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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

/*
	/$$$$$$$$ /$$ /$$                                         /$$                      /$$$$$$    /$$     /$$                                  
	| $$_____/| $$|__/                                        |__/                     /$$__  $$  | $$    | $$                                  
	| $$      | $$ /$$  /$$$$$$   /$$$$$$   /$$$$$$  /$$$$$$$  /$$ /$$$$$$$   /$$$$$$ | $$  \ $$ /$$$$$$ /$$$$$$    /$$$$$$   /$$$$$$   /$$$$$$$
	| $$$$$   | $$| $$ /$$__  $$ /$$__  $$ /$$__  $$| $$__  $$| $$| $$__  $$ /$$__  $$| $$  | $$|_  $$_/|_  $$_/   /$$__  $$ /$$__  $$ /$$_____/
	| $$__/   | $$| $$| $$  \ $$| $$  \ $$| $$$$$$$$| $$  \ $$| $$| $$  \ $$| $$  \ $$| $$  | $$  | $$    | $$    | $$$$$$$$| $$  \__/|  $$$$$$ 
	| $$      | $$| $$| $$  | $$| $$  | $$| $$_____/| $$  | $$| $$| $$  | $$| $$  | $$| $$  | $$  | $$ /$$| $$ /$$| $$_____/| $$       \____  $$
	| $$      | $$| $$| $$$$$$$/| $$$$$$$/|  $$$$$$$| $$  | $$| $$| $$  | $$|  $$$$$$$|  $$$$$$/  |  $$$$/|  $$$$/|  $$$$$$$| $$       /$$$$$$$/
	|__/      |__/|__/| $$____/ | $$____/  \_______/|__/  |__/|__/|__/  |__/ \____  $$ \______/    \___/   \___/   \_______/|__/      |_______/ 
					| $$      | $$                                         /$$  \ $$                                                          
					| $$      | $$                                        |  $$$$$$/                                                          
					|__/      |__/                                         \______/                                                           
*/
                                          
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Strings.sol";

import "@chainlink/contracts/src/v0.8/interfaces/KeeperCompatibleInterface.sol";
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import "@chainlink/contracts/src/v0.8/VRFConsumerBase.sol";

/**
 * Contract Timeline:
 * 1. Deploy the contract with right constructor params
 * 2. Send Link tokens to contract address
 * 3. Call getRandomNumber
 * 4. Set BaseURI, contractURI, lockMetadata
 * 5. Add presale address presale allocation
 * 6. Enable presale
 * 7. Add presale address giveaway allocation
 * 9. Enable sale
 * 10. Enable give away at 25% minting
 * 11. Enable companionUpdates at 50% minting
 * 12. Enable wingUpdates at 75% minting
 */ 
contract FlippeningOtters is ERC721, Ownable, KeeperCompatibleInterface, VRFConsumerBase {
    uint256 public constant OTTER_AIR_DROP_MAX = 300;
    uint256 public constant OTTER_GIVE_AWAY_MAX = 500;
    uint256 public constant OTTER_PRESALE_MAX = 300;
    uint256 public constant OTTER_MAX = 9999;
    uint256 public constant FLIPPENING_OTTER_TOKEN_ID = OTTER_MAX + 1;
    uint256 public constant OTTER_WING_PRICE = 0.02 ether;
    uint256 public constant OTTER_COMPANION_PRICE = 0.02 ether;
    uint256 public constant OTTER_PRESALE_PRICE = 0.01 ether;
    uint256 public OTTER_MINT_PRICE = 0.05 ether;
    address public gnosis_safe = 0xB836140717e545bCd59691aC1E4d50f1f94fb6b3;
    
    struct OtterAddOns { 
        string wing;
        string companion;
    }
    mapping(address => uint256) public giveAwayListAlloc;
    mapping(address => bool) public presalerListAlloc;
    mapping(uint256 => uint256) public tokenIdToImageId;
    mapping(uint256 => OtterAddOns) public tokenIdToAddons;
    
    string private _contractURI;
    string private _tokenBaseURI = "ipfs://Qmf41u6GGzoZeJWR3UccXVXvEvmxfrwczSUMvsLec6MU3j/";
	
    uint256 public airDropAmount;
    uint256 public giveAwayAmountMinted;
    uint256 public privateAmountMinted;
    uint256 public totalAmountMinted;
    uint256 public finalShifter;
    
    bytes32 mintingFinalRandRequestId;
    bool public mintingFinalized;
    bool public presaleLive;
    bool public giveAwayLive;
    bool public saleLive;
    bool public companionsAvailable;
    bool public wingsAvailable;
    bool public locked;
    
