implemented absence report module with form validation, prefill support, and API integration

lib/api/demo/data/demo_absence.dart

@@ -0,0 +1,17 @@
+import '../../marianumconnect/queries/absence/absence_prefill_response.dart';
+
+/// Demo fixtures for the absence-report form: the class dropdown and the
+/// identity/phone prefill. Typed (compile-checked) so a field rename can't
+/// silently drift the demo shape away from what the queries parse.
+class DemoAbsence {
+  const DemoAbsence._();
+
+  static List<String> classes() => const ['5a', '6b', '7c', '9d', '10a', 'Q1'];
+
+  static AbsencePrefillResponse prefill() => AbsencePrefillResponse(
+    firstName: 'Max',
+    lastName: 'Mustermann',
+    className: '10a',
+    phone: '0123 456789',
+  );
+}

lib/api/demo/demo_marianumconnect.dart

@@ -1,3 +1,4 @@
+import 'data/demo_absence.dart';
 import 'data/demo_breaker.dart';
 import 'data/demo_holidays.dart';
 import 'data/demo_timetable.dart';
@@ -39,6 +40,10 @@ class DemoMarianumConnect {
             .toList();
       case 'breaker':
         return DemoBreaker.none().toJson();
+      case 'absence/classes':
+        return DemoAbsence.classes();
+      case 'absence/prefill':
+        return DemoAbsence.prefill().toJson();
       case 'timetable/elements/teachers':
       case 'timetable/elements/students':
       case 'timetable/elements/classes':

lib/api/marianumconnect/queries/absence/absence_classes.dart

@@ -0,0 +1,13 @@
+import '../../marianumconnect_query.dart';
+
+/// GETs the selectable classes for the absence form (`absence/classes`). The
+/// body is a bare JSON string array, so [getList] (which maps objects) does not
+/// fit — read the raw list and cast.
+class AbsenceClasses extends MarianumConnectQuery {
+  AbsenceClasses({super.dio});
+
+  Future<List<String>> run() => guard(() async {
+    final response = await dio.get<List<dynamic>>(endpoint('absence/classes'));
+    return response.data!.cast<String>();
+  });
+}

lib/api/marianumconnect/queries/absence/absence_prefill.dart

@@ -0,0 +1,10 @@
+import '../../marianumconnect_query.dart';
+import 'absence_prefill_response.dart';
+
+/// GETs the absence-report form prefill (`absence/prefill`, bearer-auth).
+class AbsencePrefill extends MarianumConnectQuery {
+  AbsencePrefill({super.dio});
+
+  Future<AbsencePrefillResponse> run() =>
+      getObject('absence/prefill', AbsencePrefillResponse.fromJson);
+}

lib/api/marianumconnect/queries/absence/absence_prefill_response.dart

@@ -0,0 +1,28 @@
+import 'package:json_annotation/json_annotation.dart';
+
+part 'absence_prefill_response.g.dart';
+
+/// Prefill for the absence-report form: identity from LDAP plus the phone
+/// number from the user's last report (empty strings when unknown).
+@JsonSerializable()
+class AbsencePrefillResponse {
+  @JsonKey(defaultValue: '')
+  final String firstName;
+  @JsonKey(defaultValue: '')
+  final String lastName;
+  @JsonKey(defaultValue: '')
+  final String className;
+  @JsonKey(defaultValue: '')
+  final String phone;
+
+  AbsencePrefillResponse({
+    required this.firstName,
+    required this.lastName,
+    required this.className,
+    required this.phone,
+  });
+
+  factory AbsencePrefillResponse.fromJson(Map<String, dynamic> json) =>
+      _$AbsencePrefillResponseFromJson(json);
+  Map<String, dynamic> toJson() => _$AbsencePrefillResponseToJson(this);
+}

lib/api/marianumconnect/queries/absence/absence_prefill_response.g.dart

@@ -0,0 +1,25 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'absence_prefill_response.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+AbsencePrefillResponse _$AbsencePrefillResponseFromJson(
+  Map<String, dynamic> json,
+) => AbsencePrefillResponse(
+  firstName: json['firstName'] as String? ?? '',
+  lastName: json['lastName'] as String? ?? '',
+  className: json['className'] as String? ?? '',
+  phone: json['phone'] as String? ?? '',
+);
+
+Map<String, dynamic> _$AbsencePrefillResponseToJson(
+  AbsencePrefillResponse instance,
+) => <String, dynamic>{
+  'firstName': instance.firstName,
+  'lastName': instance.lastName,
+  'className': instance.className,
+  'phone': instance.phone,
+};

lib/api/marianumconnect/queries/absence/absence_submit.dart

@@ -0,0 +1,32 @@
+import '../../marianumconnect_query.dart';
+
+/// Submits an absence report (`POST absence`, bearer-auth, `source=mobile`).
+/// Empty identity fields are backfilled from LDAP server-side; validation
+/// (all fields required, class must exist, no past start date, end >= start)
+/// also runs server-side and mirrors the client checks.
+class AbsenceSubmit extends MarianumConnectQuery {
+  AbsenceSubmit({super.dio});
+
+  Future<void> run({
+    required String firstName,
+    required String lastName,
+    required String className,
+    required DateTime absentFrom,
+    required DateTime absentUntil,
+    required String phone,
+    required String note,
+  }) => guard(() async {
+    await dio.post<void>(
+      endpoint('absence'),
+      data: {
+        'firstName': firstName,
+        'lastName': lastName,
+        'className': className,
+        'absentFrom': isoDate(absentFrom),
+        'absentUntil': isoDate(absentUntil),
+        'phone': phone,
+        'note': note,
+      },
+    );
+  });
+}