from datetime import datetime, timedelta
from typing import Optional
import uuid
import logging
from app.core.nosql_client import db
from app.core.cache_client import get_redis

logger = logging.getLogger("refresh_token_model")

class RefreshTokenModel:
    """Model for managing refresh tokens with rotation support"""
    
    collection = db["refresh_tokens"]
    
    # Token family tracking for rotation
    TOKEN_FAMILY_TTL = 30 * 24 * 3600  # 30 days in seconds
    
    @staticmethod
    async def create_token_family(customer_id: str, device_info: Optional[str] = None) -> str:
        """Create a new token family for refresh token rotation"""
        family_id = str(uuid.uuid4())
        
        try:
            redis = await get_redis()
            family_key = f"token_family:{family_id}"
            
            family_data = {
                "customer_id": customer_id,
                "device_info": device_info,
                "created_at": datetime.utcnow().isoformat(),
                "rotation_count": 0
            }
            
            import json
            await redis.setex(family_key, RefreshTokenModel.TOKEN_FAMILY_TTL, json.dumps(family_data))
            
            logger.info(f"Created token family {family_id} for user {customer_id}")
            return family_id
            
        except Exception as e:
            logger.error(f"Error creating token family: {str(e)}", exc_info=True)
            raise
    
    @staticmethod
    async def get_token_family(family_id: str) -> Optional[dict]:
        """Get token family data"""
        try:
            redis = await get_redis()
            family_key = f"token_family:{family_id}"
            
            data = await redis.get(family_key)
            if data:
                import json
                return json.loads(data)
            return None
            
        except Exception as e:
            logger.error(f"Error getting token family: {str(e)}", exc_info=True)
            return None
    
    @staticmethod
    async def increment_rotation_count(family_id: str) -> int:
        """Increment rotation count for a token family"""
        try:
            redis = await get_redis()
            family_key = f"token_family:{family_id}"
            
            family_data = await RefreshTokenModel.get_token_family(family_id)
            if not family_data:
                return 0
            
            family_data["rotation_count"] = family_data.get("rotation_count", 0) + 1
            family_data["last_rotated"] = datetime.utcnow().isoformat()
            
            import json
            ttl = await redis.ttl(family_key)
            if ttl > 0:
                await redis.setex(family_key, ttl, json.dumps(family_data))
            
            logger.info(f"Incremented rotation count for family {family_id} to {family_data['rotation_count']}")
            return family_data["rotation_count"]
            
        except Exception as e:
            logger.error(f"Error incrementing rotation count: {str(e)}", exc_info=True)
            return 0
    
    @staticmethod
    async def store_refresh_token(
        token_id: str,
        customer_id: str,
        family_id: str,
        expires_at: datetime,
        remember_me: bool = False,
        device_info: Optional[str] = None,
        ip_address: Optional[str] = None
    ):
        """Store refresh token metadata"""
        try:
            token_doc = {
                "token_id": token_id,
                "customer_id": customer_id,
                "family_id": family_id,
                "expires_at": expires_at,
                "remember_me": remember_me,
                "device_info": device_info,
                "ip_address": ip_address,
                "created_at": datetime.utcnow(),
                "revoked": False,
                "used": False
            }
            
            await RefreshTokenModel.collection.insert_one(token_doc)
            logger.info(f"Stored refresh token {token_id} for user {customer_id}")
            
        except Exception as e:
            logger.error(f"Error storing refresh token: {str(e)}", exc_info=True)
            raise
    
    @staticmethod
    async def mark_token_as_used(token_id: str) -> bool:
        """Mark a refresh token as used (for rotation)"""
        try:
            result = await RefreshTokenModel.collection.update_one(
                {"token_id": token_id},
                {
                    "$set": {
                        "used": True,
                        "used_at": datetime.utcnow()
                    }
                }
            )
            
            if result.modified_count > 0:
                logger.info(f"Marked token {token_id} as used")
                return True
            return False
            
        except Exception as e:
            logger.error(f"Error marking token as used: {str(e)}", exc_info=True)
            return False
    