    
    AggregatorV3Interface internal ethMarketCapFeed;
    AggregatorV3Interface internal btcMarketCapFeed;
    bool public flipped;
    
    bool internal enableKeeper;
    bytes32 internal randomKeyHash;
    uint256 internal randomLinkFee;
    uint256 public randomResult;
    
    // ETH Mainnet params.
    //
    // https://docs.chain.link/docs/ethereum-addresses
    // ethFeed: 0xAA2FE1324b84981832AafCf7Dc6E6Fe6cF124283
    // btcFeed: 0x47E1e89570689c13E723819bf633548d611D630C
    //
    // https://docs.chain.link/docs/vrf-contracts/
    // vrfLinkToken: 0x514910771AF9Ca656af840dff83E8264EcF986CA
    // vrfCoordinator: 0xf0d54349aDdcf704F77AE15b96510dEA15cb7952
    // keyHash: 0xAA77729D3466CA35AE8D28B3BBAC7CC36A5031EFDC430821C02BC31A238AF445
    // Fee: 2000000000000000000 
    //
    // Kovan: 0x9326BFA02ADD2366b30bacB125260Af641031331,0x6135b13325bfC4B00278B4abC5e20bbce2D6580e,0xa36085F69e2889c224210F603D836748e7dC0088,0xdD3782915140c8f3b190B5D67eAc6dc5760C46E9,0x6c3699283bda56ad74f6b855546325b68d482e983852a7a82979cc4807b641f4,100000000000000000
    // Rinkeby: 0x8A753747A1Fa494EC906cE90E9f37563A8AF630e,0x2431452A0010a43878bF198e170F6319Af6d27F4,0x01BE23585060835E02B77ef475b0Cc51aA1e0709,0xb3dCcb4Cf7a26f6cf6B120Cf5A73875B7BBc655B,0x2ed0feb3e7fd2022120aa84fab1945545a9f2ffc9076fd6156fa96eaff4c1311,100000000000000000
    constructor(address ethFeed, address btcFeed, address vrfLinkToken, address vrfCoordinator, bytes32 keyHash, uint256 linkFee) 
        ERC721("Flippening Otters", "FOT") 
        VRFConsumerBase(
            vrfCoordinator, // VRF Coordinator
            vrfLinkToken  // LINK Token
        ) { 
      ethMarketCapFeed = AggregatorV3Interface(ethFeed);
      btcMarketCapFeed = AggregatorV3Interface(btcFeed);
      randomKeyHash = keyHash;
      randomLinkFee = linkFee; // LINK (Varies by network)
    }
    
    modifier notLocked {
        require(!locked, "Contract metadata methods are locked");
        _;
    }

    function increaseGiveAwayBudget(address[] calldata entries) external onlyOwner {
        for(uint256 i = 0; i < entries.length; i++) {
            address entry = entries[i];
            require(entry != address(0), "NULL_ADDRESS");
            giveAwayListAlloc[entry]++;
        }   
    }

    function decreaseGiveAwayBudget(address[] calldata entries) external onlyOwner {
        for(uint256 i = 0; i < entries.length; i++) {
            address entry = entries[i];
            require(entry != address(0), "NULL_ADDRESS");
            giveAwayListAlloc[entry]--;
        }
    }

    function addToPresaleList(address[] calldata entries) external onlyOwner {
        for(uint256 i = 0; i < entries.length; i++) {
            address entry = entries[i];
            require(entry != address(0), "NULL_ADDRESS");
            require(!presalerListAlloc[entry], "DUPLICATE_ENTRY");
            presalerListAlloc[entry] = true;
        }   
    }

    function removeFromPresaleList(address[] calldata entries) external onlyOwner {
        for(uint256 i = 0; i < entries.length; i++) {
            address entry = entries[i];
            require(entry != address(0), "NULL_ADDRESS");
            presalerListAlloc[entry] = false;
        }
    }

    function mint(uint256 tokenQuantity) external payable {
        require(saleLive, "SALE_CLOSED");
        uint256 totalAmountMintedLocal = totalAmountMinted;
        require(totalAmountMintedLocal + tokenQuantity <= OTTER_MAX, "OUT_OF_STOCK");
        require(OTTER_MINT_PRICE * tokenQuantity <= msg.value, "INSUFFICIENT_ETH");
        
