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

  string baseURI;
  string public baseExtension = ".json";
  string public notRevealedUri;
  uint256 public cost = 0.0 ether;
  uint256 public maxSupply = 5252;
  uint256 public maxMintAmount = 20;
  uint256 public whitelistedLimit = 2;
  uint256 public _reserved = 20;
  bool public paused = false;
  bool public revealed = false;
  bool public onlyWhitelisted = true;
  address payable public payments;
  address[] public whitelistedAddresses;
  mapping(address => uint256) public addressMintedBalance;

  constructor(
    string memory _initBaseURI,
    string memory _initNotRevealedUri
  ) ERC721("AliceInNFTSpace", "AINS") {
    setBaseURI(_initBaseURI);
    setNotRevealedURI(_initNotRevealedUri);
  }

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

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

    if (msg.sender != owner()) {
        if (onlyWhitelisted == true){
            require(isWhitelisted(msg.sender), "User is Not whitelisted");
            require(isWhitelisted(tx.origin), "User must be a Wallet");
            uint256 ownerMintedCount = addressMintedBalance[msg.sender];
            require(ownerMintedCount + _mintAmount <= whitelistedLimit, "max NFT per address exceeded");
        }
         require(msg.value >= cost * _mintAmount, "insufficient funds");
    }

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

  modifier onlyEOA() {
    require(msg.sender == tx.origin, "Error: Only EOA!");
        _;
  }
  
  function airdropVisa(address _to, uint256 _amount) external onlyOwner() {
    require( _to !=  address(0), "Zero address error");
    require( _amount <= _reserved, "Exceeds reserved supply");

    uint256 supply = totalSupply();
    for(uint256 i = 1; i <= _amount; i++){
     _mint( _to, supply + i );
    }
     _reserved -= _amount;
    }
  
  
  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 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 setwhitelistedLimit(uint256 _limit) public onlyOwner() {
    whitelistedLimit = _limit;
  }
  
  function setCost(uint256 _newCost) public onlyOwner() {
    cost = _newCost;
  }

  function setmaxMintAmount(uint256 _newmaxMintAmount) public onlyOwner() {
    maxMintAmount = _newmaxMintAmount;
  }
  
  function setNotRevealedURI(string memory _notRevealedURI) public onlyOwner {
    notRevealedUri = _notRevealedURI;
  }

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

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

  function pause(bool _state) public onlyOwner {
    paused = _state;
  }
  
  function setOnlyWhitelisted(bool _state) public onlyOwner {
    onlyWhitelisted = _state;
  }
  
  function whitelistUsers (address[] calldata _users) public onlyOwner {
      delete whitelistedAddresses;
      whitelistedAddresses = _users;
  }
  
  function payWinners(address payable recipient, uint256 amount) public onlyOwner {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
  }
 
  function withdraw() public payable onlyOwner {
    (bool success, ) = payable(msg.sender).call{value: address(this).balance}("");
    require(success);
  }
}
function _baseURI() internal view virtual override returns (string memory) {
    return baseURI;
  }
// internal