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// SPDX-License-Identifier: MIT
pragma solidity 0.8.16;

/**
 * ██████╗ ██╗   ██╗████████╗████████╗██╗   ██╗    ██╗   ██╗██████╗
 * ██╔══██╗██║   ██║╚══██╔══╝╚══██╔══╝╚██╗ ██╔╝    ██║   ██║╚════██╗
 * ██████╔╝██║   ██║   ██║      ██║    ╚████╔╝     ██║   ██║ █████╔╝
 * ██╔═══╝ ██║   ██║   ██║      ██║     ╚██╔╝      ╚██╗ ██╔╝██╔═══╝
 * ██║     ╚██████╔╝   ██║      ██║      ██║        ╚████╔╝ ███████╗
 * ╚═╝      ╚═════╝    ╚═╝      ╚═╝      ╚═╝         ╚═══╝  ╚══════╝
 *
 *
 * _..._
 * .'     '.      _
 * /    .-""-\   _/ \
 * .-|   /:.   |  |   |   bussin
 * |  \  |:.   /.-'-./
 * | .-'-;:__.'    =/
 * .'=  *=|     _.='
 * /   _.  |    ;        minister you satoshi
 * ;-.-'|    \   |
 * /   | \    _\  _\
 * \__/'._;.  ==' ==\
 * \    \   |
 * /    /   /
 * /-._/-._/
 * jgs    \   `\  \
 * `-._/._/
 *
 *
 * this is a public good.
 * by out.eth and tamagoyaki
 */

import "./lib/IWETH.sol";

import "openzeppelin/utils/cryptography/SignatureChecker.sol";
import "openzeppelin/utils/cryptography/draft-EIP712.sol";
import "openzeppelin/utils/Strings.sol";
import "openzeppelin/utils/introspection/ERC165Checker.sol";
import "openzeppelin/access/Ownable.sol";
import "solmate/utils/SafeTransferLib.sol";
import "solmate/tokens/ERC721.sol";

import "./PuttyV2Nft.sol";
import "./PuttyV2Handler.sol";

/**
 * @title PuttyV2
 * @author out.eth
 * @notice An otc erc721 and erc20 option market.
 */
contract PuttyV2 is PuttyV2Nft, EIP712("Putty", "2.0"), ERC721TokenReceiver, Ownable {
    /* ~~~ TYPES ~~~ */

    using SafeTransferLib for ERC20;

    /**
     * @notice ERC20 asset details.
     * @param token The token address for the erc20 asset.
     * @param tokenAmount The amount of erc20 tokens.
     */
    struct ERC20Asset {
        address token;
        uint256 tokenAmount;
    }

    /**
     * @notice ERC721 asset details.
     * @param token The token address for the erc721 asset.
     * @param tokenId The token id of the erc721 assset.
     */
    struct ERC721Asset {
        address token;
        uint256 tokenId;
    }

    /**
     * @notice Order details.
     * @param maker The maker of the order.
     * @param isCall Whether or not the order is for a call or put option.
     * @param isLong Whether or not the order is long or short.
     * @param baseAsset The erc20 contract to use for the strike and premium.
     * @param strike The strike amount.
     * @param premium The premium amount.
     * @param duration The duration of the option contract (in seconds).
     * @param expiration The timestamp after which the order is no longer (unix).
     * @param nonce A random number for each order to prevent hash collisions and also check order validity.
     * @param whitelist A list of addresses that are allowed to fill this order - if empty then anyone can fill.
     * @param floorTokens A list of erc721 contract addresses for the underlying.
     * @param erc20Assets A list of erc20 assets for the underlying.
     * @param erc721Assets A list of erc721 assets for the underlying.
     */
    struct Order {
        address maker;
        bool isCall;
        bool isLong;
        address baseAsset;
        uint256 strike;
        uint256 premium;
        uint256 duration;
        uint256 expiration;
        uint256 nonce;
        address[] whitelist;
        address[] floorTokens;
        ERC20Asset[] erc20Assets;
        ERC721Asset[] erc721Assets;
    }

    /* ~~~ STATE VARIABLES ~~~ */

    /**
     * @dev ERC721Asset type hash used for EIP-712 encoding.
     */
    bytes32 public constant ERC721ASSET_TYPE_HASH = keccak256("ERC721Asset(address token,uint256 tokenId)");

    /**
     * @dev ERC20Asset type hash used for EIP-712 encoding.
     */
    bytes32 public constant ERC20ASSET_TYPE_HASH = keccak256("ERC20Asset(address token,uint256 tokenAmount)");

    /**
     * @dev ORDER_TYPE_HASH type hash used for EIP-712 encoding.
     */
    bytes32 public constant ORDER_TYPE_HASH = keccak256(
        "Order(" "address maker," "bool isCall," "bool isLong," "address baseAsset," "uint256 strike," "uint256 premium,"
        "uint256 duration," "uint256 expiration," "uint256 nonce," "address[] whitelist," "address[] floorTokens,"
        "ERC20Asset[] erc20Assets," "ERC721Asset[] erc721Assets" ")" "ERC20Asset(address token,uint256 tokenAmount)"
        "ERC721Asset(address token,uint256 tokenId)"
    );

    /**
     * @dev Contract address for Wrapped Ethereum.
     */
    address public immutable weth;

    /**
     * @dev baseURI used to generate the tokenURI for PuttyV2 NFTs.
     */
    string public baseURI;

    /**
     * @notice Fee rate that is applied on premiums.
     */
    uint256 public fee;

    /**
     * @notice Whether or not an order has been cancelled. Maps
     * from orderHash to isCancelled.
     */
    mapping(bytes32 => bool) public cancelledOrders;

    /**
     * @notice The current expiration timestamp of a position. Maps
     * from positionId to an expiration unix timestamp.
     */
    mapping(uint256 => uint256) public positionExpirations;

    /**
     * @notice Whether or not a position has been exercised. Maps
     * from positionId to isExercised.
     */
    mapping(uint256 => bool) public exercisedPositions;

    /**
     * @notice The floor asset token ids for a position. Maps from
     * positionId to floor asset token ids. This should only
     * be set for a long call position in `fillOrder`, or for
     * a short put position in `exercise`.
     */
    mapping(uint256 => uint256[]) public positionFloorAssetTokenIds;

    /**
     * @notice The total unclaimed premium fees for each asset.
     */
    mapping(address => uint256) public unclaimedFees;

    /**
     * @notice The minimum valid nonce for each address.
     */
    mapping(address => uint256) public minimumValidNonce;

    /* ~~~ EVENTS ~~~ */

    /**
     * @notice Emitted when a new base URI is set.
     * @param baseURI The new baseURI.
     */
    event NewBaseURI(string baseURI);

    /**
     * @notice Emitted when a new fee is set.
     * @param fee The new fee.
     */
    event NewFee(uint256 fee);

