LehrerApp/LehrerApp.Desktop/Views/ClassTeacher/ClassTeacherRegisterView.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 ClassTeacherRegisterView : UserControl
{
    public ClassTeacherRegisterView() => InitializeComponent();

    protected override void OnDataContextChanged(EventArgs e)
    {
        base.OnDataContextChanged(e);
        if (DataContext is not ClassTeacherDetailsViewModel vm) return;
        vm.OnEditOwnDocumentation = ShowDocumentationDialog;
        vm.OnConfirmDeleteOwnDocumentation = ShowDeleteDocumentationDialog;
        vm.OnPickVorgangForPin = ShowPinToVorgangDialog;
    }

    private async Task<PinToVorgangChoice?> ShowPinToVorgangDialog(ClassTeacherClassRegisterRow row)
    {
        if (DataContext is not ClassTeacherDetailsViewModel vm) return null;
        var owner = TopLevel.GetTopLevel(this) as Window;
        if (owner is null) return null;

        var summary = $"{row.DateLabel} · {row.StudentDisplayName} · {row.CategoryName}";
        var matchingCases = vm.OpenCasesFor(row.StudentName);
        var dialogVm = new PinToVorgangDialogViewModel(summary, matchingCases);
        var dialog = new PinToVorgangDialog { DataContext = dialogVm };
        var confirmed = await dialog.ShowDialog<bool>(owner);
        return confirmed ? dialogVm.Result : null;
    }

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

        var vm = new DocumentationDialogViewModel(editing?.StudentId ?? Guid.Empty, 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;
    }

    private async Task<bool> ShowDeleteDocumentationDialog(DocumentationItem item)
    {
        var info = new ConfirmDialogInfo
        {
            Title       = "Eintrag löschen?",
            Message     = $"\"{item.Model.Title}\" ({item.StudentName}) wird als gelöscht markiert und nicht mehr angezeigt.",
            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);
    }
}