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// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.6.12;

import "@openzeppelin/contracts-upgradeable/math/SafeMathUpgradeable.sol";

import "../external/compound/CErc20.sol";

import "../external/curve/ICurveFactoryRegistry.sol";
import "../external/curve/ICurvePool.sol";

import "./BasePriceOracle.sol";

interface ERC20Upgradeable {
    function decimals() external view returns(uint8);
}

/**
 * @title CurveFactoryLpTokenPriceOracle
 * @author David Lucid <[email protected]> (https://github.com/davidlucid)
 * @notice CurveFactoryLpTokenPriceOracle is a price oracle for Curve LP tokens (using the sender as a root oracle).
 * @dev Implements the `PriceOracle` interface used by Fuse pools (and Compound v2).
 */
contract CurveFactoryLpTokenPriceOracle is PriceOracle, BasePriceOracle {
    using SafeMathUpgradeable for uint256;

    /**
     * @notice Get the LP token price price for an underlying token address.
     * @param underlying The underlying token address for which to get the price (set to zero address for ETH).
     * @return Price denominated in ETH (scaled by 1e18).
     */
    function price(address underlying) external override view returns (uint) {
        return _price(underlying);
    }

    /**
     * @notice Returns the price in ETH of the token underlying `cToken`.
     * @dev Implements the `PriceOracle` interface for Fuse pools (and Compound v2).
     * @return Price in ETH of the token underlying `cToken`, scaled by `10 ** (36 - underlyingDecimals)`.
     */
    function getUnderlyingPrice(CToken cToken) external override view returns (uint) {
        address underlying = CErc20(address(cToken)).underlying();
        // Comptroller needs prices to be scaled by 1e(36 - decimals)
        // Since `_price` returns prices scaled by 18 decimals, we must scale them by 1e(36 - 18 - decimals)
        return _price(underlying).mul(1e18).div(10 ** uint256(ERC20Upgradeable(underlying).decimals()));
    }

    /**
     * @dev Fetches the fair LP token/ETH price from Curve, with 18 decimals of precision.
     * Source: https://github.com/AlphaFinanceLab/homora-v2/blob/master/contracts/oracle/CurveOracle.sol
     * @param pool pool LP token
     */
    function _price(address pool) internal view returns (uint) {
        address[] memory tokens = underlyingTokens[pool];
        require(tokens.length != 0, "LP token is not registered.");
        uint256 minPx = uint256(-1);
        uint256 n = tokens.length;

        for (uint256 i = 0; i < n; i++) {
            address ulToken = tokens[i];
            uint256 tokenPx = BasePriceOracle(msg.sender).price(ulToken);
            if (tokenPx < minPx) minPx = tokenPx;
        }

        require(minPx != uint256(-1), "No minimum underlying token price found.");      
        return minPx.mul(ICurvePool(pool).get_virtual_price()).div(1e18); // Use min underlying token prices
    }

    /**
     * @dev The Curve registry.
     */
    ICurveFactoryRegistry public constant registry = ICurveFactoryRegistry(0xB9fC157394Af804a3578134A6585C0dc9cc990d4);

    /**
     * @dev Maps Curve LP token addresses to underlying token addresses.
     */
    mapping(address => address[]) public underlyingTokens;

    /**
     * @dev Maps Curve LP token addresses to pool addresses.
     */
    mapping(address => address) public poolOf;

    /**
     * @dev Register the pool given LP token address and set the pool info.
     * Source: https://github.com/AlphaFinanceLab/homora-v2/blob/master/contracts/oracle/CurveOracle.sol
     * @param pool pool LP token
     */
    function registerPool(address pool) external {
        uint n = registry.get_n_coins(pool);
        require(n != 0, "n");
        address[4] memory tokens = registry.get_coins(pool);
        for (uint256 i = 0; i < n; i++) underlyingTokens[pool].push(tokens[i]);
    }
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.6.12;

import "./CToken.sol";

/**
 * @title Compound's CErc20 Contract
 * @notice CTokens which wrap an EIP-20 underlying
 * @author Compound
 */
interface CErc20 is CToken {
    function underlying() external view returns (address);
    function liquidateBorrow(address borrower, uint repayAmount, CToken cTokenCollateral) external returns (uint);
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.6.12;

/**
 * @title Compound's CToken Contract
 * @notice Abstract base for CTokens
 * @author Compound
 */
interface CToken {
    function admin() external view returns (address);
    function adminHasRights() external view returns (bool);
    function fuseAdminHasRights() external view returns (bool);
    function symbol() external view returns (string memory);
    function comptroller() external view returns (address);
    function adminFeeMantissa() external view returns (uint256);
    function fuseFeeMantissa() external view returns (uint256);
    function reserveFactorMantissa() external view returns (uint256);
    function totalReserves() external view returns (uint);
    function totalAdminFees() external view returns (uint);
    function totalFuseFees() external view returns (uint);

    function isCToken() external view returns (bool);
    function isCEther() external view returns (bool);

    function balanceOf(address owner) external view returns (uint);
    function balanceOfUnderlying(address owner) external returns (uint);
    function borrowRatePerBlock() external view returns (uint);
    function supplyRatePerBlock() external view returns (uint);
    function totalBorrowsCurrent() external returns (uint);
    function borrowBalanceStored(address account) external view returns (uint);
    function exchangeRateStored() external view returns (uint);
    function getCash() external view returns (uint);

    function redeem(uint redeemTokens) external returns (uint);
    function redeemUnderlying(uint redeemAmount) external returns (uint);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.6.12;

interface ICurveFactoryRegistry {
    function get_n_coins(address lp) external view returns (uint);
    function get_coins(address pool) external view returns (address[4] memory);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.6.12;

interface ICurvePool {
    function get_virtual_price() external view returns (uint);
    function remove_liquidity_one_coin(uint256 _token_amount, int128 i, uint256 min_amount) external;
    function exchange(int128 i, int128 j, uint256 dx, uint256 min_dy) external returns (uint256);
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.6.12;

import "../external/compound/PriceOracle.sol";

/**
 * @title BasePriceOracle
 * @notice Returns prices of underlying tokens directly without the caller having to specify a cToken address.
 * @dev Implements the `PriceOracle` interface.
 * @author David Lucid <[email protected]> (https://github.com/davidlucid)
 */
interface BasePriceOracle is PriceOracle {
    /**
     * @notice Get the price of an underlying asset.
     * @param underlying The underlying asset to get the price of.
     * @return The underlying asset price in ETH as a mantissa (scaled by 1e18).
     * Zero means the price is unavailable.
     */
    function price(address underlying) external view returns (uint);
}

// SPDX-License-Identifier: BSD-3-Clause
pragma solidity 0.6.12;

import "./CToken.sol";

interface PriceOracle {
    /**
      * @notice Get the underlying price of a cToken asset
      * @param cToken The cToken to get the underlying price of
      * @return The underlying asset price mantissa (scaled by 1e18).
      *  Zero means the price is unavailable.
      */
    function getUnderlyingPrice(CToken cToken) external view returns (uint);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMathUpgradeable {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

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

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[{"inputs":[{"internalType":"contract CToken","name":"cToken","type":"address"}],"name":"getUnderlyingPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"poolOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"underlying","type":"address"}],"name":"price","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"pool","type":"address"}],"name":"registerPool","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"registry","outputs":[{"internalType":"contract ICurveFactoryRegistry","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"underlyingTokens","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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