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// SPDX-License-Identifier: LGPL-3.0-only
pragma solidity ^0.8.29;

/**
 * @title DfnsSmartAccount - This contract support batch execution of transactions.
 * The only storage is a nonce to prevent replay attacks.
 * The contract is intended to be used with EIP-7702 where EOA delegates to this contract.
 */
contract DfnsSmartAccount {
    struct Storage {
        uint256 nonce;
    }

    // keccak256("DfnsSmartAccount") & (~0xff)
    bytes32 private constant _STORAGE = 0x10ee8db8a0021e326896fcf9b44ce61becefe5f52e3dfd0bb294aee9b73bc000;
    // keccak256("EIP712Domain(uint256 chainId,address verifyingContract)");
    bytes32 private constant _DOMAIN_TYPEHASH = 0x47e79534a245952e8b16893a336b85a3d9ea9fa8c573f3d803afb92a79469218;
    // keccak256("HandleOps(bytes32 data,uint256 nonce)")
    bytes32 private constant _HANDLEOPS_TYPEHASH = 0x4f8bb4631e6552ac29b9d6bacf60ff8b5481e2af7c2104fe0261045fa6988111;

    address private immutable ENTRY_POINT;

    error InvalidSignature();

    /**
     * @dev Sends multiple transactions with signature validation and reverts all if one fails.
     * @param userOps Encoded User Ops.
     * @param r The r part of the signature.
     * @param vs The v and s part of the signature.
     */
    function handleOps(bytes memory userOps, uint256 r, uint256 vs) public payable {
        Storage storage $ = _storage();
        uint256 nonce = $.nonce;

        // Calculate the hash of transactions data and nonce for signature verification
        bytes32 domainSeparator = keccak256(abi.encode(_DOMAIN_TYPEHASH, block.chainid, address(this)));
        bytes32 structHash = keccak256(abi.encode(_HANDLEOPS_TYPEHASH, keccak256(userOps), nonce));
        bytes32 digest = keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));

        // Verify the signature
        require(_isValidSignature(digest, r, vs), InvalidSignature());

        // Update nonce for the sender to prevent replay attacks
        unchecked {
            $.nonce = nonce + 1;
        }

        /* solhint-disable no-inline-assembly */
        assembly ("memory-safe") {
            let length := mload(userOps)
            let i := 0x20
            for {} lt(i, length) {} {
                let to := shr(0x60, mload(add(userOps, i)))
                let value := mload(add(userOps, add(i, 0x14)))
                let dataLength := mload(add(userOps, add(i, 0x34)))
                let data := add(userOps, add(i, 0x54))
                let success := call(gas(), to, value, data, dataLength, 0, 0)

                if eq(success, 0) {
                    returndatacopy(0, 0, returndatasize())
                    revert(0, returndatasize())
                }
                i := add(i, add(0x54, dataLength))
            }
        }
        /* solhint-enable no-inline-assembly */
    }

    /**
     * @dev Validates the signature by extracting `v` and `s` from `vs` and using `ecrecover`.
     * @param hash The hash of the signed data.
     * @param r The r part of the signature.
     * @param vs The v and s part of the signature combined.
     * @return bool True if the signature is valid, false otherwise.
     */
    function _isValidSignature(bytes32 hash, uint256 r, uint256 vs) internal view returns (bool) {
        unchecked {
            uint256 v = (vs >> 255) + 27;
            uint256 s = vs & 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff;

            return address(this) == ecrecover(hash, uint8(v), bytes32(r), bytes32(s));
        }
    }

    function _storage() private pure returns (Storage storage $) {
        assembly ("memory-safe") {
            $.slot := _STORAGE
        }
    }

    function getNonce() external view returns (uint256) {
        return _storage().nonce;
    }
}

{
  "remappings": [
    "forge-std/=lib/forge-std/src/"
  ],
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "cancun",
  "viaIR": false,
  "libraries": {}
}

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[{"inputs":[],"name":"InvalidSignature","type":"error"},{"inputs":[],"name":"getNonce","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"userOps","type":"bytes"},{"internalType":"uint256","name":"r","type":"uint256"},{"internalType":"uint256","name":"vs","type":"uint256"}],"name":"handleOps","outputs":[],"stateMutability":"payable","type":"function"}]

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