// SPDX-License-Identifier: CC0-1.0
pragma solidity 0.8.21;
/// @title Gnars HD
/// @notice High definition Gnars counterparts
/// @author Volky
/// @dev This contract describes Gnars HD as 1:1 counterparts for each GnarV2. They are not mintable, since the ownership of the respective GnarV2 is mirrored on the GnarHD.
///
////////////////////////////////////////////////////////////////////////////////////////////
//                                                                                        //
//                                                                                        //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▀       ▀▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▀   ▄▄░░░░▄   ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▀▀       ▀▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▀  ▄▒░░░░░░░░░▌  ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▀  ▄▐▒░░░░   ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▀  ▀░▐░░░░░░░░▌▐  ▐▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓  ▄▒░░░░░░░▐   ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓   ▌░ ░░░░░░░░░░▓  ▐▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓  ▄░░░░░░░░░▌▌  ▐▓▓▓▓▓▓▓▓▓▓▓▓▓▌  ▄▒ ▒░░░░░░░░░░▌  ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓  ▐░ ░░░░░░▐▐▌▌  ▐▓▓▓▓▓▓▓▓▓▓▓▓▓   ░ ▐░░░░░░░░░░▓   ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓  ▌ ▐░░░░░░░░░▓   ▓▓▓▓▓▓▓▓▓▓▓▓   ▓▒ ░░░░░░░░░░▐   ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▌  ▒ ░░░░░░░░░░▐   ▓▓▓▓▓▓▓▓▓▓▓▓   ▌░▒░░░░░░░░░░▌  ▐▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▌  ▒ ░░░░░░░░░░▐   ▓▓▀▀▀         ▐░ ░░░░░░░░░░▐   ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▌  ▒ ▐░░░░░░░░░░        ▄▄▄▄▄▄▄▄▄▐░░░░░░░░░░░░▌  ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▌  ▌░▐░░░░░░░░░░▌   ▐░ ░░░░░░░░░░▌░░░░░░░░░░░▐  ▐▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓  ▐░ ▒░░░░░░░░░░▄▄░░░░░░░░░░░░░░▌░░░░░░░░░░▌▌  ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▌  ▌▒░░░░░░░░░░░▓░░░░░░░░░░░░░░░▌░░░░░░░░░░▒▌  ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓   ▒░░░░░░░░░░░▌░░░░░▄▄▀▀▀▀▀▀▀▀▀▒░░░░░░░░░▀▄   ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▌  ▐░░░░░░░░░░░▌░░░░▀░░░░░░░░░░░░░░░░░░░░░░░░▌  ▀▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▌  ▐░░░░░░░░░░▒░░░▌▒▒░░░░░░░░░░░░░░░░░░░░░░░░▀  ▐▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓  ▐░░░░░░░░░▒░░░▌▄▐░░░░░░░░░░░░░░░░░░░░░░░░▒▌  ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓   ▒░░░░░░░░▓░░░░▓░▄░▀▒░░░░░░░░░░░░░░░░░░░▒▐▐  ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓   ░░░░░░░░░░▌░░░░░▀▀▒▄▄▄▄▄▄▄▓▀▀▒░░░░░░░░░░░▐  ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓  ▐░░░░░░░░░░░▒▀▄▄░▄▄░▀░░░░░░░░░░░░░░░░░░░░░▌  ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓  ▐░░░░░░░░░░░░░░░░▓░░░░░░░░░░░░░░░░░░░░░░░▌  ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓   ▒░░░░░░░░░░░░░░░▒░░░░░░░░░░░░░░░░░░░░░░▀  ▐▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓  ▐░░░░░░░░░░░░░░░▒░░░░░░░░░░░░░░░░░░░░▄▀  ▄▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▌   ▒░░░░░░░░░░░░░▀▒░░░░░░░░░░░░░░░░░▒▀  ▄▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓   █▀▀▄▄▄░░░░░░░░░▀▄░░░░░░░░░░░▄▄█   ▄▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▌  ▐░░░░░░░░░░░░░░░░░▒▀▀▀▀▀▀▒░░░░▐   ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓   ▀░░░░░░░░░░░░░░░░░░░░░░░░░▄▀  ▄▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▄   ▀▀▒▄░░░░░░░░░░░░░░░▒▀▀   ▄▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▄                     ▄▄▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▄▄▄▄▄▄▄▄▄▄▄▄▄▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//    ▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓    //
//                                                                                        //
//              ░██████╗░███╗░░██╗░█████╗░██████╗░░██████╗  ██╗░░██╗██████╗░              //
//              ██╔════╝░████╗░██║██╔══██╗██╔══██╗██╔════╝  ██║░░██║██╔══██╗              //
//              ██║░░██╗░██╔██╗██║███████║██████╔╝╚█████╗░  ███████║██║░░██║              //
//              ██║░░╚██╗██║╚████║██╔══██║██╔══██╗░╚═══██╗  ██╔══██║██║░░██║              //
//              ╚██████╔╝██║░╚███║██║░░██║██║░░██║██████╔╝  ██║░░██║██████╔╝              //
//              ░╚═════╝░╚═╝░░╚══╝╚═╝░░╚═╝╚═╝░░╚═╝╚═════╝░  ╚═╝░░╚═╝╚═════╝░              //
//                                                                                        //
//                                                                                        //
////////////////////////////////////////////////////////////////////////////////////////////
import {Strings} from "openzeppelin-contracts/contracts/utils/Strings.sol";
import {Owned} from "solmate/auth/Owned.sol";
import {Base64} from "base64/base64.sol";
contract GnarsHD is Owned {
    /* ⌐◨—————————————————————————————————————————————————————————————◨
                         STRUCTS / EVENTS / ERRORS
       ⌐◨—————————————————————————————————————————————————————————————◨ */
    struct Artwork {
        string ipfsFolder;
        uint48 amountBackgrounds;
        uint48 amountBodies;
        uint48 amountAccessories;
        uint48 amountHeads;
        uint48 amountNoggles;
    }
    event Transfer(address indexed _from, address indexed _to, uint256 indexed _tokenId);
    error Untransferable();
    error TokenDoesNotExist(uint256 tokenId);
    /* ⌐◨—————————————————————————————————————————————————————————————◨
                         STORAGE
       ⌐◨—————————————————————————————————————————————————————————————◨ */
    string public name = "Gnars HD";
    string public symbol = "GNARSHD";
    string public rendererBaseUri;
    string public contractURI;
    Artwork public artwork;
    ISkateContractV2 public gnarsV2;
    /* ⌐◨—————————————————————————————————————————————————————————————◨
                        CONSTRUCTOR
       ⌐◨—————————————————————————————————————————————————————————————◨ */
    constructor(
        address _gnarsV2Address,
        string memory _rendererBaseUri,
        Artwork memory _artwork,
        string memory _contractURI,
        address _owner
    ) Owned(_owner) {
        gnarsV2 = ISkateContractV2(_gnarsV2Address);
