import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_contacts/flutter_contacts.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:ikar/backend/modules/messages.dart';
import 'package:ikar/core/config/app_phonebook_names.dart';
import 'package:ikar/core/contacts/device_contacts_service.dart';
import 'package:shared_preferences/shared_preferences.dart';

const phone = 79000000007;
const channel = MethodChannel('github.com/QuisApp/flutter_contacts');

List<Map<String, dynamic>> book(String name) => [
  Contact(id: '7', displayName: name, phones: [Phone('+79000000007')]).toJson(),
];

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();
  late Future<List<Map<String, dynamic>>> Function() read;
  setUp(() {
    SharedPreferences.setMockInitialValues({});
    ContactCache.resetMemoryForTesting();
    DeviceContactsService.resetMemoryForTesting();
    AppPhonebookNames.current.value = true;
    read = () async => book('Имя из контактов');
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(channel, (call) {
          expect(call.method, 'select');
          return read();
        });
    ContactCache.putPhone(7, phone);
    ContactCache.put(7, 'Серверное имя');
  });
  tearDown(() {
    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
        .setMockMethodCallHandler(channel, null);
    ContactCache.resetMemoryForTesting();
    DeviceContactsService.resetMemoryForTesting();
  });

  testWidgets('chat name stays local throughout a delayed phonebook refresh', (
    tester,
  ) async {
    expect(await DeviceContactsService.readBookForTesting(), isTrue);
    final pending = Completer<List<Map<String, dynamic>>>();
    read = () => pending.future;
    final refresh = DeviceContactsService.readBookForTesting();
    await tester.pump();
    // A server response and widget rebuild arrive while the native reader waits.
    ContactCache.put(7, 'Обновлённое серверное имя');
    await tester.pumpWidget(MaterialApp(home: Text(ContactCache.get(7)!)));
    expect(find.text('Имя из контактов'), findsOneWidget);
    expect(DeviceContactsService.isLoaded, isTrue);
    expect(DeviceContactsService.phonebook['+79000000007'], 'Имя из контактов');
    await tester.pump(const Duration(seconds: 1));
    expect(ContactCache.get(7), 'Имя из контактов');
    pending.complete(book('Имя из контактов'));
    await refresh;
    await tester.pumpWidget(MaterialApp(home: Text(ContactCache.get(7)!)));
    expect(find.text('Имя из контактов'), findsOneWidget);
    expect(find.text('Обновлённое серверное имя'), findsNothing);
    await tester.pump(const Duration(seconds: 3));
    expect(ContactCache.get(7), 'Имя из контактов');
  });

  test('a failed refresh keeps the last successfully loaded names', () async {
    await DeviceContactsService.readBookForTesting();
    read = () async => throw PlatformException(code: 'READ_FAILED');
    expect(await DeviceContactsService.readBookForTesting(), isFalse);
    expect(ContactCache.get(7), 'Имя из контактов');
    expect(DeviceContactsService.isLoaded, isTrue);
    expect(DeviceContactsService.knownNumbers, 1);
  });

  test('a successful refresh applies renamed and deleted contacts', () async {
    await DeviceContactsService.readBookForTesting();
    read = () async => book('Новое имя');
    expect(await DeviceContactsService.readBookForTesting(), isTrue);
    expect(ContactCache.get(7), 'Новое имя');
    read = () async => [];
    expect(await DeviceContactsService.readBookForTesting(), isTrue);
    expect(DeviceContactsService.knownNumbers, 0);
    expect(DeviceContactsService.phonebook, isEmpty);
    expect(ContactCache.get(7), 'Серверное имя');
  });
}