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// SPDX-License-Identifier: MIT
pragma solidity 0.8.10;

import {AggregatorInterface} from "@aave/core-v3/contracts/dependencies/chainlink/AggregatorInterface.sol";
import {AggregatorV3Interface} from "@chainlink/contracts/src/v0.8/shared/interfaces/AggregatorV3Interface.sol";

/// @notice Thrown when ratio aggregator address is zero
error RatioAggregatorZeroAddress();

/// @notice Thrown when base aggregator address is zero
error BaseAggregatorZeroAddress();

/// @notice Thrown when ratio price is less than or equal to zero
error InvalidRatio();

/// @notice Thrown when base price is less than or equal to zero
error InvalidBasePrice();

/// @notice Thrown when oracle data is too old based on maxDelay
/// @param currentTime Current block timestamp
/// @param updatedAt Timestamp when the price was last updated
/// @param maxTime Maximum allowed timestamp (updatedAt + maxDelay)
error PriceTooOld(uint256 currentTime, uint256 updatedAt, uint256 maxTime);

/// @notice Thrown when oracle round is stale or incomplete (answeredInRound < roundId or updatedAt == 0)
error StaleRound();

/// @notice Thrown when oracle decimals exceed maximum allowed value (18)
error InvalidDecimals();

/**
 * @title ChainlinkRatioOracleAggregator
 * @author Neverland
 * @notice Combines two Chainlink price feeds to create a derived price feed
 * @dev Example: earnAUSD/AUSD (ratio) × AUSD/USD (base) = earnAUSD/USD
 */
contract ChainlinkRatioOracleAggregator is AggregatorInterface, AggregatorV3Interface {
    /// @notice The ratio aggregator (e.g., earnAUSD/AUSD exchange rate)
    AggregatorV3Interface public immutable ratioAggregator;

    /// @notice The base price aggregator (e.g., AUSD/USD price feed)
    AggregatorV3Interface public immutable baseAggregator;

    /// @notice Maximum allowed staleness in seconds (0 = disabled)
    uint256 public immutable maxDelay;

    /// @notice Number of decimals for the ratio aggregator
    uint8 public immutable ratioDecimals;

    /// @notice Number of decimals for the base aggregator
    uint8 public immutable baseDecimals;

    /// @dev Target output decimals (Aave standard)
    uint256 private constant TARGET_DECIMALS = 8;

    /**
     * @param _ratioAggregator Address of the ratio aggregator (e.g., earnAUSD/AUSD)
     * @param _baseAggregator Address of the base USD aggregator (e.g., AUSD/USD)
     * @param _maxDelay Maximum allowed staleness in seconds (0 = disabled, not recommended)
     * @dev WARNING: Setting maxDelay=0 disables ALL staleness checks. Use with caution.
     */
    constructor(address _ratioAggregator, address _baseAggregator, uint256 _maxDelay) {
        if (_ratioAggregator == address(0)) revert RatioAggregatorZeroAddress();
        if (_baseAggregator == address(0)) revert BaseAggregatorZeroAddress();

        ratioAggregator = AggregatorV3Interface(_ratioAggregator);
        baseAggregator = AggregatorV3Interface(_baseAggregator);
        maxDelay = _maxDelay;
        ratioDecimals = ratioAggregator.decimals();
        baseDecimals = baseAggregator.decimals();

        // Bound decimals to prevent DoS via excessive exponentiation
        if (ratioDecimals > 18 || baseDecimals > 18) revert InvalidDecimals();
    }

    /**
     * @notice Returns the current derived price (ratio × base)
     * @dev Validates completeness and freshness of both feeds before computation
     * @return The derived price scaled to 8 decimals
     */
    function latestAnswer() external view override returns (int256) {
        (uint80 roundId, int256 ratio,, uint256 ratioUpdatedAt, uint80 answeredInRound) =
            ratioAggregator.latestRoundData();
        if (ratio <= 0) revert InvalidRatio();
        _ensureComplete(ratioUpdatedAt, roundId, answeredInRound);

        (uint80 baseRoundId, int256 basePrice,, uint256 baseUpdatedAt, uint80 baseAnsweredInRound) =
            baseAggregator.latestRoundData();
        if (basePrice <= 0) revert InvalidBasePrice();
        _ensureComplete(baseUpdatedAt, baseRoundId, baseAnsweredInRound);

        return _computePrice(ratio, basePrice);
    }

    /**
     * @notice Returns the most recent update timestamp
     * @dev Returns the older of the two feed timestamps for conservative accuracy
     * @return The timestamp of the oldest recent update
     */
    function latestTimestamp() external view override returns (uint256) {
        (uint80 roundId,,, uint256 ratioUpdatedAt, uint80 answeredInRound) = ratioAggregator.latestRoundData();
        _ensureComplete(ratioUpdatedAt, roundId, answeredInRound);

        (uint80 baseRoundId,,, uint256 baseUpdatedAt, uint80 baseAnsweredInRound) = baseAggregator.latestRoundData();
        _ensureComplete(baseUpdatedAt, baseRoundId, baseAnsweredInRound);

