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// SPDX-License-Identifier: GPL-3.0-only

pragma solidity ^0.8.18;

import "../../interfaces/IPriceFeedOracle.sol";

contract PriceFeedOracle is IPriceFeedOracle {

  mapping(address => AssetInfo) public assetsMap;

  address public constant ETH = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE;
  address public immutable safeTracker;

  constructor(
    address[] memory _assetAddresses,
    address[] memory _assetAggregators,
    AggregatorType[] memory _aggregatorTypes,
    uint8[] memory _assetDecimals,
    address _safeTracker
  ) {
    if (_assetAddresses.length == 0) {
      revert EmptyAssetAddresses();
    }
    if (
      _assetAddresses.length != _assetAggregators.length ||
      _assetAggregators.length != _aggregatorTypes.length ||
      _aggregatorTypes.length != _assetDecimals.length
    ) {
      revert ArgumentLengthMismatch(
        _assetAddresses.length,
        _assetAggregators.length,
        _aggregatorTypes.length,
        _assetDecimals.length
      );
    }
    if (_safeTracker == address(0)) {
      revert ZeroAddress("safeTracker");
    }

    safeTracker = _safeTracker;
    assetsMap[_safeTracker] = AssetInfo(Aggregator(_safeTracker), AggregatorType.ETH, 18);

    for (uint i = 0; i < _assetAddresses.length; i++) {
      if (_assetAddresses[i] == address(0)) {
        revert ZeroAddress("assetAddress");
      }
      if (_assetAggregators[i] == address(0)) {
        revert ZeroAddress("aggregator");
      }
      if (_assetDecimals[i] == 0) {
        revert ZeroDecimals(_assetAddresses[i]);
      }

      Aggregator aggregator = Aggregator(_assetAggregators[i]);
      uint8 aggregatorDecimals = aggregator.decimals();

      if (_aggregatorTypes[i] == AggregatorType.ETH && aggregatorDecimals != 18) {
          revert IncompatibleAggregatorDecimals(_assetAggregators[i], aggregatorDecimals, 18);
      }
      if (_aggregatorTypes[i] == AggregatorType.USD && aggregatorDecimals != 8) {
          revert IncompatibleAggregatorDecimals(_assetAggregators[i], aggregatorDecimals, 8);
      }

      assetsMap[_assetAddresses[i]] = AssetInfo(aggregator, _aggregatorTypes[i], _assetDecimals[i]);
    }

    // Require ETH-USD asset
    AssetInfo memory ethAsset = assetsMap[ETH];
    if (address(ethAsset.aggregator) == address(0)) {
      revert EthUsdAggregatorNotSet();
    }
    if (ethAsset.aggregatorType != AggregatorType.USD) {
      revert InvalidEthAggregatorType(ethAsset.aggregatorType, AggregatorType.USD);
    }
  }

  /// @notice Returns the amount of ether in wei that are equivalent to 1 unit (10 ** decimals) of asset
  /// @param assetAddress address of asset
  /// @return price in ether
  function getAssetToEthRate(address assetAddress) public view returns (uint) {
    if (assetAddress == ETH || assetAddress == safeTracker) {
      return 1 ether;
    }

    AssetInfo memory asset = assetsMap[assetAddress];
    return _getAssetToEthRate(asset.aggregator, asset.aggregatorType);
  }

  /// @notice Returns the amount of currency that is equivalent to ethIn amount of ether.
  /// @param assetAddress address of asset
  /// @param ethIn amount of ether to be converted to the asset
  /// @return asset amount
  function getAssetForEth(address assetAddress, uint ethIn) external view returns (uint) {
    if (assetAddress == ETH || assetAddress == safeTracker) {
      return ethIn;
    }

    AssetInfo memory asset = assetsMap[assetAddress];
    uint price = _getAssetToEthRate(asset.aggregator, asset.aggregatorType);

    return ethIn * (10 ** uint(asset.decimals)) / price;
  }

  /// @notice Returns the amount of eth that is equivalent to a given asset and amount
  /// @param assetAddress address of asset
  /// @param amount amount of asset
  /// @return amount of ether
  function getEthForAsset(address assetAddress, uint amount) external view returns (uint) {
    if (assetAddress == ETH || assetAddress == safeTracker) {
      return amount;
    }

