pragma solidity ^0.8.13;

contract GohanNFT is Ownable, ERC721A {
    uint256 public maxSupply = 2768;
    uint256 public maxFreeSupply = 1000;

    uint256 public maxPerTxDuringMint = 5;
    uint256 public maxPerAddressDuringMint = 20;
    uint256 public maxPerAddressDuringFreeMint = 2;

    uint256 public price = 0.0078 ether;
    bool public saleIsActive = false;

    address internal constant TEAM_ADDRESS =
        0x2530b1156De6aE90cE484cA699C9a382081B3cB3;

    string private _baseTokenURI;

    mapping(address => uint256) public freeMintedAmount;
    mapping(address => uint256) public mintedAmount;

    constructor() ERC721A("Gohan-kun", "GOHAN") {}

    modifier mintCompliance() {
        require(saleIsActive, "ERR: Sale is not active yet.");
        require(tx.origin == msg.sender, "ERR: Caller cannot be a contract.");
        _;
    }

    function mint(uint256 _quantity) external payable mintCompliance {
        require(msg.value >= price * _quantity, "ERR: Insufficient Fund.");
        require(
            maxSupply >= totalSupply() + _quantity,
            "ERR: Exceeds max supply."
        );
        uint256 _mintedAmount = mintedAmount[msg.sender];
        require(
            _mintedAmount + _quantity <= maxPerAddressDuringMint,
            "ERR: Exceeds max mints per address!"
        );
        require(
            _quantity > 0 && _quantity <= maxPerTxDuringMint,
            "ERR: Invalid mint amount."
        );
        mintedAmount[msg.sender] = _mintedAmount + _quantity;
        _safeMint(msg.sender, _quantity);
    }

    function freeMint(uint256 _quantity) external mintCompliance {
        require(
            maxFreeSupply >= totalSupply() + _quantity,
            "ERR: Exceeds max free supply."
        );
        uint256 _freeMintedAmount = freeMintedAmount[msg.sender];
        require(
            _freeMintedAmount + _quantity <= maxPerAddressDuringFreeMint,
            "ERR: Exceeds max free mints per address!"
        );
        freeMintedAmount[msg.sender] = _freeMintedAmount + _quantity;
        _safeMint(msg.sender, _quantity);
    }

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

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

    function setMaxPerAddress(uint256 _amount) external onlyOwner {
        maxPerAddressDuringMint = _amount;
    }

    function setMaxFreePerAddress(uint256 _amount) external onlyOwner {
        maxPerAddressDuringFreeMint = _amount;
    }

    function flipSale() public onlyOwner {
        saleIsActive = !saleIsActive;
    }

    function cutMaxSupply(uint256 _amount) public onlyOwner {
        require(
            maxSupply - _amount >= totalSupply(),
            "ERR: Supply cannot fall below minted tokens."
        );
        maxSupply -= _amount;
    }

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

    function _baseURI() internal view virtual override returns (string memory) {
        return _baseTokenURI;
    }

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

    function withdrawBalance() external payable onlyOwner {
        (bool success, ) = payable(TEAM_ADDRESS).call{
            value: address(this).balance
        }("");
        require(success, "ERR: transfer failed.");
    }
}
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