feat: Fehlzeiten Calender

LehrerApp.Desktop/ViewModels/ClassTeacher/ClassTeacherOverviewViewModel.cs

@@ -18,6 +18,10 @@ public enum ClassTeacherStatusKind { Ok, Info, Warning, Danger }
 /// Schlagwort gezielt dämpfen kann, siehe <see cref="ClassTeacherRosterRow.MatchDomains"/>.</summary>
 public enum VorgangScoreDomain { Attendance, Lateness, Classbook }
 
+/// <summary>Auswahlbereich des kompakten Monatskalenders. Ein leerer Schülername steht für die
+/// bisherige Klassen-Gesamtansicht.</summary>
+public sealed record ClassTeacherCalendarScope(string? StudentName, string DisplayName);
+
 public sealed record ClassTeacherRosterRow(string StudentName, int? ExternKey, bool HasAbsenceToday,
     string? AbsenceTooltip, bool HasRecentClassRegisterEntry)
 {
@@ -424,6 +428,7 @@ public partial class ClassTeacherOverviewViewModel : ObservableObject
     public ObservableCollection<ClassTeacherPatternNotice> PatternNotices { get; } = [];
     public ObservableCollection<ClassTeacherOpenExcuseRow> OpenExcuses { get; } = [];
     public ObservableCollection<ClassTeacherCompactCalendarDay> CompactMonthDays { get; } = [];
+    public ObservableCollection<ClassTeacherCalendarScope> CalendarScopes { get; } = [];
 
     [ObservableProperty] private string? _homeroomClassName;
     [ObservableProperty] private int _activeTabIndex;
@@ -453,6 +458,7 @@ public partial class ClassTeacherOverviewViewModel : ObservableObject
     /// den "Klassenbuch öffnen"-Button gehängt statt in einer eigenen Kennzahlkarte.
     [ObservableProperty] private int _ownDocumentationFollowUpCount;
     [ObservableProperty] private int _ownDocumentationCriticalCount;
+    [ObservableProperty] private ClassTeacherCalendarScope? _selectedCalendarScope;
 
     // Zuletzt per Load() geholte WebUntis-Rohdaten, für RefreshFromLocalDataOnly() - damit ein
     // eingehendes Sync-Ereignis die Ansicht neu aufbauen kann, ohne selbst WebUntis anzufragen.
@@ -501,8 +507,17 @@ public partial class ClassTeacherOverviewViewModel : ObservableObject
     public double UnexcusedAbsenceFraction => StudentCount == 0 ? 0 : (double)UnexcusedAbsenceCount / StudentCount;
     public string DayOverviewTooltip => $"{PresentCount} anwesend · {LateCount} verspätet · " +
         $"{ExcusedAbsenceCount} entschuldigt · {UnexcusedAbsenceCount} unentschuldigt";
-    public string CompactMonthLabel => DateOnly.FromDateTime(DateTime.Today).ToString("MMMM yyyy",
-        System.Globalization.CultureInfo.GetCultureInfo("de-DE"));
+    public string CompactMonthLabel
+    {
+        get
+        {
+            var month = DateOnly.FromDateTime(DateTime.Today).ToString("MMMM yyyy",
+                System.Globalization.CultureInfo.GetCultureInfo("de-DE"));
+            return SelectedCalendarScope?.StudentName is { Length: > 0 }
+                ? $"{month} · {SelectedCalendarScope.DisplayName}"
+                : $"{month} · gesamte Klasse";
+        }
+    }
 
     public Func<Task>? OnNavigateToSettings { get; set; }
     public Func<Task>? OnNavigateToWorkload { get; set; }
@@ -534,6 +549,11 @@ public partial class ClassTeacherOverviewViewModel : ObservableObject
     partial void OnOpenExcuseOverflowCountChanged(int value) => OnPropertyChanged(nameof(HasOpenExcuseOverflow));
     partial void OnOwnDocumentationFollowUpCountChanged(int value) => OnPropertyChanged(nameof(HasOwnDocumentationAlerts));
     partial void OnOwnDocumentationCriticalCountChanged(int value) => OnPropertyChanged(nameof(HasOwnDocumentationAlerts));
+    partial void OnSelectedCalendarScopeChanged(ClassTeacherCalendarScope? value)
+    {
+        OnPropertyChanged(nameof(CompactMonthLabel));
+        if (CalendarScopes.Count > 0) RebuildCompactMonthFromCachedData();
+    }
     partial void OnSearchTextChanged(string value) => ApplyRosterFilter();
     partial void OnSelectedRosterFilterChanged(int value)
     {
@@ -548,7 +568,8 @@ public partial class ClassTeacherOverviewViewModel : ObservableObject
     {
         ActiveTabIndex = 0;
         Roster.Clear(); PrimaryRoster.Clear(); SecondaryRoster.Clear(); TrendDays.Clear(); PatternNotices.Clear();
-        OpenExcuses.Clear(); CompactMonthDays.Clear(); OpenExcuseOverflowCount = 0;
+        OpenExcuses.Clear(); CompactMonthDays.Clear(); CalendarScopes.Clear(); SelectedCalendarScope = null;
+        OpenExcuseOverflowCount = 0;
     }
 
