import 'package:flutter/material.dart';

import 'package:flutter_test/flutter_test.dart';

import 'package:go_router/go_router.dart';

import 'package:sxchnge_kyc/sxchnge_kyc.dart';

import 'package:sxchnge_wallet/sxchnge_wallet.dart';

import 'package:sxchnge_app/main.dart';
import 'package:sxchnge_app/providers/locale.dart';

Future<void> tap(WidgetTester t, Finder f) async {
  await t.ensureVisible(f);
  await t.tap(f);
  await t.pumpAndSettle();
}

Future<DummyWalletService> open(
  WidgetTester t, {
  String path = '/accounts',
  String locale = 'en',
  Duration settlement = Duration.zero,
}) async {
  t.platformDispatcher.defaultRouteNameTestValue = path;
  addTearDown(t.platformDispatcher.clearDefaultRouteNameTestValue);
  final identity = DummyIdentityService(delay: Duration.zero);
  final service = DummyWalletService(
    identity,
    delay: Duration.zero,
    settlement: settlement,
    initialLocale: locale,
  );
  await t.pumpWidget(
    SxchngeApp(
      identityService: identity,
      walletService: service,
      localeProvider: LocaleProvider(initialLocale: Locale(locale)),
    ),
  );
  await t.pumpAndSettle();
  addTearDown(() => t.pumpWidget(const SizedBox.shrink()));
  return service;
}

