LehrerApp/LehrerApp.Desktop/Views/ClassTeacher/ClassTeacherCasesView.axaml.cs

using Avalonia.Controls;
using LehrerApp.Core.Interfaces;
using LehrerApp.Core.Models;
using LehrerApp.Desktop.ViewModels.ClassTeacher;
using LehrerApp.Desktop.ViewModels.Students;
using LehrerApp.Desktop.Views.Shared;
using LehrerApp.Desktop.Views.Students;
using Microsoft.Extensions.DependencyInjection;

namespace LehrerApp.Desktop.Views.ClassTeacher;

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

    protected override void OnDataContextChanged(EventArgs e)
    {
        base.OnDataContextChanged(e);
        if (DataContext is not ClassTeacherCasesViewModel vm) return;
        vm.OnEditVorgang = ShowVorgangDialog;
        vm.OnConfirmDeleteVorgang = ShowDeleteVorgangDialog;
        vm.OnEditDocumentation = ShowDocumentationDialog;
    }

    private async Task<Vorgang?> ShowVorgangDialog(List<StudentOption> rosterStudents, Vorgang? editing)
    {
        var owner = TopLevel.GetTopLevel(this) as Window;
        if (owner is null) return null;

        var vm = new VorgangDialogViewModel(rosterStudents, editing);
        var dialog = new VorgangDialog { DataContext = vm };
        var saved = await dialog.ShowDialog<bool>(owner);
        return saved ? vm.Result : null;
    }

    private async Task<bool> ShowDeleteVorgangDialog(VorgangItem item)
    {
        var info = new ConfirmDialogInfo
        {
            Title       = "Vorgang löschen?",
            Message     = $"\"{item.Model.Title}\" wird als gelöscht markiert und nicht mehr angezeigt. " +
                          "Verknüpfte Dokumentation bleibt erhalten.",
            ConfirmText = "Löschen",
        };
        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 Task<Documentation?> ShowDocumentationDialog(
        Guid defaultStudentId, List<StudentOption> studentOptions, Documentation? editing)
    {
        var owner = TopLevel.GetTopLevel(this) as Window;
        if (owner is null) return null;

        var vm = new DocumentationDialogViewModel(defaultStudentId, editing,
            App.Services.GetRequiredService<IAttachmentStorage>(), studentOptions);
        var dialog = new DocumentationDialog { DataContext = vm };
        var saved = await dialog.ShowDialog<bool>(owner);
        if (!saved) vm.DiscardUnsavedAttachments();
        return saved ? vm.Result : null;
    }
}