        for(uint256 i = 0; i < tokenQuantity; i++) {
            totalAmountMintedLocal++;
            shuffleMint(msg.sender, totalAmountMintedLocal);
        }
        totalAmountMinted = totalAmountMintedLocal;
    }
    
    function presaleBuy(uint256 tokenQuantity) external payable {
        require(presaleLive, "PRESALE_CLOSED");
        uint256 totalAmountMintedLocal = totalAmountMinted;
        uint256 privateAmountMintedLocal = privateAmountMinted;
        require(totalAmountMintedLocal + tokenQuantity <= OTTER_MAX, "OUT_OF_STOCK");
        require(privateAmountMintedLocal + tokenQuantity <= OTTER_PRESALE_MAX, "EXCEED_PRIVATE");
        require(presalerListAlloc[msg.sender], "NOT_ELIGIBLE");
        require(OTTER_PRESALE_PRICE * tokenQuantity <= msg.value, "INSUFFICIENT_ETH");
        
        for (uint256 i = 0; i < tokenQuantity; i++) {
            privateAmountMintedLocal++;
            totalAmountMintedLocal++;
            shuffleMint(msg.sender, totalAmountMintedLocal);
        }
        privateAmountMinted = privateAmountMintedLocal;
        totalAmountMinted = totalAmountMintedLocal;
    }
    
    // Free give away.    
    function giveAwayBuy() external {
        require(giveAwayLive, "GIVE_AWAY_CLOSED");
        require(totalAmountMinted + 1 <= OTTER_MAX, "OUT_OF_STOCK");
        require(giveAwayAmountMinted + 1 <= OTTER_GIVE_AWAY_MAX, "EXCEED_GIVE_AWAY");
        require(giveAwayListAlloc[msg.sender] > 0, "NOT_QUALIFIED");

        giveAwayAmountMinted++;
        giveAwayListAlloc[msg.sender]--;
        totalAmountMinted++;
        shuffleMint(msg.sender, totalAmountMinted);
    }

    function airDrop(address[] calldata receivers) external onlyOwner {
        require(totalAmountMinted + receivers.length <= OTTER_MAX, "MAX_MINT");
        uint256 airDropAmountLocal = airDropAmount;
        uint256 totalAmountMintedLocal = totalAmountMinted;
        require(airDropAmount + receivers.length <= OTTER_AIR_DROP_MAX, "EXCEED_AIR_DROP");
        
        for (uint256 i = 0; i < receivers.length; i++) {
            airDropAmountLocal++;
            totalAmountMintedLocal++;
            shuffleMint(receivers[i], totalAmountMintedLocal);
        }
        airDropAmount = airDropAmountLocal;
        totalAmountMinted = totalAmountMintedLocal;
    }
    
    function updateCompanion(uint256 tokenId, string calldata companionType) external payable {
        require(_exists(tokenId), "Cannot query non-existent token");
        require(companionsAvailable, "Companion changes are not available");
        require(ownerOf(tokenId) == msg.sender, "Only token owner can change companions");
        bool isDelete = compare(companionType, "");
        // Deletion is free.
        require(isDelete || OTTER_COMPANION_PRICE <= msg.value, "INSUFFICIENT_ETH");

        if (isDelete) {
            delete tokenIdToAddons[tokenId].companion;
        } else {
            tokenIdToAddons[tokenId].companion = companionType;
        }
    } 

    function updateWing(uint256 tokenId, string calldata wingType) external payable {
        require(_exists(tokenId), "Cannot query non-existent token");
        require(wingsAvailable, "Wing changes are not available");
        require(ownerOf(tokenId) == msg.sender, "Only token owner can change wings");
        bool isDelete = compare(wingType, "");
        // Deletion is free.
        require(isDelete || OTTER_WING_PRICE <= msg.value, "INSUFFICIENT_ETH");

        if (isDelete) {
            delete tokenIdToAddons[tokenId].wing;
        } else {
            tokenIdToAddons[tokenId].wing = wingType;
        }
    }

    /**
     * Generates a number between 1 to num (inclusive).
     */ 
    function rangedRandomNum(uint256 num) internal view returns (uint256) {
        return rangedRandomNumWithSeed(num, block.timestamp);
    }

    function rangedRandomNumWithSeed(uint256 num, uint256 counter) internal view returns (uint256) {
        return uint256(keccak256(abi.encode(counter, msg.sender, totalAmountMinted, randomResult)))%num + 1;
    }