    /**
     * @notice Emitted when fees are withdrawn.
     * @param asset The asset which fees are being withdrawn for.
     * @param fees The amount of fees that are being withdrawn.
     * @param recipient The recipient address for the fees.
     */
    event WithdrewFees(address indexed asset, uint256 fees, address recipient);

    /**
     * @notice Emitted when an order is filled.
     * @param orderHash The hash of the order that was filled.
     * @param oppositeOrderHash The opposite hash of the order that was filled.
     * @param floorAssetTokenIds The floor asset token ids that were used.
     * @param order The order that was filled.
     */
    event FilledOrder(
        bytes32 indexed orderHash, bytes32 indexed oppositeOrderHash, uint256[] floorAssetTokenIds, Order order
    );

    /**
     * @notice Emitted when an order is exercised.
     * @param orderHash The hash of the order that was exercised.
     * @param floorAssetTokenIds The floor asset token ids that were used.
     * @param order The order that was exercised.
     */
    event ExercisedOrder(bytes32 indexed orderHash, uint256[] floorAssetTokenIds, Order order);

    /**
     * @notice Emitted when an order is withdrawn.
     * @param orderHash The hash of the order that was withdrawn.
     * @param order The order that was withdrawn.
     */
    event WithdrawOrder(bytes32 indexed orderHash, Order order);

    /**
     * @notice Emitted when an order is cancelled.
     * @param orderHash The hash of the order that was cancelled.
     * @param order The order that was cancelled.
     */
    event CancelledOrder(bytes32 indexed orderHash, Order order);

    /**
     * @notice Emitted when a user sets their minimum valid nonce.
     * @param minimumValidNonce The new minimum valid nonce.
     */
    event SetMinimumValidNonce(uint256 minimumValidNonce);

    constructor(string memory _baseURI, uint256 _fee, address _weth) {
        require(_weth != address(0), "Must set weth address");

        setBaseURI(_baseURI);
        setFee(_fee);
        weth = _weth;
    }

    /* ~~~ ADMIN FUNCTIONS ~~~ */

    /**
     * @notice Sets a new baseURI that is used in the construction
     * of the tokenURI for each NFT position. Admin/DAO only.
     * @param _baseURI The new base URI to use.
     */
    function setBaseURI(string memory _baseURI) public payable onlyOwner {
        baseURI = _baseURI;

        emit NewBaseURI(_baseURI);
    }

    /**
     * @notice Sets a new fee rate that is applied on premiums. The
     * fee has a precision of 1 decimal. e.g. 1000 = 100%,
     * 100 = 10%, 1 = 0.1%. Admin/DAO only.
     * @param _fee The new fee rate to use.
     */
    function setFee(uint256 _fee) public payable onlyOwner {
        require(_fee < 30, "fee must be less than 3%");

        fee = _fee;

        emit NewFee(_fee);
    }

    /**
     * @notice Withdraws the fees that have been collected from premiums for a particular asset.
     * @param asset The asset to collect fees for.
     * @param recipient The recipient address for the unclaimed fees.
     */
    function withdrawFees(address asset, address recipient) public payable onlyOwner {
        uint256 fees = unclaimedFees[asset];

        // reset the fees
        unclaimedFees[asset] = 0;

        emit WithdrewFees(asset, fees, recipient);

        // send the fees to the recipient
        ERC20(asset).safeTransfer(recipient, fees);
    }

    /*
        ~~~ MAIN LOGIC FUNCTIONS ~~~

        Standard lifecycle:
            [1] fillOrder()
            [2] exercise()
            [3] withdraw()

            * It is also possible to cancel() an order before fillOrder()
    */

    /**
     * @notice Fills an offchain order and settles it onchain. Mints two
     * NFTs that represent the long and short position for the order.
     * @param order The order to fill.
     * @param signature The signature for the order. Signature must recover to order.maker.
     * @param floorAssetTokenIds The floor asset token ids to use. Should only be set
     * when filling a long call order.
     * @return positionId The id of the position NFT that the msg.sender receives.
     */
    function fillOrder(Order memory order, bytes calldata signature, uint256[] memory floorAssetTokenIds)
        public
        payable
        returns (uint256 positionId)
    {
        /* ~~~ CHECKS ~~~ */

        bytes32 orderHash = hashOrder(order);

        // check signature is valid using EIP-712
        require(SignatureChecker.isValidSignatureNow(order.maker, orderHash, signature), "Invalid signature");

        // check order is not cancelled
        require(!cancelledOrders[orderHash], "Order has been cancelled");

        // check order nonce is valid
        require(order.nonce >= minimumValidNonce[order.maker], "Nonce is smaller than min");

        // check msg.sender is allowed to fill the order
        require(order.whitelist.length == 0 || isWhitelisted(order.whitelist, msg.sender), "Not whitelisted");

        // check duration is not too long
        require(order.duration <= 10_000 days, "Duration too long");

        // check duration is not too short
        require(order.duration >= 15 minutes, "Duration too short");

        // check order has not expired
        require(block.timestamp < order.expiration, "Order has expired");

        // check base asset exists
        require(order.baseAsset.code.length > 0, "baseAsset is not contract");

        // check short call doesn't have floor tokens
        if (order.isCall && !order.isLong) {
            require(order.floorTokens.length == 0, "Short call cant have floorTokens");
        }

        // check native eth is only used if baseAsset is weth
        require(msg.value == 0 || order.baseAsset == address(weth), "Cannot use native ETH");

        // check floor asset token ids length is 0 unless the order type is call and side is long
        order.isCall && order.isLong
            ? require(floorAssetTokenIds.length == order.floorTokens.length, "Wrong amount of floor tokenIds")
            : require(floorAssetTokenIds.length == 0, "Invalid floor tokens length");

        /*  ~~~ EFFECTS ~~~ */

        // create long/short position for maker
        _mint(order.maker, uint256(orderHash));

        // create opposite long/short position for taker
        bytes32 oppositeOrderHash = hashOppositeOrder(order);
        positionId = uint256(oppositeOrderHash);
        _mint(msg.sender, positionId);

        // save floorAssetTokenIds if filling a long call order
        if (order.isLong && order.isCall) {
            positionFloorAssetTokenIds[uint256(orderHash)] = floorAssetTokenIds;
        }

        // save the long position expiration
        positionExpirations[order.isLong ? uint256(orderHash) : positionId] = block.timestamp + order.duration;

        emit FilledOrder(orderHash, oppositeOrderHash, floorAssetTokenIds, order);

        /* ~~~ INTERACTIONS ~~~ */

        // calculate the fee amount
        uint256 feeAmount = 0;
        if (fee > 0) {
            feeAmount = (order.premium * fee) / 1000;
            unclaimedFees[order.baseAsset] += feeAmount;
        }

