// File: contracts/NFT/ElectricSheep.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.12;

import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
import { Strings } from "@openzeppelin/contracts/utils/Strings.sol";
import { ERC721Pausable } from "@openzeppelin/contracts/token/ERC721/extensions/ERC721Pausable.sol";
import { ERC721CrossChain, ERC721 } from "./ERC721/ERC721CrossChain.sol";
import { ERC721Queryable } from "./ERC721/ERC721Queryable.sol";
import { SalePhaseConfiguration } from "./lib/SalePhaseConfiguration.sol";
import { SignatureVerifier } from "./lib/SignatureVerifier.sol";
import { VRFIntegration } from "./lib/VRFIntegration.sol";
import { Withdrawable } from "./lib/Withdrawable.sol";
import { AwakeningAbility } from "./lib/AwakeningAbility.sol";

contract ElectricSheep is
    Ownable,
    ERC721Pausable,
    ERC721Queryable,
    ERC721CrossChain,
    SignatureVerifier,
    Withdrawable,
    SalePhaseConfiguration,
    VRFIntegration,
    AwakeningAbility
{
    error InsufficientPayment();
    error InsufficientContractBalance();
    error ExceedMaxMintQuantity();
    error ExceedMintQuota();
    error InvalidMintQuota();
    error CallerNotUser();
    error MintZeroQuantity();
    error SetRefundVaultToZeroAddress();
    error RefundNotEnabled();
    error RefundFailed();

    event ProvenanceUpdated(string provenance);
    event Refunded(address from, address to, uint256 tokenId);
    event RefundConfigUpdated(RefundConfig config);

    struct CurrentMintedAmount {
        uint64 builderMint;
        uint64 allowlist;
        uint64 publicSale;
        uint64 team;
    }

    struct RefundConfig {
        bool enabled;
        uint256 price;
        address vault;
    }

    uint256 public constant COLLECTION_SIZE = 10000;
    uint256 public constant TEAM_MINT_MAX = 200;
    CurrentMintedAmount public currentMintedAmount;
    uint256 public nextTokenId = 0;
    uint256 public tokenStartingOffset;
    string public tokenBaseURI;
    string public provenance;
    RefundConfig public refundConfig;
    mapping(address => uint256) public builderMintedPerAddress;
    mapping(address => uint256) public allowlistMintedPerAddress;
    mapping(address => uint256) public publicSaleMintedPerAddress;


    /**
     * @notice Constructor
     * @param name token name
     * @param symbol token symbol
     * @param coordinator chainlink VRF coordinator contract address
     * @param keyHash chainlink VRF key hash
     * @param subscriptionId chainlink VRF subscription id
     * 
     */
    constructor(
        string memory name,
        string memory symbol,
        address coordinator,
        bytes32 keyHash,
        uint64 subscriptionId
    )
        ERC721Queryable(COLLECTION_SIZE)
        ERC721CrossChain(name, symbol)
        SignatureVerifier(name, "1")
        VRFIntegration(coordinator, keyHash, subscriptionId)
    {}

    /**
     * @notice Caller is an externally owned account
     */
    modifier callerIsUser() {
        if (tx.origin != _msgSender()) {
            revert CallerNotUser();
        }
        _;
    }

    /**
     * @notice Check all sale phases' minting quantity
     * @param quantity mint quantity
     */
    modifier checkMintQuantityCommon(uint256 quantity) {
        if (quantity == 0) {
            revert MintZeroQuantity();
        }
        if (nextTokenId + quantity > COLLECTION_SIZE) {
            revert ExceedMaxMintQuantity();
        }
        _;
    }

    /**
     * @notice Mint for builder
     * @param quantity mint quantity
     * @param signature signature to verify minting
     */
    function builderMint(uint256 quantity, uint256 quota, bytes calldata signature)
        external
        payable
        callerIsUser
        whenBuilderMintActive
        checkMintQuantityCommon(quantity)
        verifyBuilderMint(quota, signature)
    {
        if (currentMintedAmount.builderMint + quantity > builderMintMaxAmount) {
            revert ExceedMaxMintQuantity();
        }
        address sender = _msgSender();
        if (quota == 0 || quota > builderMintMaxPerAddress) {
            revert InvalidMintQuota();
        }
        if (builderMintedPerAddress[sender] + quantity > quota) {
            revert ExceedMintQuota();
        }
        if (msg.value < quantity * builderMintPrice) {
            revert InsufficientPayment();
        }

        builderMintedPerAddress[sender] += quantity;
        currentMintedAmount.builderMint += uint64(quantity);
        for (uint256 i = 0; i < quantity; i++) {
            _safeMint(sender, nextTokenId++);
        }
    }

    /**
     * @notice Mint for allowlist
     * @param quantity mint quantity
     * @param quota mint quota for per address
     * @param signature signature to verify minting
     */
    function allowlistMint(uint256 quantity, uint256 quota, bytes calldata signature)
        external
        payable
        callerIsUser
        whenAllowlistActive
        checkMintQuantityCommon(quantity)
        verifyAllowlist(quota, signature)
    {
        if (currentMintedAmount.allowlist + quantity > allowlistMaxAmount) {
            revert ExceedMaxMintQuantity();
        }
        address sender = _msgSender();
        if (quota == 0 || quota > allowlistMaxMintPerAddress) {
            revert InvalidMintQuota();
        }
        if (allowlistMintedPerAddress[sender] + quantity > quota) {
            revert ExceedMintQuota();
        }
        if (msg.value < quantity * allowlistPrice) {
            revert InsufficientPayment();
        }

        allowlistMintedPerAddress[sender] += quantity;
        currentMintedAmount.allowlist += uint64(quantity);
        for (uint256 i = 0; i < quantity; i++) {
            _safeMint(sender, nextTokenId++);
        }
    }

