Stundenplan verbesserung

LehrerApp.Desktop/ViewModels/Groups/GroupOverviewViewModel.cs

@@ -138,7 +138,7 @@ public partial class GroupOverviewViewModel : ObservableObject
     private void LoadNextLesson(DateOnly today)
     {
         var next = _lessons.GetByGroupAndRange(_groupId, today, today.AddDays(NextLessonLookaheadDays))
-            .Where(l => l.Status == LessonStatus.Planned)
+            .Where(l => l.Status != LessonStatus.Conducted)
             .OrderBy(l => l.Date).ThenBy(l => l.LessonNumber ?? 0)
             .FirstOrDefault();
 

LehrerApp.Desktop/ViewModels/Groups/PlanningViewModels.cs

@@ -13,7 +13,8 @@ namespace LehrerApp.Desktop.ViewModels.Groups;
 
 // ── Ergebnisse der Verschieben-/Kopieren-/Serienerzeugungs-Dialoge (4.2.4 / 4.1.4 / 4.2.5) ───
 
-public record MoveLessonTarget(DateOnly NewDate, bool ShiftFollowing);
+public record MoveLessonTarget(DateOnly NewDate, bool ShiftFollowing, int? NewPeriod = null,
+    bool SplitDoubleLesson = false);
 public record CopyUnitTarget(Guid TargetGroupId, DateOnly AnchorDate);
 
 public record LessonSeriesResult(int Created, int SkippedHoliday, int SkippedExisting)
@@ -78,6 +79,7 @@ public partial class PlanningTabViewModel : ObservableObject
     public Func<Unit, Task<LessonSeriesResult?>>? OnGenerateLessonSeries { get; set; }
     public Func<Unit, Task<bool>>? OnAiAssist { get; set; }
     public Action<string>? OnNotify { get; set; }
+    public Action<string>? OnError { get; set; }
 
     public PlanningTabViewModel(IUnitRepository units, ILessonRepository lessons,
         IGroupRepository groups, ISubjectRepository subjects,
@@ -333,7 +335,8 @@ public partial class PlanningTabViewModel : ObservableObject
         var lesson = SelectedLesson.Model;
         var target = await OnPickMoveTarget(lesson);
         if (target is null) return;
-        MoveLessonInternal(lesson, target.NewDate, target.ShiftFollowing);
+        try { MoveLessonInternal(lesson, target.NewDate, target.ShiftFollowing, target.NewPeriod); }
+        catch (InvalidOperationException ex) { OnError?.Invoke(ex.Message); return; }
         LoadUnits();
     }
 
@@ -341,33 +344,19 @@ public partial class PlanningTabViewModel : ObservableObject
     /// sich alle anderen noch geplanten Stunden derselben Einheit, die ursprünglich NACH der
     /// verschobenen Stunde lagen, um denselben Tages-Delta. Bereits durchgeführte Stunden werden
     /// nie angefasst — nur Date ändert sich, UnitId/GroupId bleiben unverändert.
-    private void MoveLessonInternal(Lesson moved, DateOnly newDate, bool shiftFollowing)
+    private void MoveLessonInternal(Lesson moved, DateOnly newDate, bool shiftFollowing, int? newPeriod = null)
     {
-        var oldDate = moved.Date;
-        var delta = newDate.DayNumber - oldDate.DayNumber;
-
-        if (shiftFollowing && delta != 0)
-        {
-            foreach (var other in _lessons.GetByUnit(moved.UnitId))
-            {
-                if (other.Id == moved.Id) continue;
-                if (other.Status != LessonStatus.Planned) continue;
-                if (other.Date <= oldDate) continue;
-                other.Date = other.Date.AddDays(delta);
-                _lessons.Save(other);
-            }
-        }
-
-        moved.Date = newDate;
-        _lessons.Save(moved);
+        new LessonSchedulingService(_lessons).Move(moved, newDate, newPeriod, shiftFollowing);
     }
 
     [RelayCommand(CanExecute = nameof(HasSelectedLesson))]
     private void AdvanceLessonStatus()
     {
-        if (SelectedLesson is null || SelectedLesson.Model.Status != LessonStatus.Planned) return;
+        if (SelectedLesson is null || SelectedLesson.Model.Status == LessonStatus.Conducted) return;
         var lesson = SelectedLesson.Model;
-        lesson.Status = LessonStatus.Conducted;
+        lesson.Status = lesson.Status == LessonStatus.Ready
+            ? LessonStatus.Conducted
+            : LessonStatus.Ready;
         _lessons.Save(lesson);
         LoadUnits();
     }
@@ -479,8 +468,14 @@ public class LessonSummary
         Topic = l.Topic;
         StartTimeDisplay = l.StartTime?.ToString("HH:mm") ?? "–";
         Status = l.Status;
-        StatusLabel = l.Status == LessonStatus.Conducted ? "Durchgeführt" : "Geplant";
-        StatusColorHex = l.Status == LessonStatus.Conducted ? "#43A047" : "#9E9E9E";
+        StatusLabel = LessonStatusDisplay.ToName(l.Status);
+        StatusColorHex = l.Status switch
+        {
+            LessonStatus.Draft => "#78909C",
+            LessonStatus.Ready => "#1976D2",
+            LessonStatus.Conducted => "#43A047",
+            _ => "#9E9E9E",
+        };
         PhaseCountLabel = l.Phases.Count == 0 ? "–" : $"{l.Phases.Count} Phasen";
         var totalMinutes = l.Phases.Sum(p => p.DurationMinutes);
         TotalDurationLabel = totalMinutes == 0 ? "–" : $"{totalMinutes} Min.";
@@ -515,12 +510,23 @@ public static class UnitStatusDisplay
 
 public static class LessonStatusDisplay
 {
-    public static string[] Options { get; } = ["Geplant", "Durchgeführt"];
+    public static string[] Options { get; } = ["Entwurf", "Geplant", "Bereit", "Durchgeführt"];
 
-    public static string ToName(LessonStatus s) => s == LessonStatus.Conducted ? "Durchgeführt" : "Geplant";
+    public static string ToName(LessonStatus s) => s switch
+    {
+        LessonStatus.Draft => "Entwurf",
+        LessonStatus.Ready => "Bereit",
+        LessonStatus.Conducted => "Durchgeführt",
+        _ => "Geplant",
+    };
 
