// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

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

import '../widgets/semantics_tester.dart';

void main() {
  // Pumps and ensures that the BottomSheet animates non-linearly.
  Future<void> _checkNonLinearAnimation(WidgetTester tester) async {
    final Offset firstPosition = tester.getCenter(find.text('BottomSheet'));
    await tester.pump(const Duration(milliseconds: 30));
    final Offset secondPosition = tester.getCenter(find.text('BottomSheet'));
    await tester.pump(const Duration(milliseconds: 30));
    final Offset thirdPosition = tester.getCenter(find.text('BottomSheet'));

    final double dyDelta1 = secondPosition.dy - firstPosition.dy;
    final double dyDelta2 = thirdPosition.dy - secondPosition.dy;

    // If the animation were linear, these two values would be the same.
    expect(dyDelta1, isNot(moreOrLessEquals(dyDelta2, epsilon: 0.1)));
  }

  testWidgets('Throw if enable drag without an animation controller', (WidgetTester tester) async {
    // Regression test for https://github.com/flutter/flutter/issues/89168
    await tester.pumpWidget(
      MaterialApp(
        home: BottomSheet(
          onClosing: () {},
          builder: (_) => Container(
            height: 200,
            color: Colors.red,
            child: const Text('BottomSheet'),
          ),
        ),
      ),
    );

    final FlutterExceptionHandler? handler = FlutterError.onError;
    FlutterErrorDetails? error;
    FlutterError.onError = (FlutterErrorDetails details) {
      error = details;
    };

    await tester.drag(find.text('BottomSheet'), const Offset(0.0, 150.0));

    expect(error, isNotNull);
    FlutterError.onError = handler;
  });

  testWidgets('Disposing app while bottom sheet is disappearing does not crash', (WidgetTester tester) async {
    late BuildContext savedContext;

    await tester.pumpWidget(
      MaterialApp(
        home: Builder(
          builder: (BuildContext context) {
            savedContext = context;
            return Container();
          },
        ),
      ),
    );

    await tester.pump();
    expect(find.text('BottomSheet'), findsNothing);

    // Bring up bottom sheet.
    bool showBottomSheetThenCalled = false;
    showModalBottomSheet<void>(
      context: savedContext,
      builder: (BuildContext context) => const Text('BottomSheet'),
    ).then<void>((void value) {
      showBottomSheetThenCalled = true;
    });
    await tester.pumpAndSettle();
    expect(find.text('BottomSheet'), findsOneWidget);
    expect(showBottomSheetThenCalled, isFalse);

    // Start closing animation of Bottom sheet.
    tester.state<NavigatorState>(find.byType(Navigator)).pop();
    await tester.pump();

    // Dispose app by replacing it with a container. This shouldn't crash.
    await tester.pumpWidget(Container());
  });


  testWidgets('Swiping down a BottomSheet should dismiss it by default', (WidgetTester tester) async {

    final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();
    bool showBottomSheetThenCalled = false;

    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        key: scaffoldKey,
        body: const Center(child: Text('body')),
      ),
    ));

    await tester.pump();
    expect(showBottomSheetThenCalled, isFalse);
    expect(find.text('BottomSheet'), findsNothing);

    scaffoldKey.currentState!.showBottomSheet<void>((BuildContext context) {
      return const SizedBox(
        height: 200.0,
        child:  Text('BottomSheet'),
      );
    }).closed.whenComplete(() {
      showBottomSheetThenCalled = true;
    });

    await tester.pumpAndSettle();
    expect(showBottomSheetThenCalled, isFalse);
    expect(find.text('BottomSheet'), findsOneWidget);

    // Swipe the bottom sheet to dismiss it.
    await tester.drag(find.text('BottomSheet'), const Offset(0.0, 150.0));
    await tester.pumpAndSettle(); // Bottom sheet dismiss animation.
    expect(showBottomSheetThenCalled, isTrue);
    expect(find.text('BottomSheet'), findsNothing);
  });

  testWidgets('Swiping down a BottomSheet should not dismiss it when enableDrag is false', (WidgetTester tester) async {

    final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();
    bool showBottomSheetThenCalled = false;

    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        key: scaffoldKey,
        body: const Center(child: Text('body')),
      ),
    ));

    await tester.pump();
    expect(showBottomSheetThenCalled, isFalse);
    expect(find.text('BottomSheet'), findsNothing);

    scaffoldKey.currentState!.showBottomSheet<void>((BuildContext context) {
      return const SizedBox(
        height: 200.0,
        child: Text('BottomSheet'),
      );
    },
    enableDrag: false
    ).closed.whenComplete(() {
      showBottomSheetThenCalled = true;
    });

    await tester.pumpAndSettle();
    expect(showBottomSheetThenCalled, isFalse);
    expect(find.text('BottomSheet'), findsOneWidget);