    AssetInfo memory asset = assetsMap[assetAddress];
    uint price = _getAssetToEthRate(asset.aggregator, asset.aggregatorType);

    return amount * (price) / 10 ** uint(asset.decimals);
  }

  /// @notice Returns the amount of ether in wei that are equivalent to 1 unit (10 ** decimals) of asset
  /// @param aggregator The asset aggregator
  /// @param aggregatorType The asset aggregator type (i.e ETH, USD)
  /// @return price in ether
  function _getAssetToEthRate(Aggregator aggregator, AggregatorType aggregatorType) internal view returns (uint) {
    // NOTE: Current implementation relies on off-chain staleness checks, consider adding on-chain staleness check?
    int rate = aggregator.latestAnswer();
    if (rate <= 0) {
      revert NonPositiveRate(address(aggregator), rate);
    }

    if (aggregatorType == AggregatorType.ETH) {
      return uint(rate);
    }

    // AggregatorType.USD - convert the USD rate to its equivalent ETH rate using the ETH-USD exchange rate
    AssetInfo memory ethAsset = assetsMap[ETH];

    int ethUsdRate = ethAsset.aggregator.latestAnswer();
    if (ethUsdRate <= 0) {
      revert NonPositiveRate(ETH, ethUsdRate);
    }

    return (uint(rate) * 1e18) / uint(ethUsdRate);
  }

  /// @notice Retrieves the aggregator and decimals for a specific asset
  /// @param assetAddress address of the asset
  /// @return Aggregator instance and decimals of the asset
  function assets(address assetAddress) external view returns (Aggregator, uint8) {
    AssetInfo memory asset = assetsMap[assetAddress];
    return (asset.aggregator, asset.decimals);
  }
}

// SPDX-License-Identifier: GPL-3.0-only

pragma solidity >=0.5.0;

interface Aggregator {
  function decimals() external view returns (uint8);
  function latestAnswer() external view returns (int);
}

interface IPriceFeedOracle {

  enum AggregatorType { ETH, USD }

  struct AssetInfo {
    Aggregator aggregator;
    AggregatorType aggregatorType;
    uint8 decimals;
  }

  function ETH() external view returns (address);
  function assets(address) external view returns (Aggregator, uint8);
  function assetsMap(address) external view returns (Aggregator, AggregatorType, uint8);

  function getAssetToEthRate(address asset) external view returns (uint);
  function getAssetForEth(address asset, uint ethIn) external view returns (uint);
  function getEthForAsset(address asset, uint amount) external view returns (uint);

  /* ========== ERRORS ========== */

  error EmptyAssetAddresses();
  error ArgumentLengthMismatch(uint assetAddressesLength, uint aggregatorsLength, uint typesLength, uint decimalsLength);
  error ZeroAddress(string parameter);
  error ZeroDecimals(address asset);
  error IncompatibleAggregatorDecimals(address aggregator, uint8 aggregatorDecimals, uint8 expectedDecimals);
  error UnknownAggregatorType(uint8 aggregatorType);
  error EthUsdAggregatorNotSet();
  error InvalidEthAggregatorType(AggregatorType actual, AggregatorType expected);
  error UnknownAsset(address asset);
  error NonPositiveRate(address aggregator, int rate);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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[{"inputs":[{"internalType":"address[]","name":"_assetAddresses","type":"address[]"},{"internalType":"address[]","name":"_assetAggregators","type":"address[]"},{"internalType":"enum IPriceFeedOracle.AggregatorType[]","name":"_aggregatorTypes","type":"uint8[]"},{"internalType":"uint8[]","name":"_assetDecimals","type":"uint8[]"},{"internalType":"address","name":"_safeTracker","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"uint256","name":"assetAddressesLength","type":"uint256"},{"internalType":"uint256","name":"aggregatorsLength","type":"uint256"},{"internalType":"uint256","name":"typesLength","type":"uint256"},{"internalType":"uint256","name":"decimalsLength","type":"uint256"}],"name":"ArgumentLengthMismatch","type":"error"},{"inputs":[],"name":"EmptyAssetAddresses","type":"error"},{"inputs":[],"name":"EthUsdAggregatorNotSet","type":"error"},{"inputs":[{"internalType":"address","name":"aggregator","type":"address"},{"internalType":"uint8","name":"aggregatorDecimals","type":"uint8"},{"internalType":"uint8","name":"expectedDecimals","type":"uint8"}],"name":"IncompatibleAggregatorDecimals","type":"error"},{"inputs":[{"internalType":"enum IPriceFeedOracle.AggregatorType","name":"actual","type":"uint8"},{"internalType":"enum IPriceFeedOracle.AggregatorType","name":"expected","type":"uint8"}],"name":"InvalidEthAggregatorType","type":"error"},{"inputs":[{"internalType":"address","name":"aggregator","type":"address"},{"internalType":"int256","name":"rate","type":"int256"}],"name":"NonPositiveRate","type":"error"},{"inputs":[{"internalType":"uint8","name":"aggregatorType","type":"uint8"}],"name":"UnknownAggregatorType","type":"error"},{"inputs":[{"internalType":"address","name":"asset","type":"address"}],"name":"UnknownAsset","type":"error"},{"inputs":[{"internalType":"string","name":"parameter","type":"string"}],"name":"ZeroAddress","type":"error"},{"inputs":[{"internalType":"address","name":"asset","type":"address"}],"name":"ZeroDecimals","type":"error"},{"inputs":[],"name":"ETH","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"assetAddress","type":"address"}],"name":"assets","outputs":[{"internalType":"contract Aggregator","name":"","type":"address"},{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"assetsMap","outputs":[{"internalType":"contract Aggregator","name":"aggregator","type":"address"},{"internalType":"enum IPriceFeedOracle.AggregatorType","name":"aggregatorType","type":"uint8"},{"internalType":"uint8","name":"decimals","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"assetAddress","type":"address"},{"internalType":"uint256","name":"ethIn","type":"uint256"}],"name":"getAssetForEth","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"assetAddress","type":"address"}],"name":"getAssetToEthRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"assetAddress","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"getEthForAsset","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"safeTracker","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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-----Decoded View---------------
Arg [0] : _assetAddresses (address[]): 0x6B175474E89094C44Da98b954EedeAC495271d0F,0xae7ab96520DE3A18E5e111B5EaAb095312D7fE84,0x27F23c710dD3d878FE9393d93465FeD1302f2EbD,0xae78736Cd615f374D3085123A210448E74Fc6393,0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48,0xcbB7C0000aB88B473b1f5aFd9ef808440eed33Bf,0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE
Arg [1] : _assetAggregators (address[]): 0x773616E4d11A78F511299002da57A0a94577F1f4,0x86392dC19c0b719886221c78AB11eb8Cf5c52812,0xCc72039A141c6e34a779eF93AEF5eB4C82A893c7,0x536218f9E9Eb48863970252233c8F271f554C2d0,0x986b5E1e1755e3C2440e960477f25201B0a8bbD4,0x2665701293fCbEB223D11A08D826563EDcCE423A,0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419
Arg [2] : _aggregatorTypes (uint8[]): 0,0,0,0,0,1,1
Arg [3] : _assetDecimals (uint8[]): 18,18,18,18,6,8,18
Arg [4] : _safeTracker (address): 0xcafeaB8B01C74c2239eA9b2B0F6aB2dD409c6c13

