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// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;

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

/**
 * @title Chainlink Wrapper for Tokens Without Direct Feeds
 * @dev This contract wraps a Chainlink AggregatorV3Interface feed, adjusting its price 
 *      using an external rate provider. This is useful for liquid staking tokens (LSTs)
 *      whose prices can be inferred based on their underlying asset.
 */
interface IRateProvider {
    /**
     * @notice Fetches the latest exchange rate from the provider.
     * @return The rate with 18 decimals precision.
     */
    function getRate() external view returns (uint256);
}

contract ChainlinkWrapper is AggregatorV3Interface {
    
    /// @notice The Chainlink price feed used as the base price source.
    AggregatorV3Interface public immutable chainlinkFeed;
    
    /// @notice The rate provider used to adjust the Chainlink price.
    IRateProvider public immutable rateProvider;

    /// @dev Chainlink price feeds typically use 8 decimal places.
    uint8 private constant DECIMALS = 8;

    /// @dev The rate provider returns values with 18 decimal places.
    uint256 private constant RATE_DECIMALS = 18;

    /**
     * @notice Initializes the contract with the Chainlink feed and rate provider.
     * @param _chainlinkFeed Address of the Chainlink AggregatorV3Interface feed.
     * @param _rateProvider Address of the contract providing the adjustment rate.
     */
    constructor(address _chainlinkFeed, address _rateProvider) {
        require(_chainlinkFeed != address(0), "Invalid Chainlink feed address");
        require(_rateProvider != address(0), "Invalid rate provider address");

        chainlinkFeed = AggregatorV3Interface(_chainlinkFeed);
        rateProvider = IRateProvider(_rateProvider);
    }

    /**
     * @notice Returns the number of decimals used by this feed.
     * @return The number of decimals (always 8).
     */
    function decimals() external pure override returns (uint8) {
        return DECIMALS;
    }

    /**
     * @notice Returns the description of the underlying Chainlink feed.
     * @return The description string.
     */
    function description() external view override returns (string memory) {
        return chainlinkFeed.description();
    }

    /**
     * @notice Returns the version of the underlying Chainlink feed.
     * @return The version number.
     */
    function version() external view override returns (uint256) {
        return chainlinkFeed.version();
    }

    /**
     * @notice Fetches historical round data from the Chainlink feed.
     * @param _roundId The round ID to query.
     * @return roundId The round ID.
     * @return answer The price from that round.
     * @return startedAt The timestamp when the round started.
     * @return updatedAt The timestamp when the round was updated.
     * @return answeredInRound The round ID in which the answer was derived.
     */
    function getRoundData(uint80 _roundId) 
        external 
        view 
        override 
        returns (
            uint80 roundId, 
            int256 answer, 
            uint256 startedAt, 
            uint256 updatedAt, 
            uint80 answeredInRound
        ) 
    {
        return chainlinkFeed.getRoundData(_roundId);
    }

    /**
     * @notice Fetches the latest round data, adjusting the price with the rate provider.
     * @return roundId The latest round ID.
     * @return answer The adjusted price after applying the rate.
     * @return startedAt The timestamp when the round started.
     * @return updatedAt The timestamp when the round was updated.
     * @return answeredInRound The round ID in which the answer was derived.
     */
    function latestRoundData() 
        external 
        view 
        override 
        returns (
            uint80 roundId, 
            int256 answer, 
            uint256 startedAt, 
            uint256 updatedAt, 
            uint80 answeredInRound
        ) 
    {
        // Fetch latest Chainlink price data
        (roundId, answer, startedAt, updatedAt, answeredInRound) = chainlinkFeed.latestRoundData();
        require(answer > 0, "Invalid Chainlink price");

        // Fetch rate from the rate provider
        uint256 rate = rateProvider.getRate();
        require(rate > 0, "Invalid rate from provider");

        // Adjust the price by applying the rate, maintaining 8 decimal precision
        answer = (answer * int256(rate)) / int256(10 ** RATE_DECIMALS);

        return (roundId, answer, startedAt, updatedAt, answeredInRound);
    }
}

// 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);

  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
    );
}

{
  "remappings": [
    "@aave/=node_modules/@aave/",
    "@account-abstraction/=node_modules/@account-abstraction/",
    "@chainlink/=node_modules/@chainlink/",
    "@eth-optimism/=node_modules/@chainlink/contracts/node_modules/@eth-optimism/",
    "@openzeppelin/=node_modules/@openzeppelin/",
    "@uniswap/=node_modules/@uniswap/",
    "base64-sol/=node_modules/base64-sol/",
    "ds-test/=lib/ds-test/",
    "eth-gas-reporter/=node_modules/eth-gas-reporter/",
    "forge-std/=lib/forge-std/src/",
    "hardhat/=node_modules/hardhat/",
    "solidity-bytes-utils/=node_modules/solidity-bytes-utils/",
    "erc4626-tests/=lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "solmate/=lib/solmate/src/",
    "abdk-libraries-solidity/=node_modules/abdk-libraries-solidity/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "shanghai",
  "viaIR": true,
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"_chainlinkFeed","type":"address"},{"internalType":"address","name":"_rateProvider","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"chainlinkFeed","outputs":[{"internalType":"contract AggregatorV3Interface","name":"","type":"address"}],"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":"uint80","name":"_roundId","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":[],"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":"rateProvider","outputs":[{"internalType":"contract IRateProvider","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000c76dfb89ff298145b417d221b2c747d84952e01d000000000000000000000000d6f7c8fde1a54367c8389975c4d287d483dedb14

-----Decoded View---------------
Arg [0] : _chainlinkFeed (address): 0xc76dFb89fF298145b417d221B2c747d84952e01d
Arg [1] : _rateProvider (address): 0xd6F7c8fDE1a54367C8389975C4D287D483DEdb14

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000c76dfb89ff298145b417d221b2c747d84952e01d
Arg [1] : 000000000000000000000000d6f7c8fde1a54367c8389975c4d287d483dedb14