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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import { IERC20MetadataUpgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";

import { ISolidlyPair} from "../../interfaces/common/ISolidlyPair.sol";
import { BeefyOracleHelper, IBeefyOracle, BeefyOracleErrors } from "./BeefyOracleHelper.sol";

/// @title Beefy Oracle for Solidly
/// @author Beefy, @kexley
/// @notice On-chain oracle using Solidly
contract BeefyOracleSolidly {

    /// @notice Fetch price from the Solidly pairs using the TWAP observations
    /// @param _data Payload from the central oracle with the addresses of the token route, pool 
    /// route and TWAP periods counted in 30 minute increments
    /// @return price Retrieved price from the chained quotes
    /// @return success Successful price fetch or not
    function getPrice(bytes calldata _data) external returns (uint256 price, bool success) {
        (address[] memory tokens, address[] memory pools, uint256[] memory twapPeriods) = 
            abi.decode(_data, (address[], address[], uint256[]));

        uint256 amount = 10 ** IERC20MetadataUpgradeable(tokens[0]).decimals();
        for (uint i; i < pools.length; i++) {
            amount = ISolidlyPair(pools[i]).quote(tokens[i], amount, twapPeriods[i]);
        }

        price = BeefyOracleHelper.priceFromBaseToken(
            msg.sender, tokens[tokens.length - 1], tokens[0], amount
        );
        if (price != 0) success = true;
    }

    /// @notice Data validation for new oracle data being added to central oracle
    /// @param _data Encoded addresses of the token route, pool route and TWAP periods
    function validateData(bytes calldata _data) external view {
        (address[] memory tokens, address[] memory pools, uint256[] memory twapPeriods) = 
            abi.decode(_data, (address[], address[], uint256[]));

        if (tokens.length != pools.length + 1 || tokens.length != twapPeriods.length + 1) {
            revert BeefyOracleErrors.ArrayLength();
        }
        
        uint256 basePrice = IBeefyOracle(msg.sender).getPrice(tokens[0]);
        if (basePrice == 0) revert BeefyOracleErrors.NoBasePrice(tokens[0]);

        uint256 poolLength = pools.length;
        for (uint i; i < poolLength;) {
            address fromToken = tokens[i];
            address toToken = tokens[i + 1];
            address pool = pools[i];
            address token0 = ISolidlyPair(pool).token0();
            address token1 = ISolidlyPair(pool).token1();

            if (fromToken != token0 && fromToken != token1) {
                revert BeefyOracleErrors.TokenNotInPair(fromToken, pool);
            }
            if (toToken != token0 && toToken != token1) {
                revert BeefyOracleErrors.TokenNotInPair(toToken, pool);
            }
            unchecked { ++i; }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/// @title Beefy Oracle Errors
/// @author Beefy, @kexley
/// @notice Error list for Beefy Oracles
contract BeefyOracleErrors {

    /// @dev No response from the Chainlink feed
    error NoAnswer();

    /// @dev No price for base token
    /// @param token Base token
    error NoBasePrice(address token);

    /// @dev Token is not present in the pair
    /// @param token Input token
    /// @param pair Pair token
    error TokenNotInPair(address token, address pair);

    /// @dev Array length is not correct
    error ArrayLength();

}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import { IERC20MetadataUpgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";

import { IBeefyOracle } from "../../interfaces/oracle/IBeefyOracle.sol";
import { BeefyOracleErrors } from "./BeefyOracleErrors.sol";

/// @title Beefy Oracle Helper
/// @author Beefy, @kexley
/// @notice Helper functions for Beefy oracles
library BeefyOracleHelper {

    /// @dev Calculate the price of the output token in 18 decimals given the base token price 
    /// and the amount out received from swapping 1 unit of the base token
    /// @param _oracle Central Beefy oracle which stores the base token price
    /// @param _token Address of token to calculate the price of
    /// @param _baseToken Address of the base token used in the price chain
    /// @param _amountOut Amount received from swapping 1 unit of base token into the target token
    /// @return price Price of the target token in 18 decimals
    function priceFromBaseToken(
        address _oracle,
        address _token,
        address _baseToken,
        uint256 _amountOut
    ) internal returns (uint256 price) {
        (uint256 basePrice,) = IBeefyOracle(_oracle).getFreshPrice(_baseToken);
        uint8 decimals = IERC20MetadataUpgradeable(_token).decimals();
        _amountOut = scaleAmount(_amountOut, decimals);
        price =  basePrice * 1 ether / _amountOut;
    }

    /// @dev Scale an input amount to 18 decimals
    /// @param _amount Amount to be scaled up or down
    /// @param _decimals Decimals that the amount is already in
    /// @return scaledAmount New scaled amount in 18 decimals
    function scaleAmount(
        uint256 _amount,
        uint8 _decimals
    ) internal pure returns (uint256 scaledAmount) {
        scaledAmount = _decimals == 18 ? _amount : _amount * 10 ** 18 / 10 ** _decimals;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.9.0;

interface ISolidlyPair {
    function factory() external view returns (address);
    function token0() external view returns (address);
    function token1() external view returns (address);
    function burn(address to) external returns (uint amount0, uint amount1);
    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function stable() external view returns (bool);
    function getAmountOut(uint256 amountIn, address tokenIn) external view returns (uint256);
    function quote(address tokenIn, uint256 amountIn, uint256 granularity) external returns (uint256 amountOut);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IBeefyOracle {
    function getPrice(address token) external view returns (uint256 price);
    function getPrice(address[] calldata tokens) external view returns (uint256[] memory prices);
    function getFreshPrice(address token) external returns (uint256 price, bool success);
    function getFreshPrice(address[] calldata tokens) external returns (uint256[] memory prices, bool[] memory successes);
}

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

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[{"inputs":[],"name":"ArrayLength","type":"error"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"NoBasePrice","type":"error"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"pair","type":"address"}],"name":"TokenNotInPair","type":"error"},{"inputs":[{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"getPrice","outputs":[{"internalType":"uint256","name":"price","type":"uint256"},{"internalType":"bool","name":"success","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"validateData","outputs":[],"stateMutability":"view","type":"function"}]

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