UI Improvements: Planungsdialog, Fehlzeitendarstellung, Vorauswahl der Einheit

LehrerApp.Desktop/ViewModels/ClassTeacher/ClassTeacherDetailsViewModel.cs

@@ -119,6 +119,24 @@ public sealed record ClassAbsenceDaySummaryRow(DateOnly Date, string StudentName
         DateOnly.TryParseExact(value.ToString(), "yyyyMMdd", out date);
 }
 
+public enum ClassTeacherCalendarEventKind { Late, Absent, Unexcused, Excused, ClassRegister, Homework }
+
+/// <summary>Kompakter, farblich codierter Marker in der Klassenlehrer-Monatsansicht.</summary>
+public sealed record ClassTeacherCalendarEvent(string StudentName, string Code, string Label,
+    string ColorHex, ClassTeacherCalendarEventKind Kind)
+{
+    public string Tooltip => $"{StudentName}: {Label}";
+}
+
+/// <summary>Ein Werktag im 5-Spalten-Monatsraster; Tage außerhalb des Monats sind Platzhalter.</summary>
+public sealed record ClassTeacherCalendarDay(DateOnly? Date, IReadOnlyList<ClassTeacherCalendarEvent> Events)
+{
+    public bool IsPlaceholder => Date is null;
+    public string DayLabel => Date?.ToString("dd.") ?? "";
+    public string WeekdayLabel => Date?.ToString("ddd", System.Globalization.CultureInfo.GetCultureInfo("de-DE")) ?? "";
+    public bool HasEvents => Events.Count > 0;
+}
+
 /// <summary>
 /// Details-Ansicht des Klassenlehrer-Bereichs: Klassenbucheinträge, die andere Lehrkräfte zu
 /// Schülern der Klasse angelegt haben (WebUntis "-alle-"-Bericht, gefiltert auf fremde statt der
@@ -149,6 +167,7 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
     public ObservableCollection<ClassAbsenceDaySummaryRow> AbsenceEntries { get; } = [];
     public ObservableCollection<ClassTeacherCategoryAggregateRow> CategoryAggregates { get; } = [];
     public ObservableCollection<DocumentationItem> OwnDocumentationEntries { get; } = [];
+    public ObservableCollection<ClassTeacherCalendarDay> CalendarDays { get; } = [];
 
     /// Für das Kontextmenü "→ An Vorgang anheften" (DataGrid.SelectedItem, zweigleisig gebunden).
     [ObservableProperty] private ClassTeacherClassRegisterRow? _selectedEntry;
@@ -160,6 +179,9 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
     /// Von der Übersicht gesetzt (Klick auf eine Roster-Zeile) - leer zeigt alle Schüler*innen.
     [ObservableProperty] private string _studentFilter = "";
     [ObservableProperty] private int _quickRangeIndex = 1;
+    [ObservableProperty] private bool _showMonthlyCalendar;
+    [ObservableProperty] private bool _includeHomeworkInCalendar;
+    [ObservableProperty] private DateOnly _calendarMonth = new(DateTime.Today.Year, DateTime.Today.Month, 1);
     /// Umschalter Klassenbuch (WebUntis, andere Lehrkräfte) ↔ eigene Dokumentation.
     [ObservableProperty] private bool _showOwnDocumentation;
     [ObservableProperty] private int _ownDocumentationCount;
@@ -174,6 +196,7 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
 
     public bool HasEntries => Entries.Count > 0;
     public bool HasAbsenceEntries => AbsenceEntries.Count > 0;
+    public bool ShowAbsenceListEmpty => !ShowMonthlyCalendar && !HasAbsenceEntries;
     public bool HasCategoryAggregates => CategoryAggregates.Count > 0;
     public bool HasOwnDocumentationEntries => OwnDocumentationEntries.Count > 0;
     /// Die Kategorien-Chipreihe fasst nur WebUntis-Kategorien zusammen (<see cref="CategoryAggregates"/>)
@@ -182,6 +205,8 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
     public int UntisCriticalCount => Entries.Count(e => e.IsDangerStatus);
     public string ActiveFilterLabel => string.IsNullOrWhiteSpace(StudentFilter)
         ? "Alle Schüler*innen" : StudentFilter;
+    public string CalendarMonthLabel => CalendarMonth.ToString("MMMM yyyy",
+        System.Globalization.CultureInfo.GetCultureInfo("de-DE"));
 