void main() {
  testWidgets('available-only accounts expose one set of actions', (t) async {
    await open(t);
    expect(find.text('Reserved'), findsNothing);
    expect(find.text('Held'), findsNothing);
    expect(find.byKey(const ValueKey('exchange-eur')), findsOneWidget);
    expect(find.byKey(const ValueKey('exchange-usd')), findsNothing);
    await tap(t, find.byKey(const ValueKey('account-usd')));
    expect(find.byKey(const ValueKey('topUp-usd')), findsOneWidget);
    expect(find.byKey(const ValueKey('exchange-eur')), findsNothing);
  });
  testWidgets('top-up exchange payout end-to-end and history', (t) async {
    final s = await open(t);
    await tap(t, find.byKey(const ValueKey('topUp-eur')));
    await t.enterText(find.byKey(const ValueKey('transfer-amount')), '10');
    await tap(t, find.byKey(const ValueKey('transfer-review')));
    expect(find.text('You pay'), findsOneWidget);
    await tap(t, find.byKey(const ValueKey('transfer-confirm')));
    expect(find.byKey(const ValueKey('operation-completed')), findsOneWidget);
    expect(
      find.text(
        'Your account has been credited. The money is available to use.',
      ),
      findsOneWidget,
    );
    await tap(t, find.text('Exchange').last);
    await t.enterText(find.byKey(const ValueKey('transfer-amount')), '20');
    await tap(t, find.byKey(const ValueKey('transfer-review')));
    expect(find.text('Leaves your account'), findsOneWidget);
    expect(find.text('Fee'), findsOneWidget);
    await tap(t, find.byKey(const ValueKey('transfer-confirm')));
    expect(find.byKey(const ValueKey('operation-completed')), findsOneWidget);
    await tap(t, find.text('Pay out').last);
    await t.enterText(find.byKey(const ValueKey('transfer-amount')), '5');
    await t.enterText(
      find.byKey(const ValueKey('transfer-recipient')),
      'Sample recipient',
    );
    await tap(t, find.byKey(const ValueKey('transfer-review')));
    expect(find.text('Recipient receives'), findsOneWidget);
    await tap(t, find.byKey(const ValueKey('transfer-confirm')));
    expect(find.byKey(const ValueKey('operation-completed')), findsOneWidget);
    final data = (await t.runAsync(() => s.fetch()))!;
    expect(data.operations.length, 3);
    expect(data.accounts.first.available, 6490);
    expect(data.accounts[1].available, 1600);
  });
  testWidgets(
    'processing payout explains reduced available balance then failed refund',
    (t) async {
      final s = await open(
        t,
        path: '/payout',
        settlement: const Duration(milliseconds: 100),
      );
      s.failNextOperation = true;
      await t.enterText(find.byKey(const ValueKey('transfer-amount')), '10');
      await t.enterText(
        find.byKey(const ValueKey('transfer-recipient')),
        'Sample recipient',
      );
      await tap(t, find.byKey(const ValueKey('transfer-review')));
      await tap(t, find.byKey(const ValueKey('transfer-confirm')));
      // Settlement is service-owned; refresh after the simulated processing period.
      await t.runAsync(
        () => Future<void>.delayed(const Duration(milliseconds: 150)),
      );
      await t.pump(const Duration(seconds: 3));
      await t.pumpAndSettle();
      expect(find.byKey(const ValueKey('operation-failed')), findsOneWidget);
      expect(
        find.text(
          'The transaction did not complete. The amount and fee are available in your account again.',
        ),
        findsOneWidget,
      );
      expect(
        ((await t.runAsync(() => s.fetch()))!).accounts.first.available,
        7500,
      );
    },
  );
  testWidgets(
    'settings saves account language and hides page language selectors',
    (t) async {
      final s = await open(t, path: '/settings');
      expect(find.byKey(const ValueKey('locale-selector')), findsNothing);
      await tap(t, find.byKey(const ValueKey('account-language-en')));
      await tap(t, find.text('Русский').last);
      expect(((await t.runAsync(() => s.profile()))!).locale, 'ru');
      expect(find.text('Язык аккаунта'), findsWidgets);
    },
  );
  testWidgets(
    'language save failure retains session choice and provides retry',
    (t) async {
      final s = await open(t, path: '/settings');
      s.nextError = WalletError.unavailable;
      await tap(t, find.byKey(const ValueKey('account-language-en')));
      await tap(t, find.text('Русский').last);
      expect(
        find.text(
          'Изменено для текущей сессии, но не сохранено в аккаунте. Повторите попытку ниже.',
        ),
        findsOneWidget,
      );
      expect(((await t.runAsync(() => s.profile()))!).locale, 'en');
      await tap(t, find.text('Обновить').last);
      expect(((await t.runAsync(() => s.profile()))!).locale, 'ru');
    },
  );
  testWidgets(
    'insufficient funds preserves entered amount and can be corrected',
    (t) async {
      await open(t, path: '/exchange');
      await t.enterText(find.byKey(const ValueKey('transfer-amount')), '900');
      await tap(t, find.byKey(const ValueKey('transfer-review')));
      expect(find.byKey(const ValueKey('transfer-error')), findsOneWidget);
      expect(find.text('900'), findsOneWidget);
      await t.enterText(find.byKey(const ValueKey('transfer-amount')), '5');
      await tap(t, find.byKey(const ValueKey('transfer-review')));
      expect(find.byKey(const ValueKey('transfer-confirm')), findsOneWidget);
    },
  );
  testWidgets('uncertain submission checks outcome instead of sending twice', (
    t,
  ) async {
    final s = await open(t, path: '/exchange');
    await t.enterText(find.byKey(const ValueKey('transfer-amount')), '5');
    await tap(t, find.byKey(const ValueKey('transfer-review')));
    s.loseNextResponse = true;
    await tap(t, find.byKey(const ValueKey('transfer-confirm')));
    expect(find.text('Check outcome'), findsOneWidget);
    await tap(t, find.text('Check outcome'));
    expect(((await t.runAsync(() => s.fetch()))!).operations.length, 1);
    expect(find.byKey(const ValueKey('operation-completed')), findsOneWidget);
  });
  for (final path in [
    '/accounts',
    '/exchange',
    '/payout',
    '/activity',
    '/limits',
    '/settings',
  ]) {
    testWidgets('$path fits Russian at 320px with larger text', (t) async {
      t.view.physicalSize = const Size(320, 1100);
      t.view.devicePixelRatio = 1;
      t.platformDispatcher.textScaleFactorTestValue = 1.6;
      addTearDown(t.view.resetPhysicalSize);
      addTearDown(t.view.resetDevicePixelRatio);
      addTearDown(t.platformDispatcher.clearTextScaleFactorTestValue);
      await open(t, path: path, locale: 'ru');
      expect(t.takeException(), null);
      if (path == '/exchange') {
        await t.enterText(find.byKey(const ValueKey('transfer-amount')), '5');
        await tap(t, find.byKey(const ValueKey('transfer-review')));
        expect(t.takeException(), null);
      }
    });
  }
  testWidgets('leaving a draft requires a clear discard choice', (t) async {
    await open(t, path: '/exchange');
    await t.enterText(find.byKey(const ValueKey('transfer-amount')), '5');
    final router = GoRouter.of(
      t.element(find.byKey(const ValueKey('transfer-amount'))),
    );
    router.go('/accounts');
    await t.pumpAndSettle();
    expect(find.text('Leave this transaction?'), findsOneWidget);
    await tap(t, find.text('Keep editing'));
    expect(find.text('5'), findsOneWidget);
  });
}