    // Finalize the allocation of Otters and stop minting forever.
    function finalizeMinting() public onlyOwner {
        if(!mintingFinalized) {
            saleLive = false;
            presaleLive = false;
            giveAwayLive = false;
            mintingFinalRandRequestId = getRandomNumber();
        }
    }

    function shuffleMint(address to, uint256 tokenId) internal {
        require(!mintingFinalized, "Fair minting has already completed");
        uint256 target = rangedRandomNum(tokenId);
        _safeMint(to, tokenId);
        // Swap target and tokenId image mapping.
        tokenIdToImageId[tokenId] = target;
        tokenIdToImageId[target] = tokenId;
        if(tokenId == OTTER_MAX) {
            finalizeMinting();
        }
    }

    
    function withdraw() external onlyOwner {
        payable(gnosis_safe).transfer(address(this).balance);
    }

    function setDesstinationAddress(address addr) external onlyOwner {
        gnosis_safe = addr;
    }
    
    function burn(uint256[] calldata tokenIds) external onlyOwner() {
          for (uint256 i = 0; i < tokenIds.length; i++) {
              _burn(tokenIds[i]);
              delete tokenIdToImageId[tokenIds[i]];
        }
    }
    
    // Owner functions for enabling presale, sale, revealing and setting the provenance hash
    function lockMetadata() external onlyOwner {
        locked = true;
    }
    
    function togglePresaleStatus() external onlyOwner {
        presaleLive = !presaleLive;
    }

    function toggleGiveAwayStatus() external onlyOwner {
        giveAwayLive = !giveAwayLive;
    }
    
    function toggleSaleStatus() external onlyOwner {
        saleLive = !saleLive;
    }

    function toggleCompanionsAvailable() external onlyOwner {
        companionsAvailable = !companionsAvailable;
    }

    function toggleWingsAvailable() external onlyOwner {
        wingsAvailable = !wingsAvailable;
    }
    
    function contractURI() public view returns (string memory) {
        return _contractURI;
    }
    
    function tokenURI(uint256 tokenId) public view override(ERC721) returns (string memory) {
        require(_exists(tokenId), "Cannot query non-existent token");
        require(tokenIdToImageId[tokenId] > 0, "Cannot query non-existent imageId");
        
        uint256 imageId = 0; // "Wait for minting to complete"
        if(mintingFinalized) {
            imageId = tokenIdToImageId[tokenId];
            if(tokenId != FLIPPENING_OTTER_TOKEN_ID) {
                imageId = (imageId + finalShifter)%OTTER_MAX + 1;
            }
        }

        string memory uri = string(abi.encodePacked(_tokenBaseURI, Strings.toString(imageId), "/base"));
        if(bytes(tokenIdToAddons[tokenId].wing).length != 0) {
            uri = string(abi.encodePacked(uri, "_", tokenIdToAddons[tokenId].wing));
        }
        if(bytes(tokenIdToAddons[tokenId].companion).length != 0) {
            uri = string(abi.encodePacked(uri, "_", tokenIdToAddons[tokenId].companion));
        }
        uri = string(abi.encodePacked(uri, ".json"));
        return uri;
    }
    
    function compare(string memory s1, string memory s2) public pure returns (bool) {
        return keccak256(abi.encodePacked(s1)) == keccak256(abi.encodePacked(s2));
    }

    function updateLinkFee(uint256 linkFee) external onlyOwner {
      randomLinkFee = linkFee;
    }
    
    
    function updateKeyHash(bytes32 keyHash) external onlyOwner {
      randomKeyHash = keyHash;
    }
    
    /** 
     * Requests randomness 
     */
    function getRandomNumber() public onlyOwner returns (bytes32 requestId) {
        require(LINK.balanceOf(address(this)) >= randomLinkFee, "Not enough LINK - fill contract with faucet");
        return requestRandomness(randomKeyHash, randomLinkFee);
    }

    /**
     * Callback function used by VRF Coordinator
     */
    function fulfillRandomness(bytes32 requestId, uint256 randomness) internal override {
        if(mintingFinalRandRequestId == requestId) {
            mintingFinalized = true;
            // All tokenId to imageId shifted by finalShifter, except Flippening Otter.
            finalShifter = randomness%OTTER_MAX;        
        } else {
            randomResult = randomness;
        }
    }
    
