import 'package:flutter_test/flutter_test.dart';
import 'package:halkyon_ui/halkyon_ui.dart';
import 'package:material_ui/material_ui.dart';

void main() {
  Future<void> show(WidgetTester tester, {bool still = false}) =>
      tester.pumpWidget(
        MaterialApp(
          theme: appTheme(Brightness.light),
          home: MediaQuery(
            data: MediaQueryData(disableAnimations: still),
            child: const Scaffold(
              body: Shimmer(
                child: Column(
                  children: [
                    SkeletonBox(width: 120, height: 18),
                    SkeletonBox(height: 12),
                  ],
                ),
              ),
            ),
          ),
        ),
      );

  testWidgets('a skeleton stands where content will, in the theme’s '
      'muted colour, a light band sweeping across it', (tester) async {
    await show(tester);

    expect(tester.getSize(find.byType(SkeletonBox).first), const Size(120, 18));
    expect(find.byType(ShaderMask), findsOneWidget);
    expect(tester.hasRunningAnimations, isTrue);
    await tester.pump(const Duration(seconds: 1));
    expect(tester.hasRunningAnimations, isTrue, reason: 'sweeping on');
  });

  testWidgets('it stands still where the system asks for no animations', (
    tester,
  ) async {
    await show(tester, still: true);

    expect(find.byType(SkeletonBox), findsNWidgets(2));
    expect(find.byType(ShaderMask), findsNothing);
    expect(tester.hasRunningAnimations, isFalse);
  });
}