        rendererBaseUri = _rendererBaseUri;
        artwork = _artwork;
        contractURI = _contractURI;
    }
    /* ⌐◨—————————————————————————————————————————————————————————————◨
                         MAIN LOGIC
       ⌐◨—————————————————————————————————————————————————————————————◨ */
    function setArtwork(Artwork memory _artwork) public onlyOwner {
        artwork = _artwork;
    }
    function setContractUri(string memory _contractURI) public onlyOwner {
        contractURI = _contractURI;
    }
    function setRendererBaseUri(string memory _rendererBaseUri) public onlyOwner {
        rendererBaseUri = _rendererBaseUri;
    }
    /// @notice The properties and query string for a generated token
    /// @param _tokenId The ERC-721 token id
    function getAttributes(uint256 _tokenId)
        public
        view
        returns (string memory resultAttributes, string memory queryString)
    {
        (uint48 background, uint48 body, uint48 accessory, uint48 head, uint48 glasses) = gnarsV2.seeds(_tokenId);
        IGnarDescriptorV2 descriptor = IGnarDescriptorV2(gnarsV2.descriptor());
        IGnarDecorator decorator = IGnarDecorator(descriptor.decorator());
        queryString = string.concat(
            "?contractAddress=",
            Strings.toHexString(address(this)),
            "&tokenId=",
            Strings.toString(_tokenId),
            getBackgroundQueryParam(background),
            getPartQueryParam("BODY", body, artwork.amountBodies),
            getPartQueryParam("ACCESSORY", accessory, artwork.amountAccessories),
            getPartQueryParam("HEADS", head, artwork.amountHeads),
            getPartQueryParam("NOGGLES", glasses, artwork.amountNoggles)
        );
        resultAttributes = string.concat(
            getPartTrait("Background", background, decorator.backgrounds),
            ",",
            getPartTrait("Body", body, decorator.bodies),
            ",",
            getPartTrait("Accessory", accessory, decorator.accessories),
            ",",
            getPartTrait("Head", head, decorator.heads),
            ",",
            getPartTrait("Glasses", glasses, decorator.glasses)
        );
    }
    function getPartQueryParam(string memory folder, uint48 partIndex, uint48 amountOfPart)
        public
        view
        returns (string memory)
    {
        if (partIndex >= amountOfPart) {
            return string.concat("&images=", artwork.ipfsFolder, "/", folder, "/FALLBACK.PNG");
        }
        return string.concat("&images=", artwork.ipfsFolder, "/", folder, "/", Strings.toString(partIndex), ".PNG");
    }
    function getBackgroundQueryParam(uint48 backgroundIndex) public view returns (string memory) {
        if (backgroundIndex >= artwork.amountBackgrounds) {
            return string.concat("&images=", artwork.ipfsFolder, "/BACKGROUND/FALLBACK.PNG");
        }
        return string.concat("&images=", artwork.ipfsFolder, "/BACKGROUND/", Strings.toString(backgroundIndex), ".PNG");
    }
    function getPartTrait(
        string memory traitType,
        uint48 partIndex,
        function (uint256) external view returns (string memory) getPartDescription
    ) public view returns (string memory) {
        try getPartDescription(partIndex) returns (string memory partDescription) {
            return string.concat('{"trait_type":"', traitType, '","value":"', partDescription, '"}');
        } catch {
            return string.concat('{"trait_type":"', traitType, '","value":"Unknown"}');
        }
    }
    function tokenURI(uint256 _tokenId) public view returns (string memory) {
        if (gnarsV2.ownerOf(_tokenId) == address(0)) {
            revert TokenDoesNotExist(_tokenId);
        }
        (string memory attributes, string memory queryString) = getAttributes(_tokenId);
        return string(
            abi.encodePacked(
                "data:application/json;base64,",
                Base64.encode(
                    bytes(
                        abi.encodePacked(
                            '{"name":"Gnar HD #',
                            Strings.toString(_tokenId),
                            '", "description":"High definition Gnar #',
                            Strings.toString(_tokenId),
                            " counterpart",
                            '", "attributes": [',
                            attributes,
                            '], "image": "',
                            string.concat(rendererBaseUri, queryString),
                            '"}'
                        )
                    )
                )
            )
        );
    }
    /* ⌐◨—————————————————————————————————————————————————————————————◨
                              PASSTHROUGH METHODS
       ⌐◨—————————————————————————————————————————————————————————————◨ */
    /// @notice Returns the total amount of Gnars HD in existence
    /// @dev Delegates to the Gnars V2 contract
    function totalSupply() external view returns (uint256) {
        return gnarsV2.totalSupply();
    }
    /// @notice Returns the tokenId of the Gnar HD by index
    /// @dev Delegates to the Gnars V2 contract
    function tokenByIndex(uint256 _index) external view returns (uint256) {
        return gnarsV2.tokenByIndex(_index);
    }
    /// @notice Returns the Gnar HD owner's address by token index
    /// @dev Delegates to the Gnars V2 contract
    function tokenOfOwnerByIndex(address _owner, uint256 _index) external view returns (uint256) {
        return gnarsV2.tokenOfOwnerByIndex(_owner, _index);
    }
    /// @notice Returns the Gnar HD owner's address by token id
    /// @dev Delegates to the Gnars V2 contract
    function ownerOf(uint256 id) public view returns (address owner) {
        return gnarsV2.ownerOf(id);
    }
    /// @notice Returns the amount of Gnars HD owned by the specified address
    /// @dev Delegates to the Gnars V2 contract
    function balanceOf(address owner) public view returns (uint256) {
        return gnarsV2.balanceOf(owner);
    }
    /// @notice Refresh ownership of specified tokens on marketplaces/datasets that are showing out of date information
    /// @dev Since this token is not mintable, there's no Transfer event. This method emits the Transfer event so that consumers that can detect the creation/new ownership of the token.