     public ClassTeacherDetailsViewModel(UntisReportCacheService cache, IDocumentationRepository documentation,
         IStudentRepository students, ClassTeacherCasesViewModel cases)
@@ -198,6 +223,7 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
         StudentFilter = "";
         Entries.Clear();
         AbsenceEntries.Clear();
+        CalendarDays.Clear();
         CategoryAggregates.Clear();
         OwnDocumentationEntries.Clear();
         _rosterMatches = [];
@@ -208,6 +234,9 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
     partial void OnStudentFilterChanged(string value) => OnPropertyChanged(nameof(ActiveFilterLabel));
 
     partial void OnShowOwnDocumentationChanged(bool value) => OnPropertyChanged(nameof(ShowCategoryAggregates));
+    partial void OnShowMonthlyCalendarChanged(bool value) => OnPropertyChanged(nameof(ShowAbsenceListEmpty));
+    partial void OnIncludeHomeworkInCalendarChanged(bool value) => BuildCalendar();
+    partial void OnCalendarMonthChanged(DateOnly value) => OnPropertyChanged(nameof(CalendarMonthLabel));
 
     partial void OnQuickRangeIndexChanged(int value)
     {
@@ -230,6 +259,37 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
     [RelayCommand]
     private Task ApplyFilter() => LoadInternal(forceRefresh: false);
 
+    [RelayCommand] private void ShowAbsenceList() => ShowMonthlyCalendar = false;
+
+    [RelayCommand]
+    private async Task ShowCalendar()
+    {
+        ShowMonthlyCalendar = true;
+        await LoadCalendarMonth(forceRefresh: false);
+    }
+
+    [RelayCommand]
+    private async Task PreviousCalendarMonth()
+    {
+        CalendarMonth = CalendarMonth.AddMonths(-1);
+        await LoadCalendarMonth(forceRefresh: false);
+    }
+
+    [RelayCommand]
+    private async Task NextCalendarMonth()
+    {
+        CalendarMonth = CalendarMonth.AddMonths(1);
+        await LoadCalendarMonth(forceRefresh: false);
+    }
+
+    private Task LoadCalendarMonth(bool forceRefresh)
+    {
+        StartDate = new DateTimeOffset(CalendarMonth.ToDateTime(TimeOnly.MinValue));
+        var end = CalendarMonth.AddMonths(1).AddDays(-1);
+        EndDate = new DateTimeOffset(end.ToDateTime(TimeOnly.MinValue));
+        return LoadInternal(forceRefresh);
+    }
+
     [RelayCommand]
     private async Task ClearStudentFilter()
     {
@@ -270,6 +330,8 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
             foreach (var row in ClassAbsenceDaySummaryRow.GroupByStudentAndDay(absences))
                 AbsenceEntries.Add(row);
 
+            BuildCalendar();
+
             var localStudents = _students.GetAll();
             _rosterMatches = rosterTask.Result
                 .Select(r => (Roster: r, Student: ClassTeacherOverviewViewModel.MatchStudent(r.DisplayName, localStudents)))
@@ -289,6 +351,67 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
         finally { Busy = false; NotifyListState(); }
     }
 
