#!/usr/bin/env -S uv run --script
# /// script
# requires-python = ">=3.11"
# dependencies = [
#     "click",
# ]
# ///

import re
import os
import shutil
from pathlib import Path
from collections import defaultdict
import click


def extract_game_title(filename: str) -> str | None:
    """
    Extract the game title from a filename like:
    'Splatoon 2 - 001 - Opening - Wet Floor.mp3'
    Returns: 'Splatoon 2'

    Pattern: Everything before ' - [digits only] - ' is the title
    """
    # Match pattern: ' - [digits] - '
    match = re.match(r'^(.+?)\s+-\s+\d+\s+-\s+.+\.mp3$', filename)
    if match:
        return match.group(1).strip()
    return None


def sanitize_folder_name(name: str) -> str:
    """
    Sanitize a folder name by removing problematic characters.
    - Removes trailing dots (e.g., 'Donkey Kong Jr.' -> 'Donkey Kong Jr')
    - Removes trailing spaces
    """
    return name.rstrip('. ')


def scan_and_group_mp3s(directory: Path) -> dict[str, list[str]]:
    """
    Scan directory for MP3 files and group them by extracted game title.
    Returns: dict mapping game title -> list of filenames
    """
    groups = defaultdict(list)

    for file in directory.glob('*.mp3'):
        filename = file.name
        title = extract_game_title(filename)

        if title:
            groups[title].append(filename)
        else:
            # If we can't extract a title, create a special group
            groups['[Unknown Format]'].append(filename)

    return dict(groups)


def display_group_info(title: str, files: list[str]) -> None:
    """Display information about a group of files."""
    click.echo(f"\n{'='*70}")
    click.secho(f"Vorgeschlagener Ordner: {title}", fg='cyan', bold=True)
    click.secho(f"Anzahl Dateien: {len(files)}", fg='yellow')
    click.echo(f"{'='*70}")

    # Show up to 3 example files
    examples = files[:3]
    click.echo("\nBeispiel-Dateien:")
    for i, filename in enumerate(examples, 1):
        click.echo(f"  {i}. {filename}")

    if len(files) > 3:
        click.secho(f"  ... und {len(files) - 3} weitere", fg='bright_black')


def move_files_to_folder(files: list[str], folder_name: str, source_dir: Path) -> None:
    """Move files to the specified folder."""
    # Sanitize folder name (remove trailing dots, etc.)
    folder_name = sanitize_folder_name(folder_name)
    target_dir = source_dir / folder_name

    # Create folder if it doesn't exist
    target_dir.mkdir(exist_ok=True)

    moved_count = 0
    error_count = 0

    for filename in files:
        source_file = source_dir / filename
        target_file = target_dir / filename

        try:
            if target_file.exists():
                click.secho(f"  ⚠ Übersprungen (existiert bereits): {filename}", fg='yellow')
            else:
                shutil.move(str(source_file), str(target_file))
                moved_count += 1
        except Exception as e:
            click.secho(f"  ✗ Fehler beim Verschieben von {filename}: {e}", fg='red')
            error_count += 1

    if moved_count > 0:
        click.secho(f"  ✓ {moved_count} Datei(en) verschoben nach '{folder_name}'", fg='green')
    if error_count > 0:
        click.secho(f"  ✗ {error_count} Fehler beim Verschieben", fg='red')


@click.command()
@click.option('--auto', is_flag=True, help='Automatisch alle Dateien verschieben ohne Bestätigung')
def main(auto: bool):
    """
    Organisiert MP3-Dateien in Ordner basierend auf dem Spieltitel.

    Scannt das aktuelle Verzeichnis nach MP3-Dateien, extrahiert den Spieltitel
    aus dem Dateinamen und verschiebt die Dateien in entsprechende Ordner.
    """
    current_dir = Path.cwd()

    click.secho("\n🎵 MP3-Datei-Organizer für Nintendo Music\n", fg='green', bold=True)
    click.echo(f"Verzeichnis: {current_dir}\n")

    # Scan and group files
    click.echo("Scanne MP3-Dateien...")
    groups = scan_and_group_mp3s(current_dir)

    if not groups:
        click.secho("Keine MP3-Dateien gefunden!", fg='red')
        return

    # Sort groups by title for consistent ordering
    sorted_groups = sorted(groups.items(), key=lambda x: x[0])

    click.secho(f"\n✓ {len(sorted_groups)} Gruppen gefunden", fg='green')
    click.secho(f"✓ {sum(len(files) for files in groups.values())} Dateien insgesamt", fg='green')

    # Process each group
    processed_count = 0
    skipped_count = 0

    for title, files in sorted_groups:
        display_group_info(title, files)

        if auto:
            # In auto mode, just move everything
            move_files_to_folder(files, title, current_dir)
            processed_count += 1
        else:
            # Interactive mode
            click.echo()
            choice = click.prompt(
                "Aktion? [Y]a / [E]dit / [S]kip",
                type=str,
                default='Y',
                show_default=True
            ).strip().upper()

            if choice == 'Y' or choice == 'YA' or choice == 'J' or choice == 'JA':
                move_files_to_folder(files, title, current_dir)
                processed_count += 1
            elif choice == 'E' or choice == 'EDIT':
                new_name = click.prompt("Neuer Ordnername", type=str, default=title)
                if new_name.strip():
                    move_files_to_folder(files, new_name.strip(), current_dir)
                    processed_count += 1
                else:
                    click.secho("  ⊘ Übersprungen (leerer Name)", fg='yellow')
                    skipped_count += 1
            else:
                click.secho("  ⊘ Übersprungen", fg='yellow')
                skipped_count += 1

    # Summary
    click.echo(f"\n{'='*70}")
    click.secho("Zusammenfassung:", fg='green', bold=True)
    click.echo(f"  Verarbeitet: {processed_count}")
    click.echo(f"  Übersprungen: {skipped_count}")
    click.secho("\n✓ Fertig!", fg='green', bold=True)


if __name__ == '__main__':
    main()