// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}


pragma solidity ^0.8.15;


contract HiddenCryptography is ERC721A, DefaultOperatorFilterer, Ownable {

    string public baseURI = "ipfs://QmRAv2hXRyeRtPZpBQgbzkHPR2qS3GYbFbTDAKxeusYJSc/";  
    string public baseExtension = ".json";
    uint256 public price = 0.025 ether;
    uint256 public maxSupply = 999;
    uint256 public maxPerTransaction = 20; 

    modifier callerIsUser() {
        require(tx.origin == msg.sender, "The caller is another contract");
        _;
    }
    constructor () ERC721A("999 HIDDEN CRYPTOGRAPHY - PHASE 1", "HCP1") {
    }

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

    // Mint
    function publicMint(uint256 amount) public payable callerIsUser{
        require(amount <= maxPerTransaction, "Over Max Per Transaction!");
        require(totalSupply() + amount <= maxSupply, "Sold Out!");
        uint256 mintAmount = amount;
        
        if (totalSupply() % 2 != 0 ) {
            mintAmount--;
        }

        require(msg.value > 0 || mintAmount == 0, "Insufficient Value!");
        if (msg.value >= price * mintAmount) {
            _safeMint(msg.sender, amount);
        }
    }    

    /////////////////////////////
    // CONTRACT MANAGEMENT 
    /////////////////////////////

    function setPrice(uint256 newPrice) public onlyOwner {
        price = newPrice;
    }

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

    function withdraw() public onlyOwner {
		payable(msg.sender).transfer(address(this).balance);
        
	}
    
    function setBaseURI(string memory baseURI_) external onlyOwner {
        baseURI = baseURI_;
    } 

    /////////////////////////////
    // OPENSEA FILTER REGISTRY 
    /////////////////////////////

    function setApprovalForAll(address operator, bool approved) public override onlyAllowedOperatorApproval(operator) {
        super.setApprovalForAll(operator, approved);
    }

    function approve(address operator, uint256 tokenId) public payable override onlyAllowedOperatorApproval(operator) {
        super.approve(operator, tokenId);
    }

    function transferFrom(address from, address to, uint256 tokenId) public payable override onlyAllowedOperator(from) {
        super.transferFrom(from, to, tokenId);
    }

    function safeTransferFrom(address from, address to, uint256 tokenId) public payable override onlyAllowedOperator(from) {
        super.safeTransferFrom(from, to, tokenId);
    }

    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data)
        public
        payable
        override
        onlyAllowedOperator(from)
    {
        super.safeTransferFrom(from, to, tokenId, data);
    }
}
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