// SPDX-License-Identifier: MIT
// Gearbox Protocol. Generalized leverage for DeFi protocols
// (c) Gearbox Holdings, 2022
pragma solidity ^0.8.10;

interface IWETHGateway {
    /// @dev Converts ETH to WETH and add liqudity to the pool
    /// @param pool Address of PoolService contract to add liquidity to. This pool must have WETH as an underlying.
    /// @param onBehalfOf The address that will receive the diesel token.
    /// @param referralCode Code used to log the transaction facilitator, for potential rewards. 0 if non-applicable.
    function addLiquidityETH(
        address pool,
        address onBehalfOf,
        uint16 referralCode
    ) external payable;

    /// @dev Removes liquidity from the pool and converts WETH to ETH
    ///       - burns lp's diesel (LP) tokens
    ///       - unwraps WETH to ETH and sends to the LP
    /// @param pool Address of PoolService contract to withdraw liquidity from. This pool must have WETH as an underlying.
    /// @param amount Amount of Diesel tokens to send.
    /// @param to Address to transfer ETH to.
    function removeLiquidityETH(
        address pool,
        uint256 amount,
        address payable to
    ) external;

    /// @dev Converts WETH to ETH, and sends to the passed address
    /// @param to Address to send ETH to
    /// @param amount Amount of WETH to unwrap
    function unwrapWETH(address to, uint256 amount) external;
}