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// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;

import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import {Initializable} from "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import {INFTOracle} from "../interfaces/INFTOracle.sol";
import {BlockContext} from "../utils/BlockContext.sol";

contract NFTOracle is INFTOracle, Initializable, OwnableUpgradeable, BlockContext {
  modifier onlyAdmin() {
    require(_msgSender() == priceFeedAdmin, "NFTOracle: !admin");
    _;
  }

  event AssetAdded(address indexed asset);
  event AssetRemoved(address indexed asset);
  event FeedAdminUpdated(address indexed admin);
  event SetAssetData(address indexed asset, uint256 price, uint256 timestamp, uint256 roundId);
  event SetAssetTwapPrice(address indexed asset, uint256 price, uint256 timestamp);

  struct NFTPriceData {
    uint256 roundId;
    uint256 price;
    uint256 timestamp;
  }

  struct NFTPriceFeed {
    bool registered;
    NFTPriceData[] nftPriceData;
  }

  address public priceFeedAdmin;

  // key is nft contract address
  mapping(address => NFTPriceFeed) public nftPriceFeedMap;
  address[] public nftPriceFeedKeys;

  // data validity check parameters
  uint256 private constant DECIMAL_PRECISION = 10**18;
  // Maximum deviation allowed between two consecutive oracle prices. 18-digit precision.
  uint256 public maxPriceDeviation; // 20%,18-digit precision.
  // The maximum allowed deviation between two consecutive oracle prices within a certain time frame. 18-bit precision.
  uint256 public maxPriceDeviationWithTime; // 10%
  uint256 public timeIntervalWithPrice; // 30 minutes
  uint256 public minUpdateTime; // 10 minutes

  mapping(address => bool) public nftPaused;

  modifier whenNotPaused(address _nftContract) {
    _whenNotPaused(_nftContract);
    _;
  }

  uint256 public twapInterval;
  mapping(address => uint256) public twapPriceMap;

  function _whenNotPaused(address _nftContract) internal view {
    bool _paused = nftPaused[_nftContract];
    require(!_paused, "NFTOracle: nft price feed paused");
  }

  function initialize(
    address _admin,
    uint256 _maxPriceDeviation,
    uint256 _maxPriceDeviationWithTime,
    uint256 _timeIntervalWithPrice,
    uint256 _minUpdateTime,
    uint256 _twapInterval
  ) public initializer {
    __Ownable_init();
    priceFeedAdmin = _admin;
    maxPriceDeviation = _maxPriceDeviation;
    maxPriceDeviationWithTime = _maxPriceDeviationWithTime;
    timeIntervalWithPrice = _timeIntervalWithPrice;
    minUpdateTime = _minUpdateTime;
    twapInterval = _twapInterval;
  }

  function setPriceFeedAdmin(address _admin) external onlyOwner {
    priceFeedAdmin = _admin;
    emit FeedAdminUpdated(_admin);
  }

  function setAssets(address[] calldata _nftContracts) external onlyOwner {
    for (uint256 i = 0; i < _nftContracts.length; i++) {
      _addAsset(_nftContracts[i]);
    }
  }

  function addAsset(address _nftContract) external onlyOwner {
    _addAsset(_nftContract);
  }

  function _addAsset(address _nftContract) internal {
    requireKeyExisted(_nftContract, false);
    nftPriceFeedMap[_nftContract].registered = true;
    nftPriceFeedKeys.push(_nftContract);
    emit AssetAdded(_nftContract);
  }

  function removeAsset(address _nftContract) external onlyOwner {
    requireKeyExisted(_nftContract, true);
    delete nftPriceFeedMap[_nftContract];

    uint256 length = nftPriceFeedKeys.length;
    for (uint256 i = 0; i < length; i++) {
      if (nftPriceFeedKeys[i] == _nftContract) {
        nftPriceFeedKeys[i] = nftPriceFeedKeys[length - 1];
        nftPriceFeedKeys.pop();
        break;
      }
    }
    emit AssetRemoved(_nftContract);
  }

  function setAssetData(address _nftContract, uint256 _price) external override onlyAdmin whenNotPaused(_nftContract) {
    uint256 _timestamp = _blockTimestamp();
    _setAssetData(_nftContract, _price, _timestamp);
  }