        // transfer premium to whoever is short from whomever is long
        if (order.premium > 0) {
            if (order.isLong) {
                // transfer premium to taker
                ERC20(order.baseAsset).safeTransferFrom(order.maker, msg.sender, order.premium - feeAmount);

                // collect fees
                if (feeAmount > 0) {
                    ERC20(order.baseAsset).safeTransferFrom(order.maker, address(this), feeAmount);
                }
            } else {
                // handle the case where the user uses native ETH instead of WETH to pay the premium
                if (msg.value > 0) {
                    // check enough ETH was sent to cover the premium
                    require(msg.value == order.premium, "Incorrect ETH amount sent");

                    // convert ETH to WETH and send premium to maker
                    // converting to WETH instead of forwarding native ETH to the maker has two benefits;
                    // 1) active market makers will mostly be using WETH not native ETH
                    // 2) attack surface for re-entrancy is reduced
                    IWETH(weth).deposit{value: order.premium}();

                    // collect fees and transfer to premium to maker
                    IWETH(weth).transfer(order.maker, order.premium - feeAmount);
                } else {
                    // transfer premium to maker
                    ERC20(order.baseAsset).safeTransferFrom(msg.sender, order.maker, order.premium - feeAmount);

                    // collect fees
                    if (feeAmount > 0) {
                        ERC20(order.baseAsset).safeTransferFrom(msg.sender, address(this), feeAmount);
                    }
                }
            }
        }

        if (!order.isLong && !order.isCall) {
            // filling short put: transfer strike from maker to contract
            ERC20(order.baseAsset).safeTransferFrom(order.maker, address(this), order.strike);
        } else if (order.isLong && !order.isCall) {
            // filling long put: transfer strike from taker to contract
            // handle the case where the taker uses native ETH instead of WETH to deposit the strike
            if (msg.value > 0) {
                // check enough ETH was sent to cover the strike
                require(msg.value == order.strike, "Incorrect ETH amount sent");

                // convert ETH to WETH
                // we convert the strike ETH to WETH so that the logic in exercise() works
                // - because exercise() assumes an ERC20 interface on the base asset.
                IWETH(weth).deposit{value: msg.value}();
            } else {
                ERC20(order.baseAsset).safeTransferFrom(msg.sender, address(this), order.strike);
            }
        } else if (!order.isLong && order.isCall) {
            // filling short call: transfer assets from maker to contract
            _transferERC20sIn(order.erc20Assets, order.maker);
            _transferERC721sIn(order.erc721Assets, order.maker);
        } else if (order.isLong && order.isCall) {
            // filling long call: transfer assets from taker to contract
            // long calls never need native ETH
            require(msg.value == 0, "Long call can't use native ETH");

            _transferERC20sIn(order.erc20Assets, msg.sender);
            _transferERC721sIn(order.erc721Assets, msg.sender);
            _transferFloorsIn(order.floorTokens, floorAssetTokenIds, msg.sender);
        }

        if (ERC165Checker.supportsInterface(order.maker, type(IPuttyV2Handler).interfaceId)) {
            // callback the maker with onFillOrder - save 15k gas in case of revert
            order.maker.call{gas: gasleft() - 15_000}(
                abi.encodeWithSelector(PuttyV2Handler.onFillOrder.selector, order, msg.sender, floorAssetTokenIds)
            );
        }
    }

    /**
     * @notice Exercises a long order and also burns the long position NFT which
     * represents it.
     * @param order The order of the position to exercise.
     * @param floorAssetTokenIds The floor asset token ids to use. Should only be set
     * when exercising a put order.
     */
    function exercise(Order memory order, uint256[] calldata floorAssetTokenIds) public payable {
        /* ~~~ CHECKS ~~~ */

        bytes32 orderHash = hashOrder(order);

        // check user owns the position
        require(ownerOf(uint256(orderHash)) == msg.sender, "Not owner");

        // check position is long
        require(order.isLong, "Can only exercise long positions");

        // check position has not expired
        require(block.timestamp < positionExpirations[uint256(orderHash)], "Position has expired");

        // check native eth is only used if baseAsset is weth
        require(msg.value == 0 || order.baseAsset == address(weth), "Cannot use native ETH");

        // check floor asset token ids length is 0 unless the position type is put
        !order.isCall
            ? require(floorAssetTokenIds.length == order.floorTokens.length, "Wrong amount of floor tokenIds")
            : require(floorAssetTokenIds.length == 0, "Invalid floor tokenIds length");

        /* ~~~ EFFECTS ~~~ */

        // send the long position to 0xdead.
        // instead of doing a standard burn by sending to 0x000...000, sending
        // to 0xdead ensures that the same position id cannot be minted again.
        transferFrom(msg.sender, address(0xdead), uint256(orderHash));

        // mark the position as exercised
        exercisedPositions[uint256(orderHash)] = true;

        emit ExercisedOrder(orderHash, floorAssetTokenIds, order);

        /* ~~~ INTERACTIONS ~~~ */

        uint256 shortPositionId = uint256(hashOppositeOrder(order));
        if (order.isCall) {
            // -- exercising a call option

            // transfer strike from exerciser to putty
            // handle the case where the taker uses native ETH instead of WETH to pay the strike
            if (order.strike > 0) {
                if (msg.value > 0) {
                    // check enough ETH was sent to cover the strike
                    require(msg.value == order.strike, "Incorrect ETH amount sent");

                    // convert ETH to WETH
                    // we convert the strike ETH to WETH so that the logic in withdraw() works
                    // - because withdraw() assumes an ERC20 interface on the base asset.
                    IWETH(weth).deposit{value: msg.value}();
                } else {
                    ERC20(order.baseAsset).safeTransferFrom(msg.sender, address(this), order.strike);
                }
            }

            // transfer assets from putty to exerciser
            _transferERC20sOut(order.erc20Assets);
            _transferERC721sOut(order.erc721Assets);
            _transferFloorsOut(order.floorTokens, positionFloorAssetTokenIds[uint256(orderHash)]);
        } else {
            // -- exercising a put option
            // exercising a put never needs native ETH
            require(msg.value == 0, "Puts can't use native ETH");

            // save the floor asset token ids to the short position
            positionFloorAssetTokenIds[shortPositionId] = floorAssetTokenIds;

            // transfer strike from putty to exerciser
            ERC20(order.baseAsset).safeTransfer(msg.sender, order.strike);

            // transfer assets from exerciser to putty
            _transferERC20sIn(order.erc20Assets, msg.sender);
            _transferERC721sIn(order.erc721Assets, msg.sender);
            _transferFloorsIn(order.floorTokens, floorAssetTokenIds, msg.sender);
        }