-    public static LessonStatus FromName(string? name) =>
-        name == "Durchgeführt" ? LessonStatus.Conducted : LessonStatus.Planned;
+    public static LessonStatus FromName(string? name) => name switch
+    {
+        "Entwurf" => LessonStatus.Draft,
+        "Bereit" => LessonStatus.Ready,
+        "Durchgeführt" => LessonStatus.Conducted,
+        _ => LessonStatus.Planned,
+    };
 }
 
 // ── Dialog: Einheit anlegen / bearbeiten (4.1.2 / 4.1.3) ─────────────────────
@@ -722,7 +728,8 @@ public partial class LessonDialogViewModel : ObservableObject
         IAlternativeLessonPathRepository alternativePaths, ITimetableSlotRepository timetableSlots,
         PeriodScheduleService periodSchedule, IAttachmentStorage attachmentStorage,
         Guid unitId, Guid groupId, string groupName, string subjectName,
-        List<string> materialSuggestions, List<string> shorthandHistorySuggestions, Lesson? editingLesson)
+        List<string> materialSuggestions, List<string> shorthandHistorySuggestions, Lesson? editingLesson,
+        DateOnly? suggestedDate = null, int? suggestedPeriod = null)
     {
         _lessons = lessons; _alternativePaths = alternativePaths;
         _timetableSlots = timetableSlots; _periodSchedule = periodSchedule;
@@ -760,9 +767,12 @@ public partial class LessonDialogViewModel : ObservableObject
         }
         else
         {
-            var (date, lessonNumber) = SuggestNextLesson();
+            var (date, lessonNumber) = suggestedDate.HasValue
+                ? (suggestedDate.Value, suggestedPeriod)
+                : SuggestNextLesson();
             DateText = date.ToString("dd.MM.yyyy");
             LessonNumber = lessonNumber;
+            StatusName = LessonStatusDisplay.ToName(LessonStatus.Draft);
         }
         RecomputeTimes();
     }
@@ -1145,28 +1155,45 @@ public partial class AlternativePathDialogViewModel : ObservableObject
 public partial class MoveLessonDialogViewModel : ObservableObject
 {
     [ObservableProperty] private string _newDateText;
+    [ObservableProperty] private int? _newPeriod;
     [ObservableProperty] private bool _shiftFollowingPlanned = true;
+    [ObservableProperty] private bool _splitDoubleLesson;
     [ObservableProperty] private string _newDateTextError = "";
+    [ObservableProperty] private string _newPeriodError = "";
 
     public string CurrentDateDisplay { get; }
+    public string CurrentPeriodDisplay { get; }
+    public bool CanSplitDoubleLesson { get; }
     public MoveLessonTarget? Result { get; private set; }
 
-    public MoveLessonDialogViewModel(DateOnly currentDate)
+    public MoveLessonDialogViewModel(DateOnly currentDate, int? currentPeriod = null,
+        bool canSplitDoubleLesson = false, bool splitByDefault = false)
     {
         CurrentDateDisplay = currentDate.ToString("dd.MM.yyyy");
+        CurrentPeriodDisplay = currentPeriod is null ? "nicht festgelegt" : $"{currentPeriod}. Stunde";
         _newDateText = currentDate.ToString("dd.MM.yyyy");
+        _newPeriod = currentPeriod;
+        CanSplitDoubleLesson = canSplitDoubleLesson;
+        _splitDoubleLesson = canSplitDoubleLesson && splitByDefault;
     }
 
     [RelayCommand]
     private void Save()
     {
         NewDateTextError = "";
+        NewPeriodError = "";
         if (!DateOnly.TryParseExact(NewDateText, "dd.MM.yyyy", null, DateTimeStyles.None, out var date))
         {
             NewDateTextError = "Format TT.MM.JJJJ.";
             return;
         }
-        Result = new MoveLessonTarget(date, ShiftFollowingPlanned);
+        if (NewPeriod is < 1 or > 20)
+        {
+            NewPeriodError = "Bitte eine Stundennummer zwischen 1 und 20 wählen.";
+            return;
+        }
+        Result = new MoveLessonTarget(date, ShiftFollowingPlanned, NewPeriod,
+            CanSplitDoubleLesson && SplitDoubleLesson);
     }
 }
 

LehrerApp.Desktop/ViewModels/Planning/TimetableLessonWorkflowViewModels.cs

@@ -0,0 +1,83 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using LehrerApp.Core.Interfaces;
+using LehrerApp.Core.Models;
+using System.Collections.ObjectModel;
+
+namespace LehrerApp.Desktop.ViewModels.Planning;
+
+public sealed class TimetableUnitOption(Unit unit)
+{
+    public Unit Model { get; } = unit;
+    public string Label { get; } = unit.Title;
+    public string Detail { get; } = unit.Status switch
+    {
+        UnitStatus.Active => "Laufende Einheit",
+        UnitStatus.Completed => "Abgeschlossene Einheit",
+        _ => "Geplante Einheit",
+    };
+}
+
+/// <summary>Ordnet eine direkt aus dem Stundenplan angelegte Stunde einer Einheit zu.</summary>
+public partial class TimetableUnitPickerViewModel : ObservableObject
+{
+    private readonly IUnitRepository _units;
+    private readonly Guid _groupId;
+    private readonly DateOnly _date;
+
+    public string ContextLabel { get; }
+    public ObservableCollection<TimetableUnitOption> Units { get; } = [];
+    [ObservableProperty] private TimetableUnitOption? _selectedUnit;
+    [ObservableProperty] private string _newUnitTitle = "";
+    [ObservableProperty] private string _error = "";
+    public Unit? Result { get; private set; }
+    public bool ResultIsNew { get; private set; }
+    public bool HasUnits => Units.Count > 0;
+
+    public TimetableUnitPickerViewModel(IUnitRepository units, Guid groupId, string groupName,
+        DateOnly date, int period)
+    {
+        _units = units;
+        _groupId = groupId;
+        _date = date;
+        ContextLabel = $"{groupName} · {date:dd.MM.yyyy} · {period}. Stunde";
+
+        foreach (var unit in units.GetByGroup(groupId)
+                     .OrderBy(u => u.Status == UnitStatus.Active ? 0 : u.Status == UnitStatus.Planned ? 1 : 2)
+                     .ThenByDescending(u => u.StartDate)
+                     .ThenBy(u => u.Title, StringComparer.CurrentCultureIgnoreCase))
+            Units.Add(new TimetableUnitOption(unit));
+        SelectedUnit = Units.FirstOrDefault();
+    }
+
+    [RelayCommand]
+    private void Save()
+    {
+        Error = "";
+        if (!string.IsNullOrWhiteSpace(NewUnitTitle))
+        {
+            Result = new Unit
+            {
+                GroupId = _groupId,
+                Title = NewUnitTitle.Trim(),
+                StartDate = _date,
+                Status = UnitStatus.Active,
+            };
+            // Erst speichern, wenn auch der anschließende Stunden-Dialog bestätigt wurde. So
+            // hinterlässt ein Abbruch keine leere Einheit.
+            ResultIsNew = true;
+            return;
+        }
+
+        if (SelectedUnit is null)
+        {
+            Error = "Bitte eine Einheit auswählen oder eine neue benennen.";
+            return;
+        }
+        Result = SelectedUnit.Model;
+        ResultIsNew = false;
+    }
+}
+
+public sealed record TimetableLessonRequest(Guid GroupId, DateOnly Date, int PeriodNumber);
+public sealed record TimetableLessonMoveRequest(Lesson Lesson, int SelectedPeriod);

