LehrerApp/LehrerApp.Desktop/Views/Settings/SettingsView.axaml.cs

using Avalonia.Controls;
using Avalonia.Interactivity;
using Avalonia.Platform.Storage;
using LehrerApp.Desktop.ViewModels;
using LehrerApp.Desktop.ViewModels.Settings;
using LehrerApp.Desktop.Views.Shared;
using Microsoft.Extensions.DependencyInjection;

namespace LehrerApp.Desktop.Views.Settings;

public partial class SettingsView : UserControl
{
    public SettingsView() => InitializeComponent();

    protected override void OnDataContextChanged(EventArgs e)
    {
        base.OnDataContextChanged(e);
        if (DataContext is SettingsViewModel vm)
        {
            vm.OnConfirmRestore = ShowRestoreConfirmDialog;
            vm.OnAppLockChanged = () => App.Services.GetRequiredService<AppLockViewModel>().ApplyConfig();
        }
    }

    private async Task<bool> ShowRestoreConfirmDialog(BackupListItem item)
    {
        var info = new ConfirmDialogInfo
        {
            Title       = "Backup wiederherstellen?",
            Message     = $"Die aktuelle Datenbank wird durch das Backup vom {item.Display} ersetzt. " +
                          "Die App wird danach automatisch neu gestartet.",
            ConfirmText = "Wiederherstellen",
        };
        var dialog = new ConfirmDialog { DataContext = info };
        var owner = TopLevel.GetTopLevel(this) as Window;
        return owner is not null && await dialog.ShowDialog<bool>(owner);
    }

    private async void OnImportClick(object? sender, RoutedEventArgs e)
    {
        var topLevel = TopLevel.GetTopLevel(this);
        if (topLevel is null || DataContext is not SettingsViewModel vm) return;

        var files = await topLevel.StorageProvider.OpenFilePickerAsync(new FilePickerOpenOptions
        {
            Title         = "Kompetenzkatalog importieren",
            AllowMultiple = false,
            FileTypeFilter = [new FilePickerFileType("JSON-Dateien") { Patterns = ["*.json"] }],
        });

        if (files.Count == 0) return;
        var json = await File.ReadAllTextAsync(files[0].Path.LocalPath);
        vm.ImportCatalog(json);
    }

    private async void OnExportClick(object? sender, RoutedEventArgs e)
    {
        var topLevel = TopLevel.GetTopLevel(this);
        if (topLevel is null || DataContext is not SettingsViewModel vm) return;

        var file = await topLevel.StorageProvider.SaveFilePickerAsync(new FilePickerSaveOptions
        {
            Title             = "Kompetenzkatalog exportieren",
            SuggestedFileName = $"Kompetenzkatalog_{vm.CatalogSubject?.Name}_{vm.CatalogGradeLevel}.json",
            FileTypeChoices   = [new FilePickerFileType("JSON-Dateien") { Patterns = ["*.json"] }],
        });

        if (file is null) return;
        var json = vm.ExportCatalog();
        await File.WriteAllTextAsync(file.Path.LocalPath, json);
    }

    private async void OnEditGradingKeyTemplateClick(object? sender, RoutedEventArgs e)
    {
        if (sender is not Button { Tag: GradingKeyTemplateEditItem item }) return;
        var dialog = new GradingKeyTemplateDialog { DataContext = item };
        var owner = TopLevel.GetTopLevel(this) as Window;
        if (owner is not null) await dialog.ShowDialog(owner);
    }
}