        // attempt call onExercise on the short position owner
        address shortOwner = ownerOf(shortPositionId);
        order.isLong = false;
        if (ERC165Checker.supportsInterface(shortOwner, type(IPuttyV2Handler).interfaceId)) {
            // callback the short owner with onExercise - save 15k gas in case of revert
            shortOwner.call{gas: gasleft() - 15_000}(
                abi.encodeWithSelector(PuttyV2Handler.onExercise.selector, order, msg.sender, floorAssetTokenIds)
            );
        }
    }

    /**
     * @notice Withdraws the assets from a short order and also burns the short position
     * that represents it. The assets that are withdrawn are dependent on whether
     * the order is exercised or expired and if the order is a put or call.
     * @param order The order to withdraw.
     */
    function withdraw(Order memory order) public {
        /* ~~~ CHECKS ~~~ */

        // check order is short
        require(!order.isLong, "Must be short position");

        bytes32 orderHash = hashOrder(order);

        // check msg.sender owns the position
        require(ownerOf(uint256(orderHash)) == msg.sender, "Not owner");

        uint256 longPositionId = uint256(hashOppositeOrder(order));
        bool isExercised = exercisedPositions[longPositionId];

        // check long position has either been exercised or is expired
        require(isExercised || block.timestamp > positionExpirations[longPositionId], "Must be exercised or expired");

        /* ~~~ EFFECTS ~~~ */

        // send the short position to 0xdead.
        // instead of doing a standard burn by sending to 0x000...000, sending
        // to 0xdead ensures that the same position id cannot be minted again.
        transferFrom(msg.sender, address(0xdead), uint256(orderHash));

        emit WithdrawOrder(orderHash, order);

        /* ~~~ INTERACTIONS ~~~ */

        // transfer strike to owner if put is expired or call is exercised
        if ((order.isCall && isExercised) || (!order.isCall && !isExercised)) {
            ERC20(order.baseAsset).safeTransfer(msg.sender, order.strike);
            return;
        }

        // transfer assets from putty to owner if put is exercised or call is expired
        if ((order.isCall && !isExercised) || (!order.isCall && isExercised)) {
            _transferERC20sOut(order.erc20Assets);
            _transferERC721sOut(order.erc721Assets);

            // for call options the floor token ids are saved in the long position in fillOrder(),
            // and for put options the floor tokens ids are saved in the short position in exercise()
            uint256 floorPositionId = order.isCall ? longPositionId : uint256(orderHash);
            _transferFloorsOut(order.floorTokens, positionFloorAssetTokenIds[floorPositionId]);

            return;
        }
    }

    /**
     * @notice Cancels an order which prevents it from being filled in the future.
     * @param order The order to cancel.
     */
    function cancel(Order memory order) public {
        require(msg.sender == order.maker, "Not your order");

        bytes32 orderHash = hashOrder(order);
        require(_ownerOf[uint256(orderHash)] == address(0), "Order already filled");

        // mark the order as cancelled
        cancelledOrders[orderHash] = true;

        emit CancelledOrder(orderHash, order);
    }

    /* ~~~ PERIPHERY LOGIC FUNCTIONS ~~~ */

    /**
     * @notice Batch fills multiple orders.
     * @dev Purposefully marked as non-payable otherwise the msg.value can be used multiple times in fillOrder.
     * @param orders The orders to fill.
     * @param signatures The signatures to use for each respective order.
     * @param floorAssetTokenIds The floorAssetTokenIds to use for each respective order.
     * @return positionIds The ids of the position NFT that the msg.sender receives.
     */
    function batchFillOrder(Order[] memory orders, bytes[] calldata signatures, uint256[][] memory floorAssetTokenIds)
        public
        returns (uint256[] memory positionIds)
    {
        require(
            orders.length == signatures.length && signatures.length == floorAssetTokenIds.length,
            "Length mismatch in input"
        );

        positionIds = new uint256[](orders.length);

        for (uint256 i = 0; i < orders.length; i++) {
            positionIds[i] = fillOrder(orders[i], signatures[i], floorAssetTokenIds[i]);
        }
    }

    /**
     * @notice Accepts a counter offer for an order. It cancels the original order that the counter
     * offer was made for and then it fills the counter offer.
     * @dev There is no need for floorTokenIds here because there is no situation in which
     * it makes sense to have them when accepting counter offers; When accepting a counter
     * offer for a short call order, the complementary long call order already knows what
     * tokenIds are used in the short call so floorTokens should always be empty.
     * @param order The counter offer to accept.
     * @param signature The signature for the counter offer.
     * @param originalOrder The original order that the counter was made for.
     * @return positionId The id of the position NFT that the msg.sender receives.
     */
    function acceptCounterOffer(Order memory order, bytes calldata signature, Order memory originalOrder)
        public
        payable
        returns (uint256 positionId)
    {
        // cancel the original order
        cancel(originalOrder);

        // accept the counter offer
        uint256[] memory floorAssetTokenIds = new uint256[](0);
        positionId = fillOrder(order, signature, floorAssetTokenIds);
    }

    /**
     * @notice Sets the minimum valid nonce for a user. Any unfilled orders with a nonce
     * smaller than this minimum will no longer be valid and will unable to be filled.
     * @param _minimumValidNonce The new minimum valid nonce.
     */
    function setMinimumValidNonce(uint256 _minimumValidNonce) public {
        require(_minimumValidNonce > minimumValidNonce[msg.sender], "Nonce should increase");
        minimumValidNonce[msg.sender] = _minimumValidNonce;

        emit SetMinimumValidNonce(_minimumValidNonce);
    }

    /* ~~~ HELPER FUNCTIONS ~~~ */

    /**
     * @notice Transfers an array of erc20s into the contract from an address.
     * @param assets The erc20 tokens and amounts to transfer in.
     * @param from Who to transfer the erc20 assets from.
     */
    function _transferERC20sIn(ERC20Asset[] memory assets, address from) internal {
        for (uint256 i = 0; i < assets.length; i++) {
            address token = assets[i].token;
            uint256 tokenAmount = assets[i].tokenAmount;

            require(token.code.length > 0, "ERC20: Token is not contract");

            if (tokenAmount > 0) {
                ERC20(token).safeTransferFrom(from, address(this), tokenAmount);
            }
        }
    }

    /**
     * @notice Transfers an array of erc721s into the contract from an address.
     * @param assets The erc721 tokens and token ids to transfer in.
     * @param from Who to transfer the erc721 assets from.
     */
    function _transferERC721sIn(ERC721Asset[] memory assets, address from) internal {
        for (uint256 i = 0; i < assets.length; i++) {
            ERC721(assets[i].token).safeTransferFrom(from, address(this), assets[i].tokenId);
        }
    }

    /**
     * @notice Transfers an array of erc721 floor tokens into the contract from an address.
     * @param floorTokens The contract addresses of each erc721.
     * @param floorTokenIds The token id of each erc721.
     * @param from Who to transfer the floor tokens from.
     */
    function _transferFloorsIn(address[] memory floorTokens, uint256[] memory floorTokenIds, address from) internal {
        for (uint256 i = 0; i < floorTokens.length; i++) {
            ERC721(floorTokens[i]).safeTransferFrom(from, address(this), floorTokenIds[i]);
        }
    }

