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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import {IChainlinkAggregator} from '../interfaces/IChainlinkAggregator.sol';
import {ICLSynchronicityPriceAdapter} from '../interfaces/ICLSynchronicityPriceAdapter.sol';

/**
 * @title CLSynchronicityPriceAdapterBaseToPeg
 * @author BGD Labs
 * @notice Price adapter to calculate price of (Asset / Base) pair by using
 * @notice Chainlink Data Feeds for (Asset / Peg) and (Base / Peg) pairs.
 * @notice For example it can be used to calculate USDC / ETH
 * @notice based on USDC / USD and ETH / USD feeds.
 */
contract CLSynchronicityPriceAdapterBaseToPeg is ICLSynchronicityPriceAdapter {
  /**
   * @notice Price feed for (Base / Peg) pair
   */
  IChainlinkAggregator public immutable BASE_TO_PEG;

  /**
   * @notice Price feed for (Asset / Peg) pair
   */
  IChainlinkAggregator public immutable ASSET_TO_PEG;

  /**
   * @notice Number of decimals in the output of this price adapter
   */
  uint8 public immutable DECIMALS;

  /**
   * @notice Maximum number of resulting and feed decimals
   */
  uint8 public constant MAX_DECIMALS = 18;

  string private _description;

  /**
   * @param baseToPegAggregatorAddress the address of BASE / PEG feed
   * @param assetToPegAggregatorAddress the address of the ASSET / PEG feed
   * @param decimals precision of the answer
   * @param pairDescription description
   */
  constructor(
    address baseToPegAggregatorAddress,
    address assetToPegAggregatorAddress,
    uint8 decimals,
    string memory pairDescription
  ) {
    BASE_TO_PEG = IChainlinkAggregator(baseToPegAggregatorAddress);
    ASSET_TO_PEG = IChainlinkAggregator(assetToPegAggregatorAddress);

    if (decimals > MAX_DECIMALS) revert DecimalsAboveLimit();
    if (BASE_TO_PEG.decimals() > MAX_DECIMALS) revert DecimalsAboveLimit();

    if (BASE_TO_PEG.decimals() != ASSET_TO_PEG.decimals()) revert DecimalsNotEqual();

    DECIMALS = decimals;
    _description = pairDescription;
  }

  /// @inheritdoc ICLSynchronicityPriceAdapter
  function description() external view returns (string memory) {
    return _description;
  }

  /// @inheritdoc ICLSynchronicityPriceAdapter
  function decimals() external view returns (uint8) {
    return DECIMALS;
  }

  /// @inheritdoc ICLSynchronicityPriceAdapter
  function latestAnswer() external view override returns (int256) {
    int256 assetToPegPrice = ASSET_TO_PEG.latestAnswer();
    int256 baseToPegPrice = BASE_TO_PEG.latestAnswer();

    if (assetToPegPrice <= 0 || baseToPegPrice <= 0) {
      return 0;
    }

    return (assetToPegPrice * int256(10 ** DECIMALS)) / (baseToPegPrice);
  }
}

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

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

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

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

interface ICLSynchronicityPriceAdapter {
  /**
   * @notice Calculates the current answer based on the aggregators.
   * @return int256 latestAnswer
   */
  function latestAnswer() external view returns (int256);

  /**
   * @notice Returns the description of the feed
   * @return string desciption
   */
  function description() external view returns (string memory);

  /**
   * @notice Returns the feed decimals
   * @return uint8 decimals
   */
  function decimals() external view returns (uint8);

  error DecimalsAboveLimit();
  error DecimalsNotEqual();
  error RatioOutOfBounds();
}

{
  "remappings": [
    "forge-std/=lib/forge-std/src/",
    "aave-address-book/=lib/aave-address-book/src/",
    "cl-synchronicity-price-adapter/=lib/cl-synchronicity-price-adapter/src/",
    "aave-v3-core/=lib/aave-address-book/lib/aave-v3-core/",
    "aave-helpers/=lib/aave-helpers/src/",
    "solidity-utils/=lib/aave-helpers/lib/solidity-utils/src/",
    "@aave/core-v3/=lib/aave-address-book/lib/aave-v3-core/",
    "@aave/periphery-v3/=lib/aave-address-book/lib/aave-v3-periphery/",
    "aave-v3-periphery/=lib/aave-address-book/lib/aave-v3-periphery/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "governance-crosschain-bridges/=lib/aave-helpers/lib/governance-crosschain-bridges/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": false,
  "libraries": {}
}

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[{"inputs":[{"internalType":"address","name":"baseToPegAggregatorAddress","type":"address"},{"internalType":"address","name":"assetToPegAggregatorAddress","type":"address"},{"internalType":"uint8","name":"decimals","type":"uint8"},{"internalType":"string","name":"pairDescription","type":"string"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"DecimalsAboveLimit","type":"error"},{"inputs":[],"name":"DecimalsNotEqual","type":"error"},{"inputs":[],"name":"RatioOutOfBounds","type":"error"},{"inputs":[],"name":"ASSET_TO_PEG","outputs":[{"internalType":"contract IChainlinkAggregator","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"BASE_TO_PEG","outputs":[{"internalType":"contract IChainlinkAggregator","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"DECIMALS","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_DECIMALS","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"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":[],"name":"latestAnswer","outputs":[{"internalType":"int256","name":"","type":"int256"}],"stateMutability":"view","type":"function"}]

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