Initial

2026-03-29 23:47:31 +02:00
commit 216d5d2280
75 changed files with 5702 additions and 0 deletions
--- a/LehrerApp.Sync/ReadableSnapshotService.cs
+++ b/LehrerApp.Sync/ReadableSnapshotService.cs
@@ -0,0 +1,155 @@
+using System.Net.Http.Json;
+using LehrerApp.Core.Interfaces;
+using LehrerApp.Core.Models;
+using LehrerApp.Core.Services;
+
+namespace LehrerApp.Sync;
+
+/// <summary>
+/// Exportiert einen lesbaren Snapshot der lokalen LiteDB
+/// und pusht ihn zur API – wo er für die WebApp abrufbar ist.
+///
+/// Wird automatisch nach jedem Sync-Zyklus ausgeführt
+/// und kann manuell angestoßen werden.
+/// </summary>
+public class ReadableSnapshotService
+{
+    private readonly HttpClient _http;
+    private readonly IStudentRepository _students;
+    private readonly IGroupRepository _groups;
+    private readonly IEnrollmentRepository _enrollments;
+    private readonly IExamRepository _exams;
+    private readonly IExamResultRepository _examResults;
+    private readonly IGradeRepository _grades;
+    private readonly IUnitRepository _units;
+    private readonly ILessonRepository _lessons;
+    private readonly IWorkTaskRepository _tasks;
+    private readonly SchoolYearService _schoolYear;
+    private readonly string _deviceId;
+
+    public event Action<string>? StatusChanged;
+
+    public ReadableSnapshotService(
+        HttpClient http,
+        IStudentRepository students,
+        IGroupRepository groups,
+        IEnrollmentRepository enrollments,
+        IExamRepository exams,
+        IExamResultRepository examResults,
+        IGradeRepository grades,
+        IUnitRepository units,
+        ILessonRepository lessons,
+        IWorkTaskRepository tasks,
+        SchoolYearService schoolYear,
+        string deviceId)
+    {
+        _http = http;
+        _students = students;
+        _groups = groups;
+        _enrollments = enrollments;
+        _exams = exams;
+        _examResults = examResults;
+        _grades = grades;
+        _units = units;
+        _lessons = lessons;
+        _tasks = tasks;
+        _schoolYear = schoolYear;
+        _deviceId = deviceId;
+    }
+
+    // ── Export ────────────────────────────────────────────────────────────────
+
+    public async Task<bool> ExportAndPushAsync(
+        CancellationToken ct = default)
+    {
+        StatusChanged?.Invoke("Snapshot wird erstellt…");
+
+        try
+        {
+            var snapshot = BuildSnapshot();
+
+            StatusChanged?.Invoke("Snapshot wird übertragen…");
+            var response = await _http.PostAsJsonAsync(
+                "/api/snapshot/readable", snapshot, ct);
+
+            if (!response.IsSuccessStatusCode)
+            {
+                StatusChanged?.Invoke(
+                    $"Übertragung fehlgeschlagen: {response.StatusCode}");
+                return false;
+            }
+
+            StatusChanged?.Invoke(
+                $"Snapshot übertragen – {snapshot.Meta.StudentCount} Schüler, " +
+                $"{snapshot.Meta.GroupCount} Gruppen");
+            return true;
+        }
+        catch (Exception ex)
+        {
+            StatusChanged?.Invoke($"Fehler: {ex.Message}");
+            return false;
+        }
+    }
+
+    // ── Snapshot aufbauen ─────────────────────────────────────────────────────
+
+    private ReadableSnapshot BuildSnapshot()
+    {
+        var schoolYear = _schoolYear.CurrentSchoolYear();
+        var groups = _groups.GetBySchoolYear(schoolYear);
+        var groupIds = groups.Select(g => g.Id).ToHashSet();
+
+        var students = _students.GetAll();
+        var enrollments = groups
+            .SelectMany(g => _enrollments.GetByGroupAndYear(g.Id, schoolYear))
+            .ToList();
+
+        var exams = groupIds
+            .SelectMany(gid => _exams.GetByGroup(gid))
+            .ToList();
+
+        var examResults = exams
+            .SelectMany(e => _examResults.GetByExam(e.Id))
+            .ToList();
+
+        var grades = groupIds
+            .SelectMany(gid => _grades.GetByGroup(gid))
+            .ToList();
+
+        var units = groupIds
+            .SelectMany(gid => _units.GetByGroup(gid))
+            .ToList();
+
+        var lessons = units
+            .SelectMany(u => _lessons.GetByUnit(u.Id))
+            .ToList();
+
+        var tasks = _tasks.GetAll()
+            .Where(t => t.Status != WorkTaskStatus.Done)
+            .ToList();
+
+        var snapshot = new ReadableSnapshot
+        {
+            SchoolYear   = schoolYear,
+            Students     = students,
+            Groups       = groups,
+            Enrollments  = enrollments,
+            Exams        = exams,
+            ExamResults  = examResults,
+            Grades       = grades,
+            Units        = units,
+            Lessons      = lessons,
+            Tasks        = tasks,
+            Meta = new SnapshotMeta
+            {
+                StudentCount      = students.Count,
+                GroupCount        = groups.Count,
+                ExamCount         = exams.Count,
+                ExportedByDevice  = _deviceId,
+                OldestData        = DateTime.UtcNow.AddYears(-1), // vereinfacht
+            },
+        };
+
+        return snapshot;
+    }
+}