import 'package:flutter_test/flutter_test.dart';
import 'package:marianum_mobile/api/marianumconnect/queries/get_capabilities/guardian_child.dart';
import 'package:marianum_mobile/background/widget_background_task.dart';
import 'package:marianum_mobile/session/session.dart';
import 'package:marianum_mobile/state/app/modules/capabilities/bloc/capabilities_state.dart';
import 'package:marianum_mobile/state/app/modules/children/child_selection_cubit.dart';
import 'package:marianum_mobile/state/app/modules/timetable/policy/timetable_policy.dart';
import 'package:marianum_mobile/state/app/modules/timetable/primary/primary_subject_resolver.dart';
import 'package:marianum_mobile/state/app/modules/timetable/subject/timetable_subject.dart';
import 'package:marianum_mobile/view/pages/absence_report/absence_form_policy.dart';
import 'package:marianum_mobile/widget_data/widget_sync.dart';

const _anna = GuardianChild(id: 'a', firstName: 'Anna', lastName: 'X');
const _ben = GuardianChild(id: 'b', firstName: 'Ben', lastName: 'X');
const _guardian = GuardianSession(email: 'e@x.de');
final _student = CredentialSession(username: 'max', password: 'pw');

void main() {
  group('effectiveChild', () {
    test('keeps a still-linked selection', () {
      expect(effectiveChild([_anna, _ben], 'b'), _ben);
    });

    test('falls back to the first child', () {
      expect(effectiveChild([_anna, _ben], null), _anna);
      expect(effectiveChild([_anna, _ben], 'gone'), _anna);
    });

    test('is null without children', () {
      expect(effectiveChild(const [], 'a'), isNull);
    });
  });

  group('resolvePrimarySubject', () {
    test('password accounts see their own plan', () {
      expect(
        resolvePrimarySubject(
          session: _student,
          children: const [],
          selectedChildId: null,
        ),
        const OwnTimetable(),
      );
    });

    test('guardians see the selected child', () {
      expect(
        resolvePrimarySubject(
          session: _guardian,
          children: const [_anna, _ben],
          selectedChildId: 'b',
        ),
        const ChildTimetable('b'),
      );
    });

    test('no plan when signed out or without children', () {
      expect(
        resolvePrimarySubject(
          session: null,
          children: const [],
          selectedChildId: null,
        ),
        const NoTimetable(),
      );
      expect(
        resolvePrimarySubject(
          session: _guardian,
          children: const [],
          selectedChildId: null,
        ),
        const NoTimetable(),
      );
    });
  });

  group('child subject', () {
    test('siblings get separate persistent slots', () {
      expect(
        const ChildTimetable('a').storageId,
        isNot(const ChildTimetable('b').storageId),
      );
      expect(const ChildTimetable('a').persistent, isTrue);
      expect(const ChildTimetable('a').supportsCustomEvents, isFalse);
    });

    test('child plans offer no custom events', () {
      final p = TimetablePolicy.resolve(
        subject: const ChildTimetable('a'),
        capabilities: const CapabilitiesState(userType: 'PARENT'),
      );
      expect(p.canManageCustomEvents, isFalse);
      expect(p.canEditSubjectColors, isTrue);
      expect(p.canOpenForeign, isFalse);
    });
  });

  group('AbsenceFormPolicy', () {
    test('users report for themselves with an editable identity', () {
      final p = AbsenceFormPolicy.resolve(
        session: _student,
        children: const [],
        selectedChildId: null,
      )!;
      expect(p.child, isNull);
      expect(p.identityEditable, isTrue);
    });

    test('guardians report for the selected child', () {
      final p = AbsenceFormPolicy.resolve(
        session: _guardian,
        children: const [_anna, _ben],
        selectedChildId: 'b',
      )!;
      expect(p.child, _ben);
      expect(p.identityEditable, isFalse);
    });

    test('guardians without children cannot report', () {
      expect(
        AbsenceFormPolicy.resolve(
          session: _guardian,
          children: const [],
          selectedChildId: null,
        ),
        isNull,
      );
    });
  });

  group('widget subject', () {
    test('round-trips primary subjects', () {
      for (final subject in const [OwnTimetable(), ChildTimetable('a:b')]) {
        expect(
          WidgetSync.decodeSubject(WidgetSync.encodeSubject(subject)),
          subject,
        );
      }
    });

    test('a missing value is the own plan of older installs', () {
      expect(WidgetSync.decodeSubject(null), const OwnTimetable());
    });

    test('foreign and empty plans never back the widget', () {
      expect(WidgetSync.encodeSubject(const NoTimetable()), isNull);
      expect(WidgetSync.decodeSubject('child:'), isNull);
    });

    test('background refresh follows the session', () {
      expect(
        widgetRefreshSubject(session: _student, stored: null),
        const OwnTimetable(),
      );
      expect(
        widgetRefreshSubject(
          session: _guardian,
          stored: const ChildTimetable('a'),
        ),
        const ChildTimetable('a'),
      );
      // Before the app published a child, a guardian has nothing to fetch.
      expect(
        widgetRefreshSubject(session: _guardian, stored: const OwnTimetable()),
        isNull,
      );
    });
  });
}