    /**
     * @notice Mint for public sale
     * @param quantity mint quantity
     * @param signature signature to verify minting
     */
    function publicSaleMint(uint256 quantity, bytes calldata signature)
        external
        payable
        callerIsUser
        whenPublicSaleActive
        checkMintQuantityCommon(quantity)
        verifyPublicSale(quantity, signature)
    {
        if (currentMintedAmount.publicSale + quantity > publicSaleMaxAmount) {
            revert ExceedMaxMintQuantity();
        }
        address sender = _msgSender();
        if (publicSaleMintedPerAddress[sender] + quantity > publicSaleMaxMintPerAddress) {
            revert ExceedMintQuota();
        }
        if (msg.value < quantity * publicSalePrice) {
            revert InsufficientPayment();
        }

        publicSaleMintedPerAddress[sender] += quantity;
        currentMintedAmount.publicSale += uint64(quantity);
        for (uint256 i = 0; i < quantity; i++) {
            _safeMint(sender, nextTokenId++);
        }
    }

    /**
     * @notice Mint for publisher
     * @param to recevier address
     * @param quantity mint quantity
     */
    function teamMint(address to, uint256 quantity) external onlyOwner checkMintQuantityCommon(quantity) {
        if (currentMintedAmount.team + quantity > TEAM_MINT_MAX) {
            revert ExceedMaxMintQuantity();
        }

        currentMintedAmount.team += uint64(quantity);
        for (uint256 i = 0; i < quantity; i++) {
            _safeMint(to, nextTokenId++);
        }
    }

    /**
     * @notice Allow owners to refund their tokens, only available in ethereum chain
     * @param tokenId token to be refunded
     */
    function refund(uint256 tokenId) external callerIsUser nonReentrant {
        if (!isRefundEnabled()) {
            revert RefundNotEnabled();
        }
        if (address(this).balance < refundConfig.price) {
            revert InsufficientContractBalance();
        }
        address from = _msgSender();
        address to = refundConfig.vault;
        if (ownerOf(tokenId) != from) {
            revert CallerNotOwner();
        }
        safeTransferFrom(from, to, tokenId);
        emit Refunded(from, to, tokenId);
        (bool success, ) = from.call{value: refundConfig.price}("");
        if (!success) {
            revert RefundFailed();
        }
    }

    /**
     * @notice Set token base uri
     * @param uri uri
     */
    function setTokenBaseURI(string memory uri) external onlyOwner {
        tokenBaseURI = uri;
    }

    /**
     * @notice Change the provenance hash
     * Dealing with unforeseen circumstances, under community supervision
     * @param provenance_ provenance hash
     */
    function setProvenance(string memory provenance_) external onlyOwner {
        provenance = provenance_;
        emit ProvenanceUpdated(provenance);
    }

    /**
     * @notice Pause all token operations
     * Dealing with unforeseen circumstances, under community supervision
     */
    function emergencyPause() external onlyOwner {
        _pause();
    }

    /**
     * @notice Unpause contract
     */
    function unpause() external onlyOwner {
        _unpause();
    }

    /**
     * @notice Enable and configure refund process
     * @param config refund config
     */
    function setRefundConfig(RefundConfig calldata config) external onlyOwner {
        if (config.vault == address(0)) {
            revert SetRefundVaultToZeroAddress();
        }
        refundConfig = config;
        emit RefundConfigUpdated(config);
    }

    /**
     * @notice Indicate if the refund process is enabled
     */
    function isRefundEnabled() public view returns (bool) {
        return refundConfig.enabled && refundConfig.price > 0 && refundConfig.vault != address(0);
    }

    /**
     * @notice Assign tokenId to tokens in the provenance sequence, which is decied by random number
     * @param seed random number
     */
    function afterRandomSeedSettled(uint256 seed) internal override {
        // The first three tokens are special edition, their tokenIds are fixed in 0/1/2;
        uint256 fixedTokens = 3;
        // offset ranges from 1 to 9996, avoid using the default sequence
        tokenStartingOffset = (seed % (COLLECTION_SIZE - fixedTokens - 1)) + 1;
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal override(ERC721, ERC721Pausable, ERC721Queryable, AwakeningAbility) {
        super._beforeTokenTransfer(from, to, tokenId);
    }

    function _baseURI() internal view override returns (string memory) {
        return tokenBaseURI;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// 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);
    }
}

// File: @openzeppelin/contracts/utils/Strings.sol



// 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);
    }
}

// File: @openzeppelin/contracts/token/ERC721/extensions/ERC721Pausable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Pausable.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "../../../security/Pausable.sol";