    // Swipe the bottom sheet, attempting to dismiss it.
    await tester.drag(find.text('BottomSheet'), const Offset(0.0, 150.0));
    await tester.pumpAndSettle(); // Bottom sheet should not dismiss.
    expect(showBottomSheetThenCalled, isFalse);
    expect(find.text('BottomSheet'), findsOneWidget);
  });

  testWidgets('Swiping down a BottomSheet should dismiss it when enableDrag is true', (WidgetTester tester) async {
    final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();
    bool showBottomSheetThenCalled = false;

    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        key: scaffoldKey,
        body: const Center(child: Text('body')),
      ),
    ));

    await tester.pump();
    expect(showBottomSheetThenCalled, isFalse);
    expect(find.text('BottomSheet'), findsNothing);

    scaffoldKey.currentState!.showBottomSheet<void>((BuildContext context) {
      return const SizedBox(
        height: 200.0,
        child: Text('BottomSheet'),
      );
    },
     enableDrag: true
    ).closed.whenComplete(() {
      showBottomSheetThenCalled = true;
    });

    await tester.pumpAndSettle();
    expect(showBottomSheetThenCalled, isFalse);
    expect(find.text('BottomSheet'), findsOneWidget);

    // Swipe the bottom sheet to dismiss it.
    await tester.drag(find.text('BottomSheet'), const Offset(0.0, 150.0));
    await tester.pumpAndSettle(); // Bottom sheet dismiss animation.
    expect(showBottomSheetThenCalled, isTrue);
    expect(find.text('BottomSheet'), findsNothing);
  });

  testWidgets('Modal BottomSheet builder should only be called once', (WidgetTester tester) async {
    late BuildContext savedContext;

    await tester.pumpWidget(MaterialApp(
      home: Builder(
        builder: (BuildContext context) {
          savedContext = context;
          return Container();
        },
      ),
    ));

    int numBuilderCalls = 0;
    showModalBottomSheet<void>(
      context: savedContext,
      isDismissible: false,
      enableDrag: true,
      builder: (BuildContext context) {
        numBuilderCalls++;
        return const Text('BottomSheet');
      },
    );

    await tester.pumpAndSettle();
    expect(numBuilderCalls, 1);

    // Swipe the bottom sheet to dismiss it.
    await tester.drag(find.text('BottomSheet'), const Offset(0.0, 150.0));
    await tester.pumpAndSettle(); // Bottom sheet dismiss animation.
    expect(numBuilderCalls, 1);
  });

  testWidgets('Tapping on a modal BottomSheet should not dismiss it', (WidgetTester tester) async {
    late BuildContext savedContext;

    await tester.pumpWidget(
      MaterialApp(
        home: Builder(
          builder: (BuildContext context) {
            savedContext = context;
            return Container();
          },
        ),
      ),
    );

    await tester.pump();
    expect(find.text('BottomSheet'), findsNothing);

    bool showBottomSheetThenCalled = false;
    showModalBottomSheet<void>(
      context: savedContext,
      builder: (BuildContext context) => const Text('BottomSheet'),
    ).then<void>((void value) {
      showBottomSheetThenCalled = true;
    });

    await tester.pumpAndSettle();
    expect(find.text('BottomSheet'), findsOneWidget);
    expect(showBottomSheetThenCalled, isFalse);

    // Tap on the bottom sheet itself, it should not be dismissed
    await tester.tap(find.text('BottomSheet'));
    await tester.pumpAndSettle();
    expect(find.text('BottomSheet'), findsOneWidget);
    expect(showBottomSheetThenCalled, isFalse);
  });

  testWidgets('Tapping outside a modal BottomSheet should dismiss it by default', (WidgetTester tester) async {
    late BuildContext savedContext;

    await tester.pumpWidget(MaterialApp(
      home: Builder(
        builder: (BuildContext context) {
          savedContext = context;
          return Container();
        },
      ),
    ));

    await tester.pump();
    expect(find.text('BottomSheet'), findsNothing);

    bool showBottomSheetThenCalled = false;
    showModalBottomSheet<void>(
      context: savedContext,
      builder: (BuildContext context) => const Text('BottomSheet'),
    ).then<void>((void value) {
      showBottomSheetThenCalled = true;
    });

    await tester.pumpAndSettle();
    expect(find.text('BottomSheet'), findsOneWidget);
    expect(showBottomSheetThenCalled, isFalse);