        // Return the older of the two timestamps (most conservative)
        return ratioUpdatedAt < baseUpdatedAt ? ratioUpdatedAt : baseUpdatedAt;
    }

    /**
     * @notice Returns the latest round ID from the ratio feed
     * @return The most recent round ID from the ratio aggregator
     */
    function latestRound() external view override returns (uint256) {
        (uint80 roundId,,,,) = ratioAggregator.latestRoundData();
        return uint256(roundId);
    }

    /**
     * @notice Legacy compatibility function - ONLY supports latest round
     * @dev DEPRECATED: Only works for the current latest round to prevent time-misaligned data.
     *      Historical queries would mix old ratio × current base, producing incorrect results.
     *      For current data: use latestAnswer() instead.
     *      For historical data: this aggregator cannot provide time-accurate historical prices.
     * @param roundId The round ID (must be latest round from ratio aggregator, else returns 0)
     * @return Latest derived price if roundId matches current round, 0 otherwise
     */
    function getAnswer(uint256 roundId) external view override returns (int256) {
        // Only support latest round to prevent historical time-misalignment
        (uint80 latestRoundId,,,,) = ratioAggregator.latestRoundData();

        // Return 0 for any historical round query to prevent misuse
        if (roundId != uint256(latestRoundId)) return 0;

        // For latest round, delegate to latestAnswer with full validation
        try this.latestAnswer() returns (int256 answer) {
            return answer;
        } catch {
            return 0;
        }
    }

    /**
     * @notice Legacy compatibility function - ONLY supports latest round
     * @dev DEPRECATED: Only works for the current latest round to prevent time-misaligned data.
     *      Historical queries would return timestamp from old ratio round but current base state.
     *      For current data: use latestTimestamp() instead.
     *      For historical data: this aggregator cannot provide time-accurate historical timestamps.
     * @param roundId The round ID (must be latest round from ratio aggregator, else returns 0)
     * @return Latest timestamp if roundId matches current round, 0 otherwise
     */
    function getTimestamp(uint256 roundId) external view override returns (uint256) {
        // Only support latest round to prevent historical time-misalignment
        (uint80 latestRoundId,,,,) = ratioAggregator.latestRoundData();

        // Return 0 for any historical round query to prevent misuse
        if (roundId != uint256(latestRoundId)) return 0;

        // For latest round, delegate to latestTimestamp with full validation
        try this.latestTimestamp() returns (uint256 timestamp) {
            return timestamp;
        } catch {
            return 0;
        }
    }

    /**
     * @notice Returns the number of decimals in the derived price
     * @return Always returns 8 (Aave oracle standard)
     */
    function decimals() external pure override returns (uint8) {
        return uint8(TARGET_DECIMALS);
    }

    /**
     * @notice Returns a human-readable description of this aggregator
     * @return Concatenated description: "[ratio description] * [base description]"
     */
    function description() external view override returns (string memory) {
        return string(abi.encodePacked(ratioAggregator.description(), " * ", baseAggregator.description()));
    }

    /**
     * @notice Returns the aggregator version
     * @return Always returns 1
     */
    function version() external pure override returns (uint256) {
        return 1;
    }

    /**
     * @notice Returns the latest round data with derived price
     * @dev Validates completeness and freshness of both feeds
     * @return roundId The round ID from the ratio aggregator
     * @return answer The derived price (ratio × base) scaled to 8 decimals
     * @return startedAt The timestamp when the ratio round started
     * @return updatedAt The conservative timestamp (older of ratio/base updates)
     * @return answeredInRound The round in which the ratio answer was computed
     */
    function latestRoundData()
        external
        view
        override
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
    {
        // Get ratio data
        (roundId, answer, startedAt, updatedAt, answeredInRound) = ratioAggregator.latestRoundData();
        if (answer <= 0) revert InvalidRatio();
        _ensureComplete(updatedAt, roundId, answeredInRound);

        // Get base price data
        (uint80 baseRoundId, int256 basePrice,, uint256 baseUpdatedAt, uint80 baseAnsweredInRound) =
            baseAggregator.latestRoundData();
        if (basePrice <= 0) revert InvalidBasePrice();
        _ensureComplete(baseUpdatedAt, baseRoundId, baseAnsweredInRound);

        // Use the older timestamp (most conservative)
        if (baseUpdatedAt < updatedAt) {
            updatedAt = baseUpdatedAt;
        }

        // Compute final price
        answer = _computePrice(answer, basePrice);
    }

    /**
     * @notice Returns round data - ONLY supports latest round
     * @dev CRITICAL: Only works for the current latest round to prevent time-misaligned data.
     *      Historical queries would produce:
     *      - answer: ratio[old] × basePrice[current] ← INCORRECT time alignment
     *      - updatedAt: mixed timestamp that doesn't represent either feed's state
     *
     *      This would break:
     *      - Time-weighted average price (TWAP) calculations
     *      - Historical price audits and proofs
     *      - Any system requiring time-consistent data
     *
     *      For current data: use latestRoundData() instead.
     *      For historical data: this aggregator CANNOT provide time-accurate historical prices.
     *
     * @param requestedRoundId The round ID (must be latest, else reverts)
     * @return roundId The latest round ID from ratio aggregator
     * @return answer The latest derived price scaled to 8 decimals
     * @return startedAt The timestamp when the latest ratio round started
     * @return updatedAt The conservative timestamp (older of latest ratio/base updates)
     * @return answeredInRound The latest answered in round from ratio aggregator
     */
    function getRoundData(uint80 requestedRoundId)
        external
        view
        override
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
    {
        // Only support latest round to prevent historical time-misalignment
        (uint80 latestRoundId,,,,) = ratioAggregator.latestRoundData();