LehrerApp.Desktop/ViewModels/Planning/TimetableViewModel.cs

@@ -5,6 +5,7 @@ using LehrerApp.Core.Models;
 using LehrerApp.Core.Services;
 using LehrerApp.Desktop.Services;
 using LehrerApp.Desktop.ViewModels.Settings;
+using LehrerApp.Desktop.ViewModels.Groups;
 using System.Collections.ObjectModel;
 
 namespace LehrerApp.Desktop.ViewModels.Planning;
@@ -108,6 +109,8 @@ public partial class TimetableViewModel : ObservableObject
     public Action<SettingsTab>? OnNavigateToSettings { get; set; }
     public Func<Lesson, Task>? OnOpenLessonViewer { get; set; }
     public Func<Lesson, Task>? OnOpenTeachingMode { get; set; }
+    public Func<TimetableLessonRequest, Task>? OnCreateLesson { get; set; }
+    public Func<TimetableLessonMoveRequest, Task>? OnMoveLesson { get; set; }
 
     /// Öffentlich statt intern (kein InternalsVisibleTo in dieser Codebasis) - erlaubt Tests, die
     /// "heute"-abhängiges Verhalten (Wochenraster-Badges, Unterrichtszeit-Erkennung) prüfen, ohne
@@ -301,9 +304,9 @@ public partial class TimetableViewModel : ObservableObject
             var cancelled = substitutionsToday.FirstOrDefault(s => s.Kind == SubstitutionKind.Cancelled && s.PeriodNumber == slot.PeriodNumber);
             if (cancelled is not null) { items.Add(TodayLessonItem.ForCancelled(slot.GroupId, slot.PeriodNumber, group.Name, cancelled)); continue; }
 
-            var lesson = _lessons.GetByGroupAndDate(slot.GroupId, today).FirstOrDefault();
+            var lesson = FindLessonForSlot(slot.GroupId, today, slot.PeriodNumber);
             var exam = _exams.GetByGroup(slot.GroupId).FirstOrDefault(e => e.Date == today);
-            items.Add(new TodayLessonItem(slot.GroupId, slot.PeriodNumber, group.Name,
+            items.Add(new TodayLessonItem(slot.GroupId, today, slot.PeriodNumber, group.Name,
                 slot.Room ?? "", ColorFor(group.Name), lesson?.Topic, exam?.Title,
                 HasUnhandledHomework(slot.GroupId, today), lesson));
         }
@@ -353,15 +356,15 @@ public partial class TimetableViewModel : ObservableObject
     }
 
     /// Springt aus dem Stundenplan direkt in den Verlaufsplan-Viewer der zugehörigen Lesson (4.5.2)
-    /// — sofern für den Slot schon eine Lesson existiert. Ohne Lesson (Slot laut Stundenplan belegt,
-    /// aber noch keine konkrete Stunde geplant) bleibt es bei der bisherigen, gröberen Navigation
-    /// zum Planung-Tab der Gruppe: eine neue Lesson direkt von hier aus anzulegen bräuchte eine
-    /// Antwort auf "welcher Unit wird sie zugeordnet", die bewusst noch offen ist (siehe TODO 4.5.2).
+    /// — sofern für den Slot schon eine Lesson existiert. Ohne Lesson startet die Direktanlage;
+    /// der vorgeschaltete Einheiten-Dialog löst dabei die notwendige Unit-Zuordnung explizit.
     [RelayCommand]
     private async Task OpenTodayLesson(TodayLessonItem? item)
     {
         if (item is null || item.GroupId == Guid.Empty) return;
         if (item.Lesson is { } lesson && OnOpenLessonViewer is not null) await OnOpenLessonViewer(lesson);
+        else if (OnCreateLesson is not null)
+            await OnCreateLesson(new TimetableLessonRequest(item.GroupId, item.Date, item.PeriodNumber));
         else OnNavigateToGroup?.Invoke(item.GroupId);
     }
 
@@ -380,7 +383,7 @@ public partial class TimetableViewModel : ObservableObject
     /// nach der Stunde) Unterrichtszeit, geht es direkt in den Unterrichtsmodus — sonst wie
     /// bisher in den (schreibgeschützten) Planungsviewer bzw., ohne Lesson, zur Einheitenplanung
     /// der Gruppe. Das Popup-Menü (siehe TimetableView.axaml, MenuFlyout je Kachel) bietet
-    /// daneben immer alle vier Ziele explizit an, unabhängig von dieser Automatik.
+    /// daneben die weiteren Ziele (einschließlich Anlegen/Verschieben) explizit an.
     [RelayCommand]
     private async Task OpenWeekCell(WeekCellItem? item)
     {
@@ -391,6 +394,8 @@ public partial class TimetableViewModel : ObservableObject
                 await OnOpenTeachingMode(lesson);
             else if (OnOpenLessonViewer is not null) await OnOpenLessonViewer(lesson);
         }
+        else if (item.Date is { } date && OnCreateLesson is not null)
+            await OnCreateLesson(new TimetableLessonRequest(item.GroupId, date, item.PeriodNumber));
         else OnNavigateToGroup?.Invoke(item.GroupId);
     }
 
