageAddress
        uint256 approvedXSteak = usageApprovals[userAddress][usageAddress];
        require(approvedXSteak >= amount, "allocate: non authorized amount");

        // remove allocated amount from usage's approved amount
        usageApprovals[userAddress][usageAddress] = approvedXSteak.sub(amount);

        // update usage's allocatedAmount for userAddress
        usageAllocations[userAddress][usageAddress] = usageAllocations[
            userAddress
        ][usageAddress].add(amount);

        // adjust user's xSTEAK balances
        balance.allocatedAmount = balance.allocatedAmount.add(amount);
        _transfer(userAddress, address(this), amount);

        emit Allocate(userAddress, usageAddress, amount);
    }

    /**
     * @dev Deallocates "amount" of available xSTEAK to "usageAddress" contract
     *
     * args specific to usage contract must be passed into "usageData"
     */
    function _deallocate(
        address userAddress,
        address usageAddress,
        uint256 amount
    ) internal {
        require(amount > 0, "deallocate: amount cannot be null");

        // check if there is enough allocated xSTEAK to this usage to deallocate
        uint256 allocatedAmount = usageAllocations[userAddress][usageAddress];
        require(allocatedAmount >= amount, "deallocate: non authorized amount");

        // remove deallocated amount from usage's allocation
        usageAllocations[userAddress][usageAddress] = allocatedAmount.sub(
            amount
        );

        uint256 deallocationFeeAmount = amount
            .mul(usagesDeallocationFee[usageAddress])
            .div(10000);

        //remove the deallocation fee if user holds an allowlist
        if (AllowList(allowListAddress).isAllowlisted(msg.sender)) {
            deallocationFeeAmount = 0;
        }

        // adjust user's xSTEAK balances
        XSteakBalance storage balance = XSteakBalances[userAddress];
        balance.allocatedAmount = balance.allocatedAmount.sub(amount);
        _transfer(
            address(this),
            userAddress,
            amount.sub(deallocationFeeAmount)
        );

        // burn corresponding xSTEAK
        _burn(address(this), deallocationFeeAmount);

        emit Deallocate(
            userAddress,
            usageAddress,
            amount,
            deallocationFeeAmount
        );
    }

    function _deleteRedeemEntry(uint256 index) internal {
        userRedeems[msg.sender][index] = userRedeems[msg.sender][
            userRedeems[msg.sender].length - 1
        ];
        userRedeems[msg.sender].pop();
    }

    /**
     * @dev Hook override to forbid transfers except from whitelisted addresses and minting
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 /*amount*/
    ) internal view override {
        require(
            from == address(0) ||
                _transferWhitelist.contains(from) ||
                _transferWhitelist.contains(to),
            "transfer: not allowed"
        );
    }

    /**
     * @dev Utility function to get the current block timestamp
     */
    function _currentBlockTimestamp() internal view virtual returns (uint256) {
        /* solhint-disable not-rely-on-time */
        return block.timestamp;
    }
}

{
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/contracts/",
    "openzeppelin/=lib/openzeppelin-contracts/contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

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IERC20","name":"steakToken_","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"userAddress","type":"address"},{"indexed":true,"internalType":"address","name":"usageAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Allocate","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"userAddress","type":"address"},{"indexed":true,"internalType":"address","name":"usageAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"ApproveUsage","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"userAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"xSteakAmount","type":"uint256"}],"name":"CancelRedeem","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Convert","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"userAddress","type":"address"},{"indexed":true,"internalType":"address","name":"usageAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"fee","type":"uint256"}],"name":"Deallocate","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"userAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"xSteakAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"steakAmount","type":"uint256"}],"name":"FinalizeRedeem","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"userAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"xSteakAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"steakAmount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"duration","type":"uint256"}],"name":"Redeem","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"allowList","type":"address"}],"name":"SetAllowList","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"bool","name":"add","type":"bool"}],"name":"SetTransferWhitelist","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"recipient","type":"address"}],"name":"TransferExcess","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"usageAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"fee","type":"uint256"}],"name":"UpdateDeallocationFee","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"previousDividendsAddress","type":"address"},{"indexed":false,"internalType":"address","name":"newDividendsAddress","type":"address"}],"name":"UpdateDividendsAddress","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"userAddress","type":"address"},{"indexed":false,"internalType":"uint256","name":"redeemIndex","type":"uint256"},{"indexed":false,"internalType":"address","name":"previousDividendsAddress","type":"address"},{"indexed":false,"internalType":"address","name":"newDividendsAddress","type":"address"}],"name":"UpdateRedeemDividendsAddress","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"minRedeemRatio","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"maxRedeemRatio","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"minRedeemDuration","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"maxRedeemDuration","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"redeemDividendsAdjustment","type":"uint256"}],"name":"UpdateRedeemSettings","type":"event"},{"inputs":[],"name":"MAX_DEALLOCATION_FEE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_FIXED_RATIO","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"XSteakBalances","outputs":[{"internalType":"uint256","name":"allocatedAmount","type":"uint256"},{"internalType":"uint256","name":"redeemingAmount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"usageAddress","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"usageData","type":"bytes"}],"name":"allocate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"userAddress","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"allocateFromUsage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"allowListAddress","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":"contract 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IERC20","name":"","type":"address"}],"stateMutability":"view","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"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"transferWhitelist","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"transferWhitelistLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_allowListAddress","type":"address"}],"name":"updateAllowListAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"usageAddress","type":"address"},{"internalType":"uint256","name":"fee","type":"uint256"}],"name":"updateDeallocationFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract 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IXSteakTokenUsage","name":"dividendsAddress","type":"address"},{"internalType":"uint256","name":"dividendsAllocation","type":"uint256"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000b279f8dd152b99ec1d84a489d32c35bc0c7f5674

-----Decoded View---------------
Arg [0] : steakToken_ (address): 0xb279f8dd152b99ec1d84a489d32c35bc0c7f5674

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000b279f8dd152b99ec1d84a489d32c35bc0c7f5674