    /// @param tokenIds The ids of tokens to refresh
    function assertOwnership(uint256[] memory tokenIds) public {
        for (uint256 i = 0; i < tokenIds.length; i++) {
            uint256 tokenId = tokenIds[i];
            emit Transfer(address(0), gnarsV2.ownerOf(tokenId), tokenId);
        }
    }
    /* ⌐◨—————————————————————————————————————————————————————————————◨
                              ERC721 LOGIC
       ⌐◨—————————————————————————————————————————————————————————————◨ */
    /// @notice Gnars HD are not transferable
    /// @dev Will always revert
    function approve(address, uint256) public pure {
        revert Untransferable();
    }
    /// @notice Gnars HD are not transferable
    /// @dev Will always revert
    function setApprovalForAll(address, bool) public pure {
        revert Untransferable();
    }
    /// @notice Gnars HD are not transferable
    /// @dev Will always revert
    function transferFrom(address, address, uint256) public pure {
        revert Untransferable();
    }
    /// @notice Gnars HD are not transferable
    /// @dev Will always revert
    function safeTransferFrom(address, address, uint256) public pure {
        revert Untransferable();
    }
    /// @notice Gnars HD are not transferable
    /// @dev Will always revert
    function safeTransferFrom(address, address, uint256, bytes calldata) public pure {
        revert Untransferable();
    }
    /* ⌐◨—————————————————————————————————————————————————————————————◨
                              ERC6454 LOGIC
       ⌐◨—————————————————————————————————————————————————————————————◨ */
    /// @notice Gnars HD are not transferable
    /// @dev Will always return false
    function isTransferable(uint256, address, address) external pure returns (bool) {
        return false;
    }
    /* ⌐◨—————————————————————————————————————————————————————————————◨
                              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
            || interfaceId == 0x780e9d63 // ERC165 Interface ID for ERC721Enumerable
            || interfaceId == 0x7f5828d0 // ERC165 Interface ID for ERC173
            || interfaceId == 0x91a6262f; // ERC165 Interface ID for ERC6454
    }
}
interface IGnarDecorator {
    function accessories(uint256) external view returns (string memory);
    function backgrounds(uint256) external view returns (string memory);
    function bodies(uint256) external view returns (string memory);
    function glasses(uint256) external view returns (string memory);
    function heads(uint256) external view returns (string memory);
}
interface IGnarDescriptorV2 {
    function decorator() external view returns (address);
}
interface ISkateContractV2 {
    function balanceOf(address owner) external view returns (uint256);
    function descriptor() external view returns (address);
    function ownerOf(uint256 tokenId) external view returns (address);
    function seeds(uint256)
        external
        view
        returns (uint48 background, uint48 body, uint48 accessory, uint48 head, uint48 glasses);
    function tokenByIndex(uint256 index) external view returns (uint256);
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);
    function totalSupply() external view returns (uint256);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)
pragma solidity ^0.8.0;
import "./math/Math.sol";
import "./math/SignedMath.sol";
/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _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) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }
    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }
    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }
    /**
     * @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] = _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);
    }
    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity >=0.8.0;
/// @notice Simple single owner authorization mixin.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/auth/Owned.sol)
abstract contract Owned {
    /*//////////////////////////////////////////////////////////////
                                 EVENTS
    //////////////////////////////////////////////////////////////*/
    event OwnershipTransferred(address indexed user, address indexed newOwner);
    /*//////////////////////////////////////////////////////////////
                            OWNERSHIP STORAGE
    //////////////////////////////////////////////////////////////*/
    address public owner;
    modifier onlyOwner() virtual {
        require(msg.sender == owner, "UNAUTHORIZED");
        _;
    }
    /*//////////////////////////////////////////////////////////////
                               CONSTRUCTOR
    //////////////////////////////////////////////////////////////*/
    constructor(address _owner) {
        owner = _owner;
        emit OwnershipTransferred(address(0), _owner);
    }
    /*//////////////////////////////////////////////////////////////
                             OWNERSHIP LOGIC
    //////////////////////////////////////////////////////////////*/
    function transferOwnership(address newOwner) public virtual onlyOwner {
        owner = newOwner;
        emit OwnershipTransferred(msg.sender, newOwner);
    }
}
// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0;
/// @title Base64
/// @author Brecht Devos - <[email protected]>
/// @notice Provides functions for encoding/decoding base64
library Base64 {
    string internal constant TABLE_ENCODE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
    bytes  internal constant TABLE_DECODE = hex"0000000000000000000000000000000000000000000000000000000000000000"
                                            hex"00000000000000000000003e0000003f3435363738393a3b3c3d000000000000"
                                            hex"00000102030405060708090a0b0c0d0e0f101112131415161718190000000000"
                                            hex"001a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132330000000000";
    function encode(bytes memory data) internal pure returns (string memory) {
        if (data.length == 0) return '';
        // load the table into memory
        string memory table = TABLE_ENCODE;
        // multiply by 4/3 rounded up
        uint256 encodedLen = 4 * ((data.length + 2) / 3);
        // add some extra buffer at the end required for the writing
        string memory result = new string(encodedLen + 32);
        assembly {
            // set the actual output length
            mstore(result, encodedLen)
            // prepare the lookup table
            let tablePtr := add(table, 1)
            // input ptr
            let dataPtr := data
            let endPtr := add(dataPtr, mload(data))
            // result ptr, jump over length
            let resultPtr := add(result, 32)
            // run over the input, 3 bytes at a time
            for {} lt(dataPtr, endPtr) {}
            {
                // read 3 bytes
                dataPtr := add(dataPtr, 3)
                let input := mload(dataPtr)
                // write 4 characters
                mstore8(resultPtr, mload(add(tablePtr, and(shr(18, input), 0x3F))))
                resultPtr := add(resultPtr, 1)
                mstore8(resultPtr, mload(add(tablePtr, and(shr(12, input), 0x3F))))
                resultPtr := add(resultPtr, 1)
                mstore8(resultPtr, mload(add(tablePtr, and(shr( 6, input), 0x3F))))
                resultPtr := add(resultPtr, 1)
                mstore8(resultPtr, mload(add(tablePtr, and(        input,  0x3F))))
                resultPtr := add(resultPtr, 1)
            }
            // padding with '='
            switch mod(mload(data), 3)
            case 1 { mstore(sub(resultPtr, 2), shl(240, 0x3d3d)) }
            case 2 { mstore(sub(resultPtr, 1), shl(248, 0x3d)) }
        }
        return result;
    }
    function decode(string memory _data) internal pure returns (bytes memory) {
        bytes memory data = bytes(_data);
        if (data.length == 0) return new bytes(0);
        require(data.length % 4 == 0, "invalid base64 decoder input");
        // load the table into memory
        bytes memory table = TABLE_DECODE;
        // every 4 characters represent 3 bytes
        uint256 decodedLen = (data.length / 4) * 3;
        // add some extra buffer at the end required for the writing
        bytes memory result = new bytes(decodedLen + 32);
        assembly {
            // padding with '='
            let lastBytes := mload(add(data, mload(data)))
            if eq(and(lastBytes, 0xFF), 0x3d) {
                decodedLen := sub(decodedLen, 1)
                if eq(and(lastBytes, 0xFFFF), 0x3d3d) {
                    decodedLen := sub(decodedLen, 1)
                }
            }
            // set the actual output length
            mstore(result, decodedLen)
            // prepare the lookup table
            let tablePtr := add(table, 1)
            // input ptr
            let dataPtr := data
            let endPtr := add(dataPtr, mload(data))
            // result ptr, jump over length
            let resultPtr := add(result, 32)
            // run over the input, 4 characters at a time
            for {} lt(dataPtr, endPtr) {}
            {
               // read 4 characters
               dataPtr := add(dataPtr, 4)
               let input := mload(dataPtr)
               // write 3 bytes
               let output := add(
                   add(
                       shl(18, and(mload(add(tablePtr, and(shr(24, input), 0xFF))), 0xFF)),
                       shl(12, and(mload(add(tablePtr, and(shr(16, input), 0xFF))), 0xFF))),
                   add(
                       shl( 6, and(mload(add(tablePtr, and(shr( 8, input), 0xFF))), 0xFF)),
                               and(mload(add(tablePtr, and(        input , 0xFF))), 0xFF)
                    )
                )
                mstore(resultPtr, shl(232, output))
                resultPtr := add(resultPtr, 3)
            }
        }
        return result;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)
pragma solidity ^0.8.0;
/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }
    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }
    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }
    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }
    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }
            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }
            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");
            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////
            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)
                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }
            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.
