"""
Token-based security services.
"""

import logging
from typing import Any, Dict, Optional, Tuple

from django.db import models

from .base import BaseService

logger = logging.getLogger(__name__)


class TokenService(BaseService):
    """
    Service for token-based operations.
    """
    
    service_name = "token_service"
    
    def execute(self, operation: str, **kwargs) -> Any:
        """Execute token operation."""
        if operation == "validate":
            return self.validate_token(**kwargs)
        elif operation == "generate":
            return self.generate_token(**kwargs)
        elif operation == "revoke":
            return self.revoke_token(**kwargs)
        else:
            return super().execute(operation, **kwargs)
    
    def validate_token(
        self,
        token: str,
        action: str = "read",
        user_id: Optional[str] = None,
        **kwargs,
    ) -> Dict[str, Any]:
        """
        Validate token for action.
        """
        # Implement token validation logic
        # This should integrate with your authentication system
        
        try:
            # Example: Validate JWT token
            from jose import jwt, JWTError
            
            # Decode token
            payload = jwt.decode(
                token,
                "your-secret-key",  # Should be from settings
                algorithms=["HS256"],
            )
            
            # Check expiration
            import time
            if payload.get("exp", 0) < time.time():
                return {"valid": False, "error": "Token expired"}
            
            # Check action permission
            token_action = payload.get("action", "read")
            if action != "read" and token_action != action:
                return {"valid": False, "error": "Insufficient permissions"}
            
            # Check user match
            if user_id and payload.get("user_id") != user_id:
                return {"valid": False, "error": "User mismatch"}
            
            return {
                "valid": True,
                "user_id": payload.get("user_id"),
                "action": token_action,
                "payload": payload,
            }
            
        except JWTError as e:
            return {"valid": False, "error": str(e)}
        except ImportError:
            # Fallback if JWT not available
            return {"valid": True, "user_id": user_id, "action": action}
    
    def generate_token(
        self,
        user_id: str,
        action: str = "read",
        expires_in: int = 3600,
        metadata: Dict[str, Any] = None,
        **kwargs,
    ) -> Dict[str, Any]:
        """
        Generate token for user and action.
        """
        try:
            # Example: Generate JWT token
            from jose import jwt
            import time
            
            payload = {
                "user_id": user_id,
                "action": action,
                "exp": int(time.time()) + expires_in,
                "iat": int(time.time()),
                "metadata": metadata or {},
            }
            
            token = jwt.encode(
                payload,
                "your-secret-key",  # Should be from settings
                algorithm="HS256",
            )
            
            return {
                "success": True,
                "token": token,
                "expires_in": expires_in,
                "payload": payload,
            }
            
        except Exception as e:
            return {"success": False, "error": str(e)}
    
    def revoke_token(self, token: str, **kwargs) -> Dict[str, Any]:
        """Revoke token."""
        # Implement token revocation logic
        # This might involve blacklisting the token
        
        return {"success": True, "message": "Token revoked"}


class TokenProtectedService(TokenService):
    """
    Service that requires token protection.
    """
    
    def execute(self, operation: str, **kwargs) -> Any:
        """Execute operation with token validation."""
        token = kwargs.pop("token", None)
        user_id = kwargs.pop("user_id", None)
        action = kwargs.pop("action", operation)
        
        # Validate token
        if token:
            validation = self.validate_token(token, action, user_id)
            if not validation.get("valid"):
                raise PermissionError(validation.get("error", "Token validation failed"))
        
        return super().execute(operation, **kwargs)
    
    def get_with_token(
        self,
        identifier: Any,
        token: str,
        action: str = "read",
        user_id: Optional[str] = None,
        **kwargs,
    ) -> Optional[models.Model]:
        """
        Get object with token validation.
        """
        # Validate token
        validation = self.validate_token(token, action, user_id)
        if not validation.get("valid"):
            return None
        
        return self.get(identifier, **kwargs)
    
    def create_with_token(
        self,
        data: Dict[str, Any],
        token: str,
        user_id: Optional[str] = None,
        **kwargs,
    ) -> Tuple[bool, Optional[models.Model], str]:
        """
        Create with token validation.
        """
        # Validate token
        validation = self.validate_token(token, "create", user_id)
        if not validation.get("valid"):
            return False, None, validation.get("error", "Token validation failed")
        
        try:
            obj = self.create(data, **kwargs)
            return True, obj, "Created successfully"
        except Exception as e:
            return False, None, str(e)
    
    def update_with_token(
        self,
        identifier: Any,
        data: Dict[str, Any],
        token: str,
        user_id: Optional[str] = None,
        **kwargs,
    ) -> Tuple[bool, Optional[models.Model], str]:
        """
        Update with token validation.
        """
        # Validate token
        validation = self.validate_token(token, "update", user_id)
        if not validation.get("valid"):
            return False, None, validation.get("error", "Token validation failed")
        
        result = self.update(identifier, data, **kwargs)
        if result:
            return True, result, "Updated successfully"
        return False, None, "Update failed"
    
    def delete_with_token(
        self,
        identifier: Any,
        token: str,
        user_id: Optional[str] = None,
        **kwargs,
    ) -> Tuple[bool, str]:
        """
        Delete with token validation.
        """
        # Validate token
        validation = self.validate_token(token, "delete", user_id)
        if not validation.get("valid"):
            return False, validation.get("error", "Token validation failed")
        
        success = self.delete(identifier, **kwargs)
        if success:
            return True, "Deleted successfully"
        return False, "Delete failed"