// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract BillionaireLandFractalBitcoin {

    // State variables
    string public constant name = "BillionaireLand Fractal Bitcoin";
    string public constant symbol = "BLFB";
    uint8 public constant decimals = 18;
    uint256 public totalSupply;

    mapping(address => uint256) balances;
    mapping(address => mapping(address => uint256)) allowed;

    // Events
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    constructor(uint256 _totalSupply) {
        totalSupply = _totalSupply;
        balances[msg.sender] = _totalSupply;
    }

    // Transfer function
    function transfer(address _to, uint256 _value) public returns (bool) {
        require(_to != address(0), "Invalid address");
        require(_value <= balances[msg.sender], "Insufficient balance");

        balances[msg.sender] -= _value;
        balances[_to] += _value;
        emit Transfer(msg.sender, _to, _value);
        return true;
    }

    // Allowance function
    function approve(address _spender, uint256 _value) public returns (bool) {
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    // Transfer from function
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
        require(_to != address(0), "Invalid address");
        require(_value <= balances[_from], "Insufficient balance");
        require(_value <= allowed[_from][msg.sender], "Allowance exceeded");

        balances[_from] -= _value;
        balances[_to] += _value;
        allowed[_from][msg.sender] -= _value;
        emit Transfer(_from, _to, _value);
        return true;
    }

    // Balance of function
    function balanceOf(address _owner) public view returns (uint256) {
        return balances[_owner];
    }

    // Allowance function
    function allowance(address _owner, address _spender) public view returns (uint256) {
        return allowed[_owner][_spender];
    }

    // Additional features for digital twins and smart contract encoding
    struct DigitalTwin {
        address owner;
        string metadata;
        string smartContractData;
    }

    mapping(uint256 => DigitalTwin) public digitalTwins;

    event DigitalTwinAdded(uint256 indexed twinId, address indexed owner, string metadata, string smartContractData);

    function addDigitalTwin(uint256 twinId, address owner, string memory metadata, string memory smartContractData) public {
        digitalTwins[twinId] = DigitalTwin(owner, metadata, smartContractData);
        emit DigitalTwinAdded(twinId, owner, metadata, smartContractData);
    }

    // Custom features for Quantum Lynx integration and fractal design
    string public constant quantumLynxMessage = "In Quantum We Trust";

    function getQuantumLynxMessage() public pure returns (string memory) {
        return quantumLynxMessage;
    }

    // Metadata about fractal pattern and unique attributes
    struct FractalMetadata {
        string pattern;
        string uniqueAttributes;
    }

    mapping(uint256 => FractalMetadata) public fractalMetadata;

    event FractalMetadataAdded(uint256 indexed twinId, string pattern, string uniqueAttributes);

    function setFractalMetadata(uint256 twinId, string memory pattern, string memory uniqueAttributes) public {
        fractalMetadata[twinId] = FractalMetadata(pattern, uniqueAttributes);
        emit FractalMetadataAdded(twinId, pattern, uniqueAttributes);
    }

    function getFractalMetadata(uint256 twinId) public view returns (FractalMetadata memory) {
        return fractalMetadata[twinId];
    }

    // Advanced security features
    modifier onlyOwner(uint256 twinId) {
        require(digitalTwins[twinId].owner == msg.sender, "Not the owner");
        _;
    }

    function transferTwinOwnership(uint256 twinId, address newOwner) public onlyOwner(twinId) {
        digitalTwins[twinId].owner = newOwner;
    }
    
    function updateSmartContractData(uint256 twinId, string memory newSmartContractData) public onlyOwner(twinId) {
        digitalTwins[twinId].smartContractData = newSmartContractData;
    }

    function updateFractalMetadata(uint256 twinId, string memory newPattern, string memory newUniqueAttributes) public onlyOwner(twinId) {
        fractalMetadata[twinId] = FractalMetadata(newPattern, newUniqueAttributes);
    }
}