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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

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

contract NFTPresale is ERC721, Ownable {

IERC20 public erc20Token;
    uint256 public _nextTokenId;
    uint256 public price;
    uint256 public priceInNative;

constructor(address initialOwner, address _erc20Token, uint256 _price)
    ERC721("NAME_OF_TOKEN", "NOT")
    Ownable(initialOwner)
    {
        erc20Token = IERC20(_erc20Token);
        price = _price;
    }

function _safeMint(address to) internal {
        uint256 tokenId = _nextTokenId++;
        _safeMint(to, tokenId);
    }

function preSaleMintWithERC20Token() public onlyOwner {
        // transfer erc20
        require(erc20Token.transferFrom(msg.sender, address(this), price), "ERC20: transfer failed");

// mint nft
        _safeMint(msg.sender);
    }

function preSaleMintWithNativeToken() public payable onlyOwner {
        // transfer native
        require(msg.value >= priceInNative, "Insufficient native token amount");

// mint nft
        _safeMint(msg.sender);
    }

function withdrawFunds(address payable to, uint256 amount, IERC20 token) public onlyOwner {
        require(token.transfer(to, amount), "ERC20 transfer failed");
    }

function withdrawNativeFunds(address payable to, uint256 amount) public onlyOwner {
        require(amount <= address(this).balance, "Insufficient balance");
        to.transfer(amount);
    }

}