contract MetaverseSecret is ERC721, Ownable {
    using Strings for uint256;

    string public baseURI;
    string public baseExtension = ".json";
    string public notRevealedUri;
    uint256 public cost = 0.069 ether;
    uint256 public costWL = 0.069 ether;
    uint256 public maxSupply = 6969;
    uint256 public maxMintAmount = 5;
    uint256 public nftPerAddressLimit = 5;
    uint256 allTokens = 0;
    bool public paused = true;
    bool public revealed = false;
    mapping(address => uint256) public addressMintedBalance;

    bool public onlyWhitelisted = true;
    address[] public whitelistedAddresses;


    constructor() ERC721("Metaverse's Secret", "MetaversesSecret") {
        setNotRevealedURI("ipfs://QmRrZ32LukLzNzCovtDmbKoX8hpAHvNP3Cep3uAUad8aqe");
    }

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

    function mint(uint256 _mintAmount) public payable {
        require(!paused, "the contract is paused");
        uint256 supply = totalSupply();

        if (msg.sender != owner()) {
            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"
            );
            uint256 ownerMintedCount = addressMintedBalance[msg.sender];
                require(
                    ownerMintedCount + _mintAmount < nftPerAddressLimit,
                    "max NFT per address exceeded"
                );
            if (onlyWhitelisted == true) {
                require(isWhitelisted(msg.sender), "user is not whitelisted");
                require(
                    msg.value >= costWL * _mintAmount,
                    "insufficient funds"
                );
            } else {
                require(msg.value >= cost * _mintAmount, "insufficient funds");
            }
        }

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

    function totalSupply() public view returns (uint256) {
        return allTokens;
    }

    function isWhitelisted(address _user) public view returns (bool) {
        for (uint256 i = 0; i < whitelistedAddresses.length; i++) {
            if (whitelistedAddresses[i] == _user) {
                return true;
            }
        }
        return false;
    }

    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()
                    )
                )
                : "";
    }

    //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 setBaseExtension(string memory _newBaseExtension)
        public
        onlyOwner
    {
        baseExtension = _newBaseExtension;
    }

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

    function pause() public onlyOwner {
        paused = true;
    }

    function unpause() public onlyOwner {
        paused = false;
    }

    function setOnlyWhitelisted() public onlyOwner {
        onlyWhitelisted = true;
    }

    function setPublic() public onlyOwner {
        onlyWhitelisted = false;
    }

    function whitelistUsers(address[] calldata _users) public onlyOwner {
        delete whitelistedAddresses;
        whitelistedAddresses = _users;
    }

    function withdraw() public payable onlyOwner {
        // This will payout the owner the contract balance.
        // Do not remove this otherwise you will not be able to withdraw the funds.
        // =============================================================================
        (bool os, ) = payable(owner()).call{value: address(this).balance}("");
        require(os);
        // =============================================================================
    }
}
function reveal() public onlyOwner {
    revealed = true;
}

//only owner