// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.17;

/* solhint-disable no-inline-assembly */

import {calldataKeccak} from "../core/Helpers.sol";

/**
 * User Operation struct
 * @param sender the sender account of this request.
 * @param nonce unique value the sender uses to verify it is not a replay.
 * @param initCode if set, the account contract will be created by this constructor/
 * @param callData the method call to execute on this account.
 * @param callGasLimit the gas limit passed to the callData method call.
 * @param verificationGasLimit gas used for validateUserOp and validatePaymasterUserOp.
 * @param preVerificationGas gas not calculated by the handleOps method, but added to the gas paid. Covers batch overhead.
 * @param maxFeePerGas same as EIP-1559 gas parameter.
 * @param maxPriorityFeePerGas same as EIP-1559 gas parameter.
 * @param paymasterAndData if set, this field holds the paymaster address and paymaster-specific data. the paymaster will pay for the transaction instead of the sender.
 * @param signature sender-verified signature over the entire request, the EntryPoint address and the chain ID.
 */
struct UserOperation {
    address sender;
    uint256 nonce;
    bytes initCode;
    bytes callData;
    uint256 callGasLimit;
    uint256 verificationGasLimit;
    uint256 preVerificationGas;
    uint256 maxFeePerGas;
    uint256 maxPriorityFeePerGas;
    bytes paymasterAndData;
    bytes signature;
}

/**
 * Utility functions helpful when working with UserOperation structs.
 */
library UserOperationLib {
    function getSender(
        UserOperation calldata userOp
    ) internal pure returns (address) {
        address data;
        //read sender from userOp, which is first userOp member (saves 800 gas...)
        assembly {
            data := calldataload(userOp)
        }
        return address(uint160(data));
    }

    //relayer/block builder might submit the TX with higher priorityFee, but the user should not
    // pay above what he signed for.
    function gasPrice(
        UserOperation calldata userOp
    ) internal view returns (uint256) {
        unchecked {
            uint256 maxFeePerGas = userOp.maxFeePerGas;
            uint256 maxPriorityFeePerGas = userOp.maxPriorityFeePerGas;
            if (maxFeePerGas == maxPriorityFeePerGas) {
                //legacy mode (for networks that don't support basefee opcode)
                return maxFeePerGas;
            }
            return min(maxFeePerGas, maxPriorityFeePerGas + block.basefee);
        }
    }

    function pack(
        UserOperation calldata userOp
    ) internal pure returns (bytes memory ret) {
        address sender = getSender(userOp);
        uint256 nonce = userOp.nonce;
        bytes32 hashInitCode = calldataKeccak(userOp.initCode);
        bytes32 hashCallData = calldataKeccak(userOp.callData);
        uint256 callGasLimit = userOp.callGasLimit;
        uint256 verificationGasLimit = userOp.verificationGasLimit;
        uint256 preVerificationGas = userOp.preVerificationGas;
        uint256 maxFeePerGas = userOp.maxFeePerGas;
        uint256 maxPriorityFeePerGas = userOp.maxPriorityFeePerGas;
        bytes32 hashPaymasterAndData = calldataKeccak(userOp.paymasterAndData);

        return
            abi.encode(
                sender,
                nonce,
                hashInitCode,
                hashCallData,
                callGasLimit,
                verificationGasLimit,
                preVerificationGas,
                maxFeePerGas,
                maxPriorityFeePerGas,
                hashPaymasterAndData
            );
    }

    function hash(
        UserOperation calldata userOp
    ) internal pure returns (bytes32) {
        return keccak256(pack(userOp));
    }

    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }
}