import 'package:buzz/shared/widgets/concentric_sheet_surface.dart';
import 'package:buzz/shared/theme/theme.dart';
import 'package:buzz/shared/widgets/modal_presentation.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets(
    'keeps an opaque Flutter surface when iOS native support is unavailable',
    (tester) async {
      debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
      try {
        await tester.pumpWidget(
          MaterialApp(
            theme: AppTheme.light(),
            home: const ConcentricSheetSurface(
              enabled: true,
              color: Colors.red,
              child: SizedBox(height: 80, child: Text('Sheet body')),
            ),
          ),
        );
        await tester.pumpAndSettle();

        expect(
          find.byWidgetPredicate(
            (widget) => widget is Material && widget.color == Colors.red,
          ),
          findsOneWidget,
        );
        final contentClip = tester.widget<ClipRSuperellipse>(
          find.byKey(const ValueKey('concentric-sheet-content-clip')),
        );
        expect(contentClip.borderRadius, BorderRadius.circular(Radii.dialog));
      } finally {
        debugDefaultTargetPlatformOverride = null;
      }
    },
  );

  testWidgets(
    'replaces the Flutter fallback when native support is available',
    (tester) async {
      debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
      const surfaceChannel = MethodChannel('buzz/concentric_sheet_surface');
      tester.binding.defaultBinaryMessenger.setMockMethodCallHandler(
        surfaceChannel,
        (call) async => call.method == 'isSupported' ? true : null,
      );
      try {
        await tester.pumpWidget(
          MaterialApp(
            theme: AppTheme.light(),
            home: const ConcentricSheetSurface(
              enabled: true,
              color: Colors.red,
              child: SizedBox(height: 80, child: Text('Sheet body')),
            ),
          ),
        );
        await tester.pump();

        expect(find.byType(UiKitView), findsOneWidget);
        expect(
          find.byWidgetPredicate(
            (widget) => widget is Material && widget.color == Colors.red,
          ),
          findsNothing,
        );
      } finally {
        tester.binding.defaultBinaryMessenger.setMockMethodCallHandler(
          surfaceChannel,
          null,
        );
        debugDefaultTargetPlatformOverride = null;
      }
    },
  );

  testWidgets('native titled sheets leave the concentric surface unobscured', (
    tester,
  ) async {
    debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
    const surfaceChannel = MethodChannel('buzz/concentric_sheet_surface');
    tester.binding.defaultBinaryMessenger.setMockMethodCallHandler(
      surfaceChannel,
      (call) async => call.method == 'isSupported' ? true : null,
    );
    try {
      await tester.pumpWidget(
        MaterialApp(
          theme: AppTheme.light(),
          home: Scaffold(
            body: Builder(
              builder: (context) => FilledButton(
                onPressed: () => showBuzzModalBottomSheet<void>(
                  context: context,
                  title: 'Members',
                  builder: (_) => const Text('Sheet body'),
                ),
                child: const Text('Open sheet'),
              ),
            ),
          ),
        ),
      );

      await tester.tap(find.text('Open sheet'));
      await tester.pumpAndSettle();

      final nativeSurface = tester.widget<UiKitView>(
        find.byWidgetPredicate(
          (widget) =>
              widget is UiKitView &&
              widget.viewType == 'buzz/concentric_sheet_surface',
        ),
      );
      expect(
        nativeSurface.creationParams,
        containsPair('color', lightColorScheme.surface.toARGB32()),
      );
      expect(nativeSurface.creationParams, isNot(contains('headerGradient')));
      expect(
        find.byKey(const ValueKey('buzz-sheet-header-gradient')),
        findsNothing,
      );
      expect(
        find.byKey(const ValueKey('buzz-sheet-surface-clip')),
        findsNothing,
      );
      final contentClip = tester.widget<ClipRSuperellipse>(
        find.byKey(const ValueKey('concentric-sheet-content-clip')),
      );
      expect(contentClip.borderRadius, BorderRadius.circular(Radii.dialog * 2));
      expect(contentClip.clipBehavior, Clip.antiAlias);
      expect(find.text('Members'), findsOneWidget);
      final nativeClose = tester.widget<UiKitView>(
        find.byWidgetPredicate(
          (widget) =>
              widget is UiKitView && widget.viewType == 'buzz/navigation_glass',
        ),
      );
      expect(nativeClose.creationParams, containsPair('icon', 'close'));
    } finally {
      tester.binding.defaultBinaryMessenger.setMockMethodCallHandler(
        surfaceChannel,
        null,
      );
      debugDefaultTargetPlatformOverride = null;
    }
  });

  testWidgets(
    'non-iOS sheets use Flutter drag handle and shared close control',
    (tester) async {
      debugDefaultTargetPlatformOverride = TargetPlatform.android;
      try {
        await tester.pumpWidget(
          MaterialApp(
            theme: AppTheme.light(),
            home: Scaffold(
              body: Builder(
                builder: (context) => FilledButton(
                  onPressed: () => showBuzzModalBottomSheet<void>(
                    context: context,
                    title: 'Sheet title',
                    showDragHandle: true,
                    builder: (_) => const Text('Sheet body'),
                  ),
                  child: const Text('Open sheet'),
                ),
              ),
            ),
          ),
        );

        await tester.tap(find.text('Open sheet'));
        await tester.pumpAndSettle();

