#!/usr/bin/env python3
"""
Cleanup daemon for expired files and pastes in Sharey
Runs continuously and checks for expired files at regular intervals
Supports both local storage and Backblaze B2 storage backends
"""
import os
import sys
import json
import sqlite3
import time
import signal
from datetime import datetime, timezone
from pathlib import Path

# Add the project root to Python path
project_root = Path(__file__).parent
sys.path.append(str(project_root))

from src.config import config
from src.storage import StorageManager
from expiry_db import ExpiryDatabase

# Configuration
CLEANUP_INTERVAL = 60  # seconds (1 minute)
CHECK_INTERVAL = 5     # seconds between startup checks

# Global flag for graceful shutdown
running = True

def signal_handler(signum, frame):
    """Handle shutdown signals gracefully"""
    global running
    print(f"\n🛑 Received signal {signum}, shutting down gracefully...")
    running = False

def cleanup_expired_files():
    """Perform cleanup of expired files (same logic as cleanup script)"""
    try:
        # Initialize storage manager
        storage_manager = StorageManager(config)
        backend_info = storage_manager.get_backend_info()
        
        # Initialize expiry database
        expiry_db = ExpiryDatabase()
        
        # Get expired files from database
        expired_files = expiry_db.get_expired_files()
        
        if not expired_files:
            print(f"⏰ {datetime.now().strftime('%H:%M:%S')} - No expired files found")
            return 0
        
        print(f"🗑️ {datetime.now().strftime('%H:%M:%S')} - Found {len(expired_files)} expired files to delete")
        
        deleted_count = 0
        for file_info in expired_files:
            file_path = file_info['file_path']
            expires_at = file_info['expires_at']
            
            try:
                print(f"🗑️ Deleting: {file_path} (expired: {expires_at})")
                
                # Delete from storage backend
                if storage_manager.delete_file(file_path):
                    # Remove from expiry database
                    expiry_db.remove_file(file_path)
                    deleted_count += 1
                    print(f"✅ Deleted: {file_path}")
                else:
                    print(f"❌ Failed to delete: {file_path}")
                    
            except Exception as e:
                print(f"❌ Error deleting {file_path}: {e}")
        
        if deleted_count > 0:
            print(f"✅ Cleanup completed! Deleted {deleted_count} expired files")
            
        return deleted_count
        
    except Exception as e:
        print(f"❌ Cleanup error: {e}")
        return -1

def main():
    """Main daemon function"""
    # Set up signal handlers for graceful shutdown
    signal.signal(signal.SIGINT, signal_handler)   # Ctrl+C
    signal.signal(signal.SIGTERM, signal_handler)  # systemctl stop
    
    print("🧹 Sharey Cleanup Daemon")
    print("=" * 40)
    print(f"🚀 Started at: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}")
    print(f"⏰ Cleanup interval: {CLEANUP_INTERVAL} seconds")
    print(f"📁 Storage backend: {config.get('storage', {}).get('backend', 'b2')}")
    print(f"🗄️ Database: expiry.db")
    print("=" * 40)
    print("Press Ctrl+C to stop")
    print()
    
    last_cleanup = 0
    
    try:
        while running:
            current_time = time.time()
            
            # Check if it's time for cleanup
            if current_time - last_cleanup >= CLEANUP_INTERVAL:
                try:
                    cleanup_expired_files()
                    last_cleanup = current_time
                except Exception as e:
                    print(f"❌ Cleanup cycle failed: {e}")
            
            # Sleep for a short interval to avoid busy waiting
            time.sleep(CHECK_INTERVAL)
            
    except KeyboardInterrupt:
        pass  # Handle Ctrl+C gracefully
    
    print(f"\n🛑 Cleanup daemon stopped at: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}")
    print("👋 Goodbye!")

if __name__ == "__main__":
    try:
        main()
    except Exception as e:
        print(f"❌ Daemon failed to start: {e}")
        sys.exit(1)
    
    sys.exit(0)