Contract Source Code:

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

contract SimpleICO {
    address public owner;
    uint256 public tokenPrice = 0.001 ether;
    uint256 public tokensSold;
    uint256 public constant TOTAL_SUPPLY = 1000000 * 10**18; // 1 million tokens
    
    mapping(address => uint256) public balances;
    
    event TokensPurchased(address buyer, uint256 amount);
    
    constructor() {
        owner = msg.sender;
        balances[address(this)] = TOTAL_SUPPLY;
    }
    
    modifier onlyOwner() {
        require(msg.sender == owner, "Only owner can call this function");
        _;
    }
    
    function buyTokens() public payable {
        require(msg.value > 0, "Send ETH to buy tokens");
        require(balances[address(this)] > 0, "No tokens available");
        
        uint256 tokenAmount = (msg.value * 10**18) / tokenPrice;
        require(tokenAmount <= balances[address(this)], "Not enough tokens available");
        
        balances[address(this)] -= tokenAmount;
        balances[msg.sender] += tokenAmount;
        tokensSold += tokenAmount;
        
        emit TokensPurchased(msg.sender, tokenAmount);
    }
    
    function withdrawFunds() public onlyOwner {
        (bool success, ) = owner.call{value: address(this).balance}("");
        require(success, "Payment failed.");
    }
    
    function getBalance(address account) public view returns (uint256) {
        return balances[account];
    }
    
    function getRemainingTokens() public view returns (uint256) {
        return balances[address(this)];
    }
}