// SPDX-License-Identifier: GPL-3.0-or-later
pragma solidity >=0.6.0;

import {BytesLib} from './BytesLib.sol';
import {Constants} from '../../../libraries/Constants.sol';

/// @title Functions for manipulating path data for multihop swaps
library V3Path {
    using BytesLib for bytes;

    /// @notice Returns true iff the path contains two or more pools
    /// @param path The encoded swap path
    /// @return True if path contains two or more pools, otherwise false
    function hasMultiplePools(bytes calldata path) internal pure returns (bool) {
        return path.length >= Constants.MULTIPLE_V3_POOLS_MIN_LENGTH;
    }

    /// @notice Decodes the first pool in path
    /// @param path The bytes encoded swap path
    /// @return tokenA The first token of the given pool
    /// @return fee The fee level of the pool
    /// @return tokenB The second token of the given pool
    function decodeFirstPool(bytes calldata path) internal pure returns (address, uint24, address) {
        return path.toPool();
    }

    /// @notice Gets the segment corresponding to the first pool in the path
    /// @param path The bytes encoded swap path
    /// @return The segment containing all data necessary to target the first pool in the path
    function getFirstPool(bytes calldata path) internal pure returns (bytes calldata) {
        return path[:Constants.V3_POP_OFFSET];
    }

    function decodeFirstToken(bytes calldata path) internal pure returns (address tokenA) {
        tokenA = path.toAddress();
    }

    /// @notice Skips a token + fee element
    /// @param path The swap path
    function skipToken(bytes calldata path) internal pure returns (bytes calldata) {
        return path[Constants.NEXT_V3_POOL_OFFSET:];
    }
}