#!/usr/bin/env python3
"""
DReader E-Book Reader - Main Entry Point

This script launches the DReader application with a Pygame-based
desktop HAL for testing and development.

Usage:
    python run_dreader.py [library_path]
    python run_dreader.py ~/Books
    python run_dreader.py tests/data/library-epub

Options:
    --width WIDTH       Window width (default: 800)
    --height HEIGHT     Window height (default: 1200)
    --fullscreen        Run in fullscreen mode
    --log-level LEVEL   Logging level: DEBUG, INFO, WARNING, ERROR (default: INFO)

Examples:
    # Run with default library path
    python run_dreader.py

    # Run with custom library
    python run_dreader.py ~/Documents/Books

    # Run in fullscreen
    python run_dreader.py --fullscreen

    # Run with debug logging
    python run_dreader.py --log-level DEBUG
"""

import sys
import asyncio
import argparse
import logging
from pathlib import Path

# Add parent directory to path
sys.path.insert(0, str(Path(__file__).parent))

from dreader.main import DReaderApplication, AppConfig
from dreader.hal_pygame import PygameDisplayHAL


def parse_args():
    """Parse command line arguments."""
    parser = argparse.ArgumentParser(
        description="DReader E-Book Reader Application",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="""
Examples:
  %(prog)s                           # Use default library path
  %(prog)s ~/Books                   # Custom library path
  %(prog)s --width 1200 --height 1600  # Custom window size
  %(prog)s --fullscreen              # Fullscreen mode
  %(prog)s --log-level DEBUG         # Debug logging
        """
    )

    parser.add_argument(
        'library_path',
        nargs='?',
        default=None,
        help='Path to directory containing EPUB files (default: tests/data/library-epub)'
    )

    parser.add_argument(
        '--width',
        type=int,
        default=800,
        help='Window width in pixels (default: 800)'
    )

    parser.add_argument(
        '--height',
        type=int,
        default=1200,
        help='Window height in pixels (default: 1200)'
    )

    parser.add_argument(
        '--fullscreen',
        action='store_true',
        help='Run in fullscreen mode'
    )

    parser.add_argument(
        '--library',
        action='store_true',
        help='Always start in library mode (ignore saved state)'
    )

    parser.add_argument(
        '--log-level',
        choices=['DEBUG', 'INFO', 'WARNING', 'ERROR'],
        default='INFO',
        help='Logging level (default: INFO)'
    )

    return parser.parse_args()


def main():
    """Main entry point."""
    args = parse_args()

    # Set up logging
    log_level = getattr(logging, args.log_level)
    logging.basicConfig(
        level=log_level,
        format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
    )

    logger = logging.getLogger(__name__)
    logger.info("Starting DReader E-Book Reader")

    # Determine library path
    if args.library_path:
        library_path = Path(args.library_path).expanduser().resolve()
    else:
        # Default to test library
        library_path = Path(__file__).parent / "tests" / "data" / "library-epub"

    # Verify library path exists
    if not library_path.exists():
        logger.error(f"Library path does not exist: {library_path}")
        print(f"\nError: Library directory not found: {library_path}")
        print("\nPlease provide a valid path to a directory containing EPUB files.")
        print("Example:")
        print(f"  python {sys.argv[0]} ~/Documents/Books")
        sys.exit(1)

    if not library_path.is_dir():
        logger.error(f"Library path is not a directory: {library_path}")
        print(f"\nError: Not a directory: {library_path}")
        sys.exit(1)

    logger.info(f"Library path: {library_path}")
    logger.info(f"Window size: {args.width}x{args.height}")
    logger.info(f"Fullscreen: {args.fullscreen}")
    logger.info(f"Force library mode: {args.library}")

    # Create HAL
    try:
        hal = PygameDisplayHAL(
            width=args.width,
            height=args.height,
            fullscreen=args.fullscreen
        )
    except RuntimeError as e:
        logger.error(f"Failed to initialize Pygame HAL: {e}")
        print(f"\nError: {e}")
        print("\nTo install Pygame, run:")
        print("  pip install pygame")
        sys.exit(1)

    # Create application config
    config = AppConfig(
        display_hal=hal,
        library_path=str(library_path),
        page_size=(args.width, args.height),
        force_library_mode=args.library,
        log_level=log_level
    )

    # Create application
    app = DReaderApplication(config)

    # Run event loop
    try:
        logger.info("Starting event loop")
        asyncio.run(hal.run_event_loop(app))
        logger.info("Application exited normally")

    except KeyboardInterrupt:
        logger.info("Interrupted by user")
        print("\nShutting down...")

    except Exception as e:
        logger.error(f"Application error: {e}", exc_info=True)
        print(f"\nError: {e}")
        print("\nFor more details, run with --log-level DEBUG")
        sys.exit(1)


if __name__ == "__main__":
    main()