Fix: Sync Log und verwaise Einträge

LehrerApp.Desktop/ViewModels/ClassTeacher/ClassTeacherDetailsViewModel.cs

@@ -199,6 +199,7 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
     public bool ShowAbsenceListEmpty => !ShowMonthlyCalendar && !HasAbsenceEntries;
     public bool HasCategoryAggregates => CategoryAggregates.Count > 0;
     public bool HasOwnDocumentationEntries => OwnDocumentationEntries.Count > 0;
+    public bool CanAddOwnDocumentation => !Busy && _rosterMatches.Count > 0;
     /// Die Kategorien-Chipreihe fasst nur WebUntis-Kategorien zusammen (<see cref="CategoryAggregates"/>)
     /// — im Modus "Eigene Dokumentation" ausgeblendet, dort gibt es kein Äquivalent zu CategoryGroup.
     public bool ShowCategoryAggregates => HasCategoryAggregates && !ShowOwnDocumentation;
@@ -431,7 +432,7 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
             _loadedStart, _loadedEnd, StudentFilter);
         foreach (var d in entries)
         {
-            var name = _rosterMatches.First(m => m.StudentId == d.StudentId).DisplayName;
+            var name = DocumentationStudentDisplay(d, _rosterMatches);
             OwnDocumentationEntries.Add(new DocumentationItem(d, name));
         }
         OwnDocumentationCount = OwnDocumentationEntries.Count;
@@ -452,7 +453,9 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
     {
         var matchedIds = rosterMatches.Select(m => m.StudentId).ToHashSet();
         return all
-            .Where(d => !d.IsDeleted && matchedIds.Contains(d.StudentId) && d.Date >= start && d.Date <= end)
+            .Where(d => !d.IsDeleted &&
+                        (matchedIds.Contains(d.StudentId) || IsUnassignedClassDocumentation(d)) &&
+                        d.Date >= start && d.Date <= end)
             .Where(d => MatchesOwnDocStudentFilter(d, rosterMatches, studentFilter))
             .OrderByDescending(d => d.IsDraft).ThenByDescending(d => d.Date)
             .ToList();
@@ -462,14 +465,37 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
         IReadOnlyList<(Guid StudentId, string DisplayName)> rosterMatches, string studentFilter)
     {
         if (string.IsNullOrWhiteSpace(studentFilter)) return true;
+        if (IsUnassignedClassDocumentation(d))
+            return d.Participants.Any(p => NameContainsSearchTerm(p, studentFilter));
         var name = rosterMatches.FirstOrDefault(m => m.StudentId == d.StudentId).DisplayName;
-        return name is not null && UntisNameMatching.NamesMatch(name, studentFilter);
+        return name is not null && NameContainsSearchTerm(name, studentFilter);
+    }
+
+    private static bool IsUnassignedClassDocumentation(Documentation d) =>
+        d.StudentId == Guid.Empty && d.GroupId is null;
+
+    private static bool NameContainsSearchTerm(string name, string search)
+    {
+        if (UntisNameMatching.NamesMatch(name, search)) return true;
+        var searchKey = UntisNameMatching.NameKey(search);
+        return searchKey.Length > 0 && UntisNameMatching.NameKey(name).Split(' ').Contains(searchKey);
+    }
+
+    private static string DocumentationStudentDisplay(Documentation d,
+        IReadOnlyList<(Guid StudentId, string DisplayName)> rosterMatches)
+    {
+        if (d.StudentId != Guid.Empty)
+            return rosterMatches.FirstOrDefault(m => m.StudentId == d.StudentId).DisplayName
+                   ?? "Unbekannter Schülerbezug";
+        return d.Participants.Count > 0
+            ? $"Ohne festen Bezug · {string.Join(", ", d.Participants)}"
+            : "Ohne Schülerbezug";
     }
 
     [RelayCommand]
     private async Task AddOwnDocumentation()
     {
-        if (OnEditOwnDocumentation is null) return;
+        if (OnEditOwnDocumentation is null || !CanAddOwnDocumentation) return;
         var options = _rosterMatches.Select(m => new StudentOption(m.StudentId, m.DisplayName)).ToList();
         var result = await OnEditOwnDocumentation(options, null);
         if (result is null) return;
@@ -553,6 +579,7 @@ public partial class ClassTeacherDetailsViewModel : ObservableObject
         OnPropertyChanged(nameof(HasCategoryAggregates));
         OnPropertyChanged(nameof(ShowCategoryAggregates));
         OnPropertyChanged(nameof(HasOwnDocumentationEntries));
+        OnPropertyChanged(nameof(CanAddOwnDocumentation));
         OnPropertyChanged(nameof(UntisCriticalCount));
     }
 }