  function setMultipleAssetsData(address[] calldata _nftContracts, uint256[] calldata _prices)
    external
    override
    onlyAdmin
  {
    require(_nftContracts.length == _prices.length, "NFTOracle: data length not match");
    uint256 _timestamp = _blockTimestamp();
    for (uint256 i = 0; i < _nftContracts.length; i++) {
      bool _paused = nftPaused[_nftContracts[i]];
      if (!_paused) {
        _setAssetData(_nftContracts[i], _prices[i], _timestamp);
      }
    }
  }

  function _setAssetData(
    address _nftContract,
    uint256 _price,
    uint256 _timestamp
  ) internal {
    requireKeyExisted(_nftContract, true);
    require(_timestamp > getLatestTimestamp(_nftContract), "NFTOracle: incorrect timestamp");
    require(_price > 0, "NFTOracle: price can not be 0");
    bool dataValidity = checkValidityOfPrice(_nftContract, _price, _timestamp);
    require(dataValidity, "NFTOracle: invalid price data");
    uint256 len = getPriceFeedLength(_nftContract);
    NFTPriceData memory data = NFTPriceData({price: _price, timestamp: _timestamp, roundId: len});
    nftPriceFeedMap[_nftContract].nftPriceData.push(data);

    uint256 twapPrice = calculateTwapPrice(_nftContract);
    twapPriceMap[_nftContract] = twapPrice;

    emit SetAssetData(_nftContract, _price, _timestamp, len);
    emit SetAssetTwapPrice(_nftContract, twapPrice, _timestamp);
  }

  function getAssetPrice(address _nftContract) external view override returns (uint256) {
    require(isExistedKey(_nftContract), "NFTOracle: key not existed");
    uint256 len = getPriceFeedLength(_nftContract);
    require(len > 0, "NFTOracle: no price data");
    uint256 twapPrice = twapPriceMap[_nftContract];
    if (twapPrice == 0) {
      return nftPriceFeedMap[_nftContract].nftPriceData[len - 1].price;
    } else {
      return twapPrice;
    }
  }

  function getLatestTimestamp(address _nftContract) public view override returns (uint256) {
    require(isExistedKey(_nftContract), "NFTOracle: key not existed");
    uint256 len = getPriceFeedLength(_nftContract);
    if (len == 0) {
      return 0;
    }
    return nftPriceFeedMap[_nftContract].nftPriceData[len - 1].timestamp;
  }

  function calculateTwapPrice(address _nftContract) public view returns (uint256) {
    require(isExistedKey(_nftContract), "NFTOracle: key not existed");
    require(twapInterval != 0, "NFTOracle: interval can't be 0");

    uint256 len = getPriceFeedLength(_nftContract);
    require(len > 0, "NFTOracle: Not enough history");
    uint256 round = len - 1;
    NFTPriceData memory priceRecord = nftPriceFeedMap[_nftContract].nftPriceData[round];
    uint256 latestTimestamp = priceRecord.timestamp;
    uint256 baseTimestamp = _blockTimestamp() - twapInterval;
    // if latest updated timestamp is earlier than target timestamp, return the latest price.
    if (latestTimestamp < baseTimestamp || round == 0) {
      return priceRecord.price;
    }

    // rounds are like snapshots, latestRound means the latest price snapshot. follow chainlink naming
    uint256 cumulativeTime = _blockTimestamp() - latestTimestamp;
    uint256 previousTimestamp = latestTimestamp;
    uint256 weightedPrice = priceRecord.price * cumulativeTime;
    while (true) {
      if (round == 0) {
        // if cumulative time is less than requested interval, return current twap price
        return weightedPrice / cumulativeTime;
      }

      round = round - 1;
      // get current round timestamp and price
      priceRecord = nftPriceFeedMap[_nftContract].nftPriceData[round];
      uint256 currentTimestamp = priceRecord.timestamp;
      uint256 price = priceRecord.price;

