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// SPDX-License-Identifier: MIT
/* ———————————————————————————————————————————————————————————————————————————————— *
 *    _____     ______   ______     __     __   __     __     ______   __  __       *
 *   /\  __-.  /\__  _\ /\  == \   /\ \   /\ "-.\ \   /\ \   /\__  _\ /\ \_\ \      *
 *   \ \ \/\ \ \/_/\ \/ \ \  __<   \ \ \  \ \ \-.  \  \ \ \  \/_/\ \/ \ \____ \     *
 *    \ \____-    \ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\  \ \_\    \ \_\  \/\_____\    *
 *     \/____/     \/_/   \/_/ /_/   \/_/   \/_/ \/_/   \/_/     \/_/   \/_____/    *
 *                                                                                  *
 * ————————————————————————————————— dtrinity.org ————————————————————————————————— *
 *                                                                                  *
 *                                         ▲                                        *
 *                                        ▲ ▲                                       *
 *                                                                                  *
 * ———————————————————————————————————————————————————————————————————————————————— *
 * dTRINITY Protocol: https://github.com/dtrinity                                   *
 * ———————————————————————————————————————————————————————————————————————————————— */

pragma solidity ^0.8.20;

import "../interface/chainlink/IAggregatorV3Interface.sol";
import "../interface/chainlink/IPriceFeedLegacy.sol";

/**
 * @title ChainlinkDecimalDownscaler
 * @notice Dedicated downscaler for Chainlink price feeds - reduces decimal precision
 * @dev Implements both AggregatorV3Interface and IPriceFeedLegacy for backwards compatibility
 * @dev This contract is optimized for gas efficiency by only supporting downscaling operations
 */
contract ChainlinkDecimalDownscaler is AggregatorV3Interface, IPriceFeedLegacy {
  /// @notice Original Chainlink price feed
  AggregatorV3Interface public immutable sourceFeed;

  /// @notice Legacy interface for the source feed (if supported)
  IPriceFeedLegacy private immutable sourceFeedLegacy;

  /// @notice Original decimals from the source feed
  uint8 public immutable sourceDecimals;

  /// @notice Target decimals for price conversion
  uint8 public immutable override decimals;

  /// @notice Scaling factor to convert between source and target decimals
  int256 private immutable scalingFactor;

  /**
   * @notice Error thrown when target decimals exceed source decimals
   */
  error InvalidDecimalsUpscaleNotSupported();

  /**
   * @notice Constructor to initialize the downscaling decimal converter
   * @param _sourceFeed Address of the source Chainlink price feed
   * @param _targetDecimals Target decimal precision (must be less than or equal to source decimals)
   */
  constructor(address _sourceFeed, uint8 _targetDecimals) {
    sourceFeed = AggregatorV3Interface(_sourceFeed);
    sourceFeedLegacy = IPriceFeedLegacy(_sourceFeed);
    sourceDecimals = sourceFeed.decimals();
    decimals = _targetDecimals;

    // We only support downscaling (reducing precision), not upscaling
    if (_targetDecimals > sourceDecimals) {
      revert InvalidDecimalsUpscaleNotSupported();
    }

    // Calculate the scaling factor to convert from source to target decimals
    // For downscaling, we divide by 10^(sourceDecimals - targetDecimals)
    uint8 decimalDifference = sourceDecimals - _targetDecimals;
    scalingFactor = int256(10 ** decimalDifference);
  }

  /**
   * @notice Returns the description of the original feed
   * @return Description string
   */
  function description() external view override returns (string memory) {
    return sourceFeed.description();
  }

  /**
   * @notice Returns the version of the original feed
   * @return Version number
   */
  function version() external view override returns (uint256) {
    return sourceFeed.version();
  }

  /**
   * @notice Gets data for a specific round
   * @param _roundId The round ID to retrieve data for
   * @return roundId The round ID
   * @return answer The price with adjusted decimals
   * @return startedAt The timestamp when the round started
   * @return updatedAt The timestamp when the round was updated
   * @return answeredInRound The round in which the answer was computed
   */
  function getRoundData(
    uint80 _roundId
  ) external view override returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound) {
    (roundId, answer, startedAt, updatedAt, answeredInRound) = sourceFeed.getRoundData(_roundId);
    answer = answer / scalingFactor;
  }

  /**
   * @notice Gets data for the latest round
   * @return roundId The round ID
   * @return answer The price with adjusted decimals
   * @return startedAt The timestamp when the round started
   * @return updatedAt The timestamp when the round was updated
   * @return answeredInRound The round in which the answer was computed
   */
  function latestRoundData()
    external
    view
    override
    returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
  {
    (roundId, answer, startedAt, updatedAt, answeredInRound) = sourceFeed.latestRoundData();
    answer = answer / scalingFactor;
  }

