// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

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

/**
 * @title MockPriceFeed
 * @notice Mock price feed for testing and development
 * @dev Implements IAggregator interface for Chainlink compatibility
 */
contract MockPriceFeed is IAggregator, Ownable {
    int256 private _latestAnswer;
    uint256 private _latestTimestamp;
    uint8 private _decimals;

    event PriceUpdated(int256 newPrice, uint256 timestamp);

    constructor(int256 initialPrice, uint8 decimals_) Ownable(msg.sender) {
        _latestAnswer = initialPrice;
        _latestTimestamp = block.timestamp;
        _decimals = decimals_;
    }

    /**
     * @notice Update price (owner only)
     * @param newPrice New price value
     */
    function updatePrice(int256 newPrice) external onlyOwner {
        require(newPrice > 0, "MockPriceFeed: price must be positive");
        _latestAnswer = newPrice;
        _latestTimestamp = block.timestamp;
        emit PriceUpdated(newPrice, block.timestamp);
    }

    /**
     * @notice Update price with custom timestamp
     * @param newPrice New price value
     * @param timestamp Custom timestamp
     */
    function updatePriceWithTimestamp(int256 newPrice, uint256 timestamp) external onlyOwner {
        require(newPrice > 0, "MockPriceFeed: price must be positive");
        require(timestamp <= block.timestamp, "MockPriceFeed: future timestamp");
        _latestAnswer = newPrice;
        _latestTimestamp = timestamp;
        emit PriceUpdated(newPrice, timestamp);
    }

    /**
     * @notice Get latest answer
     * @return answer Latest price answer
     */
    function latestAnswer() external view override returns (int256) {
        return _latestAnswer;
    }

    /**
     * @notice Get latest timestamp
     * @return timestamp Latest price timestamp
     */
    function latestTimestamp() external view returns (uint256) {
        return _latestTimestamp;
    }

    /**
     * @notice Get decimals
     * @return decimals Number of decimals
     */
    function decimals() external view override returns (uint8) {
        return _decimals;
    }

    /**
     * @notice Get latest round data
     * @return roundId Round ID (mock: always 1)
     * @return answer Latest price answer
     * @return startedAt Start timestamp (mock: same as latestTimestamp)
     * @return updatedAt Latest timestamp
     * @return answeredInRound Round ID (mock: always 1)
     */
    function latestRoundData() external view override returns (
        uint80 roundId,
        int256 answer,
        uint256 startedAt,
        uint256 updatedAt,
        uint80 answeredInRound
    ) {
        return (
            1,
            _latestAnswer,
            _latestTimestamp,
            _latestTimestamp,
            1
        );
    }

    /**
     * @notice Get round data (mock: always returns latest)
     * @param roundId Round ID (ignored in mock)
     * @return roundId Round ID
     * @return answer Latest price answer
     * @return startedAt Start timestamp
     * @return updatedAt Latest timestamp
     * @return answeredInRound Round ID
     */
    function getRoundData(uint80 roundId) external view override returns (
        uint80,
        int256 answer,
        uint256 startedAt,
        uint256 updatedAt,
        uint80 answeredInRound
    ) {
        return (
            roundId,
            _latestAnswer,
            _latestTimestamp,
            _latestTimestamp,
            roundId
        );
    }

    /**
     * @notice Get description
     * @return description Price feed description
     */
    function description() external pure override returns (string memory) {
        return "Mock Price Feed";
    }

    /**
     * @notice Update answer (for testing)
     * @param answer New answer value
     */
    function updateAnswer(uint256 answer) external override onlyOwner {
        require(answer > 0, "MockPriceFeed: answer must be positive");
        _latestAnswer = int256(answer);
        _latestTimestamp = block.timestamp;
        emit PriceUpdated(int256(answer), block.timestamp);
    }

    /**
     * @notice Get version
     * @return version Version number
     */
    function version() external pure override returns (uint256) {
        return 1;
    }
}