@@ -399,16 +404,20 @@ public partial class TimetableViewModel : ObservableObject
     /// Start-/Endzeit gebunden — man klickt auch kurz vor Stundenbeginn oder in einer kurzen
     /// Verzögerung danach noch typischerweise in Unterrichtsabsicht. Ohne konfiguriertes
     /// Stundenraster oder an einem anderen Tag als heute bleibt es beim Planungsviewer.
-    /// Nimmt bewusst das Datum der Lesson selbst statt WeekCellItem.Date entgegen — Date ist dort
-    /// nur bei Kopfzeilen (WeekdayHeader) gesetzt, nicht bei regulären Stunden-Kacheln (ForSlot).
+    /// Nimmt das Datum der Lesson selbst entgegen; die Kachel trägt ihr Datum zusätzlich für die
+    /// Direktanlage einer noch nicht existierenden Stunde.
     private static readonly TimeSpan TeachingTimeTolerance = TimeSpan.FromMinutes(10);
     private bool IsAroundTeachingTime(DateOnly lessonDate, int periodNumber)
     {
         var nowSnapshot = Clock();
         if (lessonDate != DateOnly.FromDateTime(nowSnapshot)) return false;
         if (_periodSchedule.GetTimes(periodNumber) is not { } times) return false;
-        var now = TimeOnly.FromDateTime(nowSnapshot);
-        return now >= times.Start.Add(-TeachingTimeTolerance) && now <= times.End.Add(TeachingTimeTolerance);
+        // DateTime statt TimeOnly.Add: Letzteres springt nahe Mitternacht auf den anderen
+        // Tagesrand und macht aus z.B. 00:05 ± 10 Minuten ein umgekehrtes Vergleichsfenster.
+        var start = lessonDate.ToDateTime(times.Start).Subtract(TeachingTimeTolerance);
+        var end = lessonDate.ToDateTime(times.End).Add(TeachingTimeTolerance);
+        if (end < start) end = end.AddDays(1); // nur für ein ggf. über Mitternacht laufendes Raster
+        return nowSnapshot >= start && nowSnapshot <= end;
     }
 
     [RelayCommand]
@@ -487,14 +496,14 @@ public partial class TimetableViewModel : ObservableObject
                     continue;
                 }
 
-                var lesson = _lessons.GetByGroupAndDate(slot.GroupId, date).FirstOrDefault();
+                var lesson = FindLessonForSlot(slot.GroupId, date, period);
                 var hasExam = _exams.GetByGroup(slot.GroupId).Any(e => e.Date == date);
                 var isHoliday = IsFreeDay(date, schoolHolidays, publicHolidayDates);
                 var colorHex = isHoliday ? "#BDBDBD" : ColorFor(group?.Name ?? "");
                 var holidayBadge = HolidayBadgeFor(date, weekday, schoolHolidays, publicHolidayDates);
                 var isLastBeforeExam = IsLastBeforeExamFor(date, weekday, slot.GroupId, publicHolidayDates);
 
-                WeekItems.Add(WeekCellItem.ForSlot(weekday, period, date == today,
+                WeekItems.Add(WeekCellItem.ForSlot(weekday, period, date == today, date,
                     subject?.ShortName is { Length: > 0 } sn ? sn : subject?.Name ?? "",
                     group?.Name ?? "?", slot.Room ?? "", lesson?.Topic ?? "",
                     colorHex, holidayBadge, hasExam, isLastBeforeExam,
@@ -560,6 +569,31 @@ public partial class TimetableViewModel : ObservableObject
              p.Activity?.Contains("Experiment", StringComparison.OrdinalIgnoreCase) == true ||
              p.Material?.Contains("Experiment", StringComparison.OrdinalIgnoreCase) == true)) == true;
 
+    /// Eine Doppelstunde wird als eine Lesson an der ersten Periode gespeichert. Für die zweite
+    /// Rasterzelle liefern wir dieselbe Lesson nur dann, wenn der Stundenplan dort unmittelbar
+    /// fortgesetzt wird und der geplante Verlauf länger als die erste Periode ist. Eine exakt an
+    /// der Zielperiode verankerte Lesson hat immer Vorrang.
+    private Lesson? FindLessonForSlot(Guid groupId, DateOnly date, int period)
+    {
+        var lessons = _lessons.GetByGroupAndDate(groupId, date);
+        var exact = lessons.FirstOrDefault(l => l.LessonNumber == period);
+        if (exact is not null) return exact;
+        // Historische/manuell angelegte Einträge hatten häufig keine Stundennummer. Solange es
+        // davon nur einen an diesem Tag gibt, bleibt das frühere Verhalten erhalten und er wird
+        // dem vorhandenen Gruppen-Slot zugeordnet.
+        var withoutPeriod = lessons.Where(l => l.LessonNumber is null).ToList();
+        if (withoutPeriod.Count == 1) return withoutPeriod[0];
+
+        var previous = lessons.Where(l => l.LessonNumber is int p && p == period - 1)
+            .OrderByDescending(l => l.UpdatedAt).FirstOrDefault();
+        if (previous?.LessonNumber is not int anchor) return null;
+        var isConsecutiveSlot = _slots.GetByGroup(groupId)
+            .Any(s => s.Weekday == date.DayOfWeek && s.PeriodNumber == period);
+        var firstPeriodMinutes = _periodSchedule.GetDurationMinutes(anchor);
+        return isConsecutiveSlot && firstPeriodMinutes > 0 &&
+            previous.Phases.Sum(p => p.DurationMinutes) > firstPeriodMinutes ? previous : null;
+    }
+
     /// <summary>4.5.4: Hat die letzte vor <paramref name="date"/> liegende Lesson dieser Gruppe eine
     /// Hausaufgabe, die weder als kontrolliert noch als bewusst übersprungen markiert ist? Schaut
     /// bewusst nur auf die unmittelbar vorherige Lesson (nicht auf die gesamte Historie) — sobald
@@ -824,7 +858,9 @@ public partial class WeekCellItem : ObservableObject
     /// Grundlage für den Direktsprung in den Verlaufsplan-Viewer (4.5.2).
     public Lesson? Lesson { get; private init; }
     public bool HasLesson => Lesson is not null;
-    public string OpenButtonLabel => Lesson is not null ? "Verlaufsplan ansehen" : "Zur Lerngruppe";
+    public bool HasNoLesson => Lesson is null;
+    public string PlanningStatusLabel => Lesson is null ? "Nicht geplant" : LessonStatusDisplay.ToName(Lesson.Status);
+    public string OpenButtonLabel => Lesson is not null ? "Verlaufsplan ansehen" : "Stunde anlegen";
     [ObservableProperty] private string _weatherSymbol = "";
     [ObservableProperty] private string _weatherTooltip = "";
     [ObservableProperty] private bool _hasWeatherWarning;
@@ -879,18 +915,28 @@ public partial class WeekCellItem : ObservableObject
         IsSubstitutionSupervision = isSubstitution,
     };
 
