// File: /contracts/CurrencyOracle.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.2;

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

/// @title CurrencyOracle
/// @notice This handles all the operations related currency exchange

contract CurrencyOracle is Ownable {
    event feedAddressSet(
        address indexed feedAddress,
        bytes32 indexed fromCurrency,
        bytes32 indexed toCurrency
    );

    /// @dev mapping b/w encoded bytes32 of currecies and chainLink Date Feed proxy Address
    mapping(bytes32 => address) public dataFeedAddressMapper;

    /// @notice Allows adding mapping b/w encoded bytes32 of currecies and chainLink Date Feed proxy Address
    /// @param _fromCurrency _fromCurrency
    /// @param _toCurrency _toCurrency
    /// @param _feedAddress proxyaddress of chainLinkDataFeed

    function setOracleFeedAddress(
        bytes32 _fromCurrency,
        bytes32 _toCurrency,
        address _feedAddress
    ) external onlyOwner {
        dataFeedAddressMapper[
            keccak256(abi.encodePacked(_fromCurrency, _toCurrency))
        ] = _feedAddress;
        emit feedAddressSet(_feedAddress, _fromCurrency, _toCurrency);
    }

    /// @notice to get latest price and decimals
    /// @param _fromCurrency _fromCurrency
    /// @param _toCurrency _toCurrency
    /// @return lastestPrice  returns latest price of coversion
    /// @return decimals  returns decimals of  priceCoversion

    function getFeedLatestPriceAndDecimals(
        bytes32 _fromCurrency,
        bytes32 _toCurrency
    ) external view returns (uint64 lastestPrice, uint8 decimals) {
        address feedAddress = dataFeedAddressMapper[
            keccak256(abi.encodePacked(_fromCurrency, _toCurrency))
        ];
        require(feedAddress != address(0), "ECDE");
        AggregatorV3Interface prcieFeed = AggregatorV3Interface(feedAddress);
        (, int256 price, , , ) = prcieFeed.latestRoundData();
        return (uint64(uint256(price)), prcieFeed.decimals());
    }
}

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



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

pragma solidity ^0.8.0;

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

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

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



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

pragma solidity ^0.8.0;

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

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

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

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

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

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

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

// File: @chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol



// 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
    );
}