/**
 * @dev ERC721 token with pausable token transfers, minting and burning.
 *
 * Useful for scenarios such as preventing trades until the end of an evaluation
 * period, or having an emergency switch for freezing all token transfers in the
 * event of a large bug.
 */
abstract contract ERC721Pausable is ERC721, Pausable {
    /**
     * @dev See {ERC721-_beforeTokenTransfer}.
     *
     * Requirements:
     *
     * - the contract must not be paused.
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

        require(!paused(), "ERC721Pausable: token transfer while paused");
    }
}

// File: contracts/NFT/ERC721/ERC721CrossChain.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.12;

import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
import { ERC721 } from "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import { INFTBridge } from "../../NFTBridge/interfaces/INFTBridge.sol";

contract ERC721CrossChain is Ownable, ERC721 {
    error CallerNotNFTBridge();
    error CrossChainBridgeNotEnabled();
    error CrossChainCallerNotOwner();
    error CrossChainToZeroAddress();

    event NFTBridgeUpdated(address);

    address public nftBridge;

    /**
     * @notice Constructor
     * @param name token name
     * @param symbol token symbol
     */
    constructor(string memory name, string memory symbol) ERC721(name, symbol) {}

    /**
     * @notice Only accept transcations sent by NFTBridge
     */
    modifier onlyNftBridge() {
        if (nftBridge == address(0)) {
            revert CrossChainBridgeNotEnabled();
        }
        if (_msgSender() != nftBridge) {
            revert CallerNotNFTBridge();
        }
        _;
    }

    /**
     * @notice Cross-chain ability is enabled
     */
    modifier crossChainEnabled() {
        if (nftBridge == address(0)) {
            revert CrossChainBridgeNotEnabled();
        }
        _;
    }

    /**
     * @notice Set NFTBridge contract address
     * @param bridge NFTBridge contract address
     */
    function setNFTBridge(address bridge) external onlyOwner {
        nftBridge = bridge;
        emit NFTBridgeUpdated(bridge);
    }

    /**
     * @notice Cross-chain transfer to specific receiver
     * @param chainId destination chain that token will be transferred to
     * @param tokenId token will be transferred
     * @param receiver wallet address in destination chain who will receive token
     */
    function crossChain(uint64 chainId, uint256 tokenId, address receiver) public payable crossChainEnabled {
        if (_msgSender() != ownerOf(tokenId)) {
            revert CrossChainCallerNotOwner();
        }
        if (receiver == address(0)) {
            revert CrossChainToZeroAddress();
        }

        string memory uri = tokenURI(tokenId);
        // burn token
        _burn(tokenId);
        // send transfer message to destination chain
        INFTBridge(nftBridge).sendMsg{value: msg.value}(
            chainId,
            _msgSender(),
            receiver,
            tokenId,
            uri
        );
    }

    /**
     * @notice Cross-chain transfer to specific receiver presented by bytes type, used for non-evm chains
     * @param chainId destination chain that token will be transferred to
     * @param tokenId token will be transferred
     * @param receiver wallet address in destination chain who will receive token
     */
    function crossChain(uint64 chainId, uint256 tokenId, bytes calldata receiver) public payable crossChainEnabled {
        if (_msgSender() != ownerOf(tokenId)) {
            revert CrossChainCallerNotOwner();
        }

        string memory uri = tokenURI(tokenId);
        // burn token
        _burn(tokenId);
        // send transfer message to destination chain
        INFTBridge(nftBridge).sendMsg{value: msg.value}(
            chainId,
            _msgSender(),
            receiver,
            tokenId,
            uri
        );
    }

    /**
     * @notice Estimate fees paid for cross-chain transfer
     * @dev The cBridge website depends on this function
     * @param chainId destination chain id
     * @param tokenId token id
     */
    function totalFee(uint64 chainId, uint256 tokenId) external view crossChainEnabled returns (uint256) {
        return INFTBridge(nftBridge).totalFee(chainId, address(this), tokenId);
    }

    /**
     * @notice Called by nftBridge contract to mint the transferred token from other chain
     * @param to token receiver
     * @param tokenId token id
     */
    function bridgeMint(address to, uint256 tokenId, string memory /* uri */) external onlyNftBridge {
        _safeMint(to, tokenId);
    }
}
// File: contracts/NFT/ERC721/ERC721Queryable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.12;

import { ERC721 } from "@openzeppelin/contracts/token/ERC721/ERC721.sol";

abstract contract ERC721Queryable is ERC721 {
    error OwnerIndexOutOfBounds();
    error OwnerIndexNotExist();

    uint256 public mintedAmount;
    uint256 private immutable collectionSize;

    /**
     * @notice Constructor
     * @param size the collection size
     */
    constructor(uint256 size) {
        collectionSize = size;
    }

    /**
     * @notice Returns the total amount of tokens stored by the contract
     */
    function totalSupply() public view returns (uint256) {
        return mintedAmount;
    }

    /**
     * @notice Returns a token ID owned by `owner` at a given `index` of its token list.
     * @dev This read function is O(totalSupply). If calling from a separate contract, be sure to test gas first.
     * It may also degrade with extremely large collection sizes (e.g >> 10000), test for your use case.
     * @param owner token owner
     * @param index index of its token list
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256) {
        if (index >= balanceOf(owner)) {
            revert OwnerIndexOutOfBounds();
        }
    
        uint256 currentIndex = 0;
        unchecked {
            for (uint256 tokenId = 0; tokenId < collectionSize; tokenId++) {
                if (_exists(tokenId) && owner == ownerOf(tokenId)) {
                    if (currentIndex == index) {
                        return tokenId;
                    }
                    currentIndex++;
                }
            }
        }

        // Execution should never reach this point.
        revert OwnerIndexNotExist();
    }