    /**
     * @notice Transfers an array of erc20 tokens to the msg.sender.
     * @param assets The erc20 tokens and amounts to send.
     */
    function _transferERC20sOut(ERC20Asset[] memory assets) internal {
        for (uint256 i = 0; i < assets.length; i++) {
            if (assets[i].tokenAmount > 0) {
                ERC20(assets[i].token).safeTransfer(msg.sender, assets[i].tokenAmount);
            }
        }
    }

    /**
     * @notice Transfers an array of erc721 tokens to the msg.sender.
     * @param assets The erc721 tokens and token ids to send.
     */
    function _transferERC721sOut(ERC721Asset[] memory assets) internal {
        for (uint256 i = 0; i < assets.length; i++) {
            ERC721(assets[i].token).safeTransferFrom(address(this), msg.sender, assets[i].tokenId);
        }
    }

    /**
     * @notice Transfers an array of erc721 floor tokens to the msg.sender.
     * @param floorTokens The contract addresses for each floor token.
     * @param floorTokenIds The token id of each floor token.
     */
    function _transferFloorsOut(address[] memory floorTokens, uint256[] memory floorTokenIds) internal {
        for (uint256 i = 0; i < floorTokens.length; i++) {
            ERC721(floorTokens[i]).safeTransferFrom(address(this), msg.sender, floorTokenIds[i]);
        }
    }

    /**
     * @notice Checks whether or not an address exists in the whitelist.
     * @param whitelist The whitelist to check against.
     * @param target The target address to check.
     * @return If it exists in the whitelist or not.
     */
    function isWhitelisted(address[] memory whitelist, address target) public pure returns (bool) {
        for (uint256 i = 0; i < whitelist.length; i++) {
            if (target == whitelist[i]) {
                return true;
            }
        }

        return false;
    }

    /**
     * @notice Get the orderHash for a complementary short/long order - e.g for a long order,
     * this returns the hash of its opposite short order.
     * @param order The order to find the complementary long/short hash for.
     * @return orderHash The hash of the opposite order.
     */
    function hashOppositeOrder(Order memory order) public view returns (bytes32 orderHash) {
        // use decode/encode to get a copy instead of reference
        Order memory oppositeOrder = abi.decode(abi.encode(order), (Order));

        // get the opposite side of the order (short/long)
        oppositeOrder.isLong = !order.isLong;
        orderHash = hashOrder(oppositeOrder);
    }

    /* ~~~ EIP-712 HELPERS ~~~ */

    /**
     * @notice Hashes an order based on the eip-712 encoding scheme.
     * @param order The order to hash.
     * @return orderHash The eip-712 compliant hash of the order.
     */
    function hashOrder(Order memory order) public view returns (bytes32 orderHash) {
        orderHash = keccak256(
            abi.encode(
                ORDER_TYPE_HASH,
                order.maker,
                order.isCall,
                order.isLong,
                order.baseAsset,
                order.strike,
                order.premium,
                order.duration,
                order.expiration,
                order.nonce,
                keccak256(abi.encodePacked(order.whitelist)),
                keccak256(abi.encodePacked(order.floorTokens)),
                keccak256(encodeERC20Assets(order.erc20Assets)),
                keccak256(encodeERC721Assets(order.erc721Assets))
            )
        );

        orderHash = _hashTypedDataV4(orderHash);
    }

    /**
     * @notice Encodes an array of erc20 assets following the eip-712 encoding scheme.
     * @param arr Array of erc20 assets to hash.
     * @return encoded The eip-712 encoded array of erc20 assets.
     */
    function encodeERC20Assets(ERC20Asset[] memory arr) public pure returns (bytes memory encoded) {
        for (uint256 i = 0; i < arr.length; i++) {
            encoded =
                abi.encodePacked(encoded, keccak256(abi.encode(ERC20ASSET_TYPE_HASH, arr[i].token, arr[i].tokenAmount)));
        }
    }

    /**
     * @notice Encodes an array of erc721 assets following the eip-712 encoding scheme.
     * @param arr Array of erc721 assets to hash.
     * @return encoded The eip-712 encoded array of erc721 assets.
     */
    function encodeERC721Assets(ERC721Asset[] memory arr) public pure returns (bytes memory encoded) {
        for (uint256 i = 0; i < arr.length; i++) {
            encoded =
                abi.encodePacked(encoded, keccak256(abi.encode(ERC721ASSET_TYPE_HASH, arr[i].token, arr[i].tokenId)));
        }
    }

    /**
     * @return The domain separator used when calculating the eip-712 hash.
     */
    function domainSeparatorV4() public view returns (bytes32) {
        return _domainSeparatorV4();
    }

    /* ~~~ OVERRIDES ~~~ */

    /**
     * @notice Gets the token URI for an NFT.
     * @param id The id of the position NFT.
     * @return The tokenURI of the position NFT.
     */
    function tokenURI(uint256 id) public view override returns (string memory) {
        require(_ownerOf[id] != address(0), "URI query for NOT_MINTED token");

        return string.concat(baseURI, Strings.toString(id));
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.16;

interface IWETH {
    event Approval(address indexed src, address indexed guy, uint256 wad);
    event Transfer(address indexed src, address indexed dst, uint256 wad);
    event Deposit(address indexed dst, uint256 wad);
    event Withdrawal(address indexed src, uint256 wad);

    function deposit() external payable;

    function withdraw(uint256 wad) external;

    function totalSupply() external view returns (uint256);

    function approve(address guy, uint256 wad) external returns (bool);

    function transfer(address dst, uint256 wad) external returns (bool);

    function transferFrom(address src, address dst, uint256 wad) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/cryptography/SignatureChecker.sol)

pragma solidity ^0.8.0;

import "./ECDSA.sol";
import "../Address.sol";
import "../../interfaces/IERC1271.sol";

/**
 * @dev Signature verification helper that can be used instead of `ECDSA.recover` to seamlessly support both ECDSA
 * signatures from externally owned accounts (EOAs) as well as ERC1271 signatures from smart contract wallets like
 * Argent and Gnosis Safe.
 *
 * _Available since v4.1._
 */
library SignatureChecker {
    /**
     * @dev Checks if a signature is valid for a given signer and data hash. If the signer is a smart contract, the
     * signature is validated against that smart contract using ERC1271, otherwise it's validated using `ECDSA.recover`.
     *
     * NOTE: Unlike ECDSA signatures, contract signatures are revocable, and the outcome of this function can thus
     * change through time. It could return true at block N and false at block N+1 (or the opposite).
     */
    function isValidSignatureNow(
        address signer,
        bytes32 hash,
        bytes memory signature
    ) internal view returns (bool) {
        (address recovered, ECDSA.RecoverError error) = ECDSA.tryRecover(hash, signature);
        if (error == ECDSA.RecoverError.NoError && recovered == signer) {
            return true;
        }