            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)
                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)
                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }
            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;
            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;
            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256
            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }
    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }
    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);
        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }
    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }
    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }
    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }
    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }
    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }
    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }
    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)
pragma solidity ^0.8.0;
/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }
    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }
    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }
    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

// SPDX-License-Identifier: GPL-3.0
/// @title The Gnars ERC-721 token
// LICENSE
// SkateContractV2.sol is a modified version of Nounders DAO's NounsToken.sol:
// https://github.com/nounsDAO/nouns-monorepo/blob/master/packages/nouns-contracts/contracts/NounsToken.sol
//
// NounsToken.sol source code Copyright Nounders DAO licensed under the GPL-3.0 license.
// With modifications by Gnars.
pragma solidity 0.8.6;
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {ERC721} from "./base/ERC721.sol";
import {ERC721Checkpointable} from "./base/ERC721Checkpointable.sol";
import {ISkateContractV2} from "../interfaces/ISkateContractV2.sol";
import {IERC721} from "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import {IGnarSeederV2} from "../interfaces/IGNARSeederV2.sol";
import {IGnarDescriptorV2} from "../interfaces/IGNARDescriptorV2.sol";
import {IProxyRegistry} from "../interfaces/IProxyRegistry.sol";
import {Strings} from "@openzeppelin/contracts/utils/Strings.sol";
contract SkateContractV2 is ISkateContractV2, Ownable, ERC721Checkpointable {
    using Strings for uint256;
    // The nounders DAO address (creators org)
    address public noundersDAO;
    // An address who has permissions to mint Gnar
    address public minter;
    // The Gnar token URI descriptor
    IGnarDescriptorV2 public descriptor;
    // The Gnar token seeder
    IGnarSeederV2 public seeder;
    // Whether the minter can be updated
    bool public isMinterLocked;
    // Whether the descriptor can be updated
    bool public isDescriptorLocked;
    // Whether the seeder can be updated
    bool public isSeederLocked;
    // The Gnar seeds
    mapping(uint256 => IGnarSeederV2.Seed) public seeds;
    uint256 public initialGnarId;
    // The internal Gnar ID tracker
    uint256 private currentGnarId;
    // OpenSea's Proxy Registry
    IProxyRegistry public immutable proxyRegistry;
    // Store custom descriptions for Gnars
    mapping(uint256 => string) public customDescription;
    /**
     * @notice Require that the minter has not been locked.
     */
    modifier whenMinterNotLocked() {
        require(!isMinterLocked, "Minter is locked");
        _;
    }
    /**
     * @notice Require that the descriptor has not been locked.
     */
    modifier whenDescriptorNotLocked() {
        require(!isDescriptorLocked, "Descriptor is locked");
        _;
    }
    /**
     * @notice Require that the seeder has not been locked.
     */
    modifier whenSeederNotLocked() {
        require(!isSeederLocked, "Seeder is locked");
        _;
    }
    /**
     * @notice Require that the sender is the nounders DAO.
     */
    modifier onlyNoundersDAO() {
        require(msg.sender == noundersDAO, "Sender is not the nounders DAO");
        _;
    }
    /**
     * @notice Require that the sender is the minter.
     */
    modifier onlyMinter() {
        require(msg.sender == minter, "Sender is not the minter");
        _;
    }
    constructor(
        address _noundersDAO,
        address _minter,
        IGnarDescriptorV2 _descriptor,
        IGnarSeederV2 _seeder,
        IProxyRegistry _proxyRegistry,
        uint256 _initialGnarId
    ) ERC721("Gnars", "GNAR") {
        require(
            _noundersDAO != address(0) &&
                _minter != address(0) &&
                address(_descriptor) != address(0) &&
                address(_seeder) != address(0) &&
                address(_proxyRegistry) != address(0),
            "ZERO ADDRESS"
        );
        noundersDAO = _noundersDAO;
        minter = _minter;
        descriptor = _descriptor;
        seeder = _seeder;
        proxyRegistry = _proxyRegistry;
        initialGnarId = _initialGnarId;
        currentGnarId = _initialGnarId;
    }
    /**
     * @notice Override isApprovedForAll to whitelist user's OpenSea proxy accounts to enable gas-less listings.
     */
    function isApprovedForAll(address _owner, address operator) public view override(IERC721, ERC721) returns (bool) {
        // Whitelist OpenSea proxy contract for easy trading.
        if (proxyRegistry.proxies(_owner) == operator) {
            return true;
        }
        return super.isApprovedForAll(_owner, operator);
    }
    /**
     * @notice Mint a Gnar to the minter, along with a possible nounders reward
     * Noun. Nounders reward Gnars are minted every 10 Gnars, starting at 0.
     * @dev Call _mintTo with the to address(es).
     */
    function mint() public override onlyMinter returns (uint256) {
        if ((currentGnarId - initialGnarId) % 10 == 0) {
            _mintTo(noundersDAO, currentGnarId++);
        }
        return _mintTo(minter, currentGnarId++);
    }
    /**
     * @notice Burn a Gnar.
