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// SPDX-License-Identifier: GPL-3.0-only
pragma solidity 0.8.16;

import "../IPriceGetterProtocol.sol";
import "../../IPriceGetter.sol";
import "../../lib/UtilityLibrary.sol";
import "./interfaces/IApePair.sol";
import "./interfaces/IApeFactory.sol";

contract PriceGetterUniV2 is IPriceGetterProtocol {
    struct LocalVarsV2Price {
        uint256 usdStableTotal;
        uint256 wrappedNativeReserve;
        uint256 wrappedNativeTotal;
        uint256 tokenReserve;
        uint256 stableUsdReserve;
    }

    // ========== Get Token Prices ==========

    function getTokenPrice(
        address token,
        address factory,
        PriceGetterParams memory params
    ) public view override returns (uint256 price) {
        IApeFactory factoryV2 = IApeFactory(factory);
        uint256 nativePrice = params.mainPriceGetter.getNativePrice(IPriceGetter.Protocol.UniV2, address(factoryV2));
        if (token == params.wrappedNative.tokenAddress) {
            /// @dev Returning high total balance for wrappedNative to heavily weight value.
            return nativePrice;
        }

        LocalVarsV2Price memory vars;

        (vars.tokenReserve, vars.wrappedNativeReserve) = _getNormalizedReservesFromFactoryV2_Decimals(
            factoryV2,
            token,
            params.wrappedNative.tokenAddress,
            UtilityLibrary._getTokenDecimals(token),
            params.wrappedNative.decimals
        );
        vars.wrappedNativeTotal = (vars.wrappedNativeReserve * nativePrice) / 1e18;
        uint256 tokenTotal = vars.tokenReserve;

        for (uint256 i = 0; i < params.stableUsdTokens.length; i++) {
            IPriceGetter.TokenAndDecimals memory stableUsdToken = params.stableUsdTokens[i];
            (vars.tokenReserve, vars.stableUsdReserve) = _getNormalizedReservesFromFactoryV2_Decimals(
                factoryV2,
                token,
                stableUsdToken.tokenAddress,
                UtilityLibrary._getTokenDecimals(token),
                stableUsdToken.decimals
            );
            uint256 stableUsdPrice = params.mainPriceGetter.getOraclePriceNormalized(stableUsdToken.tokenAddress);

            if (stableUsdPrice > 0) {
                /// @dev Weighting the USD side of the pair by the price of the USD stable token if it exists.
                vars.usdStableTotal += (vars.stableUsdReserve * stableUsdPrice) / 1e18;
            } else {
                vars.usdStableTotal += vars.stableUsdReserve;
            }
            tokenTotal += vars.tokenReserve;
        }

        if (tokenTotal == 0) {
            return 0;
        }
        price = ((vars.usdStableTotal + vars.wrappedNativeTotal) * 1e18) / tokenTotal;
    }

    // ========== LP PRICE ==========

    function getLPPrice(
        address lp,
        address factory,
        PriceGetterParams memory params
    ) public view override returns (uint256 price) {
        //if not a LP, handle as a standard token
        try IApePair(lp).getReserves() returns (uint112 reserve0, uint112 reserve1, uint32) {
            address token0 = IApePair(lp).token0();
            address token1 = IApePair(lp).token1();
            uint256 totalSupply = IApePair(lp).totalSupply();

            //price0*reserve0+price1*reserve1
            uint256 token0Price = getTokenPrice(token0, factory, params);
            uint256 token1Price = getTokenPrice(token1, factory, params);
            reserve0 = UtilityLibrary._normalizeToken112(reserve0, token0);
            reserve1 = UtilityLibrary._normalizeToken112(reserve1, token1);
            uint256 totalValue = (token0Price * uint256(reserve0)) + (token1Price * uint256(reserve1));

            return totalValue / totalSupply;
        } catch {
            /// @dev If the pair is not a valid LP, return the price of the token
            uint256 lpPrice = getTokenPrice(lp, factory, params);
            return lpPrice;
        }
    }

    // ========== NATIVE PRICE ==========

    function getNativePrice(
        address factory,
        PriceGetterParams memory params
    ) public view override returns (uint256 price) {
        IApeFactory factoryV2 = IApeFactory(factory);
        uint256 wrappedNativeTotal;

