#!/usr/bin/env python3
"""
Resolution Update Utility for Karaoke Playlist Downloader
Easily update the preferred video resolution in the configuration.
"""

import json
import argparse
from pathlib import Path


def update_resolution(resolution):
    """Update the resolution in config.json file."""
    config_file = Path("config.json")
    
    # Load existing config or create default
    if config_file.exists():
        try:
            with open(config_file, 'r', encoding='utf-8') as f:
                config = json.load(f)
        except json.JSONDecodeError:
            print("❌ Error: Invalid config.json file")
            return False
    else:
        print("📝 Creating new config.json file...")
        config = {
            "download_settings": {
                "format": "best[height<=720][ext=mp4]/best[height<=720]/best[ext=mp4]/best",
                "preferred_resolution": "720p",
                "audio_format": "mp3",
                "audio_quality": "0",
                "subtitle_language": "en",
                "subtitle_format": "srt",
                "write_metadata": True,
                "write_thumbnail": True,
                "write_description": True,
                "write_annotations": True,
                "write_comments": True,
                "write_subtitles": True,
                "embed_metadata": True,
                "add_metadata": True,
                "continue_downloads": True,
                "no_overwrites": True,
                "ignore_errors": True,
                "no_warnings": False
            },
            "folder_structure": {
                "downloads_dir": "downloads",
                "logs_dir": "logs",
                "tracking_file": "karaoke_tracking.json"
            },
            "logging": {
                "level": "INFO",
                "format": "%(asctime)s - %(levelname)s - %(message)s",
                "include_console": True,
                "include_file": True
            },
            "yt_dlp_path": "downloader/yt-dlp.exe"
        }
    
    # Resolution mapping
    resolution_map = {
        '480p': '480',
        '720p': '720',
        '1080p': '1080',
        '1440p': '1440',
        '2160p': '2160'
    }
    
    if resolution not in resolution_map:
        print(f"❌ Error: Invalid resolution '{resolution}'")
        print(f"Valid options: {', '.join(resolution_map.keys())}")
        return False
    
    height = resolution_map[resolution]
    old_resolution = config["download_settings"].get("preferred_resolution", "720p")
    
    # Update the format string
    config["download_settings"]["format"] = f"best[height<={height}][ext=mp4]/best[height<={height}]/best[ext=mp4]/best"
    config["download_settings"]["preferred_resolution"] = resolution
    
    # Save the updated config
    try:
        with open(config_file, 'w', encoding='utf-8') as f:
            json.dump(config, f, indent=2, ensure_ascii=False)
        
        print(f"✅ Successfully updated resolution from {old_resolution} to {resolution}")
        print(f"📝 Format string: {config['download_settings']['format']}")
        return True
        
    except Exception as e:
        print(f"❌ Error saving config: {e}")
        return False


def show_current_resolution():
    """Show the current resolution setting."""
    config_file = Path("config.json")
    
    if not config_file.exists():
        print("📝 No config.json file found. Using default 720p resolution.")
        return
    
    try:
        with open(config_file, 'r', encoding='utf-8') as f:
            config = json.load(f)
        
        current_resolution = config["download_settings"].get("preferred_resolution", "720p")
        current_format = config["download_settings"].get("format", "best[height<=720][ext=mp4]/best[height<=720]/best[ext=mp4]/best")
        
        print(f"🎬 Current resolution: {current_resolution}")
        print(f"📝 Format string: {current_format}")
        
    except json.JSONDecodeError:
        print("❌ Error: Invalid config.json file")
    except Exception as e:
        print(f"❌ Error reading config: {e}")


def main():
    parser = argparse.ArgumentParser(
        description="Update video resolution for Karaoke Playlist Downloader",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="""
Examples:
  python update_resolution.py --show
  python update_resolution.py --resolution 1080p
  python update_resolution.py --resolution 720p
        """
    )
    
    parser.add_argument(
        '--resolution', '-r',
        choices=['480p', '720p', '1080p', '1440p', '2160p'],
        help='Set the preferred video resolution'
    )
    
    parser.add_argument(
        '--show', '-s',
        action='store_true',
        help='Show current resolution setting'
    )
    
    args = parser.parse_args()
    
    if args.show:
        show_current_resolution()
    elif args.resolution:
        update_resolution(args.resolution)
    else:
        parser.print_help()


if __name__ == "__main__":
    main()