     */
    function burn(uint256 gnarId) public override onlyMinter {
        require(minter == ownerOf(gnarId), "Can burn its own token only");
        _burn(gnarId);
        emit GnarBurned(gnarId);
    }
    /**
     * @notice A distinct Uniform Resource Identifier (URI) for a given asset.
     * @dev See {IERC721Metadata-tokenURI}.
     */
    // function tokenURI(uint256 tokenId) public view override returns (string memory) {
    //     require(_exists(tokenId), "GnarToken: URI query for nonexistent token");
    //     return descriptor.tokenURI(tokenId, seeds[tokenId]);
    // }
    function tokenURI(uint256 tokenId) public view override returns (string memory) {
        require(_exists(tokenId), "GnarToken: URI query for nonexistent token");
        string memory gnarId = tokenId.toString();
        string memory name = string(abi.encodePacked("Gnar ", gnarId));
        string memory description = viewDescription(tokenId);
        return descriptor.genericDataURI(name, description, seeds[tokenId]);
    }
    /**
     * @notice Set the token minter.
     * @dev Only callable by the owner when not locked.
     */
    function setMinter(address _minter) external override onlyOwner whenMinterNotLocked {
        require(_minter != address(0), "ZERO ADDRESS");
        minter = _minter;
        emit MinterUpdated(_minter);
    }
    /**
     * @notice Lock the minter.
     * @dev This cannot be reversed and is only callable by the owner when not locked.
     */
    function lockMinter() external override onlyOwner whenMinterNotLocked {
        isMinterLocked = true;
        emit MinterLocked();
    }
    /**
     * @notice Set the token URI descriptor.
     * @dev Only callable by the owner when not locked.
     */
    function setDescriptor(IGnarDescriptorV2 _descriptor) external override onlyOwner whenDescriptorNotLocked {
        require(address(_descriptor) != address(0), "ZERO ADDRESS");
        descriptor = _descriptor;
        emit DescriptorUpdated(_descriptor);
    }
    /**
     * @notice Lock the descriptor.
     * @dev This cannot be reversed and is only callable by the owner when not locked.
     */
    function lockDescriptor() external override onlyOwner whenDescriptorNotLocked {
        isDescriptorLocked = true;
        emit DescriptorLocked();
    }
    /**
     * @notice Set the token seeder.
     * @dev Only callable by the owner when not locked.
     */
    function setSeeder(IGnarSeederV2 _seeder) external override onlyOwner whenSeederNotLocked {
        require(address(_seeder) != address(0), "ZERO ADDRESS");
        seeder = _seeder;
        emit SeederUpdated(_seeder);
    }
    /**
     * @notice Lock the seeder.
     * @dev This cannot be reversed and is only callable by the owner when not locked.
     */
    function lockSeeder() external override onlyOwner whenSeederNotLocked {
        isSeederLocked = true;
        emit SeederLocked();
    }
    /**
     * @notice Mint a Gnar with `gnarId` to the provided `to` address.
     */
    function _mintTo(address to, uint256 gnarId) internal returns (uint256) {
        IGnarSeederV2.Seed memory seed = seeds[gnarId] = seeder.generateSeed(gnarId, descriptor);
        _mint(owner(), to, gnarId);
        emit GnarCreated(gnarId, seed);
        return gnarId;
    }
    /**
     * @notice Set a custom description for a Gnar token on-chain that will display on OpenSea and other sites.
     * Takes the format of "Gnar [tokenId] is a [....]"
     * May be modified at any time
     * Send empty string to revert to default.
     * @dev Only callable by the holder of the token.
     */
    function setCustomDescription(uint256 tokenId, string calldata _description) external returns (string memory) {
        require(msg.sender == ownerOf(tokenId), "not your Gnar");
        customDescription[tokenId] = _description;
        string memory returnMessage = string(abi.encodePacked("Description set to: ", viewDescription(tokenId)));
        return returnMessage;
    }
    function viewDescription(uint256 tokenId) public view returns (string memory) {
        string memory description = "";
        string memory gnarId = tokenId.toString();
        if (bytes(customDescription[tokenId]).length != 0) {
            description = string(abi.encodePacked(description, "Gnar ", gnarId, " is a ", customDescription[tokenId]));
        } else {
            description = string(abi.encodePacked(description, "Gnar ", gnarId, " is a member of Gnars DAO"));
        }
        return description;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (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 Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }
    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }
    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }
    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
// SPDX-License-Identifier: MIT
/// @title ERC721 Token Implementation
/*********************************
 * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ *
 * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ *
 * ░░░░░░█████████░░█████████░░░ *
 * ░░░░░░██░░░████░░██░░░████░░░ *
 * ░░██████░░░████████░░░████░░░ *
 * ░░██░░██░░░████░░██░░░████░░░ *
 * ░░██░░██░░░████░░██░░░████░░░ *
 * ░░░░░░█████████░░█████████░░░ *
 * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ *
 * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ *
 *********************************/
// LICENSE
// ERC721.sol modifies OpenZeppelin's ERC721.sol:
// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/6618f9f18424ade44116d0221719f4c93be6a078/contracts/token/ERC721/ERC721.sol
//
// ERC721.sol source code copyright OpenZeppelin licensed under the MIT License.
// With modifications by Nounders DAO.
//
//
// MODIFICATIONS:
// `_safeMint` and `_mint` contain an additional `creator` argument and
// emit two `Transfer` logs, rather than one. The first log displays the
// transfer (mint) from `address(0)` to the `creator`. The second displays the
// transfer from the `creator` to the `to` address. This enables correct
// attribution on various NFT marketplaces.
pragma solidity ^0.8.6;
import '@openzeppelin/contracts/token/ERC721/IERC721.sol';
import '@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol';
import '@openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol';
import '@openzeppelin/contracts/utils/Address.sol';
import '@openzeppelin/contracts/utils/Context.sol';
import '@openzeppelin/contracts/utils/Strings.sol';
import '@openzeppelin/contracts/utils/introspection/ERC165.sol';
/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;
    // Token name
    string private _name;
    // Token symbol
    string private _symbol;
    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;
    // Mapping owner address to token count
    mapping(address => uint256) private _balances;
    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;
    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;
    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }
    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), 'ERC721: balance query for the zero address');
        return _balances[owner];
    }
    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), 'ERC721: owner query for nonexistent token');
        return owner;
    }
    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }
    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }
    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), 'ERC721Metadata: URI query for nonexistent token');
        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : '';
    }
    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return '';
    }
    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, 'ERC721: approval to current owner');
        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            'ERC721: approve caller is not owner nor approved for all'
        );
        _approve(to, tokenId);
    }
    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), 'ERC721: approved query for nonexistent token');
        return _tokenApprovals[tokenId];
    }
    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), 'ERC721: approve to caller');
        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }
    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }
    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), 'ERC721: transfer caller is not owner nor approved');
        _transfer(from, to, tokenId);
    }
    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, '');
    }
    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), 'ERC721: transfer caller is not owner nor approved');
        _safeTransfer(from, to, tokenId, _data);
    }
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), 'ERC721: transfer to non ERC721Receiver implementer');
    }
    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }
    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), 'ERC721: operator query for nonexistent token');
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }
    /**
     * @dev Safely mints `tokenId`, transfers it to `to`, and emits two log events -
     * 1. Credits the `minter` with the mint.