-    public static WeekCellItem ForSlot(DayOfWeek day, int period, bool isToday, string subjectLabel,
+    public static WeekCellItem ForSlot(DayOfWeek day, int period, bool isToday, DateOnly date, string subjectLabel,
         string groupName, string room, string topic, string colorHex, string holidayBadge,
         bool hasExam, bool isLastBeforeExam, bool hasExperiment, Guid groupId, bool isHoliday,
         bool hasUnhandledHomework = false, Lesson? lesson = null) => new()
     {
-        Weekday = day, PeriodNumber = period, IsAssigned = true, IsToday = isToday,
+        Weekday = day, PeriodNumber = period, IsAssigned = true, IsToday = isToday, Date = date,
         SubjectLabel = subjectLabel, GroupName = groupName, Room = room, Topic = topic,
         ColorHex = colorHex, HolidayBadge = holidayBadge, HasExam = hasExam,
         IsLastBeforeExam = isLastBeforeExam, HasExperiment = hasExperiment, GroupId = groupId,
         IsHoliday = isHoliday, HasUnhandledHomework = hasUnhandledHomework, Lesson = lesson,
     };
 
+    // Kompatible Überladung für isolierte ViewModel-Tests und ältere Aufrufer ohne konkreten
+    // Wochenbezug. Produktiv wird die datierte Variante verwendet.
+    public static WeekCellItem ForSlot(DayOfWeek day, int period, bool isToday, string subjectLabel,
+        string groupName, string room, string topic, string colorHex, string holidayBadge,
+        bool hasExam, bool isLastBeforeExam, bool hasExperiment, Guid groupId, bool isHoliday,
+        bool hasUnhandledHomework = false, Lesson? lesson = null) => ForSlot(day, period, isToday,
+            DateOnly.FromDateTime(DateTime.Today), subjectLabel, groupName, room, topic, colorHex,
+            holidayBadge, hasExam, isLastBeforeExam, hasExperiment, groupId, isHoliday,
+            hasUnhandledHomework, lesson);
+
     public static WeekCellItem ForSubstitutionLesson(DayOfWeek day, int period, bool isToday, SubstitutionEntry entry) => new()
     {
         Weekday = day, PeriodNumber = period, IsAssigned = true, IsToday = isToday, IsSubstitutionLesson = true,
@@ -937,12 +983,13 @@ public class UpcomingExamItem(DateOnly date, string groupName, string title)
     public string Title { get; } = title;
 }
 
-public enum TimetableLessonDestination { TeachingMode, Viewer, SeatingPlan, Planning }
+public enum TimetableLessonDestination { TeachingMode, Viewer, Create, Move, SeatingPlan, Planning }
 public sealed record TimetableDestinationOption(TimetableLessonDestination Kind, string Label);
 
 public class TodayLessonItem
 {
     public Guid GroupId { get; private init; }
+    public DateOnly Date { get; private init; }
     public int PeriodNumber { get; private init; }
     public string GroupName { get; private init; } = "";
     public string Room { get; private init; } = "";
@@ -960,23 +1007,24 @@ public class TodayLessonItem
     /// Direktsprung in den Verlaufsplan-Viewer (4.5.2) und den Unterrichtsmodus (14.x).
     public Lesson? Lesson { get; private init; }
     public bool HasLesson => Lesson is not null;
-    public string OpenButtonLabel => Lesson is not null ? "Verlaufsplan ansehen" : "Zur Lerngruppe";
+    public string PlanningStatusLabel => Lesson is null ? "Nicht geplant" : LessonStatusDisplay.ToName(Lesson.Status);
+    public string OpenButtonLabel => Lesson is not null ? "Verlaufsplan ansehen" : "Stunde anlegen";
 
-    public TodayLessonItem(Guid groupId, int periodNumber, string groupName, string room,
+    public TodayLessonItem(Guid groupId, DateOnly date, int periodNumber, string groupName, string room,
         string colorHex, string? lessonTopic, string? examTitle, bool hasUnhandledHomework = false,
         Lesson? lesson = null)
     {
-        GroupId = groupId; PeriodNumber = periodNumber; GroupName = groupName; Room = room;
+        GroupId = groupId; Date = date; PeriodNumber = periodNumber; GroupName = groupName; Room = room;
         ColorHex = colorHex; LessonTopic = lessonTopic; ExamTitle = examTitle;
         HasUnhandledHomework = hasUnhandledHomework; Lesson = lesson;
     }
 
     public static TodayLessonItem ForSubstitution(int periodNumber, SubstitutionEntry entry) => new(
-        entry.GroupId ?? Guid.Empty, periodNumber, entry.GroupLabel, "", "#8E24AA", entry.Description, null)
+        entry.GroupId ?? Guid.Empty, entry.Date, periodNumber, entry.GroupLabel, "", "#8E24AA", entry.Description, null)
     { IsSubstitution = true };
 
     public static TodayLessonItem ForCancelled(Guid groupId, int periodNumber, string groupName, SubstitutionEntry entry) => new(
-        groupId, periodNumber, groupName, "", "#757575",
+        groupId, entry.Date, periodNumber, groupName, "", "#757575",
         string.IsNullOrWhiteSpace(entry.Description) ? null : entry.Description, null)
     { IsCancelled = true };
 }

LehrerApp.Desktop/Views/Groups/MoveLessonDialog.axaml

@@ -4,7 +4,7 @@
         x:Class="LehrerApp.Desktop.Views.Groups.MoveLessonDialog"
         x:DataType="vm:MoveLessonDialogViewModel"
         Title="Stunde verschieben"
-        Width="400" Height="260" MinWidth="360" MinHeight="240"
+        Width="440" Height="430" MinWidth="400" MinHeight="400"
         CanResize="False" WindowStartupLocation="CenterOwner">
 