    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

        if (from == address(0)) {
            mintedAmount += 1;
        }
        if (to == address(0)) {
            mintedAmount -= 1;
        }
    }
}
// File: contracts/NFT/lib/SalePhaseConfiguration.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.12;

import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";

contract SalePhaseConfiguration is Ownable {
    error BuilderMintNotActive();
    error PublicSaleNotActive();
    error AllowlistNotActive();
    error SaleAlreadyStarted();

    event BuilderMintStarted(uint256 price, uint256 amount);
    event BuilderMintStopped();
    event AllowlistStarted(uint256 price, uint256 amount);
    event AllowlistStopped();
    event PublicSaleStarted(uint256 price, uint256 amount);
    event PublicSaleStopped();

    bool public builderMintActive;
    bool public allowlistActive;
    bool public publicSaleActive;

    uint256 public builderMintPrice;
    uint256 public builderMintMaxPerAddress;
    uint256 public builderMintMaxAmount;

    uint256 public allowlistPrice;
    uint256 public allowlistMaxMintPerAddress;
    uint256 public allowlistMaxAmount;

    uint256 public publicSalePrice;
    uint256 public publicSaleMaxMintPerAddress;
    uint256 public publicSaleMaxAmount;

    /**
     * @notice Allowlist mint is started
     */
    modifier whenAllowlistActive() {
        if (!allowlistActive) {
            revert AllowlistNotActive();
        }
        _;
    }

    /**
     * @notice Public sale mint is started
     */
    modifier whenPublicSaleActive() {
        if (!publicSaleActive) {
            revert PublicSaleNotActive();
        }
        _;
    }

    /**
     * @notice Builder mint is started
     */
    modifier whenBuilderMintActive() {
        if (!builderMintActive) {
            revert BuilderMintNotActive();
        }
        _;
    }

    /**
     * @notice Start builder mint
     * @param price mint price
     * @param maxMintPerAddress maximal amount for every address can mint
     * @param maxAmount maximal amount for whole public sale
     */
    function startBuilderMint(
        uint256 price,
        uint256 maxMintPerAddress,
        uint256 maxAmount
    ) external onlyOwner {
        if (builderMintActive) {
            revert SaleAlreadyStarted();
        }

        builderMintPrice = price;
        builderMintMaxPerAddress = maxMintPerAddress;
        builderMintMaxAmount = maxAmount;
        builderMintActive = true;

        emit BuilderMintStarted(price, maxAmount);
    }

    /**
     * @notice Stop builder mint
     */
    function stopBuilderMint() external onlyOwner {
        builderMintActive = false;
        emit BuilderMintStopped();
    }

    /**
     * @notice Start allowlist mint
     * @param price mint price
     * @param maxMintPerAddress maximal amount for every address can mint
     * @param maxAmount maximal amount for whole allowlist
     */
    function startAllowlist(
        uint256 price,
        uint256 maxMintPerAddress,
        uint256 maxAmount
    ) external onlyOwner {
        if (allowlistActive) {
            revert SaleAlreadyStarted();
        }

        allowlistPrice = price;
        allowlistMaxMintPerAddress = maxMintPerAddress;
        allowlistMaxAmount = maxAmount;
        allowlistActive = true;

        emit AllowlistStarted(price, maxAmount);
    }

    /**
     * @notice Stop allowlist mint
     */
    function stopAllowlist() external onlyOwner {
        allowlistActive = false;
        emit AllowlistStopped();
    }

    /**
     * @notice Start public sale mint
     * @param price mint price
     * @param maxMintPerAddress maximal amount for every address can mint
     * @param maxAmount maximal amount for whole public sale
     */
    function startPublicSale(
        uint256 price,
        uint256 maxMintPerAddress,
        uint256 maxAmount
    ) external onlyOwner {
        if (publicSaleActive) {
            revert SaleAlreadyStarted();
        }

        publicSalePrice = price;
        publicSaleMaxMintPerAddress = maxMintPerAddress;
        publicSaleMaxAmount = maxAmount;
        publicSaleActive = true;

        emit PublicSaleStarted(price, maxAmount);
    }

    /**
     * @notice Stop public sale mint
     */
    function stopPublicSale() external onlyOwner {
        publicSaleActive = false;
        emit PublicSaleStopped();
    }
}

// File: contracts/NFT/lib/SignatureVerifier.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.12;

import { ECDSA } from "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import { EIP712 } from "@openzeppelin/contracts/utils/cryptography/draft-EIP712.sol";
import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";

contract SignatureVerifier is Ownable, EIP712 {
    using ECDSA for bytes32;

    error InvalidSignature();
    error VerificationKeyNotSet();

    struct VerificationKey {
        address allowlist;
        address publicSale;
        address builderMint;
    }

    VerificationKey public verificationKey;
    bytes32 public constant ALLOWLIST_TYPEHASH = keccak256("Allowlist(address wallet,uint256 quota)");
    bytes32 public constant PUBLIC_SALE_TYPEHASH = keccak256("PubSale(address wallet,uint256 quantity)");
    bytes32 public constant BUILDER_MINT_TYPEHASH = keccak256("BuilderMint(address wallet,uint256 quota)");