-----Encoded View---------------
37 Constructor Arguments found :
Arg [0] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [1] : 00000000000000000000000000000000000000000000000000000000000001a0
Arg [2] : 00000000000000000000000000000000000000000000000000000000000002a0
Arg [3] : 00000000000000000000000000000000000000000000000000000000000003a0
Arg [4] : 000000000000000000000000cafeab8b01c74c2239ea9b2b0f6ab2dd409c6c13
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [6] : 0000000000000000000000006b175474e89094c44da98b954eedeac495271d0f
Arg [7] : 000000000000000000000000ae7ab96520de3a18e5e111b5eaab095312d7fe84
Arg [8] : 00000000000000000000000027f23c710dd3d878fe9393d93465fed1302f2ebd
Arg [9] : 000000000000000000000000ae78736cd615f374d3085123a210448e74fc6393
Arg [10] : 000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48
Arg [11] : 000000000000000000000000cbb7c0000ab88b473b1f5afd9ef808440eed33bf
Arg [12] : 000000000000000000000000eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Arg [13] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [14] : 000000000000000000000000773616e4d11a78f511299002da57a0a94577f1f4
Arg [15] : 00000000000000000000000086392dc19c0b719886221c78ab11eb8cf5c52812
Arg [16] : 000000000000000000000000cc72039a141c6e34a779ef93aef5eb4c82a893c7
Arg [17] : 000000000000000000000000536218f9e9eb48863970252233c8f271f554c2d0
Arg [18] : 000000000000000000000000986b5e1e1755e3c2440e960477f25201b0a8bbd4
Arg [19] : 0000000000000000000000002665701293fcbeb223d11a08d826563edcce423a
Arg [20] : 0000000000000000000000005f4ec3df9cbd43714fe2740f5e3616155c5b8419
Arg [21] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [22] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [23] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [24] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [25] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [26] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [27] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [28] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [29] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [30] : 0000000000000000000000000000000000000000000000000000000000000012
Arg [31] : 0000000000000000000000000000000000000000000000000000000000000012
Arg [32] : 0000000000000000000000000000000000000000000000000000000000000012
Arg [33] : 0000000000000000000000000000000000000000000000000000000000000012
Arg [34] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [35] : 0000000000000000000000000000000000000000000000000000000000000008
Arg [36] : 0000000000000000000000000000000000000000000000000000000000000012