import sys
import argparse
from pathlib import Path
from karaoke_downloader.downloader import KaraokeDownloader
import os

# Constants
DEFAULT_FUZZY_THRESHOLD = 85
DEFAULT_LATEST_PER_CHANNEL_LIMIT = 5
DEFAULT_DISPLAY_LIMIT = 10
DEFAULT_CACHE_DURATION_HOURS = 24

def main():
    parser = argparse.ArgumentParser(
        description="Karaoke Video Downloader - Download YouTube playlists and channel videos for karaoke",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="""
Examples:
  python download_karaoke.py https://www.youtube.com/playlist?list=XYZ
  python download_karaoke.py https://www.youtube.com/@SingKingKaraoke/videos
  python download_karaoke.py --file data/channels.txt
  python download_karaoke.py --reset-channel SingKingKaraoke --delete-files
        """
    )
    parser.add_argument('url', nargs='?', help='YouTube playlist or channel URL to download')
    parser.add_argument('--file', '-f', help='Text file containing playlist or channel URLs (one per line)')
    parser.add_argument('--status', '-s', action='store_true', help='Show download status and statistics')
    parser.add_argument('--report', '-r', metavar='PLAYLIST_ID', help='Generate a detailed report for a specific playlist')
    parser.add_argument('--sync', '--sync-only', action='store_true', help='Only sync playlist without downloading (update tracking)')
    parser.add_argument('--cleanup', action='store_true', help='Clean up orphaned tracking entries')
    parser.add_argument('--resolution', '--res', choices=['480p', '720p', '1080p', '1440p', '2160p'], default='720p', help='Preferred video resolution (default: 720p)')
    parser.add_argument('--limit', '-l', type=int, help='Limit the number of videos to download (e.g., --limit 10)')
    parser.add_argument('--refresh', '--force-refresh', action='store_true', help='Force refresh channel cache (ignore cached data)')
    parser.add_argument('--cache-info', action='store_true', help='Show channel cache information')
    parser.add_argument('--clear-cache', metavar='CHANNEL_ID', nargs='?', const='all', help='Clear cache for specific channel or all channels (use --clear-cache all)')
    parser.add_argument('--cache-duration', type=int, metavar='HOURS', help='Set cache duration in hours (default: 24)')
    parser.add_argument('--songlist-priority', action='store_true', help='Prioritize downloads based on data/songList.json (default: enabled)')
    parser.add_argument('--no-songlist-priority', action='store_true', help='Disable songlist prioritization')
    parser.add_argument('--songlist-only', action='store_true', help='Only download songs that are in the songlist (skip all others)')
    parser.add_argument('--songlist-status', action='store_true', help='Show songlist download status and statistics')
    parser.add_argument('--reset-channel', metavar='CHANNEL_NAME', help='Reset all tracking and files for a channel')
    parser.add_argument('--reset-songlist', action='store_true', help='When used with --reset-channel, also reset songlist songs for this channel')
    parser.add_argument('--reset-songlist-all', action='store_true', help='Reset all songlist tracking and delete all songlist-downloaded files (global)')
    parser.add_argument('--clear-server-duplicates', action='store_true', help='Clear server duplicates tracking (allows re-checking songs against server)')
    parser.add_argument('--version', '-v', action='version', version='Karaoke Playlist Downloader v1.0')
    parser.add_argument('--force-download-plan', action='store_true', help='Force refresh the download plan cache (re-scan all channels for matches)')
    parser.add_argument('--latest-per-channel', action='store_true', help='Download the latest N videos from each channel (use with --limit)')
    parser.add_argument('--fuzzy-match', action='store_true', help='Enable fuzzy matching for songlist-to-video matching (uses rapidfuzz if available)')
    parser.add_argument('--fuzzy-threshold', type=int, default=90, help='Fuzzy match threshold (0-100, default 90)')
    args = parser.parse_args()