        /// @dev This method calculates the price of wrappedNative by comparing multiple stable pools and weighting by their oracle price
        uint256 usdStableTotal = 0;
        for (uint256 i = 0; i < params.stableUsdTokens.length; i++) {
            IPriceGetter.TokenAndDecimals memory stableUsdToken = params.stableUsdTokens[i];
            (uint256 wrappedNativeReserve, uint256 stableUsdReserve) = _getNormalizedReservesFromFactoryV2_Decimals(
                factoryV2,
                params.wrappedNative.tokenAddress,
                stableUsdToken.tokenAddress,
                params.wrappedNative.decimals,
                stableUsdToken.decimals
            );
            uint256 stableUsdPrice = params.mainPriceGetter.getOraclePriceNormalized(stableUsdToken.tokenAddress);
            if (stableUsdPrice > 0) {
                /// @dev Weighting the USD side of the pair by the price of the USD stable token if it exists.
                usdStableTotal += (stableUsdReserve * stableUsdPrice) / 1e18;
            } else {
                usdStableTotal += stableUsdReserve;
            }
            wrappedNativeTotal += wrappedNativeReserve;
        }

        price = (usdStableTotal * 1e18) / wrappedNativeTotal;
    }

    // ========== INTERNAL FUNCTIONS ==========

    /**
     * @dev Get normalized reserves for a given token pair from the ApeSwap Factory contract, specifying decimals.
     * @param factoryV2 The address of the V2 factory.
     * @param tokenA The address of the first token in the pair.
     * @param tokenB The address of the second token in the pair.
     * @param decimalsA The number of decimals for the first token in the pair.
     * @param decimalsB The number of decimals for the second token in the pair.
     * @return normalizedReserveA The normalized reserve of the first token in the pair.
     * @return normalizedReserveB The normalized reserve of the second token in the pair.
     */
    function _getNormalizedReservesFromFactoryV2_Decimals(
        IApeFactory factoryV2,
        address tokenA,
        address tokenB,
        uint8 decimalsA,
        uint8 decimalsB
    ) internal view returns (uint256 normalizedReserveA, uint256 normalizedReserveB) {
        address pairAddress = factoryV2.getPair(tokenA, tokenB);
        if (pairAddress == address(0)) {
            return (0, 0);
        }
        return _getNormalizedReservesFromPair_Decimals(pairAddress, tokenA, tokenB, decimalsA, decimalsB);
    }

    /**
     * @dev This internal function takes in a pair address, two token addresses (tokenA and tokenB), and their respective decimals.
     * It returns the normalized reserves for each token in the pair.
     *
     * This function uses the IApePair interface to get the current reserves of the given token pair
     * If successful, it returns the normalized reserves for each token in the pair by calling _normalize() on
     * the reserve values. The order of the returned normalized reserve values depends on the lexicographic ordering
     * of tokenA and tokenB.
     *
     * @param pair Address of the liquidity pool contract representing the token pair
     * @param tokenA Address of one of the tokens in the pair. Assumed to be a valid address in the pair to save on gas.
     * @param tokenB Address of the other token in the pair. Assumed to be a valid address in the pair to save on gas.
     * @param decimalsA The number of decimals for tokenA
     * @param decimalsB The number of decimals for tokenB
     * @return normalizedReserveA The normalized reserve value for tokenA
     * @return normalizedReserveB The normalized reserve value for tokenB
     */
    function _getNormalizedReservesFromPair_Decimals(
        address pair,
        address tokenA,
        address tokenB,
        uint8 decimalsA,
        uint8 decimalsB
    ) internal view returns (uint256 normalizedReserveA, uint256 normalizedReserveB) {
        (bool success, bytes memory returnData) = pair.staticcall(abi.encodeWithSignature("getReserves()"));

        if (success) {
            try this.decodeReservesWithLP(returnData) returns (uint112 reserve0, uint112 reserve1, uint32) {
                if (UtilityLibrary._isSorted(tokenA, tokenB)) {
                    return (
                        UtilityLibrary._normalize(reserve0, decimalsA),
                        UtilityLibrary._normalize(reserve1, decimalsB)
                    );
                } else {
                    return (
                        UtilityLibrary._normalize(reserve1, decimalsA),
                        UtilityLibrary._normalize(reserve0, decimalsB)
                    );
                }
            } catch {
                (success, returnData) = pair.staticcall(abi.encodeWithSignature("getFictiveReserves()"));
                try this.decodeReservesWithoutLP(returnData) returns (uint256 reserve0, uint256 reserve1) {
                    if (UtilityLibrary._isSorted(tokenA, tokenB)) {
                        return (
                            UtilityLibrary._normalize(reserve0, decimalsA),
                            UtilityLibrary._normalize(reserve1, decimalsB)
                        );
                    } else {
                        return (
                            UtilityLibrary._normalize(reserve1, decimalsA),
                            UtilityLibrary._normalize(reserve0, decimalsB)
                        );
                    }
                } catch {
                    return (0, 0);
                }
            }
        } else {
            return (0, 0);
        }
    }

