import 'package:flutter/material.dart';
import 'package:lucide_icons_flutter/lucide_icons.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',
      );
    });

    // ── The wash gave way to the brand ──
    //
    // The four tabs wore a 7% frosted brand wash flattened against white while
    // Home wore solid brand. Switching tab therefore changed the colour of the
    // top 76pt of the phone AND the colour of the status-bar glyphs, which
    // reads as arriving in a different app rather than a different page.
    //
    // One ground now, and everything on it inverts. The wash survives as
    // `milerGlassSurface()` for the sheets, which sit over content and still
    // want it.
    // ── The wash gave way to the brand, and the brand grew a gradient ──
    //
    // The four tabs wore a 7% frosted brand wash flattened against white while
    // Home wore solid brand, so switching tab changed the colour of the top
    // 76pt of the phone AND the colour of the status-bar glyphs — which reads
    // as arriving in a different app rather than a different page.
    //
    // One ground now. It is [kBrandGradient] rather than a flat fill: two stops
    // about eight per cent apart, enough that the bar reads as a surface with
    // light on it and not enough to be seen as a gradient. A colour cannot be a
    // gradient, so it rides as `flexibleSpace` — and the fill underneath stays
    // the brand red, so a bar that fails to paint its surface comes out the
    // right colour rather than transparent. Both halves are asserted, because
    // it is the pair that makes the fallback safe.
    testWidgets('is one brand ground, so every tab shares one chrome', (
      tester,
    ) async {
      await pump(
        tester,
        const Scaffold(appBar: MilerAppBar(title: 'Activity')),
      );

      final bar = tester.widget<AppBar>(find.byType(AppBar));
      // ── The fill is transparent, and the surface paints ──
      //
      // It was the brand as a safety net behind [kBrandGradient]. It cannot be
      // one now: the bar's bottom corners are rounded so the page shows through
      // them (see [milerBrandSurface]), and an opaque rectangle behind a
      // rounded surface fills in exactly the two corners the curve exists to
      // open. What must hold is that the bar still *renders* the brand, which
      // is the gradient assertion below.
      expect(bar.backgroundColor, Colors.transparent);
      expect(bar.flexibleSpace, isNotNull);

      final painted = tester
          .widgetList<DecoratedBox>(find.byType(DecoratedBox))
          .map((d) => d.decoration)
          .whereType<BoxDecoration>()
          .where((d) => d.gradient == kBrandGradient);
      expect(painted, isNotEmpty, reason: 'the bar does not wear the brand');
    });

    testWidgets('inverts everything drawn on it', (tester) async {
      await pump(
        tester,
        const Scaffold(appBar: MilerAppBar(title: 'Activity', showBack: true)),
      );

      final title = tester.widget<Text>(find.text('Activity'));
      expect(
        title.style?.color,
        Colors.white,
        reason: 'white on #960019 is the only combination that clears AA here',
      );

      final back = tester.widget<Icon>(find.byIcon(LucideIcons.arrowLeft));
      expect(back.color, Colors.white);

      final bar = tester.widget<AppBar>(find.byType(AppBar));
      expect(
        bar.systemOverlayStyle?.statusBarIconBrightness,
        Brightness.light,
        reason:
            'dark glyphs on maroon is the one contrast failure a rider '
            'cannot work around by tilting the phone',
      );
    });

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

      // The brand ground 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('the pushed-page bar', () {
    // The rule is unchanged and is the whole point of this file: a pushed page
    // and a tab must be the same object at the top of the phone. Only the
    // answer changed — both are solid brand now, rather than both being a wash.
    testWidgets('is the same ground as the tab bars', (tester) async {
      await pump(
        tester,
        Scaffold(appBar: milerPageBar('Rewards', onBack: () {})),
      );

      final bar = tester.widget<AppBar>(find.byType(AppBar));
      // ── The fill is transparent, and the surface paints ──
      //
      // It was the brand as a safety net behind [kBrandGradient]. It cannot be
      // one now: the bar's bottom corners are rounded so the page shows through
      // them (see [milerBrandSurface]), and an opaque rectangle behind a
      // rounded surface fills in exactly the two corners the curve exists to
      // open. What must hold is that the bar still *renders* the brand, which
      // is the gradient assertion below.
      expect(bar.backgroundColor, Colors.transparent);
      expect(bar.flexibleSpace, isNotNull);
      expect(bar.bottom, isNull, reason: 'no rule under the bar here either');
    });
  });
}