    yt_dlp_path = Path("downloader/yt-dlp.exe")
    if not yt_dlp_path.exists():
        print("❌ Error: yt-dlp.exe not found in downloader/ directory")
        print("Please ensure yt-dlp.exe is present in the downloader/ folder")
        sys.exit(1)

    downloader = KaraokeDownloader()
    if args.limit:
        downloader.download_limit = args.limit
        print(f"🎯 Download limit set to: {args.limit} videos")
    if args.no_songlist_priority:
        downloader.use_songlist_priority = False
        print("🎯 Songlist prioritization disabled")
    else:
        downloader.use_songlist_priority = True
        print("🎯 Songlist prioritization enabled")
    if args.songlist_only:
        downloader.songlist_only = True
        print("🎯 Songlist-only mode enabled (will only download songlist songs)")
    if args.resolution != '720p':
        resolution_map = {
            '480p': '480',
            '720p': '720',
            '1080p': '1080',
            '1440p': '1440',
            '2160p': '2160'
        }
        height = resolution_map[args.resolution]
        downloader.config["download_settings"]["format"] = f"best[height<={height}][ext=mp4]/best[height<={height}]/best[ext=mp4]/best"
        downloader.config["download_settings"]["preferred_resolution"] = args.resolution
        print(f"🎬 Using resolution: {args.resolution}")

    # --- NEW: Reset channel CLI command ---
    if args.reset_channel:
        downloader.reset_channel_downloads(
            args.reset_channel,
            reset_songlist=args.reset_songlist,
            delete_files=True  # Always delete files if they exist
        )
        sys.exit(0)
    # --- END NEW ---

    # --- NEW: If no URL or file is provided, but --songlist-only is set, use all channels in data/channels.txt ---
    if args.songlist_only and not args.url and not args.file:
        channels_file = Path("data/channels.txt")
        if channels_file.exists():
            args.file = str(channels_file)
            print("📋 No URL or --file provided, defaulting to all channels in data/channels.txt for songlist-only mode.")
        else:
            print("❌ No URL, --file, or data/channels.txt found. Please provide a channel URL or a file with channel URLs.")
            sys.exit(1)
    # --- END NEW ---

    if args.reset_songlist_all:
        from karaoke_downloader.downloader import reset_songlist_all
        reset_songlist_all()
        print('✅ All songlist tracking and files have been reset.')
        sys.exit(0)

    if args.clear_server_duplicates:
        from karaoke_downloader.server_manager import save_server_duplicates_tracking
        save_server_duplicates_tracking({})
        print('✅ Server duplicates tracking has been cleared.')
        print('ℹ️  Songs will be re-checked against the server on next run.')
        sys.exit(0)