    function decodeReservesWithLP(
        bytes memory data
    ) public pure returns (uint112 reserve0, uint112 reserve1, uint32 lp) {
        return abi.decode(data, (uint112, uint112, uint32));
    }

    function decodeReservesWithoutLP(bytes memory data) public pure returns (uint256 reserve0, uint256 reserve1) {
        return abi.decode(data, (uint256, uint256));
    }
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity 0.8.16;

import "../IPriceGetter.sol";

interface IPriceGetterProtocol {
    struct PriceGetterParams {
        IPriceGetter mainPriceGetter;
        IPriceGetter.TokenAndDecimals wrappedNative;
        IPriceGetter.TokenAndDecimals[] stableUsdTokens;
        uint256 nativeLiquidityThreshold;
    }

    /**
     * @dev Returns the price of a token.
     * @param token The address of the token to get the price for.
     * @return price The current price of the token.
     */
    function getTokenPrice(
        address token,
        address factory,
        PriceGetterParams memory params
    ) external view returns (uint256 price);

    /**
     * @dev Returns the price of an LP token.
     * @param lp The address of the LP token to get the price for.
     * @return price The current price of the LP token.
     */
    function getLPPrice(
        address lp,
        address factory,
        PriceGetterParams memory params
    ) external view returns (uint256 price);

    /**
     * @dev Returns the current price of the native token in USD.
     * @return nativePrice The current price of the native token in USD.
     */
    function getNativePrice(
        address factory,
        PriceGetterParams memory params
    ) external view returns (uint256 nativePrice);
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity >=0.6.6;

interface IApeFactory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function feeTo() external view returns (address);

    function feeToSetter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);

    function allPairs(uint) external view returns (address pair);

    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setFeeTo(address) external;

    function setFeeToSetter(address) external;
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity >=0.6.6;

interface IApePair {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint);

    function balanceOf(address owner) external view returns (uint);

    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);

    function transfer(address to, uint value) external returns (bool);

    function transferFrom(address from, address to, uint value) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);

    function price0CumulativeLast() external view returns (uint);

    function price1CumulativeLast() external view returns (uint);

    function kLast() external view returns (uint);

    function mint(address to) external returns (uint liquidity);

    function burn(address to) external returns (uint amount0, uint amount1);

    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity 0.8.16;

interface IPriceGetter {
    enum Protocol {
        __,
        ___,
        UniV2,
        UniV3,
        Algebra,
        _Gamma, // outdated
        _Steer, // outdated
        Solidly,
        Xfai,
        Curve,
        AlgebraIntegral
    }

    enum Wrappers {
        Gamma,
        Ichi,
        Steer
    }

    struct TokenAndDecimals {
        address tokenAddress;
        uint8 decimals;
    }

    function getTokenPrice(address token, Protocol protocol, address factory) external view returns (uint256 price);
    function getLPPrice(address lp, Protocol protocol, address factory) external view returns (uint256 price);
    function getWrappedLPPrice(
        address lp,
        Protocol protocol,
        address factory,
        IPriceGetter.Wrappers wrapper
    ) external view returns (uint256 price);
    function getNativePrice(Protocol protocol, address factory) external view returns (uint256 nativePrice);
    function getOraclePriceNormalized(address token) external view returns (uint256 price);
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity 0.8.16;

import "../token-lib/IERC20.sol";

library UtilityLibrary {
    function _isSorted(address tokenA, address tokenB) internal pure returns (bool isSorted) {
        //  (address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        isSorted = tokenA < tokenB ? true : false;
    }

    function _getTokenDecimals(address token) internal view returns (uint8 decimals) {
        try IERC20(token).decimals() returns (uint8 dec) {
            decimals = dec;
        } catch {
            decimals = 18;
        }
    }