    // Tap above the bottom sheet to dismiss it.
    await tester.tapAt(const Offset(20.0, 20.0));
    await tester.pumpAndSettle(); // Bottom sheet dismiss animation.
    expect(showBottomSheetThenCalled, isTrue);
    expect(find.text('BottomSheet'), findsNothing);
  });

  testWidgets('Tapping outside a modal BottomSheet should dismiss it when isDismissible=true', (WidgetTester tester) async {
    late BuildContext savedContext;

    await tester.pumpWidget(MaterialApp(
      home: Builder(
        builder: (BuildContext context) {
          savedContext = context;
          return Container();
        },
      ),
    ));

    await tester.pump();
    expect(find.text('BottomSheet'), findsNothing);

    bool showBottomSheetThenCalled = false;
    showModalBottomSheet<void>(
      context: savedContext,
      builder: (BuildContext context) => const Text('BottomSheet'),
      isDismissible: true,
    ).then<void>((void value) {
      showBottomSheetThenCalled = true;
    });

    await tester.pumpAndSettle();
    expect(find.text('BottomSheet'), findsOneWidget);
    expect(showBottomSheetThenCalled, isFalse);

    // Tap above the bottom sheet to dismiss it.
    await tester.tapAt(const Offset(20.0, 20.0));
    await tester.pumpAndSettle(); // Bottom sheet dismiss animation.
    expect(showBottomSheetThenCalled, isTrue);
    expect(find.text('BottomSheet'), findsNothing);
  });

  testWidgets('Verify that the BottomSheet animates non-linearly', (WidgetTester tester) async {
    late BuildContext savedContext;

    await tester.pumpWidget(MaterialApp(
      home: Builder(
        builder: (BuildContext context) {
          savedContext = context;
          return Container();
        },
      ),
    ));

    await tester.pump();
    expect(find.text('BottomSheet'), findsNothing);

    showModalBottomSheet<void>(
      context: savedContext,
      builder: (BuildContext context) => const Text('BottomSheet'),
    );
    await tester.pump();

    await _checkNonLinearAnimation(tester);
    await tester.pumpAndSettle();

    // Tap above the bottom sheet to dismiss it.
    await tester.tapAt(const Offset(20.0, 20.0));
    await tester.pump();
    await _checkNonLinearAnimation(tester);
    await tester.pumpAndSettle(); // Bottom sheet dismiss animation.
    expect(find.text('BottomSheet'), findsNothing);
  });

  testWidgets('Tapping outside a modal BottomSheet should not dismiss it when isDismissible=false', (WidgetTester tester) async {
    late BuildContext savedContext;

    await tester.pumpWidget(
      MaterialApp(
        home: Builder(
          builder: (BuildContext context) {
            savedContext = context;
            return Container();
          },
        ),
      ),
    );

    await tester.pump();
    expect(find.text('BottomSheet'), findsNothing);

    bool showBottomSheetThenCalled = false;
    showModalBottomSheet<void>(
      context: savedContext,
      builder: (BuildContext context) => const Text('BottomSheet'),
      isDismissible: false,
    ).then<void>((void value) {
      showBottomSheetThenCalled = true;
    });

    await tester.pumpAndSettle();
    expect(find.text('BottomSheet'), findsOneWidget);
    expect(showBottomSheetThenCalled, isFalse);

    // Tap above the bottom sheet, attempting to dismiss it.
    await tester.tapAt(const Offset(20.0, 20.0));
    await tester.pumpAndSettle(); // Bottom sheet should not dismiss.
    expect(showBottomSheetThenCalled, isFalse);
    expect(find.text('BottomSheet'), findsOneWidget);
  });

  testWidgets('Swiping down a modal BottomSheet should dismiss it by default', (WidgetTester tester) async {
    late BuildContext savedContext;

    await tester.pumpWidget(MaterialApp(
      home: Builder(
        builder: (BuildContext context) {
          savedContext = context;
          return Container();
        },
      ),
    ));

    await tester.pump();
    expect(find.text('BottomSheet'), findsNothing);

    bool showBottomSheetThenCalled = false;
    showModalBottomSheet<void>(
      context: savedContext,
      isDismissible: false,
      builder: (BuildContext context) => const Text('BottomSheet'),
    ).then<void>((void value) {
      showBottomSheetThenCalled = true;
    });

    await tester.pumpAndSettle();
    expect(find.text('BottomSheet'), findsOneWidget);
    expect(showBottomSheetThenCalled, isFalse);

