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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 {IRedstoneAggregator, RedstoneAggregatorZeroAddress, PriceTooOld} from "./interfaces/IRedstoneAggregator.sol";

error BaseAggregatorZeroAddress();
error InvalidRatio();
error InvalidBasePrice();

interface IAggregatorWithDecimals is AggregatorInterface {
    function decimals() external view returns (uint8);
}

contract RedstoneRatioOracleAggregator {
    IRedstoneAggregator public immutable ratioAggregator;
    IAggregatorWithDecimals public immutable baseAggregator;
    uint256 public immutable maxDelay;
    uint8 public immutable ratioDecimals;
    uint8 public immutable baseDecimals;

    uint256 private constant TARGET_DECIMALS = 8;

    constructor(address _ratioAggregator, address _baseAggregator, uint256 _maxDelay) {
        if (_ratioAggregator == address(0)) revert RedstoneAggregatorZeroAddress();
        if (_baseAggregator == address(0)) revert BaseAggregatorZeroAddress();

        ratioAggregator = IRedstoneAggregator(_ratioAggregator);
        baseAggregator = IAggregatorWithDecimals(_baseAggregator);
        maxDelay = _maxDelay;
        ratioDecimals = ratioAggregator.decimals();
        baseDecimals = baseAggregator.decimals();
    }

    function latestAnswer() external view returns (int256) {
        (, int256 ratio,, uint256 ratioUpdatedAt,) = ratioAggregator.latestRoundData();
        if (ratio <= 0) revert InvalidRatio();
        _ensureFresh(ratioUpdatedAt);

        (int256 basePrice, uint256 baseTimestamp) = _getBasePrice();
        if (baseTimestamp != 0) {
            _ensureFresh(baseTimestamp);
        }

        return _computePrice(ratio, basePrice);
    }

    function latestTimestamp() external view returns (uint256) {
        (,,, uint256 ratioUpdatedAt,) = ratioAggregator.latestRoundData();
        _ensureFresh(ratioUpdatedAt);
        (, uint256 baseTimestamp) = _getBasePrice();
        if (baseTimestamp != 0) {
            _ensureFresh(baseTimestamp);
            return ratioUpdatedAt < baseTimestamp ? ratioUpdatedAt : baseTimestamp;
        }
        return ratioUpdatedAt;
    }

    function latestRound() external view returns (uint256) {
        (uint80 roundId,,,,) = ratioAggregator.latestRoundData();
        return uint256(roundId);
    }

    function getAnswer(uint256 roundId) external view returns (int256) {
        try ratioAggregator.getRoundData(uint80(roundId)) returns (
            uint80, int256 ratio, uint256, uint256 updatedAt, uint80
        ) {
            if (ratio <= 0) return 0;
            if (!_isFresh(updatedAt)) return 0;

            (int256 basePrice, uint256 baseTimestamp) = _getBasePrice();
            if (baseTimestamp != 0 && !_isFresh(baseTimestamp)) return 0;

            return _computePrice(ratio, basePrice);
        } catch {
            return 0;
        }
    }

    function getTimestamp(uint256 roundId) external view returns (uint256) {
        try ratioAggregator.getRoundData(uint80(roundId)) returns (uint80, int256, uint256, uint256 updatedAt, uint80) {
            if (!_isFresh(updatedAt)) return 0;
            (, uint256 baseTimestamp) = _getBasePrice();
            if (baseTimestamp != 0 && !_isFresh(baseTimestamp)) return 0;
            return (baseTimestamp != 0 && baseTimestamp < updatedAt) ? baseTimestamp : updatedAt;
        } catch {
            return 0;
        }
    }

    function decimals() external pure returns (uint8) {
        return uint8(TARGET_DECIMALS);
    }

    function description() external view returns (string memory) {
        return ratioAggregator.description();
    }

    function version() external pure returns (uint256) {
        return 1;
    }

    function latestRoundData()
        external
        view
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
    {
        (roundId, answer, startedAt, updatedAt, answeredInRound) = ratioAggregator.latestRoundData();
        if (answer <= 0) revert InvalidRatio();
        _ensureFresh(updatedAt);