    /**
     * @notice Constructor
     * @param name eip712 domain name
     * @param version eip712 domain version
     */
    constructor(string memory name, string memory version) EIP712(name, version) {}

    modifier verifyAllowlist(uint256 quota, bytes calldata signature) {
        if (verificationKey.allowlist == address(0)) {
            revert VerificationKeyNotSet();
        }
        if (getAllowlistRecoverAddress(quota, signature) != verificationKey.allowlist) {
            revert InvalidSignature();
        }
        _;
    }

    modifier verifyPublicSale(uint256 quantity, bytes calldata signature) {
        if (verificationKey.publicSale == address(0)) {
            revert VerificationKeyNotSet();
        }
        if (getPublicSaleRecoverAddress(quantity, signature) != verificationKey.publicSale) {
            revert InvalidSignature();
        }
        _;
    }

    modifier verifyBuilderMint(uint256 quota, bytes calldata signature) {
        if (verificationKey.builderMint == address(0)) {
            revert VerificationKeyNotSet();
        }
        if (getBuilderMintRecoverAddress(quota, signature) != verificationKey.builderMint) {
            revert InvalidSignature();
        }
        _;
    }

    /**
     * @notice Set signature verify address for every sale phases
     * @param keyForAllowlist allowlist signature address
     * @param keyForPublicSale publicSale signature address
     * @param keyForBuilderMint builderMint signature address
     */
    function setSignatureVerificationKey(
        address keyForAllowlist,
        address keyForPublicSale,
        address keyForBuilderMint
    ) external onlyOwner {
        verificationKey.allowlist = keyForAllowlist;
        verificationKey.publicSale = keyForPublicSale;
        verificationKey.builderMint = keyForBuilderMint;
    }

    function getAllowlistRecoverAddress(uint256 quota, bytes calldata signature) internal view returns (address) {
        bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(ALLOWLIST_TYPEHASH, _msgSender(), quota)));
        return ECDSA.recover(digest, signature);
    }

    function getPublicSaleRecoverAddress(uint256 quantity, bytes calldata signature) internal view returns (address) {
        bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(PUBLIC_SALE_TYPEHASH, _msgSender(), quantity)));
        return ECDSA.recover(digest, signature);
    }

    function getBuilderMintRecoverAddress(uint256 quantity, bytes calldata signature) internal view returns (address) {
        bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(BUILDER_MINT_TYPEHASH, _msgSender(), quantity)));
        return ECDSA.recover(digest, signature);
    }
}

// File: contracts/NFT/lib/VRFIntegration.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.12;

import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
import { VRFConsumerBaseV2 } from "@chainlink/contracts/src/v0.8/VRFConsumerBaseV2.sol";
import { VRFCoordinatorV2Interface } from "@chainlink/contracts/src/v0.8/interfaces/VRFCoordinatorV2Interface.sol";

contract VRFIntegration is Ownable, VRFConsumerBaseV2 {
    error RandomSeedAlreadySettled();

    event RandomSeedSettled(uint256 requestId, uint256 seed);
    event RandomSeedManuallySettled(uint256 seed);

    VRFCoordinatorV2Interface public immutable vrfCoordinator;
    uint64 public immutable vrfSubscriptionId;
    bytes32 public immutable vrfKeyHash;
    uint32 public vrfCallbackGasLimit = 200000;
    bool public randomSeedSettled = false;
    uint256 public randomSeed;

    /**
     * @notice Constructor
     * @param coordinator chainlink VRF coordinator contract address
     * @param keyHash chainlink VRF key hash
     * @param subscriptionId chainlink VRF subscription id
     */
    constructor(
        address coordinator,
        bytes32 keyHash,
        uint64 subscriptionId
    ) VRFConsumerBaseV2(coordinator) {
        vrfCoordinator = VRFCoordinatorV2Interface(coordinator);
        vrfSubscriptionId = subscriptionId;
        vrfKeyHash = keyHash;
    }

    /**a
     * @notice Implemention of VRFConsumerBaseV2, only be called by vrf coordinator
     * @param requestId vrf request id
     * @param randomWords result from vrf
     */
    function fulfillRandomWords(
        uint256 requestId,
        uint256[] memory randomWords
    ) internal override {
        if (!randomSeedSettled) {
            randomSeedSettled = true;
            uint256 seed = randomWords[0];
            randomSeed = seed;
            emit RandomSeedSettled(requestId, seed);
            afterRandomSeedSettled(seed);
        }
    }

    /**
     * @notice Make a request to chainlink VRF to generate a random word
     */
    function requestRandomWords() external onlyOwner {
        if (randomSeedSettled) {
            revert RandomSeedAlreadySettled();
        }
        uint16 requestConfirmations = 3;
        uint16 numWords = 1;
        vrfCoordinator.requestRandomWords(
            vrfKeyHash,
            vrfSubscriptionId,
            requestConfirmations,
            vrfCallbackGasLimit,
            numWords
        );
    }

    /**
     * @notice Allow issuer to set random seed manually
     * Dealing with unforeseen circumstances, under community supervision
     * @param seed random number
     */
    function emergencySetRandomSeed(uint256 seed) external onlyOwner {
        randomSeedSettled = true;
        randomSeed = seed;
        emit RandomSeedManuallySettled(seed);
        afterRandomSeedSettled(seed);
    }