      // check if current round timestamp is earlier than target timestamp
      if (currentTimestamp <= baseTimestamp) {
        // weighted time period will be (target timestamp - previous timestamp). For example,
        // now is 1000, twapInterval is 100, then target timestamp is 900. If timestamp of current round is 970,
        // and timestamp of NEXT round is 880, then the weighted time period will be (970 - 900) = 70,
        // instead of (970 - 880)
        weightedPrice = weightedPrice + (price * (previousTimestamp - baseTimestamp));
        break;
      }

      uint256 timeFraction = previousTimestamp - currentTimestamp;
      weightedPrice = weightedPrice + price * timeFraction;
      cumulativeTime = cumulativeTime + timeFraction;
      previousTimestamp = currentTimestamp;
    }
    return weightedPrice / twapInterval;
  }

  function getPreviousPrice(address _nftContract, uint256 _numOfRoundBack) public view override returns (uint256) {
    require(isExistedKey(_nftContract), "NFTOracle: key not existed");

    uint256 len = getPriceFeedLength(_nftContract);
    require(len > 0 && _numOfRoundBack < len, "NFTOracle: Not enough history");
    return nftPriceFeedMap[_nftContract].nftPriceData[len - _numOfRoundBack - 1].price;
  }

  function getPreviousTimestamp(address _nftContract, uint256 _numOfRoundBack) public view override returns (uint256) {
    require(isExistedKey(_nftContract), "NFTOracle: key not existed");

    uint256 len = getPriceFeedLength(_nftContract);
    require(len > 0 && _numOfRoundBack < len, "NFTOracle: Not enough history");
    return nftPriceFeedMap[_nftContract].nftPriceData[len - _numOfRoundBack - 1].timestamp;
  }

  function getPriceFeedLength(address _nftContract) public view returns (uint256 length) {
    return nftPriceFeedMap[_nftContract].nftPriceData.length;
  }

  function getLatestRoundId(address _nftContract) public view returns (uint256) {
    uint256 len = getPriceFeedLength(_nftContract);
    if (len == 0) {
      return 0;
    }
    return nftPriceFeedMap[_nftContract].nftPriceData[len - 1].roundId;
  }

  function isExistedKey(address _nftContract) private view returns (bool) {
    return nftPriceFeedMap[_nftContract].registered;
  }

  function requireKeyExisted(address _key, bool _existed) private view {
    if (_existed) {
      require(isExistedKey(_key), "NFTOracle: key not existed");
    } else {
      require(!isExistedKey(_key), "NFTOracle: key existed");
    }
  }

  function checkValidityOfPrice(
    address _nftContract,
    uint256 _price,
    uint256 _timestamp
  ) private view returns (bool) {
    uint256 len = getPriceFeedLength(_nftContract);
    if (len > 0) {
      uint256 price = nftPriceFeedMap[_nftContract].nftPriceData[len - 1].price;
      if (_price == price) {
        return true;
      }
      uint256 timestamp = nftPriceFeedMap[_nftContract].nftPriceData[len - 1].timestamp;
      uint256 percentDeviation;
      if (_price > price) {
        percentDeviation = ((_price - price) * DECIMAL_PRECISION) / price;
      } else {
        percentDeviation = ((price - _price) * DECIMAL_PRECISION) / price;
      }
      uint256 timeDeviation = _timestamp - timestamp;
      if (percentDeviation > maxPriceDeviation) {
        return false;
      } else if (timeDeviation < minUpdateTime) {
        return false;
      } else if ((percentDeviation > maxPriceDeviationWithTime) && (timeDeviation < timeIntervalWithPrice)) {
        return false;
      }
    }
    return true;
  }

  function setDataValidityParameters(
    uint256 _maxPriceDeviation,
    uint256 _maxPriceDeviationWithTime,
    uint256 _timeIntervalWithPrice,
    uint256 _minUpdateTime
  ) external onlyOwner {
    maxPriceDeviation = _maxPriceDeviation;
    maxPriceDeviationWithTime = _maxPriceDeviationWithTime;
    timeIntervalWithPrice = _timeIntervalWithPrice;
    minUpdateTime = _minUpdateTime;
  }

  function setPause(address _nftContract, bool val) external override onlyOwner {
    nftPaused[_nftContract] = val;
  }

  function setTwapInterval(uint256 _twapInterval) external override onlyOwner {
    twapInterval = _twapInterval;
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.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 OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _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);
    }
    uint256[49] private __gap;
}

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

pragma solidity ^0.8.0;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} modifier, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;

/************
@title INFTOracle interface
@notice Interface for NFT price oracle.*/
interface INFTOracle {
  /* CAUTION: Price uint is ETH based (WEI, 18 decimals) */
  // get asset price
  function getAssetPrice(address _nftContract) external view returns (uint256);

  // get latest timestamp
  function getLatestTimestamp(address _nftContract) external view returns (uint256);