        (int256 basePrice, uint256 baseTimestamp) = _getBasePrice();
        if (baseTimestamp != 0) {
            _ensureFresh(baseTimestamp);
            if (baseTimestamp < updatedAt) {
                updatedAt = baseTimestamp;
            }
        }
        answer = _computePrice(answer, basePrice);
    }

    function getRoundData(uint80 requestedRoundId)
        external
        view
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
    {
        (roundId, answer, startedAt, updatedAt, answeredInRound) = ratioAggregator.getRoundData(requestedRoundId);
        if (answer <= 0) revert InvalidRatio();
        _ensureFresh(updatedAt);

        (int256 basePrice, uint256 baseTimestamp) = _getBasePrice();
        if (baseTimestamp != 0) {
            _ensureFresh(baseTimestamp);
            if (baseTimestamp < updatedAt) {
                updatedAt = baseTimestamp;
            }
        }
        answer = _computePrice(answer, basePrice);
    }

    function _ensureFresh(uint256 updatedAt) internal view {
        if (!_isFresh(updatedAt)) revert PriceTooOld(block.timestamp, updatedAt, updatedAt + maxDelay);
    }

    function _isFresh(uint256 updatedAt) internal view returns (bool) {
        if (maxDelay == 0) return true;
        if (updatedAt == 0) return false;
        return updatedAt + maxDelay >= block.timestamp;
    }

    function _computePrice(int256 ratio, int256 basePrice) internal view returns (int256) {
        int256 scaled = (ratio * basePrice) / int256(10 ** ratioDecimals);

        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;
    }

    function _getBasePrice() internal view returns (int256 price, uint256 timestamp) {
        price = baseAggregator.latestAnswer();
        if (price <= 0) revert InvalidBasePrice();
        try baseAggregator.latestTimestamp() returns (uint256 ts) {
            timestamp = ts;
        } catch {
            timestamp = 0;
        }
    }
}

// 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 0.8.10;

error RedstoneAggregatorZeroAddress();
error PriceTooOld(uint256 blockTimestamp, uint256 priceTimestamp, uint256 maxTimestamp);

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

    function latestRoundData()
        external
        view
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound);

    function getRoundData(uint80 requestedRoundId)
        external
        view
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound);

    function latestRound() external view returns (uint80);

    function decimals() external pure returns (uint8);

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

    function version() external pure returns (uint256);
}

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

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[{"inputs":[{"internalType":"address","name":"_ratioAggregator","type":"address"},{"internalType":"address","name":"_baseAggregator","type":"address"},{"internalType":"uint256","name":"_maxDelay","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"BaseAggregatorZeroAddress","type":"error"},{"inputs":[],"name":"InvalidBasePrice","type":"error"},{"inputs":[],"name":"InvalidRatio","type":"error"},{"inputs":[{"internalType":"uint256","name":"blockTimestamp","type":"uint256"},{"internalType":"uint256","name":"priceTimestamp","type":"uint256"},{"internalType":"uint256","name":"maxTimestamp","type":"uint256"}],"name":"PriceTooOld","type":"error"},{"inputs":[],"name":"RedstoneAggregatorZeroAddress","type":"error"},{"inputs":[],"name":"baseAggregator","outputs":[{"internalType":"contract IAggregatorWithDecimals","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"baseDecimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"description","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"roundId","type":"uint256"}],"name":"getAnswer","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint80","name":"requestedRoundId","type":"uint80"}],"name":"getRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"roundId","type":"uint256"}],"name":"getTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestAnswer","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRound","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxDelay","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ratioAggregator","outputs":[{"internalType":"contract IRedstoneAggregator","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ratioDecimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"}]

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0000000000000000000000008c9f39f0d08ee284a4fe0198524fe7c28630ceab0000000000000000000000001c9582e87ed6e99bc23ec0e6eb52ee9d7c0d6bcd0000000000000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _ratioAggregator (address): 0x8C9f39f0D08EE284a4Fe0198524fE7C28630CEAb
Arg [1] : _baseAggregator (address): 0x1C9582E87eD6E99bc23EC0e6Eb52eE9d7C0D6bcd
Arg [2] : _maxDelay (uint256): 0

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000008c9f39f0d08ee284a4fe0198524fe7c28630ceab
Arg [1] : 0000000000000000000000001c9582e87ed6e99bc23ec0e6eb52ee9d7c0d6bcd
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000000