    /**
     * @notice Set VRF callback gas limit in case the default is insufficient
     * @param gasLimit gas limit
     */
    function setVRFCallbackGasLimit(uint32 gasLimit) external onlyOwner {
        vrfCallbackGasLimit = gasLimit;
    }

    function afterRandomSeedSettled(uint256 seed) internal virtual {}
}
// File: contracts/NFT/lib/Withdrawable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.12;

import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
import { ReentrancyGuard } from "@openzeppelin/contracts/security/ReentrancyGuard.sol";

contract Withdrawable is Ownable, ReentrancyGuard {
    error WithdrawFailed();

    event Withdraw(address account, uint256 amount);

    function withdrawAll() external onlyOwner nonReentrant {
        uint256 balance = address(this).balance;
        emit Withdraw(_msgSender(), balance);
        (bool success, ) = _msgSender().call{value: balance}("");
        if (!success) {
            revert WithdrawFailed();
        }
    }
}

// File: contracts/NFT/lib/AwakeningAbility.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.12;

import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
import { ERC721 } from "@openzeppelin/contracts/token/ERC721/ERC721.sol";

abstract contract AwakeningAbility is Ownable, ERC721 {
    error TokenAwakening();
    error AwakeningLocked();
    error CallerNotOwner();
    error CallerNotOwnerNorApproved();

    event AwakeningLockUpdated(bool unlocked);
    event AwakeningStarted(uint256 indexed tokenId, address indexed owner);
    event AwakeningStopped(uint256 indexed tokenId, address indexed owner);
    event AwakeningInterrupted(uint256 indexed tokenId, address indexed owner);
    event AwakeningTransfer(address indexed from, address indexed to, uint256 indexed tokenId);

    bool public isAwakeningUnlocked;
    bool private isAwakeningTransferAllowed;
    mapping(uint256 => bool) public awakeningState;

    /**
     * @notice Unlock the awakening abilitiy
     * @param unlocked unlock flag
     */
    function unlockAwakening(bool unlocked) external onlyOwner {
        isAwakeningUnlocked = unlocked;
        emit AwakeningLockUpdated(unlocked);
    }

    /**
     * @notice Interrupt the awakening state of token which was deliberately placed at a low price on marketplace but can't be traded
     * @param tokenIds list of tokenId
     */
    function interruptAwakening(uint256[] calldata tokenIds) external onlyOwner {
        uint256 size = tokenIds.length;
        for (uint256 i = 0; i < size; i++) {
            uint256 tokenId = tokenIds[i];
            if (awakeningState[tokenId]) {
                awakeningState[tokenId] = false;
                address owner = ownerOf(tokenId);
                emit AwakeningStopped(tokenId, owner);
                emit AwakeningInterrupted(tokenId, owner);
            }
        }
    }

    /**
     * @notice Set tokens' awakening state
     * @param tokenIds list of tokenId
     */
    function setAwakeningState(uint256[] calldata tokenIds, bool state) external {
        uint256 size = tokenIds.length;
        for (uint256 i = 0; i < size; i++) {
            uint256 tokenId = tokenIds[i];
            if (!_isApprovedOrOwner(_msgSender(), tokenId)) {
                revert CallerNotOwnerNorApproved();
            }
            bool currentState = awakeningState[tokenId];
            if (currentState && !state) {
                awakeningState[tokenId] = false;
                emit AwakeningStopped(tokenId, ownerOf(tokenId));
            } else if (!currentState && state) {
                if (!isAwakeningUnlocked) {
                    revert AwakeningLocked();
                }
                awakeningState[tokenId] = true;
                emit AwakeningStarted(tokenId, ownerOf(tokenId));
            }
        }
    }

    /**
     * @notice Transfer token while it is awakening
     * @param from transfer from address
     * @param to transfer to address
     * @param tokenId token must be owned by `from`
     */
    function safeTransferWhileAwakening(address from, address to, uint256 tokenId) public {
        if (ownerOf(tokenId) != _msgSender()) {
            revert CallerNotOwner();
        }
        isAwakeningTransferAllowed = true;
        safeTransferFrom(from, to, tokenId);
        isAwakeningTransferAllowed = false;
        if (awakeningState[tokenId]) {
            emit AwakeningTransfer(from, to, tokenId);
        }
    }

    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual override {
        if (awakeningState[tokenId] && !isAwakeningTransferAllowed) {
            revert TokenAwakening();
        }
        super._beforeTokenTransfer(from, to, tokenId);
    }
}
// File: @openzeppelin/contracts/utils/Context.sol



// 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;
    }
}

// File: @openzeppelin/contracts/token/ERC721/ERC721.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../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 overridden 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 {
        _setApprovalForAll(_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 || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
    }

    /**
     * @dev Safely mints `tokenId` and transfers it 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 to, uint256 tokenId) internal virtual {
        _safeMint(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 to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it 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 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), to, tokenId);

        _afterTokenTransfer(address(0), 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);

        _afterTokenTransfer(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 from incorrect owner");
        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);

        _afterTokenTransfer(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 Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @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.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 {}

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

// File: @openzeppelin/contracts/security/Pausable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must 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 Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

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

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

// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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 `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// File: @openzeppelin/contracts/token/ERC721/extensions/IERC721Metadata.sol



// 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);
}

// File: @openzeppelin/contracts/utils/Address.sol



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

pragma solidity ^0.8.1;

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

        return account.code.length > 0;
    }

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

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

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

// File: @openzeppelin/contracts/utils/introspection/ERC165.sol



// 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;
    }
}

// File: @openzeppelin/contracts/utils/introspection/IERC165.sol



// 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);
}

// File: contracts/NFTBridge/interfaces/INFTBridge.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.12;

interface INFTBridge {
    function sendMsg(
        uint64 chainId,
        address sender,
        address receiver,
        uint256 tokenId,
        string calldata uri
    ) external payable;

    function sendMsg(
        uint64 chainId,
        address sender,
        bytes calldata receiver,
        uint256 tokenId,
        string calldata uri
    ) external payable;

    function totalFee(
        uint64 chainId,
        address nft,
        uint256 tokenId
    ) external view returns (uint256);
}
// File: @openzeppelin/contracts/utils/cryptography/ECDSA.sol



