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// SPDX-License-Identifier: MIXED

// File @boringcrypto/boring-solidity/contracts/libraries/[email protected]
// License-Identifier: MIT
pragma solidity 0.6.12;

/// @notice A library for performing overflow-/underflow-safe math,
/// updated with awesomeness from of DappHub (https://github.com/dapphub/ds-math).
library BoringMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256 c) {
        require((c = a + b) >= b, "BoringMath: Add Overflow");
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256 c) {
        require((c = a - b) <= a, "BoringMath: Underflow");
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
        require(b == 0 || (c = a * b) / b == a, "BoringMath: Mul Overflow");
    }

    function to128(uint256 a) internal pure returns (uint128 c) {
        require(a <= uint128(-1), "BoringMath: uint128 Overflow");
        c = uint128(a);
    }

    function to64(uint256 a) internal pure returns (uint64 c) {
        require(a <= uint64(-1), "BoringMath: uint64 Overflow");
        c = uint64(a);
    }

    function to32(uint256 a) internal pure returns (uint32 c) {
        require(a <= uint32(-1), "BoringMath: uint32 Overflow");
        c = uint32(a);
    }
}

/// @notice A library for performing overflow-/underflow-safe addition and subtraction on uint128.
library BoringMath128 {
    function add(uint128 a, uint128 b) internal pure returns (uint128 c) {
        require((c = a + b) >= b, "BoringMath: Add Overflow");
    }

    function sub(uint128 a, uint128 b) internal pure returns (uint128 c) {
        require((c = a - b) <= a, "BoringMath: Underflow");
    }
}

/// @notice A library for performing overflow-/underflow-safe addition and subtraction on uint64.
library BoringMath64 {
    function add(uint64 a, uint64 b) internal pure returns (uint64 c) {
        require((c = a + b) >= b, "BoringMath: Add Overflow");
    }

    function sub(uint64 a, uint64 b) internal pure returns (uint64 c) {
        require((c = a - b) <= a, "BoringMath: Underflow");
    }
}

/// @notice A library for performing overflow-/underflow-safe addition and subtraction on uint32.
library BoringMath32 {
    function add(uint32 a, uint32 b) internal pure returns (uint32 c) {
        require((c = a + b) >= b, "BoringMath: Add Overflow");
    }

    function sub(uint32 a, uint32 b) internal pure returns (uint32 c) {
        require((c = a - b) <= a, "BoringMath: Underflow");
    }
}

// File contracts/interfaces/IOracle.sol
// License-Identifier: MIT
pragma solidity 0.6.12;

interface IOracle {
    /// @notice Get the latest exchange rate.
    /// @param data Usually abi encoded, implementation specific data that contains information and arguments to & about the oracle.
    /// For example:
    /// (string memory collateralSymbol, string memory assetSymbol, uint256 division) = abi.decode(data, (string, string, uint256));
    /// @return success if no valid (recent) rate is available, return false else true.
    /// @return rate The rate of the requested asset / pair / pool.
    function get(bytes calldata data) external returns (bool success, uint256 rate);

    /// @notice Check the last exchange rate without any state changes.
    /// @param data Usually abi encoded, implementation specific data that contains information and arguments to & about the oracle.
    /// For example:
    /// (string memory collateralSymbol, string memory assetSymbol, uint256 division) = abi.decode(data, (string, string, uint256));
    /// @return success if no valid (recent) rate is available, return false else true.
    /// @return rate The rate of the requested asset / pair / pool.
    function peek(bytes calldata data) external view returns (bool success, uint256 rate);

    /// @notice Check the current spot exchange rate without any state changes. For oracles like TWAP this will be different from peek().
    /// @param data Usually abi encoded, implementation specific data that contains information and arguments to & about the oracle.
    /// For example:
    /// (string memory collateralSymbol, string memory assetSymbol, uint256 division) = abi.decode(data, (string, string, uint256));
    /// @return rate The rate of the requested asset / pair / pool.
    function peekSpot(bytes calldata data) external view returns (uint256 rate);

    /// @notice Returns a human readable (short) name about this oracle.
    /// @param data Usually abi encoded, implementation specific data that contains information and arguments to & about the oracle.
    /// For example:
    /// (string memory collateralSymbol, string memory assetSymbol, uint256 division) = abi.decode(data, (string, string, uint256));
    /// @return (string) A human readable symbol name about this oracle.
    function symbol(bytes calldata data) external view returns (string memory);

    /// @notice Returns a human readable name about this oracle.
    /// @param data Usually abi encoded, implementation specific data that contains information and arguments to & about the oracle.
    /// For example:
    /// (string memory collateralSymbol, string memory assetSymbol, uint256 division) = abi.decode(data, (string, string, uint256));
    /// @return (string) A human readable name about this oracle.
    function name(bytes calldata data) external view returns (string memory);
}

// File contracts/oracles/wOHMLinkOracle.sol
// License-Identifier: MIT
pragma solidity 0.6.12;


// Chainlink Aggregator

interface IAggregator {
    function latestAnswer() external view returns (int256 answer);
}

interface IWOHM {
    function sOHMTowOHM( uint256 _amount ) external view returns ( uint256 );
}

contract wOHMOracleV1 is IOracle {
    using BoringMath for uint256; // Keep everything in uint256

    IAggregator public constant ohmOracle = IAggregator(0x90c2098473852E2F07678Fe1B6d595b1bd9b16Ed);
    IAggregator public constant ethUSDOracle = IAggregator(0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419);
    IWOHM public constant WOHM = IWOHM(0xCa76543Cf381ebBB277bE79574059e32108e3E65);

    // Calculates the lastest exchange rate
    // Uses both divide and multiply only for tokens not supported directly by Chainlink, for example MKR/USD
    function _get() internal view returns (uint256) {
        return 1e44 / (uint256(1e18).mul(uint256(ohmOracle.latestAnswer()).mul(uint256(ethUSDOracle.latestAnswer()))) / WOHM.sOHMTowOHM(1e9));
    }

    // Get the latest exchange rate
    /// @inheritdoc IOracle
    function get(bytes calldata) public override returns (bool, uint256) {
        return (true, _get());
    }

    // Check the last exchange rate without any state changes
    /// @inheritdoc IOracle
    function peek(bytes calldata ) public view override returns (bool, uint256) {
        return (true, _get());
    }

    // Check the current spot exchange rate without any state changes
    /// @inheritdoc IOracle
    function peekSpot(bytes calldata data) external view override returns (uint256 rate) {
        (, rate) = peek(data);
    }

    /// @inheritdoc IOracle
    function name(bytes calldata) public view override returns (string memory) {
        return "wOHM Chainlink";
    }

    /// @inheritdoc IOracle
    function symbol(bytes calldata) public view override returns (string memory) {
        return "LINK/wOHM";
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 9000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

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[{"inputs":[],"name":"WOHM","outputs":[{"internalType":"contract IWOHM","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ethUSDOracle","outputs":[{"internalType":"contract IAggregator","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"","type":"bytes"}],"name":"get","outputs":[{"internalType":"bool","name":"","type":"bool"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes","name":"","type":"bytes"}],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ohmOracle","outputs":[{"internalType":"contract IAggregator","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"","type":"bytes"}],"name":"peek","outputs":[{"internalType":"bool","name":"","type":"bool"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"data","type":"bytes"}],"name":"peekSpot","outputs":[{"internalType":"uint256","name":"rate","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"","type":"bytes"}],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"}]

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