   <Grid RowDefinitions="*,Auto" Margin="24">
@@ -13,6 +13,8 @@
       <TextBlock FontSize="12" Opacity="0.6">
         <Run Text="Bisheriges Datum: "/>
         <Run Text="{Binding CurrentDateDisplay}"/>
+        <Run Text=" · "/>
+        <Run Text="{Binding CurrentPeriodDisplay}"/>
       </TextBlock>
 
       <StackPanel Spacing="4">
@@ -22,6 +24,24 @@
                    IsVisible="{Binding NewDateTextError, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
       </StackPanel>
 
+      <StackPanel Spacing="4">
+        <TextBlock Text="Neue Stunde" FontSize="12" Opacity="0.7"/>
+        <NumericUpDown Value="{Binding NewPeriod}" Minimum="1" Maximum="20"
+                       FormatString="0" PlaceholderText="Stundennummer"/>
+        <TextBlock Text="{Binding NewPeriodError}" Foreground="Red" FontSize="11"
+                   IsVisible="{Binding NewPeriodError, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
+      </StackPanel>
+
+      <Border Background="{DynamicResource SystemControlBackgroundAltHighBrush}" CornerRadius="6"
+              Padding="10" IsVisible="{Binding CanSplitDoubleLesson}">
+        <StackPanel Spacing="5">
+          <CheckBox Content="Nur den zweiten Teil der Doppelstunde verschieben"
+                    IsChecked="{Binding SplitDoubleLesson}"/>
+          <TextBlock Text="Der Verlauf wird an der Dauer der ersten Stunde geteilt. Der zweite Teil wird als eigene Fortsetzungsstunde angelegt."
+                     FontSize="11" Opacity="0.65" TextWrapping="Wrap"/>
+        </StackPanel>
+      </Border>
+
       <CheckBox Content="Folgestunden automatisch verschieben"
                 IsChecked="{Binding ShiftFollowingPlanned}"
                 ToolTip.Tip="Verschiebt alle noch geplanten Stunden derselben Einheit, die nach dieser Stunde liegen, um denselben Zeitraum. Bereits durchgeführte Stunden bleiben unverändert."/>

LehrerApp.Desktop/Views/Groups/PlanningTabView.axaml

@@ -91,7 +91,8 @@
                 ToolTip.Tip="Verlaufsplan schreibgeschützt und größer anzeigen — zum Mitnehmen in den Unterricht."/>
         <Button Content="Bearbeiten"             Command="{Binding EditLessonCommand}" IsEnabled="{Binding !IsReadOnly}"/>
         <Button Content="Verschieben"            Command="{Binding MoveLessonCommand}" IsEnabled="{Binding !IsReadOnly}"/>
-        <Button Content="Status → Durchgeführt"  Command="{Binding AdvanceLessonStatusCommand}" IsEnabled="{Binding !IsReadOnly}"/>
+        <Button Content="Status weiter" Command="{Binding AdvanceLessonStatusCommand}" IsEnabled="{Binding !IsReadOnly}"
+                ToolTip.Tip="Entwurf/Geplant → Bereit → Durchgeführt"/>
         <Button Content="Sitzung erzeugen"       Command="{Binding CreateParticipationSessionCommand}"
                 IsEnabled="{Binding !IsReadOnly}"
                 ToolTip.Tip="Legt eine Mitarbeitssitzung mit Datum und Thema dieser Stunde an."/>

LehrerApp.Desktop/Views/Groups/PlanningTabView.axaml.cs

@@ -42,6 +42,7 @@ public partial class PlanningTabView : UserControl
             vm.OnGenerateLessonSeries = ShowGenerateLessonSeriesDialog;
             vm.OnAiAssist = ShowAiAssistDialog;
             vm.OnNotify = Notifications.ShowSuccess;
+            vm.OnError = Notifications.ShowError;
         }
     }
 
@@ -126,7 +127,7 @@ public partial class PlanningTabView : UserControl
 
     private async Task<MoveLessonTarget?> ShowMoveLessonDialog(Lesson lesson)
     {
-        var dialogVm = new MoveLessonDialogViewModel(lesson.Date);
+        var dialogVm = new MoveLessonDialogViewModel(lesson.Date, lesson.LessonNumber);
         var dialog = new MoveLessonDialog { DataContext = dialogVm };
         var owner = TopLevel.GetTopLevel(this) as Window;
         if (owner is null) return null;

LehrerApp.Desktop/Views/Planning/TimetableUnitPickerDialog.axaml

@@ -0,0 +1,43 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="clr-namespace:LehrerApp.Desktop.ViewModels.Planning"
+        x:Class="LehrerApp.Desktop.Views.Planning.TimetableUnitPickerDialog"
+        x:DataType="vm:TimetableUnitPickerViewModel"
+        Title="Einheit für die Stunde wählen"
+        Width="470" Height="390" MinWidth="420" MinHeight="360"
+        CanResize="False" WindowStartupLocation="CenterOwner">
+  <Grid RowDefinitions="*,Auto" Margin="24">
+    <StackPanel Grid.Row="0" Spacing="16">
+      <TextBlock Text="Stunde anlegen" Classes="dialogtitle"/>
+      <TextBlock Text="{Binding ContextLabel}" FontSize="12" Opacity="0.65"/>
+      <TextBlock Text="Die Stunde braucht eine Unterrichtseinheit. Laufende Einheiten werden zuerst vorgeschlagen."
+                 FontSize="12" TextWrapping="Wrap" Opacity="0.75"/>
+
+      <StackPanel Spacing="5" IsVisible="{Binding HasUnits}">
+        <TextBlock Text="Vorhandene Einheit" FontSize="12" Opacity="0.7"/>
+        <ComboBox ItemsSource="{Binding Units}" SelectedItem="{Binding SelectedUnit}"
+                  HorizontalAlignment="Stretch">
+          <ComboBox.ItemTemplate>
+            <DataTemplate x:DataType="vm:TimetableUnitOption">
+              <StackPanel>
+                <TextBlock Text="{Binding Label}" FontWeight="SemiBold"/>
+                <TextBlock Text="{Binding Detail}" FontSize="11" Opacity="0.6"/>
+              </StackPanel>
+            </DataTemplate>
+          </ComboBox.ItemTemplate>
+        </ComboBox>
+      </StackPanel>
+
+      <StackPanel Spacing="5">
+        <TextBlock Text="Oder neue Einheit anlegen" FontSize="12" Opacity="0.7"/>
+        <TextBox Text="{Binding NewUnitTitle}" PlaceholderText="Titel der neuen Einheit"/>
+      </StackPanel>
+      <TextBlock Text="{Binding Error}" Foreground="Red" FontSize="11"
+                 IsVisible="{Binding Error, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
+    </StackPanel>
+    <Grid Grid.Row="1" ColumnDefinitions="*,8,*" Margin="0,20,0,0">
+      <Button Grid.Column="0" Content="Abbrechen" HorizontalAlignment="Stretch" Click="OnCancel"/>
+      <Button Grid.Column="2" Content="Weiter zur Planung" HorizontalAlignment="Stretch" Click="OnSave"/>
+    </Grid>
+  </Grid>
+</Window>

