feat: expand teaching mode with live timeline and seating quick checks

LehrerApp.Desktop/ViewModels/Groups/GroupOverviewViewModel.cs

@@ -44,6 +44,15 @@ public partial class GroupOverviewViewModel : ObservableObject
     private readonly GradingService _grading;
     private readonly SchoolYearService _schoolYear;
 
+    public ObservableCollection<Lesson> TodayLessons { get; } = [];
+    [ObservableProperty] private Lesson? _selectedTeachingLesson;
+    public bool HasTodayLessons => TodayLessons.Count > 0;
+    public Action<Lesson>? OnOpenTeachingMode { get; set; }
+    [RelayCommand] private void StartTeachingMode()
+    {
+        if (SelectedTeachingLesson is { } lesson) OnOpenTeachingMode?.Invoke(lesson);
+    }
+
     private Guid _groupId;
     private string _groupName = "";
 
@@ -130,6 +139,16 @@ public partial class GroupOverviewViewModel : ObservableObject
     public void Refresh()
     {
         var today = DateOnly.FromDateTime(DateTime.Today);
+        TodayLessons.Clear();
+        if (_groups.GetById(_groupId)?.IsActive == true)
+            foreach (var lesson in _lessons.GetByGroupAndRange(_groupId, today, today)
+                         .Where(l => l.Status != LessonStatus.Cancelled)
+                         .OrderBy(l => l.StartTime).ThenBy(l => l.LessonNumber))
+                TodayLessons.Add(lesson);
+        var now = TimeOnly.FromDateTime(DateTime.Now);
+        SelectedTeachingLesson = TodayLessons.LastOrDefault(l => l.StartTime <= now)
+            ?? TodayLessons.FirstOrDefault();
+        OnPropertyChanged(nameof(HasTodayLessons));
         LoadNextLesson(today);
         LoadNextExam(today);
         LoadYearComparison();

LehrerApp.Desktop/ViewModels/Groups/SeatingPlanViewModels.cs

@@ -16,6 +16,45 @@ public partial class SeatingPlanTabViewModel : ObservableObject
     private readonly IParticipationRepository _participation;
     private readonly IParticipationAspectRepository _aspects;
     private readonly IDocumentationRepository? _documentation;
+    [ObservableProperty] private bool _isTeachingMode;
+    [ObservableProperty] private string _quickMode = "";
+    public bool IsQuickMode => QuickMode.Length > 0;
+    public string QuickModeDisplay => QuickMode switch
+    {
+        "Attendance" => "Anwesenheit kontrollieren · Fehlend = Entschuldigung offen",
+        "Homework" => "Hausaufgaben kontrollieren",
+        _ => "Klicken: bewerten"
+    };
+    [RelayCommand] private void CheckAttendance() => QuickMode = "Attendance";
+    [RelayCommand] private void CheckHomework() => QuickMode = "Homework";
+    [RelayCommand] private void EndQuickCheck() => QuickMode = "";
+    partial void OnQuickModeChanged(string value)
+    {
+        if (value.Length > 0) IsEditMode = false;
+        foreach (var seat in Seats) seat.QuickMode = value;
+        OnPropertyChanged(nameof(IsQuickMode));
+        OnPropertyChanged(nameof(QuickModeDisplay));
+    }
+
+    private void SaveQuickStatus(SeatCellViewModel seat, bool positive)
+    {
+        if (!IsEditable || !IsQuickMode || seat.SelectedOption.StudentId is not Guid studentId) return;
+        var session = EnsureTodaySession();
+        if (session is null) return;
+        // Always merge with the latest entry, so quick checks preserve ratings and counters.
+        var entry = _participation.GetBySessionAndStudent(session.Id, studentId)
+            ?? new ParticipationEntry { SessionId = session.Id, StudentId = studentId };
+        if (QuickMode == "Attendance") entry.Attendance = positive ? AttendanceStatus.Present : AttendanceStatus.ExcusePending;
+        else
+        {
+            entry.Homework = positive ? HomeworkStatus.Completed : HomeworkStatus.MissingOpen;
+            entry.HomeworkMissing = HomeworkDisplay.CountsAsMissing(entry.Homework);
+        }
+        _participation.Save(entry);
+        RefreshSeatLessonData();
+        OnAssessmentChanged?.Invoke();
+    }
+
     private Guid _groupId;
     private SeatingPlan? _currentPlan;
     private bool _isReadOnly;
@@ -235,7 +274,12 @@ public partial class SeatingPlanTabViewModel : ObservableObject
                       ?? StudentSeatOption.Empty;
                 var isHidden = hiddenSeats.Any(h => h.Row == row && h.Column == column);
                 Seats.Add(new SeatCellViewModel(row, column, StudentOptions, option, OnSeatChanged,
-                    CanEditLayout, ToggleSituationTag, IsEditable, isHidden, ToggleSeatHidden, TallyParticipation));
+                    CanEditLayout, ToggleSituationTag, IsEditable, isHidden, ToggleSeatHidden, TallyParticipation)
+                {
+                    QuickMode = QuickMode,
+                    OnQuickStatus = SaveQuickStatus,
+                    OnQuickSpecial = AssessStudent
+                });
             }
             UpdateAssignmentSummary();
             RefreshSeatLessonData();
@@ -488,6 +532,7 @@ public partial class SeatingPlanTabViewModel : ObservableObject
 