        (bool success, bytes memory result) = signer.staticcall(
            abi.encodeWithSelector(IERC1271.isValidSignature.selector, hash, signature)
        );
        return (success &&
            result.length == 32 &&
            abi.decode(result, (bytes32)) == bytes32(IERC1271.isValidSignature.selector));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/cryptography/draft-EIP712.sol)

pragma solidity ^0.8.0;

import "./ECDSA.sol";

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * _Available since v3.4._
 */
abstract contract EIP712 {
    /* solhint-disable var-name-mixedcase */
    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
    // invalidate the cached domain separator if the chain id changes.
    bytes32 private immutable _CACHED_DOMAIN_SEPARATOR;
    uint256 private immutable _CACHED_CHAIN_ID;
    address private immutable _CACHED_THIS;

    bytes32 private immutable _HASHED_NAME;
    bytes32 private immutable _HASHED_VERSION;
    bytes32 private immutable _TYPE_HASH;

    /* solhint-enable var-name-mixedcase */

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        bytes32 hashedName = keccak256(bytes(name));
        bytes32 hashedVersion = keccak256(bytes(version));
        bytes32 typeHash = keccak256(
            "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
        );
        _HASHED_NAME = hashedName;
        _HASHED_VERSION = hashedVersion;
        _CACHED_CHAIN_ID = block.chainid;
        _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion);
        _CACHED_THIS = address(this);
        _TYPE_HASH = typeHash;
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (address(this) == _CACHED_THIS && block.chainid == _CACHED_CHAIN_ID) {
            return _CACHED_DOMAIN_SEPARATOR;
        } else {
            return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION);
        }
    }

    function _buildDomainSeparator(
        bytes32 typeHash,
        bytes32 nameHash,
        bytes32 versionHash
    ) private view returns (bytes32) {
        return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this)));
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
    }
}

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

pragma solidity ^0.8.0;

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

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165Checker.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Library used to query support of an interface declared via {IERC165}.
 *
 * Note that these functions return the actual result of the query: they do not
 * `revert` if an interface is not supported. It is up to the caller to decide
 * what to do in these cases.
 */
library ERC165Checker {
    // As per the EIP-165 spec, no interface should ever match 0xffffffff
    bytes4 private constant _INTERFACE_ID_INVALID = 0xffffffff;

    /**
     * @dev Returns true if `account` supports the {IERC165} interface,
     */
    function supportsERC165(address account) internal view returns (bool) {
        // Any contract that implements ERC165 must explicitly indicate support of
        // InterfaceId_ERC165 and explicitly indicate non-support of InterfaceId_Invalid
        return
            supportsERC165InterfaceUnchecked(account, type(IERC165).interfaceId) &&
            !supportsERC165InterfaceUnchecked(account, _INTERFACE_ID_INVALID);
    }

    /**
     * @dev Returns true if `account` supports the interface defined by
     * `interfaceId`. Support for {IERC165} itself is queried automatically.
     *
     * See {IERC165-supportsInterface}.
     */
    function supportsInterface(address account, bytes4 interfaceId) internal view returns (bool) {
        // query support of both ERC165 as per the spec and support of _interfaceId
        return supportsERC165(account) && supportsERC165InterfaceUnchecked(account, interfaceId);
    }

    /**
     * @dev Returns a boolean array where each value corresponds to the
     * interfaces passed in and whether they're supported or not. This allows
     * you to batch check interfaces for a contract where your expectation
     * is that some interfaces may not be supported.
     *
     * See {IERC165-supportsInterface}.
     *
     * _Available since v3.4._
     */
    function getSupportedInterfaces(address account, bytes4[] memory interfaceIds)
        internal
        view
        returns (bool[] memory)
    {
        // an array of booleans corresponding to interfaceIds and whether they're supported or not
        bool[] memory interfaceIdsSupported = new bool[](interfaceIds.length);

        // query support of ERC165 itself
        if (supportsERC165(account)) {
            // query support of each interface in interfaceIds
            for (uint256 i = 0; i < interfaceIds.length; i++) {
                interfaceIdsSupported[i] = supportsERC165InterfaceUnchecked(account, interfaceIds[i]);
            }
        }

        return interfaceIdsSupported;
    }

    /**
     * @dev Returns true if `account` supports all the interfaces defined in
     * `interfaceIds`. Support for {IERC165} itself is queried automatically.
     *
     * Batch-querying can lead to gas savings by skipping repeated checks for
     * {IERC165} support.
     *
     * See {IERC165-supportsInterface}.
     */
    function supportsAllInterfaces(address account, bytes4[] memory interfaceIds) internal view returns (bool) {
        // query support of ERC165 itself
        if (!supportsERC165(account)) {
            return false;
        }

        // query support of each interface in _interfaceIds
        for (uint256 i = 0; i < interfaceIds.length; i++) {
            if (!supportsERC165InterfaceUnchecked(account, interfaceIds[i])) {
                return false;
            }
        }

        // all interfaces supported
        return true;
    }

    /**
     * @notice Query if a contract implements an interface, does not check ERC165 support
     * @param account The address of the contract to query for support of an interface
     * @param interfaceId The interface identifier, as specified in ERC-165
     * @return true if the contract at account indicates support of the interface with
     * identifier interfaceId, false otherwise
     * @dev Assumes that account contains a contract that supports ERC165, otherwise
     * the behavior of this method is undefined. This precondition can be checked
     * with {supportsERC165}.
     * Interface identification is specified in ERC-165.
     */
    function supportsERC165InterfaceUnchecked(address account, bytes4 interfaceId) internal view returns (bool) {
        // prepare call
        bytes memory encodedParams = abi.encodeWithSelector(IERC165.supportsInterface.selector, interfaceId);

        // perform static call
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly {
            success := staticcall(30000, account, add(encodedParams, 0x20), mload(encodedParams), 0x00, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0x00)
        }

        return success && returnSize >= 0x20 && returnValue > 0;
    }
}

// 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 anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

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

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

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

import {ERC20} from "../tokens/ERC20.sol";

/// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/utils/SafeTransferLib.sol)
/// @dev Use with caution! Some functions in this library knowingly create dirty bits at the destination of the free memory pointer.
/// @dev Note that none of the functions in this library check that a token has code at all! That responsibility is delegated to the caller.
library SafeTransferLib {
    /*//////////////////////////////////////////////////////////////
                             ETH OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferETH(address to, uint256 amount) internal {
        bool success;

        assembly {
            // Transfer the ETH and store if it succeeded or not.
            success := call(gas(), to, amount, 0, 0, 0, 0)
        }

        require(success, "ETH_TRANSFER_FAILED");
    }

    /*//////////////////////////////////////////////////////////////
                            ERC20 OPERATIONS
    //////////////////////////////////////////////////////////////*/

    function safeTransferFrom(
        ERC20 token,
        address from,
        address to,
        uint256 amount
    ) internal {
        bool success;

