// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import {IAggregatorV3Like} from "./interfaces/IPluginFeed.sol";

/// @title ChainlinkScaledAdapter
/// @notice Optional wrapper: rescales a (checked) AggregatorV3-like source to 8 decimals
///         for consumers that hard-code the Chainlink 8-dp convention.
contract ChainlinkScaledAdapter is IAggregatorV3Like {
    uint8 public constant DECIMALS = 8;
    IAggregatorV3Like public immutable source;
    uint8 public immutable sourceDecimals;

    error PrecisionLoss(int256 answer);
    error BadSource();

    constructor(IAggregatorV3Like _source) {
        source = _source;
        sourceDecimals = _source.decimals();
        if (sourceDecimals > 36) revert BadSource();
    }

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

    function description() external view returns (string memory) {
        return source.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) = source.latestRoundData();
        if (sourceDecimals > DECIMALS) {
            answer = answer / int256(10 ** (sourceDecimals - DECIMALS));
            if (answer == 0) revert PrecisionLoss(answer);
        } else if (sourceDecimals < DECIMALS) {
            answer = answer * int256(10 ** (DECIMALS - sourceDecimals));
        }
    }
}