import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:integration_test/integration_test.dart';
import 'package:timezone/data/latest.dart' as tzdata;
import 'package:hepan_everyday/app/app_controller.dart';
import 'package:hepan_everyday/main.dart';
import 'package:hepan_everyday/data/file_snapshot_store.dart';
import 'package:hepan_everyday/data/json_schedule_import.dart';
import 'package:hepan_everyday/domain/app_settings.dart';
import 'package:hepan_everyday/domain/course.dart';
import 'package:hepan_everyday/features/profile/import_preview.dart';

import '../test/support/fakes.dart';
import '../test/domain/schedule_engine_test.dart' show course;

void main() {
  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
  setUpAll(tzdata.initializeTimeZones);
  testWidgets(
    'offline import, preview cancellation, color settings and reopening preserve saved courses',
    (tester) async {
      final directory = await Directory.systemTemp.createTemp(
        'hepan-device-test-',
      );
      final store = FileSnapshotStore(directory);
      final controller = AppController(
        store,
        FakeNotifications(),
        FakeCalendar(),
        () => DateTime.utc(2026, 9, 9),
      );
      await controller.initialize();
      await tester.pumpWidget(buildApplication(controller));
      await tester.pumpAndSettle();
      expect(find.bySemanticsLabel('课表'), findsOneWidget);
      await tester.tap(find.bySemanticsLabel('我的'));
      await tester.pumpAndSettle();
      await tester.tap(find.text('课表设置'));
      await tester.pumpAndSettle();
      await tester.tap(find.text('单色'));
      await tester.pumpAndSettle();
      expect(controller.snapshot.settings.colorMode, ColorMode.single);
      // Native file chooser itself is verified manually; preview uses the same UI as file import.
      await tester.scrollUntilVisible(find.byKey(const Key('semester-weeks')),300,
        scrollable:find.byType(Scrollable).last);
      await tester.ensureVisible(find.text('学期开始日'));
      await tester.pumpAndSettle();
      await tester.tap(find.text('学期开始日'));await tester.pumpAndSettle();
      await tester.tap(find.text('确定'));await tester.pumpAndSettle();
      await tester.enterText(find.byKey(const Key('semester-weeks')),'5');
      await tester.ensureVisible(find.text('保存学期设置'));
      await tester.tap(find.text('保存学期设置'));await tester.pumpAndSettle();
      expect(controller.snapshot.settings.semester!.totalWeeks,5);
      expect(controller.snapshot.settings.semester!.startDate,DateTime.utc(2026,9,9));
      final draft = ImportDraft(
        courses: [course(last: 2)],
        explicitlyEmpty: false,
        source: CourseSource.file,
        parserVersion: 'device-json-v1',
      );
      await tester.pumpWidget(
        MaterialApp(
          home: Builder(
            builder: (context) => Scaffold(
              body: TextButton(
                onPressed: () => showModalBottomSheet<void>(
                  context: context,
                  isScrollControlled: true,
                  builder: (_) =>
                      ImportPreview(draft: draft, controller: controller),
                ),
                child: const Text('预览文件'),
              ),
            ),
          ),
        ),
      );
      await tester.pumpAndSettle();
      await tester.tap(find.text('预览文件'));
      await tester.pumpAndSettle();
      await tester.tap(find.text('取消'));
      await tester.pumpAndSettle();
      expect(controller.snapshot.courses, isEmpty);
      await tester.tap(find.text('预览文件'));
      await tester.pumpAndSettle();
      await tester.tap(find.text('确认导入'));
      await tester.pumpAndSettle();
      expect(controller.snapshot.courses.single.id, 'math');
      await tester.pumpWidget(buildApplication(controller));
      await tester.pumpAndSettle();
      expect(find.text('矩阵论'), findsOneWidget);
      final before = await File('${directory.path}/hepan_snapshot.json')
          .readAsString();
      await controller.showDemo();
      await tester.pumpAndSettle();
      expect(find.text('示例课表'), findsOneWidget);
      expect(
        await File('${directory.path}/hepan_snapshot.json').readAsString(),
        before,
      );
      await controller.applyImport(
        const ImportDraft(
          courses: [],
          explicitlyEmpty: false,
          source: CourseSource.file,
          parserVersion: 'bad',
        ),
        confirmedEmpty: false,
      );
      expect(controller.snapshot.courses.single.id, 'math');
      final reopened = AppController(
        store,
        FakeNotifications(),
        FakeCalendar(),
        controller.clock,
      );
      await reopened.initialize();
      expect(reopened.snapshot.courses.single.id, 'math');
      expect(reopened.snapshot.settings.colorMode, ColorMode.single);
      await tester.pumpWidget(const SizedBox());
      controller.dispose();
      reopened.dispose();
      await directory.delete(recursive: true);
    },
  );
}