LehrerApp.Desktop/Views/Planning/TimetableUnitPickerDialog.axaml.cs

@@ -0,0 +1,19 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using LehrerApp.Desktop.ViewModels.Planning;
+
+namespace LehrerApp.Desktop.Views.Planning;
+
+public partial class TimetableUnitPickerDialog : Window
+{
+    public TimetableUnitPickerDialog() => InitializeComponent();
+
+    private void OnSave(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is not TimetableUnitPickerViewModel vm) return;
+        vm.SaveCommand.Execute(null);
+        if (vm.Result is not null) Close(true);
+    }
+
+    private void OnCancel(object? sender, RoutedEventArgs e) => Close(false);
+}

LehrerApp.Desktop/Views/Planning/TimetableView.axaml

@@ -120,6 +120,7 @@
                             </TextBlock>
                             <TextBlock Text="{Binding LessonTopic}" FontSize="11" Opacity="0.75"
                                        TextWrapping="Wrap" IsVisible="{Binding HasLessonTopic}"/>
+                            <TextBlock Text="{Binding PlanningStatusLabel}" FontSize="10" Opacity="0.62"/>
                             <TextBlock Text="{Binding ExamTitle}" FontSize="11" Foreground="#D85A30" FontWeight="SemiBold"
                                        IsVisible="{Binding HasExam}"/>
                             <TextBlock Text="📓 Hausaufgabe aus letzter Stunde noch nicht kontrolliert" FontSize="11"
@@ -258,6 +259,8 @@
                                                IsVisible="{Binding HasRoom}"/>
                                     <TextBlock Text="{Binding Topic}" FontSize="10" Foreground="White" Opacity="0.8"
                                                TextWrapping="Wrap" IsVisible="{Binding HasTopic}"/>
+                                    <TextBlock Text="{Binding PlanningStatusLabel}" FontSize="9" Foreground="White"
+                                               Opacity="0.78" Margin="0,1,0,0"/>
                                     <TextBlock Text="Ferien" FontSize="10" Foreground="White" FontWeight="SemiBold"
                                                Opacity="0.9" IsVisible="{Binding IsHoliday}" Margin="0,2,0,0"/>
                                     <TextBlock Text="Ausfall" FontSize="10" Foreground="White" FontWeight="SemiBold"
@@ -293,6 +296,12 @@
                                       <MenuItem Header="📋 Planungsviewer" IsVisible="{Binding HasLesson}"
                                                 Tag="{x:Static vm:TimetableLessonDestination.Viewer}"
                                                 Click="OnWeekCellMenuItemClick"/>
+                                      <MenuItem Header="＋ Stunde anlegen" IsVisible="{Binding HasNoLesson}"
+                                                Tag="{x:Static vm:TimetableLessonDestination.Create}"
+                                                Click="OnWeekCellMenuItemClick"/>
+                                      <MenuItem Header="↪ Stunde verschieben" IsVisible="{Binding HasLesson}"
+                                                Tag="{x:Static vm:TimetableLessonDestination.Move}"
+                                                Click="OnWeekCellMenuItemClick"/>
                                       <MenuItem Header="🪑 Sitzplan"
                                                 Tag="{x:Static vm:TimetableLessonDestination.SeatingPlan}"
                                                 Click="OnWeekCellMenuItemClick"/>

LehrerApp.Desktop/Views/Planning/TimetableView.axaml.cs

@@ -26,6 +26,8 @@ public partial class TimetableView : UserControl
             vm.OnImportWebUntisTimetable = ShowWebUntisTimetableDialog;
             vm.OnOpenLessonViewer = ShowLessonViewerDialog;
             vm.OnOpenTeachingMode = ShowTeachingMode;
+            vm.OnCreateLesson = ShowCreateLessonDialog;
+            vm.OnMoveLesson = ShowMoveLessonDialog;
         }
     }
 
@@ -33,10 +35,11 @@ public partial class TimetableView : UserControl
     /// Stelle gelöst, in der "Heute"-Tagesliste statt im Wochenraster): im Wochenraster oben
     /// führt ein Klick auf eine Stunden-Kachel bislang entweder in den Planungsviewer oder zur
     /// Einheitenplanung — je nachdem, ob schon eine Lesson existiert, ohne dass das von außen
-    /// erkennbar wäre. Popup-Menü (MenuFlyout, kein ComboBox mehr) mit allen vier Zielen als
+    /// erkennbar wäre. Popup-Menü (MenuFlyout, kein ComboBox mehr) mit allen Zielen einschließlich
+    /// Direktanlage und Verschieben als
     /// Alternative zum Direktklick, siehe <see cref="TimetableViewModel.OpenWeekCellCommand"/>
     /// für den "einheitlicheren" Standard-Klick (Unterrichtsansicht bei laufender Stunde, sonst
-    /// Planungsviewer, sonst Einheitenplanung). MenuItem.Click statt Command-Binding: ein
+    /// Planungsviewer, sonst Direktanlage). MenuItem.Click statt Command-Binding: ein
     /// $parent[ItemsControl]-Vorfahrenpfad (wie beim Zeilen-Button) funktioniert innerhalb eines
     /// Flyouts nicht zuverlässig, weil dessen Popup nicht im normalen visuellen Baum hängt (siehe
     /// TODO.md-Nachtrag zum Klassenlehrer-Bereich) — DataContext-Vererbung (kein Pfad-Suchen,
@@ -58,6 +61,14 @@ public partial class TimetableView : UserControl
                 if (cell.Lesson is { } viewLesson && vm.OnOpenLessonViewer is not null)
                     await vm.OnOpenLessonViewer(viewLesson);
                 break;
+            case TimetableLessonDestination.Create:
+                if (cell.Date is { } createDate && vm.OnCreateLesson is not null)
+                    await vm.OnCreateLesson(new TimetableLessonRequest(cell.GroupId, createDate, cell.PeriodNumber));
+                break;
+            case TimetableLessonDestination.Move:
+                if (cell.Lesson is { } moveLesson && vm.OnMoveLesson is not null)
+                    await vm.OnMoveLesson(new TimetableLessonMoveRequest(moveLesson, cell.PeriodNumber));
+                break;
             case TimetableLessonDestination.Planning:
                 if (cell.GroupId != Guid.Empty)
                     App.Services.GetRequiredService<MainWindowViewModel>().NavigateToGroupDetail(cell.GroupId, 6);
@@ -69,6 +80,96 @@ public partial class TimetableView : UserControl
         }
     }
 