    // TODO: change it to internal function after testing.
    function isFlipped() public view returns (bool) {
        (, int256 btcMarketCap,,,) = btcMarketCapFeed.latestRoundData();
        (, int256 ethMarketCap,,,) = ethMarketCapFeed.latestRoundData();
        return btcMarketCap <= ethMarketCap ;
    }

	function setEnableKeeper() public onlyOwner {
		enableKeeper = true;
	}
    
    function checkUpkeep(bytes calldata /* checkData */) external view override returns (bool upkeepNeeded, bytes memory /* performData */) {
        upkeepNeeded = enableKeeper && !flipped && isFlipped();
        // We don't use the checkData in this. The checkData is defined when the Upkeep was registered.
    }

    function performUpkeep(bytes calldata /* performData */) external override {
        require(!flipped, "Flippening otter should only be assigned once");
        require(isFlipped(), "Flippening event must have already happened");
        // Mint the Flippening Otter
        flipped = true;
        uint256 counter = block.timestamp;
        uint256 tokenId = rangedRandomNumWithSeed(totalAmountMinted, counter);
        // Find a tokenId with valid owner. This is required to handle burned tokens.
        while(ownerOf(tokenId) == address(0)) {
            counter++;
            tokenId = rangedRandomNumWithSeed(totalAmountMinted, counter);
        }
        // Assign Flippening Otter to owner of one of the existing otters.
        _safeMint(ownerOf(tokenId), FLIPPENING_OTTER_TOKEN_ID);
        tokenIdToImageId[FLIPPENING_OTTER_TOKEN_ID] = FLIPPENING_OTTER_TOKEN_ID;
    } 

    function setContractURI(string calldata URI) external onlyOwner notLocked {
        _contractURI = URI;
    }

    function setBaseURI(string calldata URI) external onlyOwner notLocked {
        _tokenBaseURI = URI;
    }

    function setOtterMintPrice(uint256 price) external onlyOwner {
        OTTER_MINT_PRICE = price;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

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

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

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

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

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

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

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

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

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

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

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

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

// SPDX-License-Identifier: MIT

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 overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` 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);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

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

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

// SPDX-License-Identifier: MIT

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() {
        _setOwner(_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 {
        _setOwner(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");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

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

interface LinkTokenInterface {

  function allowance(
    address owner,
    address spender
  )
    external
    view
    returns (
      uint256 remaining
    );

  function approve(
    address spender,
    uint256 value
  )
    external
    returns (
      bool success
    );

  function balanceOf(
    address owner
  )
    external
    view
    returns (
      uint256 balance
    );

  function decimals()
    external
    view
    returns (
      uint8 decimalPlaces
    );

  function decreaseApproval(
    address spender,
    uint256 addedValue
  )
    external
    returns (
      bool success
    );

  function increaseApproval(
    address spender,
    uint256 subtractedValue
  ) external;

  function name()
    external
    view
    returns (
      string memory tokenName
    );

  function symbol()
    external
    view
    returns (
      string memory tokenSymbol
    );

  function totalSupply()
    external
    view
    returns (
      uint256 totalTokensIssued
    );

  function transfer(
    address to,
    uint256 value
  )
    external
    returns (
      bool success
    );

  function transferAndCall(
    address to,
    uint256 value,
    bytes calldata data
  )
    external
    returns (
      bool success
    );

  function transferFrom(
    address from,
    address to,
    uint256 value
  )
    external
    returns (
      bool success
    );

}

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

interface KeeperCompatibleInterface {

  /**
   * @notice checks if the contract requires work to be done.
   * @param checkData data passed to the contract when checking for upkeep.
   * @return upkeepNeeded boolean to indicate whether the keeper should call
   * performUpkeep or not.
   * @return performData bytes that the keeper should call performUpkeep with,
   * if upkeep is needed.
   */
  function checkUpkeep(
    bytes calldata checkData
  )
    external
    returns (
      bool upkeepNeeded,
      bytes memory performData
    );

  /**
   * @notice Performs work on the contract. Executed by the keepers, via the registry.
   * @param performData is the data which was passed back from the checkData
   * simulation.
   */
  function performUpkeep(
    bytes calldata performData
  ) external;
}

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

interface AggregatorV3Interface {

  function decimals()
    external
    view
    returns (
      uint8
    );

  function description()
    external
    view
    returns (
      string memory
    );

  function version()
    external
    view
    returns (
      uint256
    );

