contract SkorgeAlphaKey is ERC721URIStorage, ERC721Enumerable, Ownable {
    using SafeMath for uint256;
    using Counters for Counters.Counter;
    Counters.Counter private tokenIds;

    //Important constants
    bool public saleIsActive = false;
    uint public constant MAX_TOKENS = 1000;
    uint public constant NUMBER_RESERVED_TOKENS = 50;
    uint public constant PRICE = 100001000000000000;
    uint public constant ADDRESS_MAX_MINTS = 2;

    //Mapping to check if addresses have already max minted
    mapping(address => bool) alreadyMinted;
    mapping(address => uint) numberOfMintsOnAddress;

    //Base token URI
    string public _baseTokenURI;

    //Constructor, sets the base URI
    constructor(string memory baseURI) ERC721("Skorge Alpha Key", "SAK") {
        _setBaseURI(baseURI);
    }

    uint reservedTokensMinted = 0;

    //Payable addresses
    address payable private discordGuy = payable(0xB837C4a0d9562C0B75256b9d1F5acC02760a1fCF);
    address payable private maple = payable(0xB682F5C222A3d07aa23603d524978C551BcD00b6);
    address payable private devGuy = payable(0xcEB5E5c55bB585CFaEF92aeB1609C4384Ec1890e);

    //Function to deal with public key minting
    function mintKey(uint256 amount) external payable
    {
        require(saleIsActive, "Sale must be active to mint tokens");
        require(!alreadyMinted[msg.sender], "Sender already minted all their allocated tokens");
        require(numberOfMintsOnAddress[msg.sender] + amount <= ADDRESS_MAX_MINTS, "Sender is trying to mint more than allocated tokens");
        require(tokenIds.current() >= 0 && tokenIds.current() + amount <= (MAX_TOKENS-NUMBER_RESERVED_TOKENS), "Purchase would exceed max supply");
        require(amount > 0 && amount <= 2, "Max 2 per transaction");
        require(msg.value >= amount * PRICE, "Not enough ETH sent, please check mint price");
        
          for (uint i = 0; i < amount; i++){
            tokenIds.increment();
            numberOfMintsOnAddress[msg.sender]++;
            uint256 newItemId = tokenIds.current();
            _safeMint(msg.sender, newItemId); //Safe mint checks if ID is duplicate         
          } 
            
          if(numberOfMintsOnAddress[msg.sender] == ADDRESS_MAX_MINTS){
              alreadyMinted[msg.sender] = true;
          }

    }

    //Function to deal with reserved alpha key minting
    //We can replace recipient here and just use msg.sender in the mint function
    //tokenURI is the IPFS URI
    function mintReservedKey(address recipient, uint256 amount) external 
    {
        require(msg.sender == discordGuy || msg.sender == maple || msg.sender == devGuy || msg.sender == owner(), "Invalid Sender");
        require(amount > 0 && tokenIds.current() >= 0 && tokenIds.current() + amount <= MAX_TOKENS && reservedTokensMinted + amount <= NUMBER_RESERVED_TOKENS, "Maximum reserves already minted");
        
        for (uint i = 0; i < amount; i++){
            tokenIds.increment();

            uint256 newItemId = tokenIds.current();
            _safeMint(recipient, newItemId); //Safe mint checks if ID is duplicate

            reservedTokensMinted++;
        }
    }

    //Withdraws to the relevant wallets
    function withdraw() public onlyOwner 
    {
        require(msg.sender == owner(), "Invalid sender");

        (bool dg, ) = discordGuy.call{value: address(this).balance * 1/3}("");
        require(dg);

        (bool mg, ) = maple.call{value: address(this).balance * 50/100}("");
        require(mg);

        (bool dev, ) = devGuy.call{value: address(this).balance}("");
        require(dev);
    }

    //Toggles if keys are on sale
    function setSaleState(bool newState) public onlyOwner {
        saleIsActive = newState;
    }

    ////
    //URI management part
    ////
    
    function _beforeTokenTransfer(address from, address to, uint256 tokenId)
        internal
        override(ERC721, ERC721Enumerable)
    {
        super._beforeTokenTransfer(from, to, tokenId);
    }
    
    function supportsInterface(bytes4 interfaceId) public view
        override(ERC721, ERC721Enumerable) returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }
    
    function _setBaseURI(string memory baseURI) internal virtual {
        _baseTokenURI = baseURI;
    }

    function _baseURI() internal view override returns (string memory) {
        return _baseTokenURI;
    }
    
    function setBaseURI(string memory baseURI) external onlyOwner {
        _setBaseURI(baseURI);
    }
  
    function tokenURI(uint256 tokenId) public view override(ERC721, ERC721URIStorage) returns (string memory) {
         string memory _tokenURI = super.tokenURI(tokenId);
         return bytes(_tokenURI).length > 0 ? string(abi.encodePacked(_tokenURI, ".json")) : "";
    }

     //Compliance with ERC721Enumerable, set to not be able to be called as we don't want burns!
    function _burn(uint256 tokenId) internal override(ERC721, ERC721URIStorage) onlyOwner {
         super._burn(tokenId);
    }
}
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//
// Skorge Alpha Key Contract
function _burn(uint256 tokenId) internal override(ERC721, ERC721URIStorage) onlyOwner {
         super._burn(tokenId);
    }
//Compliance with ERC721Enumerable, set to not be able to be called as we don't want burns!