LSSVMRouter::_swapETHForSpecificNFTs.sol

// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.8.0;

contract LSSVMRouter {
    function _swapETHForSpecificNFTs(
        PairSwapSpecific[] calldata swapList,
        uint256 inputAmount,
        address payable ethRecipient,
        address nftRecipient
    ) internal virtual returns (uint256 remainingValue) {
        remainingValue = inputAmount;

        uint256 pairCost;
        CurveErrorCodes.Error error;

        // Do swaps
        uint256 numSwaps = swapList.length;
        for (uint256 i; i < numSwaps;) {
            // Calculate the cost per swap first to send exact amount of ETH over, saves gas by avoiding the need to send back excess ETH
            (error,,, pairCost,,) = swapList[i].pair.getBuyNFTQuote(swapList[i].nftIds[0], swapList[i].nftIds.length);

            // Require no errors
            require(error == CurveErrorCodes.Error.OK, "Bonding curve error");

            // Total ETH taken from sender cannot exceed inputAmount
            // because otherwise the deduction from remainingValue will fail
            remainingValue -= swapList[i].pair.swapTokenForSpecificNFTs{value: pairCost}(
                swapList[i].nftIds, remainingValue, nftRecipient, true, msg.sender
            );

            unchecked {
                ++i;
            }
        }

        // Return remaining value to sender
        if (remainingValue > 0) {
            ethRecipient.safeTransferETH(remainingValue);
        }
    }
}