    // Swipe the bottom sheet to dismiss it.
    await tester.drag(find.text('BottomSheet'), const Offset(0.0, 150.0));
    await tester.pumpAndSettle(); // Bottom sheet dismiss animation.
    expect(showBottomSheetThenCalled, isTrue);
    expect(find.text('BottomSheet'), findsNothing);
  });

  testWidgets('Swiping down a modal BottomSheet should not dismiss it when enableDrag is false', (WidgetTester tester) async {
    late BuildContext savedContext;

    await tester.pumpWidget(MaterialApp(
      home: Builder(
        builder: (BuildContext context) {
          savedContext = context;
          return Container();
        },
      ),
    ));

    await tester.pump();
    expect(find.text('BottomSheet'), findsNothing);

    bool showBottomSheetThenCalled = false;
    showModalBottomSheet<void>(
      context: savedContext,
      isDismissible: false,
      enableDrag: false,
      builder: (BuildContext context) => const Text('BottomSheet'),
    ).then<void>((void value) {
      showBottomSheetThenCalled = true;
    });

    await tester.pumpAndSettle();
    expect(find.text('BottomSheet'), findsOneWidget);
    expect(showBottomSheetThenCalled, isFalse);

    // Swipe the bottom sheet, attempting to dismiss it.
    await tester.drag(find.text('BottomSheet'), const Offset(0.0, 150.0));
    await tester.pumpAndSettle(); // Bottom sheet should not dismiss.
    expect(showBottomSheetThenCalled, isFalse);
    expect(find.text('BottomSheet'), findsOneWidget);
  });

  testWidgets('Swiping down a modal BottomSheet should dismiss it when enableDrag is true', (WidgetTester tester) async {
    late BuildContext savedContext;

    await tester.pumpWidget(MaterialApp(
      home: Builder(
        builder: (BuildContext context) {
          savedContext = context;
          return Container();
        },
      ),
    ));

    await tester.pump();
    expect(find.text('BottomSheet'), findsNothing);

    bool showBottomSheetThenCalled = false;
    showModalBottomSheet<void>(
      context: savedContext,
      isDismissible: false,
      enableDrag: true,
      builder: (BuildContext context) => const Text('BottomSheet'),
    ).then<void>((void value) {
      showBottomSheetThenCalled = true;
    });

    await tester.pumpAndSettle();
    expect(find.text('BottomSheet'), findsOneWidget);
    expect(showBottomSheetThenCalled, isFalse);

    // Swipe the bottom sheet to dismiss it.
    await tester.drag(find.text('BottomSheet'), const Offset(0.0, 150.0));
    await tester.pumpAndSettle(); // Bottom sheet dismiss animation.
    expect(showBottomSheetThenCalled, isTrue);
    expect(find.text('BottomSheet'), findsNothing);
  });

  testWidgets('Modal BottomSheet builder should only be called once', (WidgetTester tester) async {
    late BuildContext savedContext;

    await tester.pumpWidget(MaterialApp(
      home: Builder(
        builder: (BuildContext context) {
          savedContext = context;
          return Container();
        },
      ),
    ));

    int numBuilderCalls = 0;
    showModalBottomSheet<void>(
      context: savedContext,
      isDismissible: false,
      enableDrag: true,
      builder: (BuildContext context) {
        numBuilderCalls++;
        return const Text('BottomSheet');
      },
    );

    await tester.pumpAndSettle();
    expect(numBuilderCalls, 1);

    // Swipe the bottom sheet to dismiss it.
    await tester.drag(find.text('BottomSheet'), const Offset(0.0, 150.0));
    await tester.pumpAndSettle(); // Bottom sheet dismiss animation.
    expect(numBuilderCalls, 1);
  });

  testWidgets('Verify that a downwards fling dismisses a persistent BottomSheet', (WidgetTester tester) async {
    final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();
    bool showBottomSheetThenCalled = false;

    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        key: scaffoldKey,
        body: const Center(child: Text('body')),
      ),
    ));

    expect(showBottomSheetThenCalled, isFalse);
    expect(find.text('BottomSheet'), findsNothing);

    scaffoldKey.currentState!.showBottomSheet<void>((BuildContext context) {
      return Container(
        margin: const EdgeInsets.all(40.0),
        child: const Text('BottomSheet'),
      );
    }).closed.whenComplete(() {
      showBottomSheetThenCalled = true;
    });

    expect(showBottomSheetThenCalled, isFalse);
    expect(find.text('BottomSheet'), findsNothing);

    await tester.pump(); // bottom sheet show animation starts

    expect(showBottomSheetThenCalled, isFalse);
    expect(find.text('BottomSheet'), findsOneWidget);

    await tester.pump(const Duration(seconds: 1)); // animation done

    expect(showBottomSheetThenCalled, isFalse);
    expect(find.text('BottomSheet'), findsOneWidget);

