import 'package:display/theme/palette.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:shared_preferences/shared_preferences.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();
  final dispatcher = TestWidgetsFlutterBinding.instance.platformDispatcher;
  tearDown(dispatcher.clearPlatformBrightnessTestValue);

  test(
    'auto follows Android, the quick switch holds one, and it is kept',
    () async {
      SharedPreferences.setMockInitialValues({});
      final prefs = await SharedPreferences.getInstance();
      Themes make() =>
          Themes('t', Palette.fallbackDark, Palette.fallbackBright, prefs);
      final t = make();
      var notified = 0;
      t.addListener(() => notified++);

      expect(t.mode, VariantMode.auto);
      dispatcher.platformBrightnessTestValue = Brightness.light;
      expect(t.isDark, isFalse);
      expect(notified, 1); // the binding tells its observers

      t.toggle(); // bright showing: hold dark
      expect((t.mode, t.isDark), (VariantMode.dark, true));
      dispatcher.platformBrightnessTestValue = Brightness.dark;
      dispatcher.platformBrightnessTestValue = Brightness.light;
      expect(notified, 2); // fixed: Android's changes are ignored

      expect(make().mode, VariantMode.dark); // kept for the next start
    },
  );
}