     partial void OnIsEditModeChanged(bool value)
     {
+        if (value) QuickMode = "";
         OnPropertyChanged(nameof(CanEditLayout));
         foreach (var seat in Seats)
         {
@@ -540,6 +585,32 @@ public sealed class ParticipationSessionOption(ParticipationSession session)
 
 public partial class SeatCellViewModel : ObservableObject
 {
+    [ObservableProperty] private string _quickMode = "";
+    public bool ShowQuickCheck => QuickMode.Length > 0 && IsOccupied && CanRecordLesson;
+    public bool ShowNormalActions => ShowLessonOverview && QuickMode.Length == 0;
+    public bool ShowSituationActions => ShowNormalActions && CanRecordLesson;
+    public string QuickPositiveLabel => QuickMode == "Attendance" ? "Anwesend" : "Gemacht";
+    public string QuickNegativeLabel => QuickMode == "Attendance" ? "Fehlend" : "Fehlt";
+    public Action<SeatCellViewModel, bool>? OnQuickStatus { get; init; }
+    public Func<SeatCellViewModel, Task>? OnQuickSpecial { get; init; }
+    [RelayCommand] private void QuickPositive() => OnQuickStatus?.Invoke(this, true);
+    [RelayCommand] private void QuickNegative() => OnQuickStatus?.Invoke(this, false);
+    [RelayCommand] private Task QuickSpecial() => OnQuickSpecial?.Invoke(this) ?? Task.CompletedTask;
+    partial void OnQuickModeChanged(string value)
+    {
+        OnPropertyChanged(nameof(ShowQuickCheck));
+        OnPropertyChanged(nameof(ShowNormalActions));
+        OnPropertyChanged(nameof(ShowSituationActions));
+        OnPropertyChanged(nameof(QuickPositiveLabel));
+        OnPropertyChanged(nameof(QuickNegativeLabel));
+        OnPropertyChanged(nameof(DisplayOpacity));
+    }
+    partial void OnCanRecordLessonChanged(bool value)
+    {
+        OnPropertyChanged(nameof(ShowQuickCheck));
+        OnPropertyChanged(nameof(ShowSituationActions));
+    }
+
     private readonly Action<SeatCellViewModel> _onChanged;
     private bool _suppressChange;
     private readonly Action<SeatCellViewModel, string> _toggleSituationTag;
@@ -581,7 +652,7 @@ public partial class SeatCellViewModel : ObservableObject
     /// Opacity ist im DataTemplate bereits lokal an LessonOpacity gebunden gewesen; ein lokal
     /// gebundener Wert überschreibt aber jeden Style-Setter für dieselbe Eigenschaft, daher muss
     /// die Abblendung für ausgeblendete Plätze hier statt per CSS-Klasse erfolgen.</summary>
-    public double DisplayOpacity => IsHidden ? 0.4 : LessonOpacity;
+    public double DisplayOpacity => IsHidden ? 0.4 : ShowQuickCheck ? 1 : LessonOpacity;
 
     private readonly Action<SeatCellViewModel, bool> _tally;
 
