using System.Collections.ObjectModel;
using System.Windows.Input;
using Microsoft.Win32;
using SpdUp.Core;
using SpdUp.Models;
using SpdUp.Services;

namespace SpdUp.ViewModels;

/// <summary>
/// Game Library page – manage detected and manually-added games.
/// </summary>
public sealed class GameLibraryViewModel : ObservableObject
{
    private readonly AppSettings _settings;
    private readonly GameDetectionService _detectionService;

    public ObservableCollection<GameEntry> Games { get; }

    private GameEntry? _selectedGame;
    public GameEntry? SelectedGame
    {
        get => _selectedGame;
        set => SetProperty(ref _selectedGame, value);
    }

    public ICommand AddGameCommand { get; }
    public ICommand RemoveGameCommand { get; }

    public GameLibraryViewModel(AppSettings settings, GameDetectionService detectionService)
    {
        _settings = settings;
        _detectionService = detectionService;
        Games = new ObservableCollection<GameEntry>(_settings.Games);

        AddGameCommand = new RelayCommand(AddGame);
        RemoveGameCommand = new RelayCommand(RemoveGame, () => SelectedGame is not null);
    }

    private void AddGame()
    {
        var dlg = new OpenFileDialog
        {
            Filter = "Executables (*.exe)|*.exe",
            Title = "Select Game Executable"
        };

        if (dlg.ShowDialog() == true)
        {
            var entry = new GameEntry
            {
                Name = System.IO.Path.GetFileNameWithoutExtension(dlg.FileName),
                ExecutablePath = dlg.FileName,
                ProcessName = GameEntry.ProcessNameFromPath(dlg.FileName),
                LauncherSource = "Manual"
            };

            Games.Add(entry);
            _settings.Games.Add(entry);
            _detectionService.AddGameProcess(entry.ProcessName);
            _settings.Save();
        }
    }

    private void RemoveGame()
    {
        if (SelectedGame is null) return;
        _settings.Games.Remove(SelectedGame);
        Games.Remove(SelectedGame);
        _settings.Save();
    }
}