     * 2. Shows transfer from the `minter` to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(
        address creator,
        address to,
        uint256 tokenId
    ) internal virtual {
        _safeMint(creator, to, tokenId, '');
    }
    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address creator,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(creator, to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            'ERC721: transfer to non ERC721Receiver implementer'
        );
    }
    /**
     * @dev Mints `tokenId`, transfers it to `to`, and emits two log events -
     * 1. Credits the `creator` with the mint.
     * 2. Shows transfer from the `creator` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(
        address creator,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(to != address(0), 'ERC721: mint to the zero address');
        require(!_exists(tokenId), 'ERC721: token already minted');
        _beforeTokenTransfer(address(0), to, tokenId);
        _balances[to] += 1;
        _owners[tokenId] = to;
        emit Transfer(address(0), creator, tokenId);
        emit Transfer(creator, to, tokenId);
    }
    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);
        _beforeTokenTransfer(owner, address(0), tokenId);
        // Clear approvals
        _approve(address(0), tokenId);
        _balances[owner] -= 1;
        delete _owners[tokenId];
        emit Transfer(owner, address(0), tokenId);
    }
    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, 'ERC721: transfer of token that is not own');
        require(to != address(0), 'ERC721: transfer to the zero address');
        _beforeTokenTransfer(from, to, tokenId);
        // Clear approvals from the previous owner
        _approve(address(0), tokenId);
        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;
        emit Transfer(from, to, tokenId);
    }
    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }
    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver(to).onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert('ERC721: transfer to non ERC721Receiver implementer');
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }
    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}
// SPDX-License-Identifier: BSD-3-Clause
/// @title Vote checkpointing for an ERC-721 token
/*********************************
 * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ *
 * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ *
 * ░░░░░░█████████░░█████████░░░ *
 * ░░░░░░██░░░████░░██░░░████░░░ *
 * ░░██████░░░████████░░░████░░░ *
 * ░░██░░██░░░████░░██░░░████░░░ *
 * ░░██░░██░░░████░░██░░░████░░░ *
 * ░░░░░░█████████░░█████████░░░ *
 * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ *
 * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ *
 *********************************/
// LICENSE
// ERC721Checkpointable.sol uses and modifies part of Compound Lab's Comp.sol:
// https://github.com/compound-finance/compound-protocol/blob/ae4388e780a8d596d97619d9704a931a2752c2bc/contracts/Governance/Comp.sol
//
// Comp.sol source code Copyright 2020 Compound Labs, Inc. licensed under the BSD-3-Clause license.
// With modifications by Nounders DAO.
//
// Additional conditions of BSD-3-Clause can be found here: https://opensource.org/licenses/BSD-3-Clause
//
// MODIFICATIONS
// Checkpointing logic from Comp.sol has been used with the following modifications:
// - `delegates` is renamed to `_delegates` and is set to private
// - `delegates` is a public function that uses the `_delegates` mapping look-up, but unlike
//   Comp.sol, returns the delegator's own address if there is no delegate.
//   This avoids the delegator needing to "delegate to self" with an additional transaction
// - `_transferTokens()` is renamed `_beforeTokenTransfer()` and adapted to hook into OpenZeppelin's ERC721 hooks.
pragma solidity ^0.8.6;
import './ERC721Enumerable.sol';
abstract contract ERC721Checkpointable is ERC721Enumerable {
    /// @notice Defines decimals as per ERC-20 convention to make integrations with 3rd party governance platforms easier
    uint8 public constant decimals = 0;
    /// @notice A record of each accounts delegate
    mapping(address => address) private _delegates;
    /// @notice A checkpoint for marking number of votes from a given block
    struct Checkpoint {
        uint32 fromBlock;
        uint96 votes;
    }
    /// @notice A record of votes checkpoints for each account, by index
    mapping(address => mapping(uint32 => Checkpoint)) public checkpoints;
    /// @notice The number of checkpoints for each account
    mapping(address => uint32) public numCheckpoints;
    /// @notice The EIP-712 typehash for the contract's domain
    bytes32 public constant DOMAIN_TYPEHASH =
        keccak256('EIP712Domain(string name,uint256 chainId,address verifyingContract)');
    /// @notice The EIP-712 typehash for the delegation struct used by the contract
    bytes32 public constant DELEGATION_TYPEHASH =
        keccak256('Delegation(address delegatee,uint256 nonce,uint256 expiry)');
    /// @notice A record of states for signing / validating signatures
    mapping(address => uint256) public nonces;
    /// @notice An event thats emitted when an account changes its delegate
    event DelegateChanged(address indexed delegator, address indexed fromDelegate, address indexed toDelegate);
    /// @notice An event thats emitted when a delegate account's vote balance changes
    event DelegateVotesChanged(address indexed delegate, uint256 previousBalance, uint256 newBalance);
    /**
     * @notice The votes a delegator can delegate, which is the current balance of the delegator.
     * @dev Used when calling `_delegate()`
     */
    function votesToDelegate(address delegator) public view returns (uint96) {
        return safe96(balanceOf(delegator), 'ERC721Checkpointable::votesToDelegate: amount exceeds 96 bits');
    }
    /**
     * @notice Overrides the standard `Comp.sol` delegates mapping to return
     * the delegator's own address if they haven't delegated.
     * This avoids having to delegate to oneself.
     */
    function delegates(address delegator) public view returns (address) {
        address current = _delegates[delegator];
        return current == address(0) ? delegator : current;
    }
    /**
     * @notice Adapted from `_transferTokens()` in `Comp.sol` to update delegate votes.
