Initial

LehrerApp.Desktop/ViewModels/Groups/GroupViewModels.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using LehrerApp.Core.Interfaces;
+using LehrerApp.Core.Models;
+using LehrerApp.Core.Services;
+using System.Collections.ObjectModel;
+
+namespace LehrerApp.Desktop.ViewModels.Groups;
+
+// ── Gruppenliste ──────────────────────────────────────────────────────────────
+
+public partial class GroupListViewModel : ObservableObject
+{
+    private readonly IGroupRepository _groups;
+    private readonly SchoolYearService _schoolYearService;
+
+    [ObservableProperty] private string _selectedSchoolYear = "";
+    [ObservableProperty] private string _searchText = "";
+    [ObservableProperty] private GroupListItem? _selectedGroup;
+
+    public ObservableCollection<string> SchoolYears { get; } = [];
+    public ObservableCollection<GroupListItem> Groups { get; } = [];
+
+    public GroupListViewModel(
+        IGroupRepository groups,
+        SchoolYearService schoolYearService)
+    {
+        _groups = groups;
+        _schoolYearService = schoolYearService;
+
+        foreach (var y in schoolYearService.RecentSchoolYears())
+            SchoolYears.Add(y);
+
+        SelectedSchoolYear = schoolYearService.CurrentSchoolYear();
+        LoadGroups();
+    }
+
+    partial void OnSelectedSchoolYearChanged(string value) => LoadGroups();
+    partial void OnSearchTextChanged(string value) => LoadGroups();
+
+    private void LoadGroups()
+    {
+        Groups.Clear();
+        var all = _groups.GetBySchoolYear(SelectedSchoolYear);
+
+        var filtered = string.IsNullOrWhiteSpace(SearchText)
+            ? all
+            : all.Where(g =>
+                g.Name.Contains(SearchText, StringComparison.OrdinalIgnoreCase) ||
+                (g.Subject?.Contains(SearchText, StringComparison.OrdinalIgnoreCase) ?? false));
+
+        foreach (var g in filtered)
+            Groups.Add(new GroupListItem(g));
+    }
+
+    [RelayCommand]
+    private void AddGroup()
+    {
+        // TODO: Dialog öffnen
+    }
+
+    [RelayCommand]
+    private void Refresh() => LoadGroups();
+}
+
+public class GroupListItem
+{
+    public Guid Id { get; }
+    public string Name { get; }
+    public string Subject { get; }
+    public string SchoolYear { get; }
+    public int GradeLevel { get; }
+    public string TypeLabel { get; }
+    public string GradingLabel { get; }
+
+    public GroupListItem(LearningGroup g)
+    {
+        Id = g.Id;
+        Name = g.Name;
+        Subject = g.Subject ?? "";
+        SchoolYear = g.SchoolYear;
+        GradeLevel = g.GradeLevel;
+        TypeLabel = g.Type == GroupType.Class ? "Klasse" : "Kurs";
+        GradingLabel = g.GradingSystem == GradingSystem.Grades1To6
+            ? "Noten 1–6"
+            : "Punkte 0–15";
+    }
+}
+
+// ── Gruppendetail (Tab-Navigation) ────────────────────────────────────────────
+
+public partial class GroupDetailViewModel : ObservableObject
+{
+    private readonly IGroupRepository _groups;
+    private readonly IStudentRepository _students;
+    private readonly IEnrollmentRepository _enrollments;
+    private readonly IExamRepository _exams;
+    private readonly SchoolYearService _schoolYearService;
+
+    [ObservableProperty] private LearningGroup? _group;
+    [ObservableProperty] private string _groupTitle = "";
+    [ObservableProperty] private int _studentCount;
+    [ObservableProperty] private GroupTab _activeTab = GroupTab.Overview;
+
+    // Sub-ViewModels für Tabs – lazy geladen
+    public ObservableCollection<StudentSummary> Students { get; } = [];
+    public ObservableCollection<ExamSummary> Exams { get; } = [];
+
+    public GroupDetailViewModel(
+        IGroupRepository groups,
+        IStudentRepository students,
+        IEnrollmentRepository enrollments,
+        IExamRepository exams,
+        SchoolYearService schoolYearService)
+    {
+        _groups = groups;
+        _students = students;
+        _enrollments = enrollments;
+        _exams = exams;
+        _schoolYearService = schoolYearService;
+    }
+
+    public void LoadGroup(Guid groupId)
+    {
+        Group = _groups.GetById(groupId);
+        if (Group is null) return;
+
+        GroupTitle = $"{Group.Name} · {Group.SchoolYear}";
+        LoadStudents();
+        LoadExams();
+    }
+
+    [RelayCommand]
+    private void SwitchTab(GroupTab tab)
+    {
+        ActiveTab = tab;
+    }
+
+    private void LoadStudents()
+    {
+        if (Group is null) return;
+        Students.Clear();
+
+        var enrolled = _students.GetByGroup(Group.Id, Group.SchoolYear);
+        StudentCount = enrolled.Count;
+
+        foreach (var s in enrolled)
+            Students.Add(new StudentSummary(s));
+    }
+
+    private void LoadExams()
+    {
+        if (Group is null) return;
+        Exams.Clear();
+
+        foreach (var e in _exams.GetByGroup(Group.Id))
+            Exams.Add(new ExamSummary(e));
+    }
+
+    [RelayCommand]
+    private void AddStudent()
+    {
+        // TODO: Schüler-Auswahl-Dialog
+    }
+
+    [RelayCommand]
+    private void AddExam()
+    {
+        // TODO: Klausur-Erstellen-Dialog
+    }
+}
+
+public enum GroupTab { Overview, Students, Exams, Grades, Planner, Documentation }
+
+public class StudentSummary
+{
+    public Guid Id { get; }
+    public string FullName { get; }
+
+    public StudentSummary(Core.Models.Student s)
+    {
+        Id = s.Id;
+        FullName = s.FullName;
+    }
+}
+
+public class ExamSummary
+{
+    public Guid Id { get; }
+    public string Title { get; }
+    public string Date { get; }
+    public string Status { get; }
+
+    public ExamSummary(Core.Models.Exam e)
+    {
+        Id = e.Id;
+        Title = e.Title;
+        Date = e.Date.ToString("dd.MM.yyyy");
+        Status = e.Status switch
+        {
+            ExamStatus.Planned   => "Geplant",
+            ExamStatus.Conducted => "Durchgeführt",
+            ExamStatus.Graded    => "Korrigiert",
+            ExamStatus.Returned  => "Zurückgegeben",
+            _ => "",
+        };
+    }
+}