72 lines
3.0 KiB
C#
72 lines
3.0 KiB
C#
using Avalonia.Controls;
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using Avalonia.Interactivity;
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using Avalonia.Platform.Storage;
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using LehrerApp.Core.Importing;
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using LehrerApp.Core.Services;
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using LehrerApp.Desktop.Services;
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using LehrerApp.Desktop.ViewModels.Students;
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using Microsoft.Extensions.DependencyInjection;
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namespace LehrerApp.Desktop.Views.Students;
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public partial class StudentListView : UserControl
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{
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private const int MaximumImportFileSize = 20 * 1024 * 1024;
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public StudentListView() => InitializeComponent();
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private async void OnImportClick(object? sender, RoutedEventArgs e)
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{
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var owner = TopLevel.GetTopLevel(this) as Window;
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if (owner is null || DataContext is not StudentListViewModel list) return;
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var service = App.Services.GetRequiredService<StudentImportService>();
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var patterns = service.SupportedExtensions.Select(extension => $"*{extension}").ToArray();
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var files = await owner.StorageProvider.OpenFilePickerAsync(new FilePickerOpenOptions
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{
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Title = "Schüler-Stammdaten importieren",
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AllowMultiple = false,
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FileTypeFilter =
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[
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new FilePickerFileType("Unterstützte Schülerlisten")
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{
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Patterns = patterns.Length > 0 ? patterns : ["*.csv"],
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},
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],
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});
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if (files.Count == 0) return;
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try
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{
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await using var source = await files[0].OpenReadAsync();
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if (source.CanSeek && source.Length > MaximumImportFileSize)
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throw new InvalidDataException("Die Importdatei ist größer als 20 MB.");
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using var buffer = new MemoryStream();
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await source.CopyToAsync(buffer);
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if (buffer.Length > MaximumImportFileSize)
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throw new InvalidDataException("Die Importdatei ist größer als 20 MB.");
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var importFile = new ImportFile(files[0].Name, buffer.ToArray());
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var preview = await Task.Run(async () =>
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await service.AnalyzeAsync(importFile).ConfigureAwait(false));
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var dialogVm = new StudentImportDialogViewModel(service, preview, files[0].Name);
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var dialog = new StudentImportDialog { DataContext = dialogVm };
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if (!await dialog.ShowDialog<bool>(owner)) return;
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list.LoadStudents();
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var result = dialogVm.Result!;
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App.Services.GetRequiredService<NotificationService>().ShowSuccess(
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$"Import abgeschlossen: {result.CreatedStudents} neu, {result.UpdatedStudents} ergänzt, "
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+ $"{result.CreatedMemberships} Gruppenzuordnungen.");
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}
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catch (Exception ex) when (ex is ImportFormatException
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or InvalidDataException
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or IOException
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or UnauthorizedAccessException)
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{
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App.Services.GetRequiredService<NotificationService>().ShowError(ex.Message);
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}
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}
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}
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