     * @dev hooks into OpenZeppelin's `ERC721._transfer`
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal override {
        super._beforeTokenTransfer(from, to, tokenId);
        /// @notice Differs from `_transferTokens()` to use `delegates` override method to simulate auto-delegation
        _moveDelegates(delegates(from), delegates(to), 1);
    }
    /**
     * @notice Delegate votes from `msg.sender` to `delegatee`
     * @param delegatee The address to delegate votes to
     */
    function delegate(address delegatee) public {
        if (delegatee == address(0)) delegatee = msg.sender;
        return _delegate(msg.sender, delegatee);
    }
    /**
     * @notice Delegates votes from signatory to `delegatee`
     * @param delegatee The address to delegate votes to
     * @param nonce The contract state required to match the signature
     * @param expiry The time at which to expire the signature
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function delegateBySig(
        address delegatee,
        uint256 nonce,
        uint256 expiry,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public {
        bytes32 domainSeparator = keccak256(
            abi.encode(DOMAIN_TYPEHASH, keccak256(bytes(name())), getChainId(), address(this))
        );
        bytes32 structHash = keccak256(abi.encode(DELEGATION_TYPEHASH, delegatee, nonce, expiry));
        bytes32 digest = keccak256(abi.encodePacked('\\x19\\x01', domainSeparator, structHash));
        address signatory = ecrecover(digest, v, r, s);
        require(signatory != address(0), 'ERC721Checkpointable::delegateBySig: invalid signature');
        require(nonce == nonces[signatory]++, 'ERC721Checkpointable::delegateBySig: invalid nonce');
        require(block.timestamp <= expiry, 'ERC721Checkpointable::delegateBySig: signature expired');
        return _delegate(signatory, delegatee);
    }
    /**
     * @notice Gets the current votes balance for `account`
     * @param account The address to get votes balance
     * @return The number of current votes for `account`
     */
    function getCurrentVotes(address account) external view returns (uint96) {
        uint32 nCheckpoints = numCheckpoints[account];
        return nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
    }
    /**
     * @notice Determine the prior number of votes for an account as of a block number
     * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
     * @param account The address of the account to check
     * @param blockNumber The block number to get the vote balance at
     * @return The number of votes the account had as of the given block
     */
    function getPriorVotes(address account, uint256 blockNumber) public view returns (uint96) {
        require(blockNumber < block.number, 'ERC721Checkpointable::getPriorVotes: not yet determined');
        uint32 nCheckpoints = numCheckpoints[account];
        if (nCheckpoints == 0) {
            return 0;
        }
        // First check most recent balance
        if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
            return checkpoints[account][nCheckpoints - 1].votes;
        }
        // Next check implicit zero balance
        if (checkpoints[account][0].fromBlock > blockNumber) {
            return 0;
        }
        uint32 lower = 0;
        uint32 upper = nCheckpoints - 1;
        while (upper > lower) {
            uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            Checkpoint memory cp = checkpoints[account][center];
            if (cp.fromBlock == blockNumber) {
                return cp.votes;
            } else if (cp.fromBlock < blockNumber) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return checkpoints[account][lower].votes;
    }
    function _delegate(address delegator, address delegatee) internal {
        /// @notice differs from `_delegate()` in `Comp.sol` to use `delegates` override method to simulate auto-delegation
        address currentDelegate = delegates(delegator);
        _delegates[delegator] = delegatee;
        emit DelegateChanged(delegator, currentDelegate, delegatee);
        uint96 amount = votesToDelegate(delegator);
        _moveDelegates(currentDelegate, delegatee, amount);
    }
    function _moveDelegates(
        address srcRep,
        address dstRep,
        uint96 amount
    ) internal {
        if (srcRep != dstRep && amount > 0) {
            if (srcRep != address(0)) {
                uint32 srcRepNum = numCheckpoints[srcRep];
                uint96 srcRepOld = srcRepNum > 0 ? checkpoints[srcRep][srcRepNum - 1].votes : 0;
                uint96 srcRepNew = sub96(srcRepOld, amount, 'ERC721Checkpointable::_moveDelegates: amount underflows');
                _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
            }
            if (dstRep != address(0)) {
                uint32 dstRepNum = numCheckpoints[dstRep];
                uint96 dstRepOld = dstRepNum > 0 ? checkpoints[dstRep][dstRepNum - 1].votes : 0;
                uint96 dstRepNew = add96(dstRepOld, amount, 'ERC721Checkpointable::_moveDelegates: amount overflows');
                _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
            }
        }
    }
    function _writeCheckpoint(
        address delegatee,
        uint32 nCheckpoints,
        uint96 oldVotes,
        uint96 newVotes
    ) internal {
        uint32 blockNumber = safe32(
            block.number,
            'ERC721Checkpointable::_writeCheckpoint: block number exceeds 32 bits'
        );
        if (nCheckpoints > 0 && checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber) {
            checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
        } else {
            checkpoints[delegatee][nCheckpoints] = Checkpoint(blockNumber, newVotes);
            numCheckpoints[delegatee] = nCheckpoints + 1;
        }
        emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
    }
    function safe32(uint256 n, string memory errorMessage) internal pure returns (uint32) {
        require(n < 2**32, errorMessage);
        return uint32(n);
    }
    function safe96(uint256 n, string memory errorMessage) internal pure returns (uint96) {
        require(n < 2**96, errorMessage);
        return uint96(n);
    }
    function add96(
        uint96 a,
        uint96 b,
        string memory errorMessage
    ) internal pure returns (uint96) {
        uint96 c = a + b;
        require(c >= a, errorMessage);
        return c;
    }
    function sub96(
        uint96 a,
        uint96 b,
        string memory errorMessage
    ) internal pure returns (uint96) {
        require(b <= a, errorMessage);
        return a - b;
    }
    function getChainId() internal view returns (uint256) {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        return chainId;
    }
}
// SPDX-License-Identifier: GPL-3.0
/// @title Interface for Gnar
/*********************************
 * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ *
 * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ *
 * ░░░░░░█████████░░█████████░░░ *
 * ░░░░░░██░░░████░░██░░░████░░░ *
 * ░░██████░░░████████░░░████░░░ *
 * ░░██░░██░░░████░░██░░░████░░░ *
 * ░░██░░██░░░████░░██░░░████░░░ *
 * ░░░░░░█████████░░█████████░░░ *
 * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ *
 * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ *
 *********************************/
pragma solidity 0.8.6;
import {IERC721} from "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import {IGnarDescriptorV2} from "./IGNARDescriptorV2.sol";
import {IGnarSeederV2} from "./IGNARSeederV2.sol";
interface ISkateContractV2 is IERC721 {
    event GnarCreated(uint256 indexed tokenId, IGnarSeederV2.Seed seed);
    event GnarBurned(uint256 indexed tokenId);
    event MinterUpdated(address minter);
    event MinterLocked();
    event DescriptorUpdated(IGnarDescriptorV2 descriptor);
    event DescriptorLocked();
    event SeederUpdated(IGnarSeederV2 seeder);
    event SeederLocked();
    function mint() external returns (uint256);
    function burn(uint256 tokenId) external;
    function setMinter(address minter) external;
    function lockMinter() external;
    function setDescriptor(IGnarDescriptorV2 descriptor) external;
    function lockDescriptor() external;
    function setSeeder(IGnarSeederV2 seeder) external;
    function lockSeeder() external;
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165.sol";
/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);