@@ -615,6 +686,9 @@ public partial class SeatCellViewModel : ObservableObject
 
     partial void OnSelectedOptionChanged(StudentSeatOption value)
     {
+        OnPropertyChanged(nameof(ShowQuickCheck));
+        OnPropertyChanged(nameof(ShowNormalActions));
+        OnPropertyChanged(nameof(ShowSituationActions));
         OnPropertyChanged(nameof(IsOccupied));
         OnPropertyChanged(nameof(StudentName));
         OnPropertyChanged(nameof(ShowLessonOverview));
@@ -624,6 +698,8 @@ public partial class SeatCellViewModel : ObservableObject
 
     partial void OnCanEditChanged(bool value)
     {
+        OnPropertyChanged(nameof(ShowNormalActions));
+        OnPropertyChanged(nameof(ShowSituationActions));
         OnPropertyChanged(nameof(ShowLessonOverview));
         OnPropertyChanged(nameof(ShowSeat));
         OnPropertyChanged(nameof(CanToggleHidden));

LehrerApp.Desktop/ViewModels/Groups/TeachingModeViewModel.cs

@@ -20,6 +20,7 @@ namespace LehrerApp.Desktop.ViewModels.Groups;
 /// </summary>
 public class TeachingModeViewModel
 {
+    public TeachingTimelineViewModel Timeline { get; }
     public string GroupName { get; }
     public LessonViewerViewModel LessonInfo { get; }
     public SeatingPlanTabViewModel SeatingPlan { get; }
@@ -38,9 +39,11 @@ public class TeachingModeViewModel
         SeatingPlanTabViewModel seatingPlan, ParticipationTabViewModel participation)
     {
         GroupName = group.Name;
+        Timeline = new TeachingTimelineViewModel(lesson, lessons, !group.IsActive);
         LessonInfo = new LessonViewerViewModel(lesson, alternativePaths);
 
         SeatingPlan = seatingPlan;
+        SeatingPlan.IsTeachingMode = true;
         SeatingPlan.Initialize(group.Id, !group.IsActive);
         SeatingPlan.SelectOrCreateSessionForLesson(lesson);
 
@@ -102,14 +105,19 @@ public partial class TeachingModeHomeworkViewModel : ObservableObject
         if (_previousLesson is null) return;
         _previousLesson.HomeworkChecked = value;
         if (value) _previousLesson.HomeworkCheckDismissed = false;
-        _lessons.Save(_previousLesson);
+        var latest = _lessons.GetById(_previousLesson.Id) ?? _previousLesson;
+        latest.HomeworkChecked = value;
+        if (value) latest.HomeworkCheckDismissed = false;
+        _lessons.Save(latest);
     }
 
     [RelayCommand]
     private void SaveCurrentHomework()
     {
         _lesson.Homework = CurrentHomework;
-        _lessons.Save(_lesson);
+        var latest = _lessons.GetById(_lesson.Id) ?? _lesson;
+        latest.Homework = CurrentHomework;
+        _lessons.Save(latest);
         SaveStatus = "Gespeichert.";
     }
 }

