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

import 'package:miler/views/helpers/constants/Colorconstants.dart';
import 'package:miler/views/helpers/widgets/app_widgets.dart';
import 'package:miler/views/helpers/widgets/miler_app_bar.dart';

/// Two rules the bars now share, and both are the kind that quietly comes
/// undone the next time someone adds a screen:
///
///  • **One line.** The bar carries the page's name and nothing under it. Every
///    caption that used to sit there duplicated a figure the page itself showed
///    louder and lower down, and two sources for one number is how they drift.
///
///  • **One surface.** A frosted brand wash, not a solid slab, so a tab and a
///    pushed page read as the same app at the top of the screen.
void main() {
  Future<void> pump(WidgetTester tester, Widget page) async {
    tester.view.physicalSize = const Size(390 * 3, 844 * 3);
    tester.view.devicePixelRatio = 3.0;
    addTearDown(tester.view.resetPhysicalSize);
    addTearDown(tester.view.resetDevicePixelRatio);

    await tester.pumpWidget(
      ScreenUtilInit(
        designSize: const Size(390, 844),
        builder: (_, _) => MaterialApp(home: page),
      ),
    );
    await tester.pumpAndSettle();
  }

  group('MilerAppBar', () {
    testWidgets('shows the page name and nothing beneath it', (tester) async {
      await pump(tester, const Scaffold(appBar: MilerAppBar(title: 'Activity')));

      expect(find.text('Activity'), findsOneWidget);
      expect(
        tester.widgetList<Text>(find.byType(Text)),
        hasLength(1),
        reason: 'the caption under the title is gone from every bar',
      );
    });

    testWidgets('wears the frosted brand wash, not a solid fill',
        (tester) async {
      await pump(tester, const Scaffold(appBar: MilerAppBar(title: 'Activity')));

      final bar = tester.widget<AppBar>(find.byType(AppBar));
      expect(bar.backgroundColor, Colors.transparent);
      expect(bar.flexibleSpace, isNotNull);
      // A blur is the difference between glass and a tinted box: content
      // passing under the bar softens instead of sliding under a lid.
      expect(find.byType(BackdropFilter), findsOneWidget);
    });

    testWidgets('closes with no rule under it', (tester) async {
      await pump(tester, const Scaffold(appBar: MilerAppBar(title: 'Activity')));

      // The wash is a surface, and a surface against an untinted page is
      // already an edge. A hairline under it drew that boundary a second time —
      // the same doubled-up border this app has been pulling out of its cards.
      final bar = tester.widget<AppBar>(find.byType(AppBar));
      expect(bar.bottom, isNull);
    });

    testWidgets('keeps a trailing slot for the pages that need one',
        (tester) async {
      await pump(
        tester,
        Scaffold(
          appBar: MilerAppBar(
            title: 'My Bookings',
            trailing: const Icon(Icons.map_rounded),
          ),
        ),
      );
      expect(find.byIcon(Icons.map_rounded), findsOneWidget);
    });
  });

  group('appTopBar', () {
    testWidgets('uses the same wash as the tab bars', (tester) async {
      await pump(tester, Scaffold(appBar: milerPageBar('Rewards', onBack: () {})));

      final bar = tester.widget<AppBar>(find.byType(AppBar));
      expect(bar.backgroundColor, Colors.transparent);
      expect(find.byType(BackdropFilter), findsOneWidget);
      expect(bar.bottom, isNull, reason: 'no rule under the glass here either');
    });
  });

  test('the wash is a brand tint light enough to carry near-black type', () {
    // Flattened against white, which is what both the real bars and Home's
    // pinned header composite it over.
    final flat = Color.alphaBlend(ColorConstants.glassRed, Colors.white);
    expect(
      flat.computeLuminance(),
      greaterThan(0.85),
      reason: 'a saturated red bar would force white text onto a mid-tone red, '
          'the weakest contrast pairing in the palette',
    );
  });
}