    // The fling below must be such that the velocity estimation examines an
    // offset greater than the kTouchSlop. Too slow or too short a distance, and
    // it won't trigger. Also, it must not be so much that it drags the bottom
    // sheet off the screen, or we won't see it after we pump!
    await tester.fling(find.text('BottomSheet'), const Offset(0.0, 50.0), 2000.0);
    await tester.pump(); // drain the microtask queue (Future completion callback)

    expect(showBottomSheetThenCalled, isTrue);
    expect(find.text('BottomSheet'), findsOneWidget);

    await tester.pump(); // bottom sheet dismiss animation starts

    expect(showBottomSheetThenCalled, isTrue);
    expect(find.text('BottomSheet'), findsOneWidget);

    await tester.pump(const Duration(seconds: 1)); // animation done

    expect(showBottomSheetThenCalled, isTrue);
    expect(find.text('BottomSheet'), findsNothing);
  });

  testWidgets('Verify that dragging past the bottom dismisses a persistent BottomSheet', (WidgetTester tester) async {
    // This is a regression test for https://github.com/flutter/flutter/issues/5528
    final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();

    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        key: scaffoldKey,
        body: const Center(child: Text('body')),
      ),
    ));

    scaffoldKey.currentState!.showBottomSheet<void>((BuildContext context) {
      return Container(
        margin: const EdgeInsets.all(40.0),
        child: const Text('BottomSheet'),
      );
    });

    await tester.pump(); // bottom sheet show animation starts
    await tester.pump(const Duration(seconds: 1)); // animation done
    expect(find.text('BottomSheet'), findsOneWidget);

    await tester.fling(find.text('BottomSheet'), const Offset(0.0, 400.0), 1000.0);
    await tester.pump(); // drain the microtask queue (Future completion callback)
    await tester.pump(); // bottom sheet dismiss animation starts
    await tester.pump(const Duration(seconds: 1)); // animation done

    expect(find.text('BottomSheet'), findsNothing);
  });

  testWidgets('modal BottomSheet has no top MediaQuery', (WidgetTester tester) async {
    late BuildContext outerContext;
    late BuildContext innerContext;

    await tester.pumpWidget(Localizations(
      locale: const Locale('en', 'US'),
      delegates: const <LocalizationsDelegate<dynamic>>[
        DefaultWidgetsLocalizations.delegate,
        DefaultMaterialLocalizations.delegate,
      ],
      child: Directionality(
        textDirection: TextDirection.ltr,
        child: MediaQuery(
          data: const MediaQueryData(
            padding: EdgeInsets.all(50.0),
            size: Size(400.0, 600.0),
          ),
          child: Navigator(
            onGenerateRoute: (_) {
              return PageRouteBuilder<void>(
                pageBuilder: (BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation) {
                  outerContext = context;
                  return Container();
                },
              );
            },
          ),
        ),
      ),
    ));

    showModalBottomSheet<void>(
      context: outerContext,
      builder: (BuildContext context) {
        innerContext = context;
        return Container();
      },
    );
    await tester.pump();
    await tester.pump(const Duration(seconds: 1));

    expect(
      MediaQuery.of(outerContext).padding,
      const EdgeInsets.all(50.0),
    );
    expect(
      MediaQuery.of(innerContext).padding,
      const EdgeInsets.only(left: 50.0, right: 50.0, bottom: 50.0),
    );
  });

  testWidgets('modal BottomSheet has semantics', (WidgetTester tester) async {
    final SemanticsTester semantics = SemanticsTester(tester);
    final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();

    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        key: scaffoldKey,
        body: const Center(child: Text('body')),
      ),
    ));


    showModalBottomSheet<void>(context: scaffoldKey.currentContext!, builder: (BuildContext context) {
      return const Text('BottomSheet');
    });

    await tester.pump(); // bottom sheet show animation starts
    await tester.pump(const Duration(seconds: 1)); // animation done

    expect(semantics, hasSemantics(TestSemantics.root(
      children: <TestSemantics>[
        TestSemantics.rootChild(
          children: <TestSemantics>[
            TestSemantics(
              children: <TestSemantics>[
                TestSemantics(
                  label: 'Dialog',
                  textDirection: TextDirection.ltr,
                  flags: <SemanticsFlag>[
                    SemanticsFlag.scopesRoute,
                    SemanticsFlag.namesRoute,
                  ],
                  children: <TestSemantics>[
                    TestSemantics(
                      label: 'BottomSheet',
                      textDirection: TextDirection.ltr,
                    ),
                  ],
                ),
              ],
            ),
            TestSemantics(),
          ],
        ),
      ],
    ), ignoreTransform: true, ignoreRect: true, ignoreId: true));
    semantics.dispose();
  });

  testWidgets('Verify that visual properties are passed through', (WidgetTester tester) async {
    final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();
    const Color color = Colors.pink;
    const double elevation = 9.0;
    const ShapeBorder shape = BeveledRectangleBorder(borderRadius: BorderRadius.all(Radius.circular(12)));
    const Clip clipBehavior = Clip.antiAlias;
    const Color barrierColor = Colors.red;

