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

/**
 * @notice Modified from https://github.com/safe-global/safe-contracts/blob/main/contracts/libraries/MultiSend.sol
 *
 * @dev Modification was to ensure this is called from an EOA, rather than enforcing the
 * `delegatecall` usage as in the original contract.
 */
contract MultiSend {
  address private immutable multisendSingleton;

  constructor() {
    multisendSingleton = address(this);
  }

  /**
   * @dev Sends multiple transactions and reverts all if one fails.
   * @param transactions Encoded transactions. Each transaction is encoded as a packed bytes of
   *                     operation as a uint8 with 0 for a call or 1 for a delegatecall (=> 1 byte),
   *                     to as a address (=> 20 bytes),
   *                     value as a uint256 (=> 32 bytes),
   *                     data length as a uint256 (=> 32 bytes),
   *                     data as bytes.
   *                     see abi.encodePacked for more information on packed encoding
   */
  function multiSend(bytes memory transactions) public payable {
    require(msg.sender.code.length == 0, "MultiSend should only be called via EOA");
    // solhint-disable-next-line no-inline-assembly
    assembly {
      let length := mload(transactions)
      let i := 0x20
      for {
        // Pre block is not used in "while mode"
      } lt(i, length) {
        // Post block is not used in "while mode"
      } {
        // First byte of the data is the operation.
        // We shift by 248 bits (256 - 8 [operation byte]) it right since mload will always load 32 bytes (a word).
        // This will also zero out unused data.
        let operation := shr(0xf8, mload(add(transactions, i)))
        // We offset the load address by 1 byte (operation byte)
        // We shift it right by 96 bits (256 - 160 [20 address bytes]) to right-align the data and zero out unused data.
        let to := shr(0x60, mload(add(transactions, add(i, 0x01))))
        // We offset the load address by 21 byte (operation byte + 20 address bytes)
        let value := mload(add(transactions, add(i, 0x15)))
        // We offset the load address by 53 byte (operation byte + 20 address bytes + 32 value bytes)
        let dataLength := mload(add(transactions, add(i, 0x35)))
        // We offset the load address by 85 byte (operation byte + 20 address bytes + 32 value bytes + 32 data length bytes)
        let data := add(transactions, add(i, 0x55))
        let success := 0
        switch operation
        case 0 {
          success := call(gas(), to, value, data, dataLength, 0, 0)
        }
        case 1 {
          success := delegatecall(gas(), to, data, dataLength, 0, 0)
        }
        if eq(success, 0) {
          revert(0, 0)
        }
        // Next entry starts at 85 byte + data length
        i := add(i, add(0x55, dataLength))
      }
    }
  }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"bytes","name":"transactions","type":"bytes"}],"name":"multiSend","outputs":[],"stateMutability":"payable","type":"function"}]

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