        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x23b872dd00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), from) // Append the "from" argument.
            mstore(add(freeMemoryPointer, 36), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 68), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 100 because the length of our calldata totals up like so: 4 + 32 * 3.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 100, 0, 32)
            )
        }

        require(success, "TRANSFER_FROM_FAILED");
    }

    function safeTransfer(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0xa9059cbb00000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "TRANSFER_FAILED");
    }

    function safeApprove(
        ERC20 token,
        address to,
        uint256 amount
    ) internal {
        bool success;

        assembly {
            // Get a pointer to some free memory.
            let freeMemoryPointer := mload(0x40)

            // Write the abi-encoded calldata into memory, beginning with the function selector.
            mstore(freeMemoryPointer, 0x095ea7b300000000000000000000000000000000000000000000000000000000)
            mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument.
            mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument.

            success := and(
                // Set success to whether the call reverted, if not we check it either
                // returned exactly 1 (can't just be non-zero data), or had no return data.
                or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())),
                // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2.
                // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space.
                // Counterintuitively, this call must be positioned second to the or() call in the
                // surrounding and() call or else returndatasize() will be zero during the computation.
                call(gas(), token, 0, freeMemoryPointer, 68, 0, 32)
            )
        }

        require(success, "APPROVE_FAILED");
    }
}

// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Modern, minimalist, and gas efficient ERC-721 implementation.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/tokens/ERC721.sol)
abstract contract ERC721 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Transfer(address indexed from, address indexed to, uint256 indexed id);

    event Approval(address indexed owner, address indexed spender, uint256 indexed id);

    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /*//////////////////////////////////////////////////////////////
                         METADATA STORAGE/LOGIC
    //////////////////////////////////////////////////////////////*/

    string public name;

    string public symbol;

    function tokenURI(uint256 id) public view virtual returns (string memory);

    /*//////////////////////////////////////////////////////////////
                      ERC721 BALANCE/OWNER STORAGE
    //////////////////////////////////////////////////////////////*/

    mapping(uint256 => address) internal _ownerOf;

    mapping(address => uint256) internal _balanceOf;

    function ownerOf(uint256 id) public view virtual returns (address owner) {
        require((owner = _ownerOf[id]) != address(0), "NOT_MINTED");
    }

    function balanceOf(address owner) public view virtual returns (uint256) {
        require(owner != address(0), "ZERO_ADDRESS");

        return _balanceOf[owner];
    }

    /*//////////////////////////////////////////////////////////////
                         ERC721 APPROVAL STORAGE
    //////////////////////////////////////////////////////////////*/

    mapping(uint256 => address) public getApproved;

    mapping(address => mapping(address => bool)) public isApprovedForAll;

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(string memory _name, string memory _symbol) {
        name = _name;
        symbol = _symbol;
    }

    /*//////////////////////////////////////////////////////////////
                              ERC721 LOGIC
    //////////////////////////////////////////////////////////////*/

    function approve(address spender, uint256 id) public virtual {
        address owner = _ownerOf[id];

        require(msg.sender == owner || isApprovedForAll[owner][msg.sender], "NOT_AUTHORIZED");

        getApproved[id] = spender;

        emit Approval(owner, spender, id);
    }

    function setApprovalForAll(address operator, bool approved) public virtual {
        isApprovedForAll[msg.sender][operator] = approved;

        emit ApprovalForAll(msg.sender, operator, approved);
    }

    function transferFrom(
        address from,
        address to,
        uint256 id
    ) public virtual {
        require(from == _ownerOf[id], "WRONG_FROM");

        require(to != address(0), "INVALID_RECIPIENT");

        require(
            msg.sender == from || isApprovedForAll[from][msg.sender] || msg.sender == getApproved[id],
            "NOT_AUTHORIZED"
        );

        // Underflow of the sender's balance is impossible because we check for
        // ownership above and the recipient's balance can't realistically overflow.
        unchecked {
            _balanceOf[from]--;

            _balanceOf[to]++;
        }

        _ownerOf[id] = to;

        delete getApproved[id];

        emit Transfer(from, to, id);
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 id
    ) public virtual {
        transferFrom(from, to, id);

        require(
            to.code.length == 0 ||
                ERC721TokenReceiver(to).onERC721Received(msg.sender, from, id, "") ==
                ERC721TokenReceiver.onERC721Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }

    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        bytes calldata data
    ) public virtual {
        transferFrom(from, to, id);

        require(
            to.code.length == 0 ||
                ERC721TokenReceiver(to).onERC721Received(msg.sender, from, id, data) ==
                ERC721TokenReceiver.onERC721Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }

    /*//////////////////////////////////////////////////////////////
                              ERC165 LOGIC
    //////////////////////////////////////////////////////////////*/

    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return
            interfaceId == 0x01ffc9a7 || // ERC165 Interface ID for ERC165
            interfaceId == 0x80ac58cd || // ERC165 Interface ID for ERC721
            interfaceId == 0x5b5e139f; // ERC165 Interface ID for ERC721Metadata
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address to, uint256 id) internal virtual {
        require(to != address(0), "INVALID_RECIPIENT");

        require(_ownerOf[id] == address(0), "ALREADY_MINTED");

        // Counter overflow is incredibly unrealistic.
        unchecked {
            _balanceOf[to]++;
        }

        _ownerOf[id] = to;

        emit Transfer(address(0), to, id);
    }

    function _burn(uint256 id) internal virtual {
        address owner = _ownerOf[id];

        require(owner != address(0), "NOT_MINTED");

        // Ownership check above ensures no underflow.
        unchecked {
            _balanceOf[owner]--;
        }

        delete _ownerOf[id];

        delete getApproved[id];

        emit Transfer(owner, address(0), id);
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL SAFE MINT LOGIC
    //////////////////////////////////////////////////////////////*/

    function _safeMint(address to, uint256 id) internal virtual {
        _mint(to, id);

        require(
            to.code.length == 0 ||
                ERC721TokenReceiver(to).onERC721Received(msg.sender, address(0), id, "") ==
                ERC721TokenReceiver.onERC721Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }

    function _safeMint(
        address to,
        uint256 id,
        bytes memory data
    ) internal virtual {
        _mint(to, id);

        require(
            to.code.length == 0 ||
                ERC721TokenReceiver(to).onERC721Received(msg.sender, address(0), id, data) ==
                ERC721TokenReceiver.onERC721Received.selector,
            "UNSAFE_RECIPIENT"
        );
    }
}