    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        key: scaffoldKey,
        body: const Center(child: Text('body')),
      ),
    ));

    showModalBottomSheet<void>(
      context: scaffoldKey.currentContext!,
      backgroundColor: color,
      barrierColor: barrierColor,
      elevation: elevation,
      shape: shape,
      clipBehavior: clipBehavior,
      builder: (BuildContext context) {
        return const Text('BottomSheet');
      },
    );

    await tester.pump();
    await tester.pump(const Duration(seconds: 1));

    final BottomSheet bottomSheet = tester.widget(find.byType(BottomSheet));
    expect(bottomSheet.backgroundColor, color);
    expect(bottomSheet.elevation, elevation);
    expect(bottomSheet.shape, shape);
    expect(bottomSheet.clipBehavior, clipBehavior);

    final ModalBarrier modalBarrier = tester.widget(find.byType(ModalBarrier).last);
    expect(modalBarrier.color, barrierColor);
  });

  testWidgets('modal BottomSheet with scrollController has semantics', (WidgetTester tester) async {
    final SemanticsTester semantics = SemanticsTester(tester);
    final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();

    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        key: scaffoldKey,
        body: const Center(child: Text('body')),
      ),
    ));


    showModalBottomSheet<void>(
      context: scaffoldKey.currentContext!,
      builder: (BuildContext context) {
        return DraggableScrollableSheet(
          expand: false,
          builder: (_, ScrollController controller) {
            return SingleChildScrollView(
              controller: controller,
              child: const Text('BottomSheet'),
            );
          },
        );
      },
    );

    await tester.pump(); // bottom sheet show animation starts
    await tester.pump(const Duration(seconds: 1)); // animation done

    expect(semantics, hasSemantics(TestSemantics.root(
      children: <TestSemantics>[
        TestSemantics.rootChild(
          children: <TestSemantics>[
            TestSemantics(
              children: <TestSemantics>[
                TestSemantics(
                  label: 'Dialog',
                  textDirection: TextDirection.ltr,
                  flags: <SemanticsFlag>[
                    SemanticsFlag.scopesRoute,
                    SemanticsFlag.namesRoute,
                  ],
                  children: <TestSemantics>[
                    TestSemantics(
                      flags: <SemanticsFlag>[SemanticsFlag.hasImplicitScrolling],
                      actions: <SemanticsAction>[SemanticsAction.scrollDown, SemanticsAction.scrollUp],
                      children: <TestSemantics>[
                        TestSemantics(
                          label: 'BottomSheet',
                          textDirection: TextDirection.ltr,
                        ),
                      ],
                    ),
                  ],
                ),
              ],
            ),
            TestSemantics(),
          ],
        ),
      ],
    ), ignoreTransform: true, ignoreRect: true, ignoreId: true));
    semantics.dispose();
  });

  testWidgets('showModalBottomSheet does not use root Navigator by default', (WidgetTester tester) async {
    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        body: Navigator(onGenerateRoute: (RouteSettings settings) => MaterialPageRoute<void>(builder: (_) {
          return const _TestPage();
        })),
        bottomNavigationBar: BottomNavigationBar(
          items: const <BottomNavigationBarItem>[
            BottomNavigationBarItem(
              icon: Icon(Icons.ac_unit),
              label: 'Item 1',
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.style),
              label: 'Item 2',
            ),
          ],
        ),
      ),
    ));

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

    // Bottom sheet is displayed in correct position within the inner navigator
    // and above the BottomNavigationBar.
    expect(tester.getBottomLeft(find.byType(BottomSheet)).dy, 544.0);
  });

  testWidgets('showModalBottomSheet uses root Navigator when specified', (WidgetTester tester) async {
    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        body: Navigator(onGenerateRoute: (RouteSettings settings) => MaterialPageRoute<void>(builder: (_) {
          return const _TestPage(useRootNavigator: true);
        })),
        bottomNavigationBar: BottomNavigationBar(
          items: const <BottomNavigationBarItem>[
            BottomNavigationBarItem(
              icon: Icon(Icons.ac_unit),
              label: 'Item 1',
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.style),
              label: 'Item 2',
            ),
          ],
        ),
      ),
    ));

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

    // Bottom sheet is displayed in correct position above all content including
    // the BottomNavigationBar.
    expect(tester.getBottomLeft(find.byType(BottomSheet)).dy, 600.0);
  });

  testWidgets('Verify that route settings can be set in the showModalBottomSheet', (WidgetTester tester) async {
    final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey<ScaffoldState>();
    const RouteSettings routeSettings = RouteSettings(name: 'route_name', arguments: 'route_argument');

