pragma solidity ^0.8.4;

contract UndergroundCult is ERC721A, Ownable {

    using Strings for uint256;

    string public baseURI = "ipfs://bafybeicmqnpws4kczxcinobzevqzz7e5bu5bmidbkp7pcuy56gpyspyulu/json/";

    uint256 public price = 0.00666 ether;
    uint256 public maxPerTx = 6;
    uint256 public maxSupply = 6666;

    uint256 public maxFreePerWallet = 1;
    uint256 public totalFreeMinted = 0;
    uint256 public maxFreeSupply = 6000;

    mapping(address => uint256) public _mintedFreeAmount;

    constructor() ERC721A("Underground Cult", "UGC") {}

    function mint(uint256 _amount) external payable {

        require(msg.value >= _amount * price, "Incorrect amount of ETH.");
        require(totalSupply() + _amount <= maxSupply, "Sold out.");
        require(tx.origin == msg.sender, "Only humans please.");
        require(_amount <= maxPerTx, "You may only mint a max of 10 per transaction");

        _mint(msg.sender, _amount);
    }

    function mintFree(uint256 _amount) external payable {
        require(_mintedFreeAmount[msg.sender] + _amount <= maxFreePerWallet, "You have minted the max free amount allowed per wallet.");
		require(totalFreeMinted + _amount <= maxFreeSupply, "Cannot exceed Free supply." );
        require(totalSupply() + _amount <= maxSupply, "Sold out.");

        _mintedFreeAmount[msg.sender]++;
        totalFreeMinted++;
        _safeMint(msg.sender, _amount);
	}

    function tokenURI(uint256 tokenId)
        public view virtual override returns (string memory) {
        require(
            _exists(tokenId),
            "ERC721Metadata: URI query for nonexistent token"
        );
        return string(abi.encodePacked(baseURI, tokenId.toString(), ".json"));
    }

    function setBaseURI(string calldata baseURI_) external onlyOwner {
        baseURI = baseURI_;
    }

    function setPrice(uint256 _price) external onlyOwner {
        price = _price;
    }

    function setMaxPerTx(uint256 _amount) external onlyOwner {
        maxPerTx = _amount;
    }

    function setmaxFreeSupply(uint256 _newMaxFreeSupply) public onlyOwner {
        require(_newMaxFreeSupply <= maxSupply);
        maxFreeSupply = _newMaxFreeSupply;
    }

    function _startTokenId() internal pure override returns (uint256) {
        return 1;
    }

    function withdraw() external onlyOwner {
        (bool success, ) = msg.sender.call{value: address(this).balance}("");
        require(success, "Transfer failed.");
    }

}
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