        final closeButton = find.byTooltip('Close sheet');
        final title = find.byKey(const ValueKey('buzz-sheet-title'));
        expect(closeButton, findsOneWidget);
        expect(title, findsOneWidget);
        expect(
          find.byKey(const ValueKey('buzz-sheet-surface-clip')),
          findsOneWidget,
        );
        expect(tester.getSize(closeButton), const Size.square(44));
        expect(tester.widget<Text>(title).style?.fontSize, 16);
        expect(
          find.byKey(const ValueKey('buzz-sheet-header-gradient')),
          findsNothing,
        );
        expect(
          tester
              .widget<ColoredBox>(
                find.byKey(const ValueKey('buzz-sheet-surface')),
              )
              .color,
          lightColorScheme.surface,
        );
        expect(
          tester.getTopLeft(find.text('Sheet body')).dy -
              tester
                  .getTopLeft(find.byKey(const ValueKey('buzz-sheet-surface')))
                  .dy,
          80,
        );
        expect(find.byType(BackdropFilter), findsNothing);
        expect(
          tester.widget<BottomSheet>(find.byType(BottomSheet)).backgroundColor,
          Colors.transparent,
        );
        expect(
          tester.getCenter(title).dx,
          closeTo(tester.getCenter(find.byType(BottomSheet)).dx, 0.01),
        );
        expect(
          tester.getCenter(title).dy,
          closeTo(tester.getCenter(closeButton).dy, 0.01),
        );
        expect(
          tester.getCenter(closeButton).dx,
          greaterThan(tester.getCenter(title).dx),
        );
        final closeGutter = find.ancestor(
          of: closeButton,
          matching: find.byWidgetPredicate(
            (widget) =>
                widget is Padding &&
                widget.padding ==
                    const EdgeInsets.only(
                      top: Grid.xxs,
                      left: Grid.gutter,
                      right: Grid.gutter,
                      bottom: Grid.xs,
                    ),
          ),
        );
        expect(closeGutter, findsOneWidget);
        final gutterRect = tester.getRect(closeGutter);
        final closeRect = tester.getRect(closeButton);
        expect(closeRect.top - gutterRect.top, Grid.gutter);
        expect(gutterRect.right - closeRect.right, Grid.gutter);
        expect(
          tester.widget<BottomSheet>(find.byType(BottomSheet)).showDragHandle,
          isFalse,
        );
        expect(
          find.byKey(const ValueKey('buzz-sheet-drag-handle')),
          findsOneWidget,
        );
        expect(
          tester.getTopLeft(closeButton).dy -
              tester.getTopLeft(find.byType(BottomSheet)).dy,
          Grid.gutter,
        );
        final dismissHandle = find.bySemanticsLabel('Dismiss').first;
        expect(dismissHandle, findsOneWidget);
        final semantics = tester.getSemantics(dismissHandle);
        expect(semantics.flagsCollection.isButton, isTrue);
        expect(
          semantics.getSemanticsData().hasAction(SemanticsAction.tap),
          isTrue,
        );
        tester.binding.performSemanticsAction(
          SemanticsActionEvent(
            type: SemanticsAction.tap,
            viewId: tester.view.viewId,
            nodeId: semantics.id,
          ),
        );
        await tester.pumpAndSettle();
        expect(find.text('Sheet body'), findsNothing);
      } finally {
        debugDefaultTargetPlatformOverride = null;
      }
    },
  );

  testWidgets('iOS paints the drag handle inside the concentric surface', (
    tester,
  ) async {
    debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
    try {
      await tester.pumpWidget(
        MaterialApp(
          theme: AppTheme.light(),
          home: Scaffold(
            body: Builder(
              builder: (context) => FilledButton(
                onPressed: () => showBuzzModalBottomSheet<void>(
                  context: context,
                  showDragHandle: true,
                  builder: (_) => const Text('Sheet body'),
                ),
                child: const Text('Open sheet'),
              ),
            ),
          ),
        ),
      );

      await tester.tap(find.text('Open sheet'));
      await tester.pumpAndSettle();

      expect(
        tester.widget<BottomSheet>(find.byType(BottomSheet)).showDragHandle,
        isFalse,
      );
      final internalHandle = find.byKey(
        const ValueKey('buzz-sheet-drag-handle'),
      );
      expect(internalHandle, findsOneWidget);
      expect(tester.getSize(internalHandle), const Size(32, 4));
      final dismissHandle = find.bySemanticsLabel('Dismiss');
      expect(dismissHandle, findsOneWidget);
      final semantics = tester.getSemantics(dismissHandle);
      expect(semantics.flagsCollection.isButton, isTrue);
      expect(
        semantics.getSemanticsData().hasAction(SemanticsAction.tap),
        isTrue,
      );
      expect(find.byTooltip('Close sheet'), findsOneWidget);
      expect(find.text('Sheet body'), findsOneWidget);
    } finally {
      debugDefaultTargetPlatformOverride = null;
    }
  });

  testWidgets('iOS compact sheets can omit X but retain the inside handle', (
    tester,
  ) async {
    debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
    try {
      await tester.pumpWidget(
        MaterialApp(
          theme: AppTheme.light(),
          home: Scaffold(
            body: Builder(
              builder: (context) => FilledButton(
                onPressed: () => showBuzzModalBottomSheet<void>(
                  context: context,
                  showDragHandle: true,
                  showCloseButton: false,
                  builder: (_) => const Text('Compact sheet body'),
                ),
                child: const Text('Open compact sheet'),
              ),
            ),
          ),
        ),
      );

      await tester.tap(find.text('Open compact sheet'));
      await tester.pumpAndSettle();

      expect(
        find.byKey(const ValueKey('buzz-sheet-drag-handle')),
        findsOneWidget,
      );
      expect(find.byTooltip('Close sheet'), findsNothing);
      expect(find.text('Compact sheet body'), findsOneWidget);
    } finally {
      debugDefaultTargetPlatformOverride = null;
    }
  });
}