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

import 'package:fuel_tax_tracker/screens/faq_screen.dart';

/// Covers [FaqScreen] itself (question list, collapsed-by-default,
/// deep-linking a specific entry open) and [FaqActionButton], the shared
/// "?" AppBar action reused across every tab — see settings_screen_test.dart
/// for the Settings landing page's own FAQ entry, and
/// backup_reminder_test.dart for the "Learn More" link into a specific
/// entry.
void main() {
  testWidgets('every question starts collapsed with no initiallyExpandedQuestion given',
      (tester) async {
    await tester.pumpWidget(const MaterialApp(home: FaqScreen()));

    expect(find.text('What is the Missouri Motor Fuel Tax Refund?'), findsOneWidget);
    expect(find.textContaining('12.5¢ per gallon'), findsNothing);
  });

  testWidgets('groups questions under section headers', (tester) async {
    await tester.pumpWidget(const MaterialApp(home: FaqScreen()));

    // The first section header is visible without scrolling; the last
    // one only reachable by scrolling all the way down — checking both
    // confirms headers span the whole list, not just its start.
    expect(find.text('Missouri Motor Fuel Tax Refund'), findsOneWidget);

    await tester.scrollUntilVisible(find.text('Advertisements'), 300,
        scrollable: find.byType(Scrollable));
    expect(find.text('Advertisements'), findsOneWidget);
  });

  testWidgets('tapping a question expands its answer', (tester) async {
    await tester.pumpWidget(const MaterialApp(home: FaqScreen()));

    await tester.scrollUntilVisible(find.text('How do I remove ads?'), 300,
        scrollable: find.byType(Scrollable));
    // scrollUntilVisible stops as soon as any part is on-screen, which can
    // leave it right at the bottom edge — nudge further so its center
    // (what tap() targets) is comfortably inside the viewport.
    await tester.drag(find.byType(Scrollable), const Offset(0, -100));
    await tester.pumpAndSettle();
    await tester.tap(find.text('How do I remove ads?'));
    await tester.pumpAndSettle();

    expect(find.textContaining("doesn't auto-renew"), findsOneWidget);
  });

  testWidgets('includes a contact email for problem receipts/VINs/errors', (tester) async {
    await tester.pumpWidget(const MaterialApp(home: FaqScreen()));

    await tester.scrollUntilVisible(
        find.text("Found a receipt, VIN, or error the app couldn't handle?"), 300,
        scrollable: find.byType(Scrollable));
    await tester.tap(find.text("Found a receipt, VIN, or error the app couldn't handle?"));
    await tester.pumpAndSettle();

    expect(find.textContaining('ohbrer+ShowMeTheFuelRefund@gmail.com'), findsOneWidget);
  });

  testWidgets('the refund program question covers both highway and non-highway refunds',
      (tester) async {
    await tester.pumpWidget(const MaterialApp(home: FaqScreen()));

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

    expect(find.textContaining('Highway use — up to 12.5¢ per gallon'), findsOneWidget);
    expect(find.textContaining('Non-highway use — up to 29.5¢ per gallon'), findsOneWidget);
    expect(find.textContaining("isn't tax advice"), findsOneWidget);
    expect(find.textContaining('consult a tax professional'), findsOneWidget);
  });

  testWidgets('initiallyExpandedQuestion starts that one entry open, others collapsed',
      (tester) async {
    await tester.pumpWidget(
      const MaterialApp(home: FaqScreen(initiallyExpandedQuestion: 'Is my data backed up?')),
    );
    await tester.pumpAndSettle();

    // Its section (Data Safety) is further down the page now that
    // questions are grouped — scroll to it before checking its content.
    await tester.scrollUntilVisible(find.text('Is my data backed up?'), 300,
        scrollable: find.byType(Scrollable));

    expect(find.textContaining('Not by default'), findsOneWidget);
    expect(find.textContaining('12.5¢ per gallon'), findsNothing,
        reason: 'only the targeted question starts expanded');
  });

  testWidgets('FaqActionButton pushes FaqScreen', (tester) async {
    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(appBar: AppBar(actions: const [FaqActionButton()])),
      ),
    );

    await tester.tap(find.byIcon(Icons.help_outline));
    await tester.pumpAndSettle();

    expect(find.byType(FaqScreen), findsOneWidget);
  });
}