  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(
    uint80 _roundId
  )
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

}

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

contract VRFRequestIDBase {

  /**
   * @notice returns the seed which is actually input to the VRF coordinator
   *
   * @dev To prevent repetition of VRF output due to repetition of the
   * @dev user-supplied seed, that seed is combined in a hash with the
   * @dev user-specific nonce, and the address of the consuming contract. The
   * @dev risk of repetition is mostly mitigated by inclusion of a blockhash in
   * @dev the final seed, but the nonce does protect against repetition in
   * @dev requests which are included in a single block.
   *
   * @param _userSeed VRF seed input provided by user
   * @param _requester Address of the requesting contract
   * @param _nonce User-specific nonce at the time of the request
   */
  function makeVRFInputSeed(
    bytes32 _keyHash,
    uint256 _userSeed,
    address _requester,
    uint256 _nonce
  )
    internal
    pure
    returns (
      uint256
    )
  {
    return uint256(keccak256(abi.encode(_keyHash, _userSeed, _requester, _nonce)));
  }

  /**
   * @notice Returns the id for this request
   * @param _keyHash The serviceAgreement ID to be used for this request
   * @param _vRFInputSeed The seed to be passed directly to the VRF
   * @return The id for this request
   *
   * @dev Note that _vRFInputSeed is not the seed passed by the consuming
   * @dev contract, but the one generated by makeVRFInputSeed
   */
  function makeRequestId(
    bytes32 _keyHash,
    uint256 _vRFInputSeed
  )
    internal
    pure
    returns (
      bytes32
    )
  {
    return keccak256(abi.encodePacked(_keyHash, _vRFInputSeed));
  }
}

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

import "./interfaces/LinkTokenInterface.sol";

import "./VRFRequestIDBase.sol";

/** ****************************************************************************
 * @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.
 * *****************************************************************************
 * @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     constuctor(<other arguments>, address _vrfCoordinator, address _link)
 * @dev       VRFConsumerBase(_vrfCoordinator, _link) 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), and have told you the minimum LINK
 * @dev price for VRF service. Make sure your contract has sufficient LINK, and
 * @dev call requestRandomness(keyHash, fee, seed), where seed is the input you
 * @dev want to generate randomness from.
 *
 * @dev Once the VRFCoordinator has received and validated the oracle's response
 * @dev to your request, it will call your contract's fulfillRandomness method.
 *
 * @dev The randomness argument to fulfillRandomness is the actual random value
 * @dev generated from your seed.
 *
 * @dev The requestId argument is generated from the keyHash and the seed by
 * @dev makeRequestId(keyHash, seed). If your contract could have concurrent
 * @dev requests open, you can use the requestId to track which seed is
 * @dev associated with which randomness. See VRFRequestIDBase.sol for more
 * @dev details. (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. (Which is critical to making unpredictable randomness! See the
 * @dev next section.)
 *
 * *****************************************************************************
 * @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 ultimate input to the VRF is mixed with the block hash of the
 * @dev block in which the request is made, user-provided seeds have no impact
 * @dev on its economic security properties. They are only included for API
 * @dev compatability with previous versions of this contract.
 *
 * @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.
 */
abstract contract VRFConsumerBase is VRFRequestIDBase {

  /**
   * @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 VRFConsumerBase 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 randomness the VRF output
   */
  function fulfillRandomness(
    bytes32 requestId,
    uint256 randomness
  )
    internal
    virtual;

  /**
   * @dev In order to keep backwards compatibility we have kept the user
   * seed field around. We remove the use of it because given that the blockhash
   * enters later, it overrides whatever randomness the used seed provides.
   * Given that it adds no security, and can easily lead to misunderstandings,
   * we have removed it from usage and can now provide a simpler API.
   */
  uint256 constant private USER_SEED_PLACEHOLDER = 0;