    if args.status:
        stats = downloader.tracker.get_statistics()
        print("🎤 Karaoke Downloader Status")
        print("=" * 40)
        print(f"Total Songs: {stats['total_songs']}")
        print(f"Total Playlists: {stats['total_playlists']}")
        print(f"Downloaded Songs: {stats['downloaded_songs']}")
        print(f"Failed Songs: {stats['failed_songs']}")
        print(f"Partial Downloads: {stats['partial_songs']}")
        print(f"Total Size: {stats['total_size_mb']} MB")
        print(f"Last Updated: {stats['last_updated']}")
        sys.exit(0)
    elif args.cache_info:
        cache_info = downloader.tracker.get_cache_info()
        print("💾 Channel Cache Information")
        print("=" * 40)
        print(f"Total Channels: {cache_info['total_channels']}")
        print(f"Total Cached Videos: {cache_info['total_cached_videos']}")
        print(f"Cache Duration: {cache_info['cache_duration_hours']} hours")
        print(f"Last Updated: {cache_info['last_updated']}")
        sys.exit(0)
    elif args.clear_cache:
        if args.clear_cache == 'all':
            downloader.tracker.clear_channel_cache()
            print("🧹 Cleared all channel caches")
        else:
            downloader.tracker.clear_channel_cache(args.clear_cache)
            print(f"🧹 Cleared cache for channel: {args.clear_cache}")
        sys.exit(0)
    elif args.cache_duration:
        downloader.tracker.set_cache_duration(args.cache_duration)
        print(f"⏰ Cache duration set to {args.cache_duration} hours")
        sys.exit(0)
    elif args.report:
        report = downloader.tracker.export_playlist_report(args.report)
        print(report)
        sys.exit(0)
    elif args.cleanup:
        orphaned = downloader.tracker.cleanup_orphaned_files(downloader.downloads_dir)
        print(f"🧹 Cleaned up {len(orphaned)} orphaned tracking entries")
        sys.exit(0)
    elif args.songlist_status:
        songlist = downloader._load_songlist()
        tracking = downloader.songlist_tracking
        print("📋 Songlist Download Status")
        print("=" * 40)
        print(f"Total songs in list: {len(songlist)}")
        print(f"Songs downloaded: {len(tracking)}")
        print(f"Songs remaining: {len(songlist) - len(tracking)}")
        print(f"Progress: {(len(tracking) / len(songlist) * 100):.1f}%")
        if tracking:
            print(f"\n📁 Downloaded songs:")
            for key, info in list(tracking.items())[:10]:
                print(f"   • {info['artist']} - {info['title']} (from {info['channel']})")
            if len(tracking) > 10:
                print(f"   ... and {len(tracking) - 10} more")
        sys.exit(0)
    elif args.songlist_only:
        # Use provided file or default to data/channels.txt
        channel_file = args.file if args.file else "data/channels.txt"
        if not os.path.exists(channel_file):
            print(f"❌ Channel file not found: {channel_file}")
            sys.exit(1)
        with open(channel_file, "r", encoding="utf-8") as f:
            channel_urls = [line.strip() for line in f if line.strip() and not line.strip().startswith("#")]
        limit = args.limit if args.limit else None
        force_refresh_download_plan = args.force_download_plan if hasattr(args, 'force_download_plan') else False
        fuzzy_match = args.fuzzy_match if hasattr(args, 'fuzzy_match') else False
        fuzzy_threshold = args.fuzzy_threshold if hasattr(args, 'fuzzy_threshold') else DEFAULT_FUZZY_THRESHOLD
        success = downloader.download_songlist_across_channels(channel_urls, limit=limit, force_refresh_download_plan=force_refresh_download_plan, fuzzy_match=fuzzy_match, fuzzy_threshold=fuzzy_threshold)
    elif args.latest_per_channel:
        # Use provided file or default to data/channels.txt
        channel_file = args.file if args.file else "data/channels.txt"
        if not os.path.exists(channel_file):
            print(f"❌ Channel file not found: {channel_file}")
            sys.exit(1)
        with open(channel_file, "r", encoding="utf-8") as f:
            channel_urls = [line.strip() for line in f if line.strip() and not line.strip().startswith("#")]
        limit = args.limit if args.limit else DEFAULT_LATEST_PER_CHANNEL_LIMIT
        force_refresh_download_plan = args.force_download_plan if hasattr(args, 'force_download_plan') else False
        fuzzy_match = args.fuzzy_match if hasattr(args, 'fuzzy_match') else False
        fuzzy_threshold = args.fuzzy_threshold if hasattr(args, 'fuzzy_threshold') else DEFAULT_FUZZY_THRESHOLD
        success = downloader.download_latest_per_channel(channel_urls, limit=limit, force_refresh_download_plan=force_refresh_download_plan, fuzzy_match=fuzzy_match, fuzzy_threshold=fuzzy_threshold)
    elif args.url:
        success = downloader.download_channel_videos(args.url, force_refresh=args.refresh)
    else:
        parser.print_help()
        sys.exit(1)
    downloader.tracker.force_save()
    if success:
        print("\n🎤 All downloads completed successfully!")
        sys.exit(0)
    else:
        print("\n⚠️ Some downloads may have failed. Check the logs for details.")
        sys.exit(1)