"""
Cleanup script for expired refresh tokens
Run this periodically (e.g., daily cron job) to remove expired tokens
"""

import asyncio
import sys
import os
from datetime import datetime

# Add parent directory to path
sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))

from app.models.refresh_token_model import RefreshTokenModel
import logging

logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
)
logger = logging.getLogger(__name__)

async def cleanup_expired_tokens():
    """Remove expired refresh tokens from database"""
    logger.info("Starting cleanup of expired refresh tokens...")
    
    try:
        deleted_count = await RefreshTokenModel.cleanup_expired_tokens()
        logger.info(f"✅ Successfully cleaned up {deleted_count} expired tokens")
        return deleted_count
        
    except Exception as e:
        logger.error(f"❌ Error during cleanup: {str(e)}", exc_info=True)
        raise

async def get_token_statistics():
    """Get statistics about refresh tokens"""
    from app.core.nosql_client import db
    
    try:
        collection = db["refresh_tokens"]
        
        # Total tokens
        total = await collection.count_documents({})
        
        # Active tokens (not revoked, not expired)
        active = await collection.count_documents({
            "revoked": False,
            "expires_at": {"$gt": datetime.utcnow()}
        })
        
        # Revoked tokens
        revoked = await collection.count_documents({"revoked": True})
        
        # Expired tokens
        expired = await collection.count_documents({
            "expires_at": {"$lt": datetime.utcnow()}
        })
        
        # Used tokens
        used = await collection.count_documents({"used": True})
        
        # Remember me tokens
        remember_me = await collection.count_documents({"remember_me": True})
        
        logger.info("\n📊 Token Statistics:")
        logger.info(f"  Total tokens: {total}")
        logger.info(f"  Active tokens: {active}")
        logger.info(f"  Revoked tokens: {revoked}")
        logger.info(f"  Expired tokens: {expired}")
        logger.info(f"  Used tokens: {used}")
        logger.info(f"  Remember me tokens: {remember_me}")
        
        return {
            "total": total,
            "active": active,
            "revoked": revoked,
            "expired": expired,
            "used": used,
            "remember_me": remember_me
        }
        
    except Exception as e:
        logger.error(f"❌ Error getting statistics: {str(e)}", exc_info=True)
        raise

async def check_suspicious_activity():
    """Check for suspicious token rotation patterns"""
    from app.core.cache_client import get_redis
    import json
    
    try:
        redis = await get_redis()
        
        # Get all token families
        cursor = 0
        suspicious_families = []
        
        while True:
            cursor, keys = await redis.scan(cursor, match="token_family:*", count=100)
            
            for key in keys:
                data = await redis.get(key)
                if data:
                    family_data = json.loads(data)
                    rotation_count = family_data.get("rotation_count", 0)
                    
                    # Flag families with excessive rotations (>100 in 30 days)
                    if rotation_count > 100:
                        suspicious_families.append({
                            "family_id": key.split(":")[-1],
                            "customer_id": family_data.get("customer_id"),
                            "rotation_count": rotation_count,
                            "created_at": family_data.get("created_at")
                        })
            
            if cursor == 0:
                break
        
        if suspicious_families:
            logger.warning(f"\n⚠️  Found {len(suspicious_families)} suspicious token families:")
            for family in suspicious_families:
                logger.warning(f"  - Family {family['family_id']}: {family['rotation_count']} rotations")
                logger.warning(f"    Customer: {family['customer_id']}")
        else:
            logger.info("\n✅ No suspicious token activity detected")
        
        return suspicious_families
        
    except Exception as e:
        logger.error(f"❌ Error checking suspicious activity: {str(e)}", exc_info=True)
        return []

async def main():
    """Main cleanup function"""
    logger.info("=" * 60)
    logger.info("Refresh Token Cleanup Script")
    logger.info(f"Run time: {datetime.utcnow().isoformat()}")
    logger.info("=" * 60)
    
    # Get statistics before cleanup
    logger.info("\n📈 Statistics before cleanup:")
    await get_token_statistics()
    
    # Perform cleanup
    logger.info("\n🧹 Performing cleanup...")
    deleted_count = await cleanup_expired_tokens()
    
    # Get statistics after cleanup
    logger.info("\n📈 Statistics after cleanup:")
    await get_token_statistics()
    
    # Check for suspicious activity
    logger.info("\n🔍 Checking for suspicious activity...")
    suspicious = await check_suspicious_activity()
    
    # Summary
    logger.info("\n" + "=" * 60)
    logger.info("Cleanup Summary:")
    logger.info(f"  Deleted tokens: {deleted_count}")
    logger.info(f"  Suspicious families: {len(suspicious)}")
    logger.info("=" * 60)

if __name__ == "__main__":
    asyncio.run(main())