LehrerApp.Desktop/ViewModels/Groups/TeachingTimelineViewModel.cs

@@ -0,0 +1,224 @@
+using System.Collections.ObjectModel;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using LehrerApp.Core.Interfaces;
+using LehrerApp.Core.Models;
+
+namespace LehrerApp.Desktop.ViewModels.Groups;
+
+public partial class TeachingTimelineViewModel : ObservableObject
+{
+    private readonly Lesson _lesson;
+    private readonly ILessonRepository _lessons;
+    private readonly Func<DateTime> _utcNow;
+    private TeachingTimelineState? _state;
+    public bool IsEditable { get; }
+    public ObservableCollection<TeachingPhaseViewModel> Phases { get; } = [];
+    public ObservableCollection<Lesson> TransferTargets { get; } = [];
+    [ObservableProperty] private Lesson? _transferTarget;
+    [ObservableProperty] private string _status = "";
+    [ObservableProperty] private bool _needsStart;
+    public bool HasPhases => Phases.Count > 0;
+    public bool HasTransferTargets => TransferTargets.Count > 0;
+    public bool HasRemainder => Phases.Any(p => p.IsOverflow && !p.IsCompleted && !p.IsTransferred);
+
+    public TeachingTimelineViewModel(Lesson lesson, ILessonRepository lessons, bool readOnly = false,
+        Func<DateTime>? utcNow = null)
+    {
+        _lesson = lesson;
+        _lessons = lessons;
+        _utcNow = utcNow ?? (() => DateTime.UtcNow);
+        IsEditable = !readOnly;
+        _state = lesson.TeachingTimeline;
+        if (_state is not null)
+        {
+            // LiteDB returns local DateTimes by default; arithmetic below uses UTC.
+            _state.StartUtc = _state.StartUtc.ToUniversalTime();
+            _state.EndUtc = _state.EndUtc.ToUniversalTime();
+            _state.HeldSinceUtc = _state.HeldSinceUtc?.ToUniversalTime();
+        }
+        foreach (var phase in lesson.Phases.Where(p => p.AlternativePathId is null))
+            Phases.Add(new TeachingPhaseViewModel(phase, this));
+        if (_state is null && lesson.StartTime is { } start)
+            CreateState(lesson.Date.ToDateTime(start).ToUniversalTime());
+        foreach (var target in lessons.GetByGroupAndRange(lesson.GroupId, lesson.Date, lesson.Date.AddDays(120))
+                     .Where(l => l.Id != lesson.Id && l.Status is not (LessonStatus.Cancelled or LessonStatus.Conducted)
+                         && (l.Date > lesson.Date || l.StartTime > lesson.StartTime || l.LessonNumber > lesson.LessonNumber))
+                     .OrderBy(l => l.Date).ThenBy(l => l.StartTime).ThenBy(l => l.LessonNumber))
+            TransferTargets.Add(target);
+        TransferTarget = TransferTargets.FirstOrDefault();
+        Refresh();
+    }
+
+    private void CreateState(DateTime start)
+    {
+        _state = new TeachingTimelineState
+        {
+            StartUtc = start,
+            EndUtc = start.AddMinutes(Phases.Sum(p => Math.Max(0, p.Source.DurationMinutes))),
+            Phases = Phases.Select(p => new TeachingPhaseTiming
+                { PhaseId = p.Source.Id, Minutes = Math.Max(0, p.Source.DurationMinutes) }).ToList()
+        };
+    }
+
+    [RelayCommand] private void StartNow()
+    {
+        if (!IsEditable || _state is not null) return;
+        CreateState(_utcNow());
+        Save();
+        Refresh();
+    }
+
+    public void Refresh()
+    {
+        NeedsStart = _state is null && HasPhases;
+        if (_state is null) return;
+        var now = _utcNow();
+        var cursor = _state.StartUtc;
+        _state.Phases.RemoveAll(t => !Phases.Any(p => p.Source.Id == t.PhaseId));
+        var ordered = _state.Phases.Select(t => Phases.FirstOrDefault(p => p.Source.Id == t.PhaseId))
+            .OfType<TeachingPhaseViewModel>().ToList();
