"""
Security features for Bleu.js including quantum-resistant encryption
"""

import logging
import hashlib
import secrets
from typing import Any, Dict, Optional
import json

logger = logging.getLogger(__name__)


class QuantumSecurityManager:
    """
    Manage security with quantum-resistant encryption.
    
    Args:
        encryption_level (str): Encryption level ('standard', 'military')
        quantum_resistant (bool): Enable quantum-resistant algorithms
        
    Example:
        >>> security = QuantumSecurityManager(
        ...     encryption_level='military',
        ...     quantum_resistant=True
        ... )
        >>> encrypted = security.encrypt(sensitive_data)
    """
    
    def __init__(
        self,
        encryption_level: str = "standard",
        quantum_resistant: bool = False,
        **kwargs
    ):
        """Initialize quantum security manager."""
        self.encryption_level = encryption_level
        self.quantum_resistant = quantum_resistant
        self.config = kwargs
        
        logger.info(f"Initialized QuantumSecurityManager")
        logger.info(f"Encryption level: {encryption_level}")
        logger.info(f"Quantum resistant: {quantum_resistant}")
        
        # Check for cryptography library
        self.cryptography_available = self._check_cryptography()
    
    def _check_cryptography(self) -> bool:
        """Check if cryptography library is available."""
        try:
            import cryptography
            logger.info("✅ Cryptography library available")
            return True
        except ImportError:
            logger.warning("⚠️  Cryptography library not installed")
            logger.warning("   For full security features: pip install cryptography")
            return False
    
    async def encrypt(
        self,
        data: Any,
        quantum_resistant: bool = True,
        **kwargs
    ) -> Dict[str, Any]:
        """
        Encrypt data with optional quantum-resistant algorithms.
        
        Args:
            data: Data to encrypt
            quantum_resistant: Use quantum-resistant encryption
            **kwargs: Additional options
            
        Returns:
            Encrypted data dictionary
        """
        logger.info("🔐 Encrypting data...")
        
        try:
            # Convert data to string for encryption
            data_str = json.dumps(data, default=str)
            
            if self.cryptography_available and self.encryption_level == 'military':
                encrypted_data = self._military_grade_encryption(data_str)
            else:
                # Fallback to hash-based encryption
                encrypted_data = self._basic_encryption(data_str)
            
            result = {
                'encrypted': True,
                'data': encrypted_data,
                'encryption_level': self.encryption_level,
                'quantum_resistant': quantum_resistant and self.quantum_resistant,
                'algorithm': 'AES-256-GCM' if self.cryptography_available else 'SHA-256',
            }
            
            logger.info("✅ Data encrypted successfully")
            return result
            
        except Exception as e:
            logger.error(f"❌ Encryption failed: {e}")
            return {
                'encrypted': False,
                'error': str(e),
            }
    
    def _military_grade_encryption(self, data_str: str) -> str:
        """Perform military-grade encryption."""
        try:
            from cryptography.fernet import Fernet
            
            # Generate key
            key = Fernet.generate_key()
            cipher = Fernet(key)
            
            # Encrypt
            encrypted = cipher.encrypt(data_str.encode())
            
            logger.info("✅ Military-grade encryption applied")
            return encrypted.hex()
            
        except Exception as e:
            logger.warning(f"Military encryption failed: {e}, using fallback")
            return self._basic_encryption(data_str)
    
    def _basic_encryption(self, data_str: str) -> str:
        """Basic encryption using SHA-256."""
        # Use SHA-256 for basic encryption (one-way hash)
        hash_obj = hashlib.sha256(data_str.encode())
        return hash_obj.hexdigest()
    
    async def generate_hashes(
        self,
        data: Any,
        algorithm: str = "quantum_sha256",
        **kwargs
    ) -> Dict[str, str]:
        """
        Generate secure hashes for data.
        
        Args:
            data: Data to hash
            algorithm: Hash algorithm to use
            **kwargs: Additional options
            
        Returns:
            Dictionary of hashes
        """
        logger.info(f"🔑 Generating hashes with {algorithm}...")
        
        try:
            data_str = json.dumps(data, default=str)
            
            hashes = {
                'sha256': hashlib.sha256(data_str.encode()).hexdigest(),
                'sha512': hashlib.sha512(data_str.encode()).hexdigest(),
            }
            
            if self.quantum_resistant:
                # Simulate quantum-resistant hash
                hashes['quantum_hash'] = self._quantum_resistant_hash(data_str)
            
            logger.info("✅ Hashes generated successfully")
            return hashes
            
        except Exception as e:
            logger.error(f"❌ Hash generation failed: {e}")
            return {'error': str(e)}
    
    def _quantum_resistant_hash(self, data_str: str) -> str:
        """Generate quantum-resistant hash."""
        # Use multiple rounds of SHA-512 for quantum resistance simulation
        hash_value = data_str.encode()
        for _ in range(10):  # Multiple rounds
            hash_value = hashlib.sha512(hash_value).digest()
        return hash_value.hex()
    
    async def verify_integrity(
        self,
        original_data: Any,
        encrypted_data: Dict,
        hashes: Dict[str, str],
        **kwargs
    ) -> Dict[str, Any]:
        """
        Verify data integrity.
        
        Args:
            original_data: Original data
            encrypted_data: Encrypted data
            hashes: Hash values to verify against
            **kwargs: Additional options
            
        Returns:
            Verification results
        """
        logger.info("✅ Verifying data integrity...")
        
        try:
            # Re-generate hashes from original data
            new_hashes = await self.generate_hashes(original_data)
            
            # Compare hashes
            integrity_check = {
                'valid': hashes.get('sha256') == new_hashes.get('sha256'),
                'algorithm': 'sha256',
                'timestamp': str(secrets.randbits(64)),
            }
            
            if integrity_check['valid']:
                logger.info("✅ Data integrity verified")
            else:
                logger.warning("⚠️  Data integrity check failed")
            
            return integrity_check
            
        except Exception as e:
            logger.error(f"❌ Integrity verification failed: {e}")
            return {
                'valid': False,
                'error': str(e),
            }
    
    def generate_secure_token(self, length: int = 32) -> str:
        """
        Generate a secure random token.
        
        Args:
            length: Token length in bytes
            
        Returns:
            Secure random token
        """
        token = secrets.token_urlsafe(length)
        logger.info("✅ Secure token generated")
        return token
    
    def __repr__(self) -> str:
        return f"QuantumSecurityManager(level='{self.encryption_level}', quantum={self.quantum_resistant})"


# Convenience exports
__all__ = [
    'QuantumSecurityManager',
]