        // Revert on historical queries to prevent dangerous misuse
        if (requestedRoundId != latestRoundId) revert StaleRound();

        // Delegate to latestRoundData for full validation
        return this.latestRoundData();
    }

    /**
     * @notice Validates round completeness and freshness per Chainlink best practices (reverts on failure)
     * @param updatedAt The timestamp when the round was updated
     * @param roundId The round ID
     * @param answeredInRound The round in which the answer was computed
     */
    function _ensureComplete(uint256 updatedAt, uint80 roundId, uint80 answeredInRound) internal view {
        // Check round is complete: answeredInRound should be >= roundId
        if (answeredInRound < roundId) revert StaleRound();

        // Check round was actually updated (not uninitialized)
        if (updatedAt == 0) revert StaleRound();

        // Check freshness if maxDelay is configured
        if (maxDelay > 0 && updatedAt + maxDelay < block.timestamp) {
            revert PriceTooOld(block.timestamp, updatedAt, updatedAt + maxDelay);
        }
    }

    /**
     * @notice Checks round completeness and freshness (returns false instead of reverting)
     * @dev Used in try-catch compatibility helpers that return 0 on invalid data
     * @param updatedAt The timestamp when the round was updated
     * @param roundId The round ID
     * @param answeredInRound The round in which the answer was computed
     * @return true if round is complete and fresh, false otherwise
     */
    function _isComplete(uint256 updatedAt, uint80 roundId, uint80 answeredInRound) internal view returns (bool) {
        // Check round is complete: answeredInRound should be >= roundId
        if (answeredInRound < roundId) return false;

        // Check round was actually updated (not uninitialized)
        if (updatedAt == 0) return false;

        // Check freshness if maxDelay is configured
        if (maxDelay > 0 && updatedAt + maxDelay < block.timestamp) return false;

        return true;
    }

    /**
     * @notice Computes the final price by multiplying ratio * basePrice
     * @dev Formula: (ratio * basePrice) / 10^ratioDecimals, then scale to TARGET_DECIMALS
     * @param ratio The ratio value (e.g., earnAUSD/AUSD)
     * @param basePrice The base price in USD (e.g., AUSD/USD)
     * @return The final price scaled to TARGET_DECIMALS
     */
    function _computePrice(int256 ratio, int256 basePrice) internal view returns (int256) {
        // Multiply ratio * basePrice, then divide by ratio decimals to get proper scaling
        int256 scaled = (ratio * basePrice) / int256(10 ** ratioDecimals);

        // Adjust to TARGET_DECIMALS based on baseDecimals
        if (baseDecimals > TARGET_DECIMALS) {
            uint256 diff = baseDecimals - TARGET_DECIMALS;
            scaled /= int256(10 ** diff);
        } else if (baseDecimals < TARGET_DECIMALS) {
            uint256 diff = TARGET_DECIMALS - baseDecimals;
            scaled *= int256(10 ** diff);
        }

        return scaled;
    }
}

// SPDX-License-Identifier: MIT
// Chainlink Contracts v0.8
pragma solidity ^0.8.0;

interface AggregatorInterface {
  function latestAnswer() external view returns (int256);

  function latestTimestamp() external view returns (uint256);

  function latestRound() external view returns (uint256);

  function getAnswer(uint256 roundId) external view returns (int256);

  function getTimestamp(uint256 roundId) external view returns (uint256);

  event AnswerUpdated(int256 indexed current, uint256 indexed roundId, uint256 updatedAt);

  event NewRound(uint256 indexed roundId, address indexed startedBy, uint256 startedAt);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// solhint-disable-next-line interface-starts-with-i
interface AggregatorV3Interface {
  function decimals() external view returns (uint8);

  function description() external view returns (string memory);

  function version() external view returns (uint256);

  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);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 100000
  },
  "evmVersion": "berlin",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  }
}

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00000000000000000000000066608681545aaa50d9ebdbd9542feea4e49b85da000000000000000000000000e20751c7b5867bcbef815ffc1b284c3f412a9e130000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _ratioAggregator (address): 0x66608681545aaa50D9ebdBd9542fEeA4e49B85da
Arg [1] : _baseAggregator (address): 0xE20751C7B5867bCBef815ffc1b284c3f412a9e13
Arg [2] : _maxDelay (uint256): 0

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000066608681545aaa50d9ebdbd9542feea4e49b85da
Arg [1] : 000000000000000000000000e20751c7b5867bcbef815ffc1b284c3f412a9e13
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000000