+        // Keep surviving IDs in their live order when a plan was edited between openings.
+        foreach (var phase in Phases.Where(p => !ordered.Contains(p)).ToList())
+        {
+            _state.Phases.Add(new TeachingPhaseTiming { PhaseId = phase.Source.Id, Minutes = Math.Max(0, phase.Source.DurationMinutes) });
+            ordered.Add(phase);
+        }
+        for (var i = 0; i < ordered.Count; i++)
+            if (Phases.IndexOf(ordered[i]) != i) Phases.Move(Phases.IndexOf(ordered[i]), i);
+        foreach (var phase in Phases)
+        {
+            var timing = _state.Phases.First(t => t.PhaseId == phase.Source.Id);
+            var held = _state.HeldPhaseId == phase.Source.Id && _state.HeldSinceUtc.HasValue;
+            var extension = held ? Math.Max(0, (now - _state.HeldSinceUtc!.Value).TotalMinutes) : 0;
+            var end = cursor.AddMinutes(timing.Minutes + extension);
+            // Phases pushed entirely out of the lesson remain pending, even after closing
+            // the window overnight. They run only if explicitly brought forward.
+            var canRun = cursor < _state.EndUtc || timing.ExplicitlyStarted || held;
+            phase.StartUtc = cursor;
+            phase.EndUtc = end;
+            phase.IsActive = canRun && cursor <= now && (now < end || held)
+                && (now < _state.EndUtc || timing.ExplicitlyStarted || held);
+            phase.IsCompleted = canRun && !held && end <= now
+                && (end <= _state.EndUtc || timing.ExplicitlyStarted);
+            phase.IsOverflow = end > _state.EndUtc && !phase.IsCompleted;
+            phase.IsTransferred = _state.TransferredPhaseIds.Contains(phase.Source.Id);
+            phase.IsHeld = held;
+            var effectiveNow = timing.ExplicitlyStarted || held || now < _state.EndUtc ? now : _state.EndUtc;
+            var elapsed = Math.Clamp((effectiveNow - cursor).TotalMinutes, 0, timing.Minutes + extension);
+            phase.RemainingMinutes = phase.IsCompleted ? 0 : timing.Minutes + extension - elapsed;
+            phase.Progress = !canRun ? 0 : phase.IsCompleted ? 100 : elapsed / Math.Max(0.01, timing.Minutes + extension) * 100;
+            phase.TimeDisplay = $"{cursor.ToLocalTime():HH:mm}–{end.ToLocalTime():HH:mm}";
+            phase.CanStartNow = IsEditable && !phase.IsCompleted && !phase.IsActive && !phase.IsTransferred;
+            cursor = end;
+        }
+        OnPropertyChanged(nameof(HasRemainder));
+    }
+
+    public void Extend(TeachingPhaseViewModel phase, int minutes)
+    {
+        Refresh();
+        if (!IsEditable || !phase.IsActive || _state is null) return;
+        var timing = _state.Phases.First(p => p.PhaseId == phase.Source.Id);
+        timing.Minutes += minutes;
+        timing.ExplicitlyStarted = true;
+        Save(); Refresh();
+    }
+
+    public void Hold(TeachingPhaseViewModel phase)
+    {
+        Refresh();
+        if (!IsEditable || !phase.IsActive || phase.IsHeld || _state is null) return;
+        _state.HeldPhaseId = phase.Source.Id;
+        _state.HeldSinceUtc = _utcNow();
+        _state.Phases.First(p => p.PhaseId == phase.Source.Id).ExplicitlyStarted = true;
+        Save(); Refresh();
+    }
+
+    public void Finish(TeachingPhaseViewModel phase, bool advanceNext = true)
+    {
+        Refresh();
+        if (!IsEditable || !phase.IsActive || _state is null) return;
+        _state.Phases.First(p => p.PhaseId == phase.Source.Id).Minutes = Math.Max(0, (_utcNow() - phase.StartUtc).TotalMinutes);
+        _state.HeldPhaseId = null;
+        _state.HeldSinceUtc = null;
+        if (advanceNext)
+        {
+            var nextIndex = _state.Phases.FindIndex(p => p.PhaseId == phase.Source.Id) + 1;
