import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:provider/provider.dart';

import 'package:fuel_tax_tracker/screens/data_settings_screen.dart';
import 'package:fuel_tax_tracker/screens/faq_screen.dart';
import 'package:fuel_tax_tracker/screens/settings_screen.dart';
import 'package:fuel_tax_tracker/screens/ui_settings_screen.dart';
import 'package:fuel_tax_tracker/screens/user_agreement_screen.dart';
import 'package:fuel_tax_tracker/services/app_state.dart';

/// Covers the Settings landing page's menu wiring: it groups settings into
/// two submenus — [UiSettingsScreen] (appearance) and [DataSettingsScreen]
/// (cloud storage, photo syncing/quality, advanced/purge) — plus keeps a
/// read-only summary on the landing page itself. The submenu screens'
/// actual contents are covered by theme_toggle_test.dart and
/// settings_purge_test.dart respectively.
void main() {
  Future<void> pumpSettings(WidgetTester tester) async {
    final appState = AppState()..isLoading = false;
    await tester.pumpWidget(
      ChangeNotifierProvider.value(
        value: appState,
        child: const MaterialApp(home: SettingsScreen()),
      ),
    );
  }

  testWidgets('shows UI, Data, FAQ, and User Agreement menu entries, plus the summary',
      (tester) async {
    await pumpSettings(tester);

    expect(find.text('UI'), findsOneWidget);
    expect(find.text('Data'), findsOneWidget);
    expect(find.text('FAQ'), findsOneWidget);
    expect(find.text('User Agreement'), findsOneWidget);
    await tester.scrollUntilVisible(find.text('Summary'), 300, scrollable: find.byType(Scrollable));
    expect(find.text('Summary'), findsOneWidget);
    // None of Data's contents leaked onto the landing page.
    expect(find.text('Cloud Storage'), findsNothing);
    expect(find.text('Advanced'), findsNothing);
  });

  testWidgets('tapping UI opens UiSettingsScreen', (tester) async {
    await pumpSettings(tester);

    await tester.tap(find.text('UI'));
    await tester.pumpAndSettle();

    expect(find.byType(UiSettingsScreen), findsOneWidget);
    expect(find.text('Appearance'), findsOneWidget);
  });

  testWidgets('tapping Data opens DataSettingsScreen', (tester) async {
    await pumpSettings(tester);

    await tester.tap(find.text('Data'));
    await tester.pumpAndSettle();

    expect(find.byType(DataSettingsScreen), findsOneWidget);
    expect(find.text('Cloud Storage'), findsOneWidget);
    await tester.scrollUntilVisible(find.text('Advanced'), 200, scrollable: find.byType(Scrollable));
    expect(find.text('Advanced'), findsOneWidget);
  });

  testWidgets('tapping FAQ opens FaqScreen with its questions collapsed by default',
      (tester) async {
    await pumpSettings(tester);

    await tester.tap(find.text('FAQ'));
    await tester.pumpAndSettle();

    expect(find.byType(FaqScreen), findsOneWidget);
    expect(find.text('What is the Missouri Motor Fuel Tax Refund?'), findsOneWidget);
    // Answers are inside collapsed ExpansionTiles, not visible until tapped.
    expect(find.textContaining('12.5¢ per gallon'), findsNothing);

    await tester.tap(find.text('What is the Missouri Motor Fuel Tax Refund?'));
    await tester.pumpAndSettle();

    expect(find.textContaining('12.5¢ per gallon'), findsOneWidget);
  });

  testWidgets('tapping User Agreement opens it in review mode (no Decline/I Agree)',
      (tester) async {
    await pumpSettings(tester);

    await tester.tap(find.text('User Agreement'));
    await tester.pumpAndSettle();

    expect(find.byType(UserAgreementScreen), findsOneWidget);
    expect(find.widgetWithText(FilledButton, 'I Agree'), findsNothing);
    expect(find.widgetWithText(OutlinedButton, 'Decline'), findsNothing);
  });

  testWidgets('Ads card offers both buying and restoring when ads are not disabled',
      (tester) async {
    await pumpSettings(tester);

    // Not tapped — buyAdFreeYear/restoreAdFreeYear reach a real platform
    // channel via PurchaseService, which isn't set up in this test; only
    // confirming both entry points render.
    expect(find.widgetWithText(FilledButton, 'Remove Ads for a Year'), findsOneWidget);
    expect(find.widgetWithText(TextButton, 'Restore Purchase'), findsOneWidget);
  });
}