    /// @notice Normalize the amount of a token to wei or 1e18
    function _normalizeToken(uint256 amount, address token) internal view returns (uint256) {
        return _normalize(amount, _getTokenDecimals(token));
    }

    /// @notice Normalize the amount of a token to wei or 1e18
    function _normalizeToken112(uint112 amount, address token) internal view returns (uint112) {
        return _normalize112(amount, _getTokenDecimals(token));
    }

    /// @notice Normalize the amount passed to wei or 1e18 decimals
    function _normalize(uint256 amount, uint8 decimals) internal pure returns (uint256) {
        if (decimals == 18) return amount;
        return (amount * (10 ** 18)) / (10 ** decimals);
    }

    /// @notice Normalize the amount passed to wei or 1e18 decimals
    function _normalize112(uint112 amount, uint8 decimals) internal pure returns (uint112) {
        if (decimals == 18) {
            return amount;
        } else if (decimals > 18) {
            return uint112(amount / (10 ** (decimals - 18)));
        } else {
            return uint112(amount * (10 ** (18 - decimals)));
        }
    }
}

// SPDX-License-Identifier: GPL-3.0-only
pragma solidity >=0.5.0;

interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint value);

    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view returns (uint8);

    function totalSupply() external view returns (uint);

    function balanceOf(address owner) external view returns (uint);

    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);

    function transfer(address to, uint value) external returns (bool);

    function transferFrom(address from, address to, uint value) external returns (bool);
}

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

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[{"inputs":[{"internalType":"bytes","name":"data","type":"bytes"}],"name":"decodeReservesWithLP","outputs":[{"internalType":"uint112","name":"reserve0","type":"uint112"},{"internalType":"uint112","name":"reserve1","type":"uint112"},{"internalType":"uint32","name":"lp","type":"uint32"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"bytes","name":"data","type":"bytes"}],"name":"decodeReservesWithoutLP","outputs":[{"internalType":"uint256","name":"reserve0","type":"uint256"},{"internalType":"uint256","name":"reserve1","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"lp","type":"address"},{"internalType":"address","name":"factory","type":"address"},{"components":[{"internalType":"contract IPriceGetter","name":"mainPriceGetter","type":"address"},{"components":[{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint8","name":"decimals","type":"uint8"}],"internalType":"struct IPriceGetter.TokenAndDecimals","name":"wrappedNative","type":"tuple"},{"components":[{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint8","name":"decimals","type":"uint8"}],"internalType":"struct IPriceGetter.TokenAndDecimals[]","name":"stableUsdTokens","type":"tuple[]"},{"internalType":"uint256","name":"nativeLiquidityThreshold","type":"uint256"}],"internalType":"struct IPriceGetterProtocol.PriceGetterParams","name":"params","type":"tuple"}],"name":"getLPPrice","outputs":[{"internalType":"uint256","name":"price","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"factory","type":"address"},{"components":[{"internalType":"contract IPriceGetter","name":"mainPriceGetter","type":"address"},{"components":[{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint8","name":"decimals","type":"uint8"}],"internalType":"struct IPriceGetter.TokenAndDecimals","name":"wrappedNative","type":"tuple"},{"components":[{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint8","name":"decimals","type":"uint8"}],"internalType":"struct IPriceGetter.TokenAndDecimals[]","name":"stableUsdTokens","type":"tuple[]"},{"internalType":"uint256","name":"nativeLiquidityThreshold","type":"uint256"}],"internalType":"struct IPriceGetterProtocol.PriceGetterParams","name":"params","type":"tuple"}],"name":"getNativePrice","outputs":[{"internalType":"uint256","name":"price","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"factory","type":"address"},{"components":[{"internalType":"contract IPriceGetter","name":"mainPriceGetter","type":"address"},{"components":[{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint8","name":"decimals","type":"uint8"}],"internalType":"struct IPriceGetter.TokenAndDecimals","name":"wrappedNative","type":"tuple"},{"components":[{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint8","name":"decimals","type":"uint8"}],"internalType":"struct IPriceGetter.TokenAndDecimals[]","name":"stableUsdTokens","type":"tuple[]"},{"internalType":"uint256","name":"nativeLiquidityThreshold","type":"uint256"}],"internalType":"struct IPriceGetterProtocol.PriceGetterParams","name":"params","type":"tuple"}],"name":"getTokenPrice","outputs":[{"internalType":"uint256","name":"price","type":"uint256"}],"stateMutability":"view","type":"function"}]

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