    @staticmethod
    async def is_token_valid(token_id: str) -> bool:
        """Check if a refresh token is valid (not revoked or used)"""
        try:
            token = await RefreshTokenModel.collection.find_one({"token_id": token_id})
            
            if not token:
                logger.warning(f"Token {token_id} not found")
                return False
            
            if token.get("revoked"):
                logger.warning(f"Token {token_id} is revoked")
                return False
            
            if token.get("used"):
                logger.warning(f"Token {token_id} already used - possible replay attack")
                # Revoke entire token family on reuse attempt
                await RefreshTokenModel.revoke_token_family(token.get("family_id"))
                return False
            
            if token.get("expires_at") < datetime.utcnow():
                logger.warning(f"Token {token_id} is expired")
                return False
            
            return True
            
        except Exception as e:
            logger.error(f"Error checking token validity: {str(e)}", exc_info=True)
            return False
    
    @staticmethod
    async def get_token_metadata(token_id: str) -> Optional[dict]:
        """Get refresh token metadata"""
        try:
            token = await RefreshTokenModel.collection.find_one({"token_id": token_id})
            return token
        except Exception as e:
            logger.error(f"Error getting token metadata: {str(e)}", exc_info=True)
            return None
    
    @staticmethod
    async def revoke_token(token_id: str) -> bool:
        """Revoke a specific refresh token"""
        try:
            result = await RefreshTokenModel.collection.update_one(
                {"token_id": token_id},
                {
                    "$set": {
                        "revoked": True,
                        "revoked_at": datetime.utcnow()
                    }
                }
            )
            
            if result.modified_count > 0:
                logger.info(f"Revoked token {token_id}")
                return True
            return False
            
        except Exception as e:
            logger.error(f"Error revoking token: {str(e)}", exc_info=True)
            return False
    
    @staticmethod
    async def revoke_token_family(family_id: str) -> int:
        """Revoke all tokens in a family (security breach detection)"""
        try:
            result = await RefreshTokenModel.collection.update_many(
                {"family_id": family_id, "revoked": False},
                {
                    "$set": {
                        "revoked": True,
                        "revoked_at": datetime.utcnow(),
                        "revoke_reason": "token_reuse_detected"
                    }
                }
            )
            
            # Also delete the family from Redis
            redis = await get_redis()
            await redis.delete(f"token_family:{family_id}")
            
            logger.warning(f"Revoked {result.modified_count} tokens in family {family_id}")
            return result.modified_count
            
        except Exception as e:
            logger.error(f"Error revoking token family: {str(e)}", exc_info=True)
            return 0
    
    @staticmethod
    async def revoke_all_user_tokens(customer_id: str) -> int:
        """Revoke all refresh tokens for a user (logout from all devices)"""
        try:
            result = await RefreshTokenModel.collection.update_many(
                {"customer_id": customer_id, "revoked": False},
                {
                    "$set": {
                        "revoked": True,
                        "revoked_at": datetime.utcnow(),
                        "revoke_reason": "user_logout_all"
                    }
                }
            )
            
            logger.info(f"Revoked {result.modified_count} tokens for user {customer_id}")
            return result.modified_count
            
        except Exception as e:
            logger.error(f"Error revoking all user tokens: {str(e)}", exc_info=True)
            return 0
    
    @staticmethod
    async def get_active_sessions(customer_id: str) -> list:
        """Get all active sessions (valid refresh tokens) for a user"""
        try:
            tokens = await RefreshTokenModel.collection.find({
                "customer_id": customer_id,
                "revoked": False,
                "expires_at": {"$gt": datetime.utcnow()}
            }).to_list(length=100)
            
            return tokens
            
        except Exception as e:
            logger.error(f"Error getting active sessions: {str(e)}", exc_info=True)
            return []
    
    @staticmethod
    async def cleanup_expired_tokens():
        """Cleanup expired tokens (run periodically)"""
        try:
            result = await RefreshTokenModel.collection.delete_many({
                "expires_at": {"$lt": datetime.utcnow()}
            })
            
            logger.info(f"Cleaned up {result.deleted_count} expired tokens")
            return result.deleted_count
            
        except Exception as e:
            logger.error(f"Error cleaning up expired tokens: {str(e)}", exc_info=True)
            return 0