Transfers API

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

/// @title TransferMonitor - Track and log transfers for indexing
contract TransferMonitor {
    // Indexed transfer events for efficient querying
    event TokenTransfer(
        address indexed token,
        address indexed from,
        address indexed to,
        uint256 amount,
        uint256 timestamp
    );

    event NFTTransfer(
        address indexed collection,
        uint256 indexed tokenId,
        address indexed from,
        address to,
        uint256 timestamp
    );

    event NativeTransfer(
        address indexed from,
        address indexed to,
        uint256 amount,
        uint256 indexed blockNumber
    );

    // Log ERC20 transfer with metadata
    function logTokenTransfer(
        address token,
        address from,
        address to,
        uint256 amount
    ) external {
        emit TokenTransfer(token, from, to, amount, block.timestamp);
    }

    // Log NFT transfer
    function logNFTTransfer(
        address collection,
        uint256 tokenId,
        address from,
        address to
    ) external {
        emit NFTTransfer(collection, tokenId, from, to, block.timestamp);
    }

    // Transfer ETH and emit event
    function transferWithLog(address payable to) external payable {
        to.transfer(msg.value);
        emit NativeTransfer(msg.sender, to, msg.value, block.number);
    }

    // Batch transfer ERC20 tokens
    function batchTransfer(
        address token,
        address[] calldata recipients,
        uint256[] calldata amounts
    ) external {
        require(recipients.length == amounts.length, "Length mismatch");
        for (uint256 i = 0; i < recipients.length; i++) {
            IERC20(token).transferFrom(msg.sender, recipients[i], amounts[i]);
            emit TokenTransfer(token, msg.sender, recipients[i], amounts[i], block.timestamp);
        }
    }
}