/// @notice A generic interface for a contract which properly accepts ERC721 tokens.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/tokens/ERC721.sol)
abstract contract ERC721TokenReceiver {
    function onERC721Received(
        address,
        address,
        uint256,
        bytes calldata
    ) external virtual returns (bytes4) {
        return ERC721TokenReceiver.onERC721Received.selector;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.16;

import "solmate/tokens/ERC721.sol";

// removes balanceOf modifications
// questionable tradeoff but given our use-case it's reasonable
abstract contract PuttyV2Nft is ERC721("Putty", "OPUT") {
    // remove balanceOf modifications
    function _mint(address to, uint256 id) internal override {
        require(to != address(0), "INVALID_RECIPIENT");
        require(_ownerOf[id] == address(0), "ALREADY_MINTED");

        _ownerOf[id] = to;

        emit Transfer(address(0), to, id);
    }

    // remove balanceOf modifications
    function transferFrom(address from, address to, uint256 id) public override {
        require(from == _ownerOf[id], "WRONG_FROM");
        require(to != address(0), "INVALID_RECIPIENT");
        require(
            msg.sender == from || isApprovedForAll[from][msg.sender] || msg.sender == getApproved[id], "NOT_AUTHORIZED"
        );

        _ownerOf[id] = to;
        delete getApproved[id];

        emit Transfer(from, to, id);
    }

    // set balanceOf to max for all users
    function balanceOf(address owner) public pure override returns (uint256) {
        require(owner != address(0), "ZERO_ADDRESS");
        return type(uint256).max;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.16;

import "./PuttyV2.sol";

interface IPuttyV2Handler {
    function onFillOrder(PuttyV2.Order memory order, address taker, uint256[] memory floorAssetTokenIds) external;

    function onExercise(PuttyV2.Order memory order, address exerciser, uint256[] memory floorAssetTokenIds) external;
}

contract PuttyV2Handler {
    function onFillOrder(PuttyV2.Order memory order, address taker, uint256[] memory floorAssetTokenIds)
        public
        virtual
    {}

    function onExercise(PuttyV2.Order memory order, address exerciser, uint256[] memory floorAssetTokenIds)
        public
        virtual
    {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 27);
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

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

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC1271.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC1271 standard signature validation method for
 * contracts as defined in https://eips.ethereum.org/EIPS/eip-1271[ERC-1271].
 *
 * _Available since v4.1._
 */
interface IERC1271 {
    /**
     * @dev Should return whether the signature provided is valid for the provided data
     * @param hash      Hash of the data to be signed
     * @param signature Signature byte array associated with _data
     */
    function isValidSignature(bytes32 hash, bytes memory signature) external view returns (bytes4 magicValue);
}

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

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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: AGPL-3.0-only
pragma solidity >=0.8.0;

/// @notice Modern and gas efficient ERC20 + EIP-2612 implementation.
/// @author Solmate (https://github.com/Rari-Capital/solmate/blob/main/src/tokens/ERC20.sol)
/// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol)
/// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it.
abstract contract ERC20 {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/

    event Transfer(address indexed from, address indexed to, uint256 amount);

    event Approval(address indexed owner, address indexed spender, uint256 amount);

    /*//////////////////////////////////////////////////////////////
                            METADATA STORAGE
    //////////////////////////////////////////////////////////////*/

    string public name;

    string public symbol;

    uint8 public immutable decimals;

    /*//////////////////////////////////////////////////////////////
                              ERC20 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;

    mapping(address => mapping(address => uint256)) public allowance;

    /*//////////////////////////////////////////////////////////////
                            EIP-2612 STORAGE
    //////////////////////////////////////////////////////////////*/

    uint256 internal immutable INITIAL_CHAIN_ID;

    bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;

    mapping(address => uint256) public nonces;

    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/

    constructor(
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;

        INITIAL_CHAIN_ID = block.chainid;
        INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator();
    }

    /*//////////////////////////////////////////////////////////////
                               ERC20 LOGIC
    //////////////////////////////////////////////////////////////*/

    function approve(address spender, uint256 amount) public virtual returns (bool) {
        allowance[msg.sender][spender] = amount;

        emit Approval(msg.sender, spender, amount);

        return true;
    }

    function transfer(address to, uint256 amount) public virtual returns (bool) {
        balanceOf[msg.sender] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(msg.sender, to, amount);

        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual returns (bool) {
        uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals.

        if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount;

        balanceOf[from] -= amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(from, to, amount);

        return true;
    }

    /*//////////////////////////////////////////////////////////////
                             EIP-2612 LOGIC
    //////////////////////////////////////////////////////////////*/

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual {
        require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED");

        // Unchecked because the only math done is incrementing
        // the owner's nonce which cannot realistically overflow.
        unchecked {
            address recoveredAddress = ecrecover(
                keccak256(
                    abi.encodePacked(
                        "\x19\x01",
                        DOMAIN_SEPARATOR(),
                        keccak256(
                            abi.encode(
                                keccak256(
                                    "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"
                                ),
                                owner,
                                spender,
                                value,
                                nonces[owner]++,
                                deadline
                            )
                        )
                    )
                ),
                v,
                r,
                s
            );

            require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER");

            allowance[recoveredAddress][spender] = value;
        }

        emit Approval(owner, spender, value);
    }

    function DOMAIN_SEPARATOR() public view virtual returns (bytes32) {
        return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator();
    }

    function computeDomainSeparator() internal view virtual returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256("1"),
                    block.chainid,
                    address(this)
                )
            );
    }

    /*//////////////////////////////////////////////////////////////
                        INTERNAL MINT/BURN LOGIC
    //////////////////////////////////////////////////////////////*/

    function _mint(address to, uint256 amount) internal virtual {
        totalSupply += amount;

        // Cannot overflow because the sum of all user
        // balances can't exceed the max uint256 value.
        unchecked {
            balanceOf[to] += amount;
        }

        emit Transfer(address(0), to, amount);
    }

    function _burn(address from, uint256 amount) internal virtual {
        balanceOf[from] -= amount;

        // Cannot underflow because a user's balance
        // will never be larger than the total supply.
        unchecked {
            totalSupply -= amount;
        }

        emit Transfer(from, address(0), amount);
    }
}

{
  "remappings": [
    "ds-test/=lib/solmate/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin/=lib/openzeppelin-contracts/contracts/",
    "solmate/=lib/solmate/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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-----Decoded View---------------
Arg [0] : _baseURI (string): https://api.putty.finance/metadata/
Arg [1] : _fee (uint256): 0
Arg [2] : _weth (address): 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [2] : 000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000023
Arg [4] : 68747470733a2f2f6170692e70757474792e66696e616e63652f6d6574616461
Arg [5] : 74612f0000000000000000000000000000000000000000000000000000000000