     // Wird beim Navigieren auf diese Seite aufgerufen statt LoadCommand: baut nur den lokalen
@@ -678,6 +699,12 @@ public partial class ClassTeacherOverviewViewModel : ObservableObject
                      holidayWeekdaysExcluded, termStart, classRegisterEvents,
                      _patternScoreSettings.Load(), closedVorgaengeByNameKey)) Roster.Add(row);
 
+        CalendarScopes.Add(new ClassTeacherCalendarScope(null, "Gesamte Klasse"));
+        foreach (var student in students.OrderBy(s => s.DisplayName))
+            CalendarScopes.Add(new ClassTeacherCalendarScope(student.DisplayName,
+                ClassTeacherOverviewViewModel.DisplayStudentName(student.DisplayName)));
+        SelectedCalendarScope = CalendarScopes[0];
+
         StudentCount = Roster.Count;
         TodayAlertCount = Roster.Count(r => r.HasAbsenceToday);
         TodayUnexcusedCount = Roster.Count(r => r.IsUnexcused);
@@ -724,7 +751,7 @@ public partial class ClassTeacherOverviewViewModel : ObservableObject
     private void OpenMonthlyCalendar()
     {
         var today = DateOnly.FromDateTime(DateTime.Today);
-        DetailsTab.StudentFilter = "";
+        DetailsTab.StudentFilter = SelectedCalendarScope?.StudentName ?? "";
         DetailsTab.CalendarMonth = new DateOnly(today.Year, today.Month, 1);
         ActiveTabIndex = 2;
         DetailsTab.ShowCalendarCommand.Execute(null);
@@ -735,15 +762,29 @@ public partial class ClassTeacherOverviewViewModel : ObservableObject
     {
         CompactMonthDays.Clear();
         foreach (var day in BuildCompactMonthDays(new DateOnly(today.Year, today.Month, 1),
-                     absences, registerEntries, today))
+                     absences, registerEntries, today, SelectedCalendarScope?.StudentName))
             CompactMonthDays.Add(day);
     }
 
+    private void RebuildCompactMonthFromCachedData()
+    {
+        if (_lastAbsences is null || _lastClassRegisterEvents is null) return;
+        var today = DateOnly.FromDateTime(DateTime.Today);
+        BuildCompactMonth(ClassAbsenceDaySummaryRow.GroupByStudentAndDay(_lastAbsences),
+            _lastClassRegisterEvents, today);
+    }
+
     public static IReadOnlyList<ClassTeacherCompactCalendarDay> BuildCompactMonthDays(DateOnly month,
         IReadOnlyList<ClassAbsenceDaySummaryRow> absences,
-        IReadOnlyList<UntisForeignClassRegisterEventDto> registerEntries, DateOnly today)
+        IReadOnlyList<UntisForeignClassRegisterEventDto> registerEntries, DateOnly today,
+        string? studentName = null)
     {
         var first = new DateOnly(month.Year, month.Month, 1);
+        if (!string.IsNullOrWhiteSpace(studentName))
+        {
+            absences = absences.Where(a => UntisNameMatching.NamesMatch(a.StudentName, studentName)).ToList();
+            registerEntries = registerEntries.Where(e => UntisNameMatching.NamesMatch(e.StudentName, studentName)).ToList();
+        }
         var registerRows = registerEntries
             .Select(e => (Entry: e, Valid: TryDate(e.Date, out var date), Date: date))
             .Where(x => x.Valid && x.Date.Year == first.Year && x.Date.Month == first.Month)
@@ -768,6 +809,12 @@ public partial class ClassTeacherOverviewViewModel : ObservableObject
         return result;
     }
 
+    internal static string DisplayStudentName(string value)
+    {
+        var parts = value.Split(' ', StringSplitOptions.RemoveEmptyEntries);
+        return parts.Length < 2 ? value : string.Join(" ", parts.Skip(1).Append(parts[0]));
+    }
+
     private static int SignalPriority(ClassTeacherCalendarEventKind kind) => kind switch
     {
         ClassTeacherCalendarEventKind.Unexcused => 0,