    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        key: scaffoldKey,
        body: const Center(child: Text('body')),
      ),
    ));

    late RouteSettings retrievedRouteSettings;

    showModalBottomSheet<void>(
      context: scaffoldKey.currentContext!,
      routeSettings: routeSettings,
      builder: (BuildContext context) {
        retrievedRouteSettings = ModalRoute.of(context)!.settings;
        return const Text('BottomSheet');
      },
    );

    await tester.pump();
    await tester.pump(const Duration(seconds: 1));

    expect(retrievedRouteSettings, routeSettings);
  });

  testWidgets('Verify showModalBottomSheet use AnimationController if provided.', (WidgetTester tester) async {
    const Key tapTarget = Key('tap-target');
    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        body: Builder(
          builder: (BuildContext context) {
            return GestureDetector(
              key: tapTarget,
              onTap: () {
                showModalBottomSheet<void>(
                  context: context,
                  // The default duration and reverseDuration is 1 second
                  transitionAnimationController: AnimationController(
                    vsync: const TestVSync(),
                    duration: const Duration(seconds: 2),
                    reverseDuration: const Duration(seconds: 2),
                  ),
                  builder: (BuildContext context) {
                    return const Text('BottomSheet');
                  },
                );
              },
              behavior: HitTestBehavior.opaque,
              child: const SizedBox(
                height: 100.0,
                width: 100.0,
              ),
            );
          },
        ),
      ),
    ));

    expect(find.text('BottomSheet'), findsNothing);

    await tester.tap(find.byKey(tapTarget)); // Opening animation will start after tapping
    await tester.pump();

    expect(find.text('BottomSheet'), findsOneWidget);
    await tester.pump(const Duration(milliseconds: 2000));
    expect(find.text('BottomSheet'), findsOneWidget);

    // Tapping above the bottom sheet to dismiss it.
    await tester.tapAt(const Offset(20.0, 20.0)); // Closing animation will start after tapping
    await tester.pump();

    expect(find.text('BottomSheet'), findsOneWidget);
    await tester.pump(const Duration(milliseconds: 2000));
    // The bottom sheet should still be present at the very end of the animation.
    expect(find.text('BottomSheet'), findsOneWidget);

    await tester.pump(const Duration(milliseconds: 1));
    // The bottom sheet should not be showing any longer.
    expect(find.text('BottomSheet'), findsNothing);
  });

  // Regression test for https://github.com/flutter/flutter/issues/87592
  testWidgets('the framework do not dispose the transitionAnimationController provided by user.', (WidgetTester tester) async {
    const Key tapTarget = Key('tap-target');
    final AnimationController controller = AnimationController(
      vsync: const TestVSync(),
      duration: const Duration(seconds: 2),
      reverseDuration: const Duration(seconds: 2),
    );

    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        body: Builder(
          builder: (BuildContext context) {
            return GestureDetector(
              key: tapTarget,
              onTap: () {
                showModalBottomSheet<void>(
                  context: context,
                  // The default duration and reverseDuration is 1 second
                  transitionAnimationController: controller,
                  builder: (BuildContext context) {
                    return const Text('BottomSheet');
                  },
                );
              },
              behavior: HitTestBehavior.opaque,
              child: const SizedBox(
                height: 100.0,
                width: 100.0,
              ),
            );
          },
        ),
      ),
    ));

    expect(find.text('BottomSheet'), findsNothing);

    await tester.tap(find.byKey(tapTarget)); // Opening animation will start after tapping
    await tester.pump();

    expect(find.text('BottomSheet'), findsOneWidget);
    await tester.pump(const Duration(milliseconds: 2000));
    expect(find.text('BottomSheet'), findsOneWidget);

    // Tapping above the bottom sheet to dismiss it.
    await tester.tapAt(const Offset(20.0, 20.0)); // Closing animation will start after tapping
    await tester.pump();

    expect(find.text('BottomSheet'), findsOneWidget);
    await tester.pump(const Duration(milliseconds: 2000));
    // The bottom sheet should still be present at the very end of the animation.
    expect(find.text('BottomSheet'), findsOneWidget);

    await tester.pump(const Duration(milliseconds: 1));
    // The bottom sheet should not be showing any longer.
    expect(find.text('BottomSheet'), findsNothing);

    controller.dispose();
    // Double disposal will throw.
    expect(tester.takeException(), isNull);
  });

