contract PXF is ERC721Enumerable, Ownable {
    using Strings for uint256;

    string public baseURI;
    string public baseExtension = ".json";
    string public notRevealedUri;
    uint256 public cost = 0 ether;
    uint256 public maxSupply = 5555;
    uint256 public maxMintAmount = 25;
    uint256 public nftPerAddressLimit = 25;
    bool public paused = false;
    bool public revealed = false;
    mapping(address => uint256) public addressMintedBalance;

    constructor(
        string memory _name,
        string memory _symbol,
        string memory _initBaseURI,
        string memory _initNotRevealedUri
    ) ERC721(_name, _symbol) {
        setBaseURI(_initBaseURI);
        setNotRevealedURI(_initNotRevealedUri);
    }

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

    // public
    function mint(uint256 _mintAmount) public payable {
        require(!paused, "the contract is paused");
        uint256 supply = totalSupply();
        require(_mintAmount > 0, "need to mint at least 1 NFT");
        require(
            _mintAmount <= maxMintAmount,
            "max mint amount per session exceeded"
        );
        require(supply + _mintAmount <= maxSupply, "max NFT limit exceeded");

        if (msg.sender != owner()) {
            uint256 ownerMintedCount = addressMintedBalance[msg.sender];
            require(
                ownerMintedCount + _mintAmount <= nftPerAddressLimit,
                "max NFT per address exceeded"
            );
            require(msg.value >= cost * _mintAmount, "insufficient funds");
        }

        for (uint256 i = 1; i <= _mintAmount; i++) {
            addressMintedBalance[msg.sender]++;
            _safeMint(msg.sender, supply + i);
        }
    }

    function walletOfOwner(address _owner)
        public
        view
        returns (uint256[] memory)
    {
        uint256 ownerTokenCount = balanceOf(_owner);
        uint256[] memory tokenIds = new uint256[](ownerTokenCount);
        for (uint256 i; i < ownerTokenCount; i++) {
            tokenIds[i] = tokenOfOwnerByIndex(_owner, i);
        }
        return tokenIds;
    }

    function tokenURI(uint256 tokenId)
        public
        view
        virtual
        override
        returns (string memory)
    {
        require(
            _exists(tokenId),
            "ERC721Metadata: URI query for nonexistent token"
        );

        if (revealed == false) {
            return notRevealedUri;
        }

        string memory currentBaseURI = _baseURI();
        return
            bytes(currentBaseURI).length > 0
                ? string(
                    abi.encodePacked(
                        currentBaseURI,
                        tokenId.toString(),
                        baseExtension
                    )
                )
                : "";
    }

    //only owner
    function reveal() public onlyOwner {
        revealed = true;
    }

    function setNftPerAddressLimit(uint256 _limit) public onlyOwner {
        nftPerAddressLimit = _limit;
    }

    function setCost(uint256 _newCost) public onlyOwner {
        cost = _newCost;
    }

    function setmaxMintAmount(uint256 _newmaxMintAmount) public onlyOwner {
        maxMintAmount = _newmaxMintAmount;
    }

    function setBaseURI(string memory _newBaseURI) public onlyOwner {
        baseURI = _newBaseURI;
    }

    function setNotRevealedURI(string memory _notRevealedURI) public onlyOwner {
        notRevealedUri = _notRevealedURI;
    }

    function pause(bool _state) public onlyOwner {
        paused = _state;
    }

    function withdraw() public payable onlyOwner {
        (bool os, ) = payable(owner()).call{value: address(this).balance}("");
        require(os);
    }
}
function mint(uint256 _mintAmount) public payable {
    require(!paused, "the contract is paused");
    uint256 supply = totalSupply();
    require(_mintAmount > 0, "need to mint at least 1 NFT");
    require(
        _mintAmount <= maxMintAmount,
        "max mint amount per session exceeded"
    );
    require(supply + _mintAmount <= maxSupply, "max NFT limit exceeded");

    if (msg.sender != owner()) {
        uint256 ownerMintedCount = addressMintedBalance[msg.sender];
        require(
            ownerMintedCount + _mintAmount <= nftPerAddressLimit,
            "max NFT per address exceeded"
        );
        require(msg.value >= cost * _mintAmount, "insufficient funds");
    }

    for (uint256 i = 1; i <= _mintAmount; i++) {
        addressMintedBalance[msg.sender]++;
        _safeMint(msg.sender, supply + i);
    }
}

// public