import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

import 'package:country_picker/country_picker.dart';

import 'package:flutter_test/flutter_test.dart';

import 'package:sxchnge_theme/sxchnge_theme.dart';

import 'package:sxchnge_app/kyc/country.dart';

import 'package:sxchnge_app/generated/i18n/app_localizations.dart';

void main() {
  final search = find.byKey(const ValueKey('country-search'));
  final button = find.byType(OutlinedButton);

  Future<void> mount(
    WidgetTester tester,
    ValueNotifier<String> value, {
    Locale locale = const Locale('en'),
    bool enabled = true,
  }) async {
    await tester.pumpWidget(
      MaterialApp(
        theme: SxchngeTheme.light(),
        locale: locale,
        localizationsDelegates: const [
          ...AppLocalizations.localizationsDelegates,
          CountryLocalizations.delegate,
        ],
        supportedLocales: AppLocalizations.supportedLocales,
        home: Scaffold(
          body: Padding(
            padding: const EdgeInsets.all(24),
            child: ValueListenableBuilder<String>(
              valueListenable: value,
              builder: (_, code, _) => CountryField(
                value: code,
                enabled: enabled,
                onChanged: (code) => value.value = code,
              ),
            ),
          ),
        ),
      ),
    );
    await tester.pumpAndSettle();
  }

  Future<void> open(WidgetTester tester) async {
    await tester.tap(button);
    await tester.pumpAndSettle();
  }

  testWidgets(
    'name search stores code, reselection and cancel preserve value',
    (tester) async {
      final value = ValueNotifier('');
      addTearDown(value.dispose);
      await mount(tester, value);
      expect(find.text('Select a country'), findsOneWidget);
      await open(tester);
      await tester.enterText(search, 'polAND');
      await tester.pumpAndSettle();
      await tester.tap(find.text('Poland'));
      await tester.pumpAndSettle();
      expect(value.value, 'PL');
      expect(find.text('Poland'), findsOneWidget);
      expect(find.text('0/2'), findsNothing);

      await open(tester);
      await tester.enterText(search, '  de  ');
      await tester.pumpAndSettle();
      await tester.tap(find.text('Germany'));
      await tester.pumpAndSettle();
      expect(value.value, 'DE');
      expect(find.text('Germany'), findsOneWidget);

      await open(tester);
      await tester.enterText(search, 'poland');
      await tester.pumpAndSettle();
      await tester.tap(find.byType(BackButton));
      await tester.pumpAndSettle();
      expect(value.value, 'DE');
      expect(find.text('Germany'), findsOneWidget);
    },
  );

  testWidgets('no-results state recovers through clear and Escape cancels', (
    tester,
  ) async {
    final value = ValueNotifier('PL');
    addTearDown(value.dispose);
    await mount(tester, value);
    await open(tester);
    await tester.enterText(search, 'no-such-country');
    await tester.pumpAndSettle();
    expect(find.textContaining('No countries found'), findsOneWidget);
    expect(find.byType(ListTile), findsNothing);
    expect(value.value, 'PL');
    await tester.tap(find.byTooltip('Clear search'));
    await tester.pumpAndSettle();
    expect(find.textContaining('No countries found'), findsNothing);
    expect(find.byType(ListTile), findsWidgets);
    await tester.sendKeyEvent(LogicalKeyboardKey.escape);
    await tester.pumpAndSettle();
    expect(search, findsNothing);
    expect(value.value, 'PL');
  });

  testWidgets('saved code follows locale and Russian names are searchable', (
    tester,
  ) async {
    final value = ValueNotifier('PL');
    addTearDown(value.dispose);
    await mount(tester, value);
    expect(find.text('Poland'), findsOneWidget);
    await mount(tester, value, locale: const Locale('ru'));
    expect(find.text('Польша'), findsOneWidget);
    expect(value.value, 'PL');
    await open(tester);
    await tester.enterText(search, 'Германия');
    await tester.pumpAndSettle();
    await tester.tap(find.byType(ListTile));
    await tester.pumpAndSettle();
    expect(value.value, 'DE');
    expect(find.text('Германия'), findsOneWidget);
  });

  testWidgets('busy field cannot open or change selection', (tester) async {
    final value = ValueNotifier('PL');
    addTearDown(value.dispose);
    await mount(tester, value, enabled: false);
    expect(tester.widget<OutlinedButton>(button).onPressed, isNull);
    await tester.tap(button);
    await tester.pumpAndSettle();
    expect(search, findsNothing);
    expect(value.value, 'PL');
  });

  testWidgets(
    'keyboard and labeled touch targets work at 320px with large text',
    (tester) async {
      tester.view.physicalSize = const Size(320, 900);
      tester.view.devicePixelRatio = 1;
      tester.platformDispatcher.textScaleFactorTestValue = 1.6;
      addTearDown(tester.view.resetPhysicalSize);
      addTearDown(tester.view.resetDevicePixelRatio);
      addTearDown(tester.platformDispatcher.clearTextScaleFactorTestValue);
      final semantics = tester.ensureSemantics();
      final value = ValueNotifier('GS');
      addTearDown(value.dispose);
      await mount(tester, value);
      expect(tester, meetsGuideline(labeledTapTargetGuideline));
      expect(tester, meetsGuideline(androidTapTargetGuideline));
      await tester.sendKeyEvent(LogicalKeyboardKey.tab);
      await tester.sendKeyEvent(LogicalKeyboardKey.enter);
      await tester.pumpAndSettle();
      expect(search, findsOneWidget);
      await tester.enterText(search, 'GS');
      await tester.pumpAndSettle();
      expect(tester.widget<ListTile>(find.byType(ListTile)).selected, isTrue);
      expect(tester, meetsGuideline(labeledTapTargetGuideline));
      expect(tester, meetsGuideline(androidTapTargetGuideline));
      await tester.sendKeyEvent(LogicalKeyboardKey.tab);
      await tester.sendKeyEvent(LogicalKeyboardKey.tab);
      await tester.sendKeyEvent(LogicalKeyboardKey.enter);
      await tester.pumpAndSettle();
      expect(search, findsNothing);
      expect(value.value, 'GS');
      expect(tester.takeException(), isNull);
      semantics.dispose();
    },
  );
}