+    private void BuildCalendar()
+    {
+        CalendarDays.Clear();
+        foreach (var day in BuildCalendarDays(CalendarMonth, AbsenceEntries, Entries, IncludeHomeworkInCalendar))
+            CalendarDays.Add(day);
+    }
+
+    /// <summary>Baut ein Montag-bis-Freitag-Raster aus den ohnehin geladenen Berichten. Negative
+    /// Klassenbucheinträge erscheinen als !; Hausaufgaben sind eine bewusst optionale Sonderlage.</summary>
+    public static IReadOnlyList<ClassTeacherCalendarDay> BuildCalendarDays(DateOnly month,
+        IReadOnlyList<ClassAbsenceDaySummaryRow> absences,
+        IReadOnlyList<ClassTeacherClassRegisterRow> registerEntries, bool includeHomework)
+    {
+        var first = new DateOnly(month.Year, month.Month, 1);
+        var last = first.AddMonths(1).AddDays(-1);
+        var gridStart = first.AddDays(-(((int)first.DayOfWeek + 6) % 7));
+        var gridEnd = last.AddDays((7 - (int)last.DayOfWeek) % 7);
+        var result = new List<ClassTeacherCalendarDay>();
+
+        for (var date = gridStart; date <= gridEnd; date = date.AddDays(1))
+        {
+            if (date.DayOfWeek is DayOfWeek.Saturday or DayOfWeek.Sunday) continue;
+            if (date.Month != first.Month)
+            {
+                result.Add(new ClassTeacherCalendarDay(null, []));
+                continue;
+            }
+
+            var events = new List<ClassTeacherCalendarEvent>();
+            foreach (var absence in absences.Where(a => a.Date == date).OrderBy(a => a.StudentDisplayName))
+            {
+                var (code, label, color, kind) = absence.IsUnexcused
+                    ? ("U", "Unentschuldigt gefehlt", "#C62828", ClassTeacherCalendarEventKind.Unexcused)
+                    : absence.IsLate
+                        ? ("V", "Verspätet", "#EF6C00", ClassTeacherCalendarEventKind.Late)
+                        : absence.FriendlyStatusLabel.Contains("Entschuldigt", StringComparison.OrdinalIgnoreCase)
+                            ? ("E", "Entschuldigt gefehlt", "#2E7D32", ClassTeacherCalendarEventKind.Excused)
+                            : ("A", "Abwesend", "#1565C0", ClassTeacherCalendarEventKind.Absent);
+                events.Add(new ClassTeacherCalendarEvent(absence.StudentDisplayName, code, label, color, kind));
+            }
+
+            foreach (var entry in registerEntries.Where(e => e.Date == date).OrderBy(e => e.StudentDisplayName))
+            {
+                var isHomework = ContainsHomework(entry);
+                if (isHomework && !includeHomework) continue;
+                if (!entry.IsDangerStatus && !isHomework) continue;
+                events.Add(new ClassTeacherCalendarEvent(entry.StudentDisplayName,
+                    isHomework ? "H" : "!", isHomework ? "Hausaufgaben" : "Negativer Klassenbucheintrag",
+                    isHomework ? "#6A1B9A" : "#8E24AA",
+                    isHomework ? ClassTeacherCalendarEventKind.Homework : ClassTeacherCalendarEventKind.ClassRegister));
+            }
+
+            result.Add(new ClassTeacherCalendarDay(date, events));
+        }
+        return result;
+    }
+
+    private static bool ContainsHomework(ClassTeacherClassRegisterRow entry) =>
+        entry.CategoryName?.Contains("Hausauf", StringComparison.OrdinalIgnoreCase) == true ||
+        entry.Text?.Contains("Hausauf", StringComparison.OrdinalIgnoreCase) == true;
+
     /// Baut <see cref="OwnDocumentationEntries"/> aus <see cref="_rosterMatches"/> und dem zuletzt
     /// geladenen Zeitraum neu auf — separat von <see cref="LoadInternal"/>, damit Anlegen/Bearbeiten/
     /// Löschen eines eigenen Eintrags nicht auch die WebUntis-Berichte neu abruft. Die eigentliche
@@ -419,6 +542,7 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
     {
         OnPropertyChanged(nameof(HasEntries));
         OnPropertyChanged(nameof(HasAbsenceEntries));
+        OnPropertyChanged(nameof(ShowAbsenceListEmpty));
         OnPropertyChanged(nameof(HasCategoryAggregates));
         OnPropertyChanged(nameof(ShowCategoryAggregates));
         OnPropertyChanged(nameof(HasOwnDocumentationEntries));