    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;
    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;
    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);
    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;
    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}
// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.6;
import {IGnarDescriptorV2} from "./IGNARDescriptorV2.sol";
interface IGnarSeederV2 {
    struct Seed {
        uint48 background;
        uint48 body;
        uint48 accessory;
        uint48 head;
        uint48 glasses;
    }
    function generateSeed(uint256 gnarId, IGnarDescriptorV2 descriptor) external view returns (Seed memory);
}
// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.6;
import {IGnarSeederV2} from "./IGNARSeederV2.sol";
import {IGnarDecorator} from "../interfaces/IGnarDecorator.sol";
interface IGnarDescriptorV2 {
    event PartsLocked();
    event DataURIToggled(bool enabled);
    event BaseURIUpdated(string baseURI);
    event DecoratorUpdated(IGnarDecorator decorator);
    function setDecorator(IGnarDecorator _decorator) external;
    function arePartsLocked() external returns (bool);
    function isDataURIEnabled() external returns (bool);
    function baseURI() external returns (string memory);
    function palettes(uint8 paletteIndex, uint256 colorIndex) external view returns (string memory);
    function backgrounds(uint256 index) external view returns (string memory);
    function bodies(uint256 index) external view returns (bytes memory);
    function accessories(uint256 index) external view returns (bytes memory);
    function heads(uint256 index) external view returns (bytes memory);
    function glasses(uint256 index) external view returns (bytes memory);
    function backgroundCount() external view returns (uint256);
    function bodyCount() external view returns (uint256);
    function accessoryCount() external view returns (uint256);
    function headCount() external view returns (uint256);
    function glassesCount() external view returns (uint256);
    function addManyColorsToPalette(uint8 paletteIndex, string[] calldata newColors) external;
    function addManyBackgrounds(string[] calldata backgrounds) external;
    function addManyBodies(bytes[] calldata bodies) external;
    function addManyAccessories(bytes[] calldata accessories) external;
    function addManyHeads(bytes[] calldata heads) external;
    function addManyGlasses(bytes[] calldata glasses) external;
    function addColorToPalette(uint8 paletteIndex, string calldata color) external;
    function addBackground(string calldata background) external;
    function addBody(bytes calldata body) external;
    function addAccessory(bytes calldata accessory) external;
    function addHead(bytes calldata head) external;
    function addGlasses(bytes calldata glasses) external;
    function lockParts() external;
    function toggleDataURIEnabled() external;
    function setBaseURI(string calldata baseURI) external;
    function tokenURI(uint256 tokenId, IGnarSeederV2.Seed memory seed) external view returns (string memory);
    function dataURI(uint256 tokenId, IGnarSeederV2.Seed memory seed) external view returns (string memory);
    function genericDataURI(
        string calldata name,
        string calldata description,
        IGnarSeederV2.Seed memory seed
    ) external view returns (string memory);
    function generateSVGImage(IGnarSeederV2.Seed memory seed) external view returns (string memory);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.6;
interface IProxyRegistry {
    function proxies(address) external view returns (address);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Strings.sol)
pragma solidity ^0.8.0;
/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    /**
     * @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);
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
pragma solidity ^0.8.0;
/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)
pragma solidity ^0.8.0;
/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)
pragma solidity ^0.8.0;
import "../IERC721.sol";
/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);
    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);
    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Address.sol)
pragma solidity ^0.8.0;
/**
 * @dev Collection of functions related to the address type
 */
library 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
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev 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) {
        require(isContract(target), "Address: delegate call to non-contract");
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }
    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)
pragma solidity ^0.8.0;
import "./IERC165.sol";
/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}
// 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
/// @title ERC721 Enumerable Extension
/*********************************
 * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ *
 * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ *
 * ░░░░░░█████████░░█████████░░░ *
 * ░░░░░░██░░░████░░██░░░████░░░ *
 * ░░██████░░░████████░░░████░░░ *
 * ░░██░░██░░░████░░██░░░████░░░ *
 * ░░██░░██░░░████░░██░░░████░░░ *
 * ░░░░░░█████████░░█████████░░░ *
 * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ *
 * ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░ *
 *********************************/
// LICENSE
// ERC721.sol modifies OpenZeppelin's ERC721Enumerable.sol:
// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/6618f9f18424ade44116d0221719f4c93be6a078/contracts/token/ERC721/extensions/ERC721Enumerable.sol
//
// ERC721Enumerable.sol source code copyright OpenZeppelin licensed under the MIT License.
// With modifications by Nounders DAO.
//
// MODIFICATIONS:
// Consumes modified `ERC721` contract. See notes in `ERC721.sol`.
pragma solidity ^0.8.0;
import './ERC721.sol';
import '@openzeppelin/contracts/token/ERC721/extensions/IERC721Enumerable.sol';
/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;
    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;
    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;
    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }
    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), 'ERC721Enumerable: owner index out of bounds');
        return _ownedTokens[owner][index];
    }
    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }
    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Enumerable.totalSupply(), 'ERC721Enumerable: global index out of bounds');
        return _allTokens[index];
    }
    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);
        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }
    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }
    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }
    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).
        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];
        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }
        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }
    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).
        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];
        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];
        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Enumerable.sol)
pragma solidity ^0.8.0;
import "../IERC721.sol";
/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);
    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);
    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}
// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.6;
import {IGnarSeederV2} from "./IGNARSeederV2.sol";
interface IGnarDecorator {
    function backgrounds(uint256 index) external view returns (string memory);
    function bodies(uint256 index) external view returns (string memory);
    function accessories(uint256 index) external view returns (string memory);
    function heads(uint256 index) external view returns (string memory);
    function glasses(uint256 index) external view returns (string memory);
    function addManyBackgrounds(string[] calldata _backgrounds) external;
    function addManyBodies(string[] calldata _bodies) external;
    function addManyAccessories(string[] calldata _accessories) external;
    function addManyHeads(string[] calldata _heads) external;
    function addManyGlasses(string[] calldata _glasses) external;
}