  /**
   * @notice Legacy function: Gets the number of latest round
   * @return latestRound The number of the latest update round
   */
  function latestRound() external view override returns (uint80) {
    try sourceFeedLegacy.latestRound() returns (uint80 roundId) {
      return roundId;
    } catch {
      // Fall back to getting it from latestRoundData if legacy interface not supported
      (uint80 roundId, , , , ) = sourceFeed.latestRoundData();
      return roundId;
    }
  }

  /**
   * @notice Legacy function: Gets the latest successfully reported value with adjusted decimals
   * @return latestAnswer The latest successfully reported value with target decimals
   */
  function latestAnswer() external view override returns (int256) {
    try sourceFeedLegacy.latestAnswer() returns (int256 answer) {
      return answer / scalingFactor;
    } catch {
      // Fall back to getting it from latestRoundData if legacy interface not supported
      (, int256 answer, , , ) = sourceFeed.latestRoundData();
      return answer / scalingFactor;
    }
  }
}

// SPDX-License-Identifier: MIT
/* ———————————————————————————————————————————————————————————————————————————————— *
 *    _____     ______   ______     __     __   __     __     ______   __  __       *
 *   /\  __-.  /\__  _\ /\  == \   /\ \   /\ "-.\ \   /\ \   /\__  _\ /\ \_\ \      *
 *   \ \ \/\ \ \/_/\ \/ \ \  __<   \ \ \  \ \ \-.  \  \ \ \  \/_/\ \/ \ \____ \     *
 *    \ \____-    \ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\  \ \_\    \ \_\  \/\_____\    *
 *     \/____/     \/_/   \/_/ /_/   \/_/   \/_/ \/_/   \/_/     \/_/   \/_____/    *
 *                                                                                  *
 * ————————————————————————————————— dtrinity.org ————————————————————————————————— *
 *                                                                                  *
 *                                         ▲                                        *
 *                                        ▲ ▲                                       *
 *                                                                                  *
 * ———————————————————————————————————————————————————————————————————————————————— *
 * dTRINITY Protocol: https://github.com/dtrinity                                   *
 * ———————————————————————————————————————————————————————————————————————————————— */

pragma solidity ^0.8.20;

interface AggregatorV3Interface {
  function decimals() external view returns (uint8);

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

  function version() external view returns (uint256);

  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  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);
}

// SPDX-License-Identifier: MIT
/* ———————————————————————————————————————————————————————————————————————————————— *
 *    _____     ______   ______     __     __   __     __     ______   __  __       *
 *   /\  __-.  /\__  _\ /\  == \   /\ \   /\ "-.\ \   /\ \   /\__  _\ /\ \_\ \      *
 *   \ \ \/\ \ \/_/\ \/ \ \  __<   \ \ \  \ \ \-.  \  \ \ \  \/_/\ \/ \ \____ \     *
 *    \ \____-    \ \_\  \ \_\ \_\  \ \_\  \ \_\\"\_\  \ \_\    \ \_\  \/\_____\    *
 *     \/____/     \/_/   \/_/ /_/   \/_/   \/_/ \/_/   \/_/     \/_/   \/_____/    *
 *                                                                                  *
 * ————————————————————————————————— dtrinity.org ————————————————————————————————— *
 *                                                                                  *
 *                                         ▲                                        *
 *                                        ▲ ▲                                       *
 *                                                                                  *
 * ———————————————————————————————————————————————————————————————————————————————— *
 * dTRINITY Protocol: https://github.com/dtrinity                                   *
 * ———————————————————————————————————————————————————————————————————————————————— */

pragma solidity ^0.8.20;

/**
 * @title IPriceFeedLegacy
 * @notice Legacy Chainlink price feed interface for backwards compatibility
 * @dev Some older Chainlink feeds may only support these legacy functions
 */
interface IPriceFeedLegacy {
  /**
   * @notice Get the number of the latest update round
   * @return The number of the latest update round
   */
  function latestRound() external view returns (uint80);

  /**
   * @notice Get the latest successfully reported value
   * @return The latest successfully reported value
   */
  function latestAnswer() external view returns (int256);
}

{
  "evmVersion": "paris",
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[{"inputs":[{"internalType":"address","name":"_sourceFeed","type":"address"},{"internalType":"uint8","name":"_targetDecimals","type":"uint8"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"InvalidDecimalsUpscaleNotSupported","type":"error"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","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":"latestAnswer","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"latestRound","outputs":[{"internalType":"uint80","name":"","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":"sourceDecimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"sourceFeed","outputs":[{"internalType":"contract AggregatorV3Interface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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000000000000000000000000daa62952076b407accf30c196c48db83f8dff3750000000000000000000000000000000000000000000000000000000000000008

-----Decoded View---------------
Arg [0] : _sourceFeed (address): 0xDaa62952076b407ACCf30c196C48DB83F8dff375
Arg [1] : _targetDecimals (uint8): 8

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000daa62952076b407accf30c196c48db83f8dff375
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000008