/// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import {ReentrancyGuard} from "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

contract BatchETHTransfer is ReentrancyGuard {
    /**
     * @dev Emitted when a batch ETH transfer operation is completed.
     * @param sender The address initiating the batch transfer.
     * @param numTransfers The number of individual transfers requested in the batch.
     * @param totalAmountSent The sum of intended amounts sent by the caller.
     */
    event BatchETHTransferred(
        address indexed sender,
        uint256 numTransfers,
        uint256 totalAmountSent
    );

    /**
     * @dev Transfers ETH to multiple recipients in a single transaction.
     * @notice Caller must send the exact amount of ETH required for all transfers.
     * @notice This function is not suitable for use with tokens that do not support the SafeERC20 interface.
     * @notice This function limits the number of transfers to 200 to prevent block gas limits.
     * @param recipients An array of addresses to send ETH to.
     * @param amounts An array of amounts (in ETH) intended to send, corresponding to recipients.
     */
    function batchETHTransfer(
        address[] calldata recipients,
        uint256[] calldata amounts
    ) external payable nonReentrant {
        address sender = msg.sender;
        uint256 numTransfers = recipients.length;
        uint256 numAmounts = amounts.length;
        uint256 totalAmountSent = 0;

        require(numTransfers > 0, "BatchETHTransfer: empty transfer list");
        require(numTransfers <= 200, "BatchETHTransfer: too many transfers");
        require(
            numTransfers == numAmounts,
            "BatchETHTransfer: recipients and amounts length mismatch"
        );

        for (uint256 i = 0; i < numTransfers; i++) {
            address recipient = recipients[i];
            uint256 amount = amounts[i];

            require(
                recipient != address(0),
                "BatchETHTransfer: recipient cannot be zero address"
            );
            require(amount > 0, "BatchETHTransfer: amount must be positive");
            require(
                sender != recipient,
                "BatchETHTransfer: sender and recipient cannot be the same"
            );

            totalAmountSent += amount;
        }

        require(
            msg.value == totalAmountSent,
            "BatchETHTransfer: incorrect ETH amount sent"
        );

        for (uint256 i = 0; i < numTransfers; i++) {
            address recipient = recipients[i];
            uint256 amount = amounts[i];

            payable(recipient).transfer(amount);
        }

        emit BatchETHTransferred(sender, numTransfers, totalAmountSent);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant NOT_ENTERED = 1;
    uint256 private constant ENTERED = 2;

    uint256 private _status;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    constructor() {
        _status = NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        _status = ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == ENTERED;
    }
}

{
  "compilationTarget": {
    "contracts/BatchETHTransfer.sol": "BatchETHTransfer"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}