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

pragma solidity ^0.8.0;

import "../Strings.sol";

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

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

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

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

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

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

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

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

        return (signer, RecoverError.NoError);
    }

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

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

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

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

// File: @openzeppelin/contracts/utils/cryptography/draft-EIP712.sol



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

pragma solidity ^0.8.0;

import "./ECDSA.sol";

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

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

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

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

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

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

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

// File: @chainlink/contracts/src/v0.8/VRFConsumerBaseV2.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

/** ****************************************************************************
 * @notice Interface for contracts using VRF randomness
 * *****************************************************************************
 * @dev PURPOSE
 *
 * @dev Reggie the Random Oracle (not his real job) wants to provide randomness
 * @dev to Vera the verifier in such a way that Vera can be sure he's not
 * @dev making his output up to suit himself. Reggie provides Vera a public key
 * @dev to which he knows the secret key. Each time Vera provides a seed to
 * @dev Reggie, he gives back a value which is computed completely
 * @dev deterministically from the seed and the secret key.
 *
 * @dev Reggie provides a proof by which Vera can verify that the output was
 * @dev correctly computed once Reggie tells it to her, but without that proof,
 * @dev the output is indistinguishable to her from a uniform random sample
 * @dev from the output space.
 *
 * @dev The purpose of this contract is to make it easy for unrelated contracts
 * @dev to talk to Vera the verifier about the work Reggie is doing, to provide
 * @dev simple access to a verifiable source of randomness. It ensures 2 things:
 * @dev 1. The fulfillment came from the VRFCoordinator
 * @dev 2. The consumer contract implements fulfillRandomWords.
 * *****************************************************************************
 * @dev USAGE
 *
 * @dev Calling contracts must inherit from VRFConsumerBase, and can
 * @dev initialize VRFConsumerBase's attributes in their constructor as
 * @dev shown:
 *
 * @dev   contract VRFConsumer {
 * @dev     constructor(<other arguments>, address _vrfCoordinator, address _link)
 * @dev       VRFConsumerBase(_vrfCoordinator) public {
 * @dev         <initialization with other arguments goes here>
 * @dev       }
 * @dev   }
 *
 * @dev The oracle will have given you an ID for the VRF keypair they have
 * @dev committed to (let's call it keyHash). Create subscription, fund it
 * @dev and your consumer contract as a consumer of it (see VRFCoordinatorInterface
 * @dev subscription management functions).
 * @dev Call requestRandomWords(keyHash, subId, minimumRequestConfirmations,
 * @dev callbackGasLimit, numWords),
 * @dev see (VRFCoordinatorInterface for a description of the arguments).
 *
 * @dev Once the VRFCoordinator has received and validated the oracle's response
 * @dev to your request, it will call your contract's fulfillRandomWords method.
 *
 * @dev The randomness argument to fulfillRandomWords is a set of random words
 * @dev generated from your requestId and the blockHash of the request.
 *
 * @dev If your contract could have concurrent requests open, you can use the
 * @dev requestId returned from requestRandomWords to track which response is associated
 * @dev with which randomness request.
 * @dev See "SECURITY CONSIDERATIONS" for principles to keep in mind,
 * @dev if your contract could have multiple requests in flight simultaneously.
 *
 * @dev Colliding `requestId`s are cryptographically impossible as long as seeds
 * @dev differ.
 *
 * *****************************************************************************
 * @dev SECURITY CONSIDERATIONS
 *
 * @dev A method with the ability to call your fulfillRandomness method directly
 * @dev could spoof a VRF response with any random value, so it's critical that
 * @dev it cannot be directly called by anything other than this base contract
 * @dev (specifically, by the VRFConsumerBase.rawFulfillRandomness method).
 *
 * @dev For your users to trust that your contract's random behavior is free
 * @dev from malicious interference, it's best if you can write it so that all
 * @dev behaviors implied by a VRF response are executed *during* your
 * @dev fulfillRandomness method. If your contract must store the response (or
 * @dev anything derived from it) and use it later, you must ensure that any
 * @dev user-significant behavior which depends on that stored value cannot be
 * @dev manipulated by a subsequent VRF request.
 *
 * @dev Similarly, both miners and the VRF oracle itself have some influence
 * @dev over the order in which VRF responses appear on the blockchain, so if
 * @dev your contract could have multiple VRF requests in flight simultaneously,
 * @dev you must ensure that the order in which the VRF responses arrive cannot
 * @dev be used to manipulate your contract's user-significant behavior.
 *
 * @dev Since the block hash of the block which contains the requestRandomness
 * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful
 * @dev miner could, in principle, fork the blockchain to evict the block
 * @dev containing the request, forcing the request to be included in a
 * @dev different block with a different hash, and therefore a different input
 * @dev to the VRF. However, such an attack would incur a substantial economic
 * @dev cost. This cost scales with the number of blocks the VRF oracle waits
 * @dev until it calls responds to a request. It is for this reason that
 * @dev that you can signal to an oracle you'd like them to wait longer before
 * @dev responding to the request (however this is not enforced in the contract
 * @dev and so remains effective only in the case of unmodified oracle software).
 */
abstract contract VRFConsumerBaseV2 {
  error OnlyCoordinatorCanFulfill(address have, address want);
  address private immutable vrfCoordinator;