  /**
   * @notice requestRandomness initiates a request for VRF output given _seed
   *
   * @dev The fulfillRandomness method receives the output, once it's provided
   * @dev by the Oracle, and verified by the vrfCoordinator.
   *
   * @dev The _keyHash must already be registered with the VRFCoordinator, and
   * @dev the _fee must exceed the fee specified during registration of the
   * @dev _keyHash.
   *
   * @dev The _seed parameter is vestigial, and is kept only for API
   * @dev compatibility with older versions. It can't *hurt* to mix in some of
   * @dev your own randomness, here, but it's not necessary because the VRF
   * @dev oracle will mix the hash of the block containing your request into the
   * @dev VRF seed it ultimately uses.
   *
   * @param _keyHash ID of public key against which randomness is generated
   * @param _fee The amount of LINK to send with the request
   *
   * @return requestId unique ID for this request
   *
   * @dev The returned requestId can be used to distinguish responses to
   * @dev concurrent requests. It is passed as the first argument to
   * @dev fulfillRandomness.
   */
  function requestRandomness(
    bytes32 _keyHash,
    uint256 _fee
  )
    internal
    returns (
      bytes32 requestId
    )
  {
    LINK.transferAndCall(vrfCoordinator, _fee, abi.encode(_keyHash, USER_SEED_PLACEHOLDER));
    // This is the seed passed to VRFCoordinator. The oracle will mix this with
    // the hash of the block containing this request to obtain the seed/input
    // which is finally passed to the VRF cryptographic machinery.
    uint256 vRFSeed  = makeVRFInputSeed(_keyHash, USER_SEED_PLACEHOLDER, address(this), nonces[_keyHash]);
    // nonces[_keyHash] must stay in sync with
    // VRFCoordinator.nonces[_keyHash][this], which was incremented by the above
    // successful LINK.transferAndCall (in VRFCoordinator.randomnessRequest).
    // This provides protection against the user repeating their input seed,
    // which would result in a predictable/duplicate output, if multiple such
    // requests appeared in the same block.
    nonces[_keyHash] = nonces[_keyHash] + 1;
    return makeRequestId(_keyHash, vRFSeed);
  }

  LinkTokenInterface immutable internal LINK;
  address immutable private vrfCoordinator;

  // Nonces for each VRF key from which randomness has been requested.
  //
  // Must stay in sync with VRFCoordinator[_keyHash][this]
  mapping(bytes32 /* keyHash */ => uint256 /* nonce */) private nonces;

  /**
   * @param _vrfCoordinator address of VRFCoordinator contract
   * @param _link address of LINK token contract
   *
   * @dev https://docs.chain.link/docs/link-token-contracts
   */
  constructor(
    address _vrfCoordinator,
    address _link
  ) {
    vrfCoordinator = _vrfCoordinator;
    LINK = LinkTokenInterface(_link);
  }

  // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF
  // proof. rawFulfillRandomness then calls fulfillRandomness, after validating
  // the origin of the call
  function rawFulfillRandomness(
    bytes32 requestId,
    uint256 randomness
  )
    external
  {
    require(msg.sender == vrfCoordinator, "Only VRFCoordinator can fulfill");
    fulfillRandomness(requestId, randomness);
  }
}

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

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000000000000000000000000aa2fe1324b84981832aafcf7dc6e6fe6cf12428300000000000000000000000047e1e89570689c13e723819bf633548d611d630c000000000000000000000000514910771af9ca656af840dff83e8264ecf986ca000000000000000000000000f0d54349addcf704f77ae15b96510dea15cb7952aa77729d3466ca35ae8d28b3bbac7cc36a5031efdc430821c02bc31a238af4450000000000000000000000000000000000000000000000001bc16d674ec80000

-----Decoded View---------------
Arg [0] : ethFeed (address): 0xAA2FE1324b84981832AafCf7Dc6E6Fe6cF124283
Arg [1] : btcFeed (address): 0x47E1e89570689c13E723819bf633548d611D630C
Arg [2] : vrfLinkToken (address): 0x514910771AF9Ca656af840dff83E8264EcF986CA
Arg [3] : vrfCoordinator (address): 0xf0d54349aDdcf704F77AE15b96510dEA15cb7952
Arg [4] : keyHash (bytes32): 0xaa77729d3466ca35ae8d28b3bbac7cc36a5031efdc430821c02bc31a238af445
Arg [5] : linkFee (uint256): 2000000000000000000

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 000000000000000000000000aa2fe1324b84981832aafcf7dc6e6fe6cf124283
Arg [1] : 00000000000000000000000047e1e89570689c13e723819bf633548d611d630c
Arg [2] : 000000000000000000000000514910771af9ca656af840dff83e8264ecf986ca
Arg [3] : 000000000000000000000000f0d54349addcf704f77ae15b96510dea15cb7952
Arg [4] : aa77729d3466ca35ae8d28b3bbac7cc36a5031efdc430821c02bc31a238af445
Arg [5] : 0000000000000000000000000000000000000000000000001bc16d674ec80000