+            if (nextIndex < _state.Phases.Count) _state.Phases[nextIndex].ExplicitlyStarted = true;
+        }
+        Save(); Refresh();
+    }
+
+    public void BringForward(TeachingPhaseViewModel phase)
+    {
+        Refresh();
+        if (!phase.CanStartNow || _state is null) return;
+        var active = Phases.FirstOrDefault(p => p.IsActive);
+        if (active is not null) Finish(active, advanceNext: false);
+        var timing = _state.Phases.First(p => p.PhaseId == phase.Source.Id);
+        timing.Minutes = phase.RemainingMinutes;
+        _state.Phases.Remove(timing);
+        var completed = Phases.TakeWhile(p => p.IsCompleted).Count();
+        _state.Phases.Insert(Math.Min(completed, _state.Phases.Count), timing);
+        timing.ExplicitlyStarted = true;
+        var now = _utcNow();
+        // A pending phase may be selected long after the scheduled end. Anchor it to
+        // now instead of letting yesterday's timestamps immediately complete it.
+        var prefix = _state.Phases.Take(completed).Sum(p => p.Minutes);
+        var delay = (now - _state.StartUtc.AddMinutes(prefix)).TotalMinutes;
+        if (completed == 0) _state.StartUtc = now;
+        else if (delay > 0) _state.Phases[completed - 1].Minutes += delay;
+        Save(); Refresh();
+    }
+
+    [RelayCommand] private void TransferRemainder()
+    {
+        Refresh();
+        if (!IsEditable || _state is null || TransferTarget is null) return;
+        var target = _lessons.GetById(TransferTarget.Id);
+        if (target is null || target.Status is LessonStatus.Cancelled or LessonStatus.Conducted) return;
+        var remainder = Phases.Where(p => p.IsOverflow && !p.IsCompleted && !p.IsTransferred).ToList();
+        if (remainder.Count == 0) return;
+        foreach (var phase in remainder)
+        {
+            var source = phase.Source;
+            target.Phases.Add(new LessonPhaseStep { Name = source.Name, DurationMinutes = (int)Math.Ceiling(phase.RemainingMinutes),
+                Activity = source.Activity, Material = source.Material, Shorthand = source.Shorthand });
+        }
+        _lessons.Save(target);
+        _state.TransferredPhaseIds.AddRange(remainder.Select(p => p.Source.Id));
+        Save(); Refresh();
+        Status = $"{remainder.Count} Phase(n) nach {target.Date:dd.MM.yyyy} · {target.Topic} kopiert.";
+    }
+
+    private void Save()
+    {
+        var latest = _lessons.GetById(_lesson.Id) ?? _lesson;
+        latest.TeachingTimeline = _state;
+        _lesson.TeachingTimeline = _state;
+        _lessons.Save(latest);
+    }
+}
+
+public partial class TeachingPhaseViewModel(LessonPhaseStep source, TeachingTimelineViewModel owner) : ObservableObject
+{
+    public LessonPhaseStep Source { get; } = source;
+    public DateTime StartUtc { get; set; }
+    public DateTime EndUtc { get; set; }
+    public double RemainingMinutes { get; set; }
+    [ObservableProperty] private bool _isActive;
+    [ObservableProperty] private bool _isCompleted;
+    [ObservableProperty] private bool _isOverflow;
+    [ObservableProperty] private bool _isHeld;
+    [ObservableProperty] private bool _isTransferred;
+    [ObservableProperty] private bool _canStartNow;
+    [ObservableProperty] private double _progress;
+    [ObservableProperty] private string _timeDisplay = "";
+    public bool IsEditable => owner.IsEditable;
+    [RelayCommand] private void ExtendFive() => owner.Extend(this, 5);
+    [RelayCommand] private void ExtendTen() => owner.Extend(this, 10);
+    [RelayCommand] private void Hold() => owner.Hold(this);
+    [RelayCommand] private void Finish() => owner.Finish(this);
+    [RelayCommand] private void BringForward() => owner.BringForward(this);
+}