  /**
   * @param _vrfCoordinator address of VRFCoordinator contract
   */
  constructor(address _vrfCoordinator) {
    vrfCoordinator = _vrfCoordinator;
  }

  /**
   * @notice fulfillRandomness handles the VRF response. Your contract must
   * @notice implement it. See "SECURITY CONSIDERATIONS" above for important
   * @notice principles to keep in mind when implementing your fulfillRandomness
   * @notice method.
   *
   * @dev VRFConsumerBaseV2 expects its subcontracts to have a method with this
   * @dev signature, and will call it once it has verified the proof
   * @dev associated with the randomness. (It is triggered via a call to
   * @dev rawFulfillRandomness, below.)
   *
   * @param requestId The Id initially returned by requestRandomness
   * @param randomWords the VRF output expanded to the requested number of words
   */
  function fulfillRandomWords(uint256 requestId, uint256[] memory randomWords) internal virtual;

  // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF
  // proof. rawFulfillRandomness then calls fulfillRandomness, after validating
  // the origin of the call
  function rawFulfillRandomWords(uint256 requestId, uint256[] memory randomWords) external {
    if (msg.sender != vrfCoordinator) {
      revert OnlyCoordinatorCanFulfill(msg.sender, vrfCoordinator);
    }
    fulfillRandomWords(requestId, randomWords);
  }
}

// File: @chainlink/contracts/src/v0.8/interfaces/VRFCoordinatorV2Interface.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface VRFCoordinatorV2Interface {
  /**
   * @notice Get configuration relevant for making requests
   * @return minimumRequestConfirmations global min for request confirmations
   * @return maxGasLimit global max for request gas limit
   * @return s_provingKeyHashes list of registered key hashes
   */
  function getRequestConfig()
    external
    view
    returns (
      uint16,
      uint32,
      bytes32[] memory
    );

  /**
   * @notice Request a set of random words.
   * @param keyHash - Corresponds to a particular oracle job which uses
   * that key for generating the VRF proof. Different keyHash's have different gas price
   * ceilings, so you can select a specific one to bound your maximum per request cost.
   * @param subId  - The ID of the VRF subscription. Must be funded
   * with the minimum subscription balance required for the selected keyHash.
   * @param minimumRequestConfirmations - How many blocks you'd like the
   * oracle to wait before responding to the request. See SECURITY CONSIDERATIONS
   * for why you may want to request more. The acceptable range is
   * [minimumRequestBlockConfirmations, 200].
   * @param callbackGasLimit - How much gas you'd like to receive in your
   * fulfillRandomWords callback. Note that gasleft() inside fulfillRandomWords
   * may be slightly less than this amount because of gas used calling the function
   * (argument decoding etc.), so you may need to request slightly more than you expect
   * to have inside fulfillRandomWords. The acceptable range is
   * [0, maxGasLimit]
   * @param numWords - The number of uint256 random values you'd like to receive
   * in your fulfillRandomWords callback. Note these numbers are expanded in a
   * secure way by the VRFCoordinator from a single random value supplied by the oracle.
   * @return requestId - A unique identifier of the request. Can be used to match
   * a request to a response in fulfillRandomWords.
   */
  function requestRandomWords(
    bytes32 keyHash,
    uint64 subId,
    uint16 minimumRequestConfirmations,
    uint32 callbackGasLimit,
    uint32 numWords
  ) external returns (uint256 requestId);

  /**
   * @notice Create a VRF subscription.
   * @return subId - A unique subscription id.
   * @dev You can manage the consumer set dynamically with addConsumer/removeConsumer.
   * @dev Note to fund the subscription, use transferAndCall. For example
   * @dev  LINKTOKEN.transferAndCall(
   * @dev    address(COORDINATOR),
   * @dev    amount,
   * @dev    abi.encode(subId));
   */
  function createSubscription() external returns (uint64 subId);

  /**
   * @notice Get a VRF subscription.
   * @param subId - ID of the subscription
   * @return balance - LINK balance of the subscription in juels.
   * @return reqCount - number of requests for this subscription, determines fee tier.
   * @return owner - owner of the subscription.
   * @return consumers - list of consumer address which are able to use this subscription.
   */
  function getSubscription(uint64 subId)
    external
    view
    returns (
      uint96 balance,
      uint64 reqCount,
      address owner,
      address[] memory consumers
    );

  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @param newOwner - proposed new owner of the subscription
   */
  function requestSubscriptionOwnerTransfer(uint64 subId, address newOwner) external;

  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @dev will revert if original owner of subId has
   * not requested that msg.sender become the new owner.
   */
  function acceptSubscriptionOwnerTransfer(uint64 subId) external;

  /**
   * @notice Add a consumer to a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - New consumer which can use the subscription
   */
  function addConsumer(uint64 subId, address consumer) external;

  /**
   * @notice Remove a consumer from a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - Consumer to remove from the subscription
   */
  function removeConsumer(uint64 subId, address consumer) external;

  /**
   * @notice Cancel a subscription
   * @param subId - ID of the subscription
   * @param to - Where to send the remaining LINK to
   */
  function cancelSubscription(uint64 subId, address to) external;
}

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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