+    private async Task ShowCreateLessonDialog(TimetableLessonRequest request)
+    {
+        var owner = TopLevel.GetTopLevel(this) as Window;
+        var groups = App.Services.GetRequiredService<IGroupRepository>();
+        var group = groups.GetById(request.GroupId);
+        if (owner is null || group is null || !group.IsActive) return;
+
+        var lessons = App.Services.GetRequiredService<ILessonRepository>();
+        if (lessons.GetByGroupAndDate(request.GroupId, request.Date)
+            .Any(l => l.LessonNumber == request.PeriodNumber))
+        {
+            App.Services.GetRequiredService<NotificationService>()
+                .ShowError("Für diesen Termin existiert bereits eine Stundenplanung.");
+            return;
+        }
+
+        var units = App.Services.GetRequiredService<IUnitRepository>();
+        var pickerVm = new TimetableUnitPickerViewModel(units, group.Id, group.Name,
+            request.Date, request.PeriodNumber);
+        var picker = new TimetableUnitPickerDialog { DataContext = pickerVm };
+        if (!await picker.ShowDialog<bool>(owner) || pickerVm.Result is not { } unit) return;
+
+        var groupLessons = units.GetByGroup(group.Id).SelectMany(u => lessons.GetByUnit(u.Id)).ToList();
+        var materials = groupLessons.SelectMany(l => l.Phases).Select(p => p.Material)
+            .Where(x => !string.IsNullOrWhiteSpace(x)).Distinct(StringComparer.OrdinalIgnoreCase)
+            .OrderBy(x => x, StringComparer.CurrentCultureIgnoreCase).ToList();
+        var shorthands = groupLessons.SelectMany(l => l.Phases).Select(p => p.Shorthand)
+            .Where(x => !string.IsNullOrWhiteSpace(x)).Distinct(StringComparer.OrdinalIgnoreCase)
+            .OrderBy(x => x, StringComparer.CurrentCultureIgnoreCase).ToList();
+        var subject = group.SubjectId is { } subjectId
+            ? App.Services.GetRequiredService<ISubjectRepository>().GetById(subjectId) : null;
+
+        var lessonVm = new LessonDialogViewModel(
+            lessons,
+            App.Services.GetRequiredService<IShorthandCodeRepository>(),
+            App.Services.GetRequiredService<IAlternativeLessonPathRepository>(),
+            App.Services.GetRequiredService<ITimetableSlotRepository>(),
+            App.Services.GetRequiredService<PeriodScheduleService>(),
+            App.Services.GetRequiredService<IAttachmentStorage>(),
+            unit.Id, group.Id, group.Name, subject?.Name ?? "", materials, shorthands,
+            editingLesson: null, suggestedDate: request.Date, suggestedPeriod: request.PeriodNumber);
+        var lessonDialog = new LessonDialog { DataContext = lessonVm };
+        if (await lessonDialog.ShowDialog<bool>(owner) && lessonVm.Result is not null)
+        {
+            if (pickerVm.ResultIsNew) units.Save(unit);
+            (DataContext as TimetableViewModel)?.Load();
+            App.Services.GetRequiredService<NotificationService>().ShowSuccess("Stunde angelegt.");
+        }
+    }
+
+    private async Task ShowMoveLessonDialog(TimetableLessonMoveRequest request)
+    {
+        var owner = TopLevel.GetTopLevel(this) as Window;
+        if (owner is null) return;
+        var lesson = request.Lesson;
+        var slots = App.Services.GetRequiredService<ITimetableSlotRepository>();
+        var schedule = App.Services.GetRequiredService<PeriodScheduleService>();
+        var anchor = lesson.LessonNumber;
+        var firstPartMinutes = anchor is int p ? schedule.GetDurationMinutes(p) : 0;
+        var isDouble = anchor is int start && firstPartMinutes > 0 &&
+            slots.GetByGroup(lesson.GroupId).Any(s => s.Weekday == lesson.Date.DayOfWeek &&
+                s.PeriodNumber == start + 1) && lesson.Phases.Sum(x => x.DurationMinutes) > firstPartMinutes;
+
+        var dialogVm = new MoveLessonDialogViewModel(lesson.Date, lesson.LessonNumber, isDouble,
+            isDouble && anchor is int a && request.SelectedPeriod > a);
+        var dialog = new MoveLessonDialog { DataContext = dialogVm };
+        if (!await dialog.ShowDialog<bool>(owner) || dialogVm.Result is not { } target) return;
+
+        try
+        {
+            var service = new LessonSchedulingService(App.Services.GetRequiredService<ILessonRepository>());
+            if (target.SplitDoubleLesson)
+            {
+                if (target.NewPeriod is not int newPeriod)
+                    throw new InvalidOperationException("Für den zweiten Teil ist eine Zielstunde erforderlich.");
+                service.SplitAndMoveSecondPart(lesson, firstPartMinutes, target.NewDate, newPeriod,
+                    schedule.GetTimes(newPeriod)?.Start);
+            }
+            else service.Move(lesson, target.NewDate, target.NewPeriod, target.ShiftFollowing);
+
+            (DataContext as TimetableViewModel)?.Load();
+            App.Services.GetRequiredService<NotificationService>().ShowSuccess(
+                target.SplitDoubleLesson ? "Doppelstunde getrennt und Fortsetzung verschoben." : "Stunde verschoben.");
+        }
+        catch (InvalidOperationException ex)
+        {
+            App.Services.GetRequiredService<NotificationService>().ShowError(ex.Message);
+        }
+    }
+
     private async Task ShowWebUntisTimetableDialog()
     {
         var owner = TopLevel.GetTopLevel(this) as Window;