LehrerApp.Desktop/ViewModels/Groups/PlanningViewModels.cs

@@ -102,10 +102,10 @@ public partial class PlanningTabViewModel : ObservableObject
         GradeLevel = group?.GradeLevel ?? 0;
         SubjectName = SubjectId is Guid sid ? _subjects.GetById(sid)?.Name ?? "" : "";
         GroupLabel = group?.Name ?? "";
-        LoadUnits();
+        LoadUnits(preferActive: true);
     }
 
-    private void LoadUnits()
+    private void LoadUnits(bool preferActive = false)
     {
         var selectedId = SelectedUnit?.Id;
         Units.Clear();
@@ -128,7 +128,11 @@ public partial class PlanningTabViewModel : ObservableObject
         KnownMaterials  = materials.OrderBy(m => m, StringComparer.CurrentCultureIgnoreCase).ToList();
         KnownShorthands = shorthands.OrderBy(s => s, StringComparer.CurrentCultureIgnoreCase).ToList();
 
-        SelectedUnit = Units.FirstOrDefault(u => u.Id == selectedId) ?? Units.FirstOrDefault();
+        // Beim ersten Öffnen bzw. beim Wechsel aus dem Stundenplan steht die laufende Einheit im
+        // Fokus. Eine bewusste Auswahl innerhalb derselben Gruppe bleibt bei Refreshes erhalten.
+        SelectedUnit = !preferActive && selectedId is not null
+            ? Units.FirstOrDefault(u => u.Id == selectedId) ?? Units.FirstOrDefault(u => u.Status == UnitStatus.Active) ?? Units.FirstOrDefault()
+            : Units.FirstOrDefault(u => u.Status == UnitStatus.Active) ?? Units.FirstOrDefault();
     }
 
     partial void OnSelectedUnitChanged(UnitSummary? value)
@@ -574,6 +578,7 @@ public partial class UnitDialogViewModel : ObservableObject
     [ObservableProperty] private string _startDateText = "";
     [ObservableProperty] private string _endDateText = "";
     [ObservableProperty] private string _statusName = UnitStatusDisplay.Options[0];
+    [ObservableProperty] private string _statusNotice = "";
     [ObservableProperty] private string _notes = "";
     [ObservableProperty] private bool _isCompetencyPanelOpen;
     [ObservableProperty] private string _titleError = "";
@@ -594,6 +599,20 @@ public partial class UnitDialogViewModel : ObservableObject
     public string DialogTitle => _editingUnit is null ? "Neue Einheit anlegen" : "Einheit bearbeiten";
     public string SaveButtonText => _editingUnit is null ? "Anlegen" : "Speichern";
 
+    partial void OnStatusNameChanged(string value)
+    {
+        if (UnitStatusDisplay.FromName(value) != UnitStatus.Active)
+        {
+            StatusNotice = "";
+            return;
+        }
+
+        var previous = _units.GetByGroup(_groupId)
+            .FirstOrDefault(u => u.Status == UnitStatus.Active && u.Id != _editingUnit?.Id);
+        StatusNotice = previous is null ? ""
+            : $"„{previous.Title}“ wird beim Speichern automatisch abgeschlossen.";
+    }
+
     public UnitDialogViewModel(IUnitRepository units, ICompetencyDomainRepository competencyDomains,
         Guid groupId, Guid? subjectId, int gradeLevel, string groupName, string subjectName, Unit? editingUnit)
     {
@@ -679,6 +698,17 @@ public partial class UnitDialogViewModel : ObservableObject
         Result.Status = UnitStatusDisplay.FromName(StatusName);
         Result.Notes = string.IsNullOrWhiteSpace(Notes) ? null : Notes.Trim();
         Result.Competencies = _competencyCodes;
+        if (Result.Status == UnitStatus.Active)
+        {
+            // Pro Lerngruppe gibt es genau einen aktuellen Arbeitskontext. Frühere laufende
+            // Einheiten werden nicht verworfen, sondern fachlich sauber abgeschlossen.
+            foreach (var previous in _units.GetByGroup(_groupId)
+                         .Where(u => u.Status == UnitStatus.Active && u.Id != Result.Id))
+            {
+                previous.Status = UnitStatus.Completed;
+                _units.Save(previous);
+            }
+        }
         _units.Save(Result);
     }
 }