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

void main() {
  testWidgets('stepper blocks forward navigation without image and shows hint',
      (WidgetTester tester) async {
    await tester.pumpWidget(const KorkenMosaicApp());

    expect(find.text('1) Bild'), findsOneWidget);
    expect(find.text('2) Größe'), findsOneWidget);
    expect(find.text('3) Farben'), findsOneWidget);
    expect(find.text('4) Ergebnis'), findsOneWidget);

    await tester.tap(find.text('Weiter'));
    await tester.pump();

    // Stays on step 1 because no source image is available yet.
    expect(find.text('Import target image'), findsOneWidget);
    expect(find.text('Bitte zuerst ein Bild auswählen.'), findsOneWidget);
  });

  testWidgets('generate actions are disabled without image',
      (WidgetTester tester) async {
    await tester.pumpWidget(const KorkenMosaicApp());

    final fab = tester.widget<FloatingActionButton>(
      find.byType(FloatingActionButton),
    );
    expect(fab.onPressed, isNull);

    // Result-step action is not reachable before image selection.
    expect(find.byKey(const Key('generate-btn')), findsNothing);
  });
}