  // get previous price with _back rounds
  function getPreviousPrice(address _nftContract, uint256 _numOfRoundBack) external view returns (uint256);

  // get previous timestamp with _back rounds
  function getPreviousTimestamp(address _nftContract, uint256 _numOfRoundBack) external view returns (uint256);

  function setAssetData(address _nftContract, uint256 _price) external;

  function setMultipleAssetsData(address[] calldata _nftContracts, uint256[] calldata _prices) external;

  function setPause(address _nftContract, bool val) external;

  function setTwapInterval(uint256 _twapInterval) external;
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.8.4;

// wrap block.xxx functions for testing
// only support timestamp and number so far
abstract contract BlockContext {
  //◥◤◥◤◥◤◥◤◥◤◥◤◥◤◥◤ add state variables below ◥◤◥◤◥◤◥◤◥◤◥◤◥◤◥◤//

  //◢◣◢◣◢◣◢◣◢◣◢◣◢◣◢◣ add state variables above ◢◣◢◣◢◣◢◣◢◣◢◣◢◣◢◣//
  uint256[50] private __gap;

  function _blockTimestamp() internal view virtual returns (uint256) {
    return block.timestamp;
  }

  function _blockNumber() internal view virtual returns (uint256) {
    return block.number;
  }
}

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

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
    uint256[50] private __gap;
}

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

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @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 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);
            }
        }
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"asset","type":"address"}],"name":"AssetAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"asset","type":"address"}],"name":"AssetRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"admin","type":"address"}],"name":"FeedAdminUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"asset","type":"address"},{"indexed":false,"internalType":"uint256","name":"price","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"roundId","type":"uint256"}],"name":"SetAssetData","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"asset","type":"address"},{"indexed":false,"internalType":"uint256","name":"price","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"SetAssetTwapPrice","type":"event"},{"inputs":[{"internalType":"address","name":"_nftContract","type":"address"}],"name":"addAsset","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContract","type":"address"}],"name":"calculateTwapPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContract","type":"address"}],"name":"getAssetPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContract","type":"address"}],"name":"getLatestRoundId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContract","type":"address"}],"name":"getLatestTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContract","type":"address"},{"internalType":"uint256","name":"_numOfRoundBack","type":"uint256"}],"name":"getPreviousPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContract","type":"address"},{"internalType":"uint256","name":"_numOfRoundBack","type":"uint256"}],"name":"getPreviousTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContract","type":"address"}],"name":"getPriceFeedLength","outputs":[{"internalType":"uint256","name":"length","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_admin","type":"address"},{"internalType":"uint256","name":"_maxPriceDeviation","type":"uint256"},{"internalType":"uint256","name":"_maxPriceDeviationWithTime","type":"uint256"},{"internalType":"uint256","name":"_timeIntervalWithPrice","type":"uint256"},{"internalType":"uint256","name":"_minUpdateTime","type":"uint256"},{"internalType":"uint256","name":"_twapInterval","type":"uint256"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"maxPriceDeviation","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxPriceDeviationWithTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minUpdateTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nftPaused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"nftPriceFeedKeys","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nftPriceFeedMap","outputs":[{"internalType":"bool","name":"registered","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"priceFeedAdmin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContract","type":"address"}],"name":"removeAsset","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContract","type":"address"},{"internalType":"uint256","name":"_price","type":"uint256"}],"name":"setAssetData","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"_nftContracts","type":"address[]"}],"name":"setAssets","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_maxPriceDeviation","type":"uint256"},{"internalType":"uint256","name":"_maxPriceDeviationWithTime","type":"uint256"},{"internalType":"uint256","name":"_timeIntervalWithPrice","type":"uint256"},{"internalType":"uint256","name":"_minUpdateTime","type":"uint256"}],"name":"setDataValidityParameters","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"_nftContracts","type":"address[]"},{"internalType":"uint256[]","name":"_prices","type":"uint256[]"}],"name":"setMultipleAssetsData","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_nftContract","type":"address"},{"internalType":"bool","name":"val","type":"bool"}],"name":"setPause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_admin","type":"address"}],"name":"setPriceFeedAdmin","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_twapInterval","type":"uint256"}],"name":"setTwapInterval","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"timeIntervalWithPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"twapInterval","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"twapPriceMap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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