pragma solidity >=0.5.0 <0.6.0;

import "./PriceFeeds.sol";
import "./IRSKOracle.sol";
import "../openzeppelin/Ownable.sol";
import "../openzeppelin/Address.sol";

/**
 * @notice The Price Feed RSK Oracle contract.
 *
 * This contract implements RSK Oracle query functionality,
 * getting the price and the last timestamp from an external oracle contract.
 * */
contract PriceFeedRSKOracle is IPriceFeedsExt, Ownable {
	/* Storage */

	address public rskOracleAddress;

	/* Events */

	event SetRSKOracleAddress(address indexed rskOracleAddress, address changerAddress);

	/* Functions */

	/**
	 * @notice Initialize a new RSK Oracle.
	 *
	 * @param _rskOracleAddress The RSK Oracle address.
	 * */
	constructor(address _rskOracleAddress) public {
		setRSKOracleAddress(_rskOracleAddress);
	}

	/**
	 * @notice Get the oracle price.
	 * @return The price from Oracle.
	 * */
	function latestAnswer() external view returns (uint256 _price) {
		IRSKOracle _rskOracle = IRSKOracle(rskOracleAddress);
		(_price, ) = _rskOracle.getPricing();
	}

	/**
	 * @notice Get the las time oracle updated the price.
	 * @return The latest time.
	 */
	function latestTimestamp() external view returns (uint256 _timestamp) {
		IRSKOracle _rskOracle = IRSKOracle(rskOracleAddress);
		(, _timestamp) = _rskOracle.getPricing();
	}

	/**
	 * @notice Set the RSK Oracle address.
	 *
	 * @param _rskOracleAddress The RSK Oracle address.
	 */
	function setRSKOracleAddress(address _rskOracleAddress) public onlyOwner {
		require(Address.isContract(_rskOracleAddress), "_rskOracleAddress not a contract");
		rskOracleAddress = _rskOracleAddress;
		emit SetRSKOracleAddress(rskOracleAddress, msg.sender);
	}
}