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// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

import "@openzeppelin/contracts/access/Ownable.sol";

contract PriceFeedStore is Ownable {
    address public xOracle;
    string public name;
    uint256 public tokenIndex;
    uint256 public decimals;

    // price store
    struct PriceData {
        uint256 price;
        uint256 latestPrice;
        uint256 timestamp;
    }
    mapping(uint256 => PriceData) public pricesData;
    uint256 public latestRound;
    uint256 public latestTimestamp;

    event UpdatePrice(uint256 indexed tokenIndex, uint256 roundId, uint256 price, uint256 latestPrice, uint256 timestamp);
    event SetXOracle(address xOracle);

    modifier onlyXOracle() {
        require(xOracle == msg.sender, "xOracle: forbidden");
        _;
    }

    constructor(address _xOracle, string memory _name, uint256 _tokenIndex, uint256 _decimals) {
        require(_xOracle != address(0), "address invalid");
        xOracle = _xOracle;
        name = _name;
        tokenIndex = _tokenIndex;
        decimals = _decimals;
    }

    // ------------------------------
    // xOracle setPrice
    // ------------------------------
    function setPrice(uint256 _price, uint256 _timestamp) external onlyXOracle { 
        // Sometimes the fulfill request is not in order in a short time.
        // So it's possible that the price is not the latest price.
        // _price is the fulfilling price, but latestPrice is the newest price at the time.
        uint256 latestPrice;
        if (_timestamp > latestTimestamp) {
            latestPrice = _price;
            latestTimestamp = _timestamp;
        } else {
            latestPrice = pricesData[latestRound].latestPrice;
        }

        // next round
        latestRound++;

        // already checked correct tokenIndex in xOracle.setPriceFeedStore
        pricesData[latestRound] = PriceData({
            price: _price,
            latestPrice: latestPrice,
            timestamp: block.timestamp
        });

        emit UpdatePrice(tokenIndex, latestRound, _price, latestPrice, block.timestamp);
    }

    // ------------------------------
    // onlyOwner
    // ------------------------------
    function setXOracle(address _xOracle) external onlyOwner {
        require(_xOracle != address(0), "address invalid");
        xOracle = _xOracle;
        emit SetXOracle(_xOracle);
    }

    // ------------------------------
    // view function
    // ------------------------------
    function getLastPrice() external view returns (uint256, uint256, uint256, uint256) {
        PriceData memory priceData = pricesData[latestRound];
        return (
            latestRound, 
            priceData.price, 
            priceData.latestPrice, 
            priceData.timestamp
        );
    }

    function getPrice(uint256 _roundId) external view returns (uint256, uint256, uint256, uint256) {
        PriceData memory priceData = pricesData[_roundId];
        return (
            _roundId, 
            priceData.price, 
            priceData.latestPrice, 
            priceData.timestamp
        );
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

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

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

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

pragma solidity ^0.8.0;

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

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

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

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[{"inputs":[{"internalType":"address","name":"_xOracle","type":"address"},{"internalType":"string","name":"_name","type":"string"},{"internalType":"uint256","name":"_tokenIndex","type":"uint256"},{"internalType":"uint256","name":"_decimals","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"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":false,"internalType":"address","name":"xOracle","type":"address"}],"name":"SetXOracle","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"tokenIndex","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"roundId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"price","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"latestPrice","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"UpdatePrice","type":"event"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getLastPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_roundId","type":"uint256"}],"name":"getPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRound","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"pricesData","outputs":[{"internalType":"uint256","name":"price","type":"uint256"},{"internalType":"uint256","name":"latestPrice","type":"uint256"},{"internalType":"uint256","name":"timestamp","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_price","type":"uint256"},{"internalType":"uint256","name":"_timestamp","type":"uint256"}],"name":"setPrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_xOracle","type":"address"}],"name":"setXOracle","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"tokenIndex","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":"xOracle","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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