// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file, You can obtain one at https://opensource.org/licenses/MIT.
// Copyright (C) Leszek Pomianowski and WPF UI Contributors.
// All Rights Reserved.

using Wpf.Ui.Appearance;
using Wpf.Ui.Controls;

namespace DownloadManager.ViewModels.Pages;
public partial class SettingsViewModel : ObservableObject, INavigationAware
{
    private bool _isInitialized = false;

    [ObservableProperty]
    private string _appVersion = String.Empty;

    [ObservableProperty]
    private ApplicationTheme _currentTheme = ApplicationTheme.Unknown;

    public void OnNavigatedTo()
    {
        if (!_isInitialized)
            InitializeViewModel();
    }

    public void OnNavigatedFrom()
    {
    }

    private void InitializeViewModel()
    {
        CurrentTheme = ApplicationThemeManager.GetAppTheme();
        AppVersion = $"UiDesktopApp1 - {GetAssemblyVersion()}";

        _isInitialized = true;
    }

    private string GetAssemblyVersion()
    {
        return System.Reflection.Assembly.GetExecutingAssembly().GetName().Version?.ToString()
            ?? String.Empty;
    }

    [RelayCommand]
    private void OnChangeTheme(string parameter)
    {
        switch (parameter)
        {
            case "theme_light":
                if (CurrentTheme == ApplicationTheme.Light)
                    break;

                ApplicationThemeManager.Apply(ApplicationTheme.Light);
                CurrentTheme = ApplicationTheme.Light;

                break;

            default:
                if (CurrentTheme == ApplicationTheme.Dark)
                    break;

                ApplicationThemeManager.Apply(ApplicationTheme.Dark);
                CurrentTheme = ApplicationTheme.Dark;

                break;
        }
    }
}