  testWidgets('Verify persistence BottomSheet use AnimationController if provided.', (WidgetTester tester) async {
    const Key tapTarget = Key('tap-target');
    const Key tapTargetToClose = Key('tap-target-to-close');
    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        body: Builder(
          builder: (BuildContext context) {
            return GestureDetector(
              key: tapTarget,
              onTap: () {
                showBottomSheet<void>(
                  context: context,
                  // The default duration and reverseDuration is 1 second
                  transitionAnimationController: AnimationController(
                    vsync: const TestVSync(),
                    duration: const Duration(seconds: 2),
                    reverseDuration: const Duration(seconds: 2),
                  ),
                  builder: (BuildContext context) {
                    return MaterialButton(
                      onPressed: () => Navigator.pop(context),
                      key: tapTargetToClose,
                      child: const Text('BottomSheet'),
                    );
                  },
                );
              },
              behavior: HitTestBehavior.opaque,
              child: const SizedBox(
                height: 100.0,
                width: 100.0,
              ),
            );
          },
        ),
      ),
    ));

    expect(find.text('BottomSheet'), findsNothing);

    await tester.tap(find.byKey(tapTarget)); // Opening animation will start after tapping
    await tester.pump();

    expect(find.text('BottomSheet'), findsOneWidget);
    await tester.pump(const Duration(milliseconds: 2000));
    expect(find.text('BottomSheet'), findsOneWidget);

    // Tapping button on the bottom sheet to dismiss it.
    await tester.tap(find.byKey(tapTargetToClose)); // Closing animation will start after tapping
    await tester.pump();

    expect(find.text('BottomSheet'), findsOneWidget);
    await tester.pump(const Duration(milliseconds: 2000));
    // The bottom sheet should still be present at the very end of the animation.
    expect(find.text('BottomSheet'), findsOneWidget);

    await tester.pump(const Duration(milliseconds: 1));
    // The bottom sheet should not be showing any longer.
    expect(find.text('BottomSheet'), findsNothing);
  });

  // Regression test for https://github.com/flutter/flutter/issues/87708
  testWidgets('Each of the internal animation controllers should be disposed by the framework.', (WidgetTester tester) async {
    final GlobalKey<ScaffoldState> scaffoldKey = GlobalKey();
    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        key: scaffoldKey,
        body: const Center(child: Text('body')),
      ),
    ));

    scaffoldKey.currentState!.showBottomSheet<void>((_) {
      return Builder(
        builder: (BuildContext context) {
          return Container(height: 200.0);
        },
      );
    });

    await tester.pump();
    expect(find.byType(BottomSheet), findsOneWidget);

    // The first sheet's animation is still running.

    // Trigger the second sheet will remove the first sheet from tree.
    scaffoldKey.currentState!.showBottomSheet<void>((_) {
      return Builder(
        builder: (BuildContext context) {
          return Container(height: 200.0);
        },
      );
    });
    await tester.pump();
    expect(find.byType(BottomSheet), findsOneWidget);

    // Remove the Scaffold from the tree.
    await tester.pumpWidget(const SizedBox.shrink());

    // If the internal animation controller do not dispose will throw
    // FlutterError:<ScaffoldState#1981a(tickers: tracking 1 ticker) was disposed with an active
    // Ticker.
    expect(tester.takeException(), isNull);
  });

  // Regression test for https://github.com/flutter/flutter/issues/87708
  testWidgets('The framework does not dispose of the transitionAnimationController provided by user.', (WidgetTester tester) async {
    const Key tapTarget = Key('tap-target');
    const Key tapTargetToClose = Key('tap-target-to-close');
    final AnimationController controller = AnimationController(
      vsync: const TestVSync(),
      duration: const Duration(seconds: 2),
      reverseDuration: const Duration(seconds: 2),
    );
    await tester.pumpWidget(MaterialApp(
      home: Scaffold(
        body: Builder(
          builder: (BuildContext context) {
            return GestureDetector(
              key: tapTarget,
              onTap: () {
                showBottomSheet<void>(
                  context: context,
                  transitionAnimationController: controller,
                  builder: (BuildContext context) {
                    return MaterialButton(
                      onPressed: () => Navigator.pop(context),
                      key: tapTargetToClose,
                      child: const Text('BottomSheet'),
                    );
                  },
                );
              },
              behavior: HitTestBehavior.opaque,
              child: const SizedBox(
                height: 100.0,
                width: 100.0,
              ),
            );
          },
        ),
      ),
    ));

    expect(find.text('BottomSheet'), findsNothing);

    await tester.tap(find.byKey(tapTarget)); // Open the sheet.
    await tester.pumpAndSettle(); // Finish the animation.
    expect(find.text('BottomSheet'), findsOneWidget);

    // Tapping button on the bottom sheet to dismiss it.
    await tester.tap(find.byKey(tapTargetToClose)); // Closing the sheet.
    await tester.pumpAndSettle(); // Finish the animation.
    expect(find.text('BottomSheet'), findsNothing);

    await tester.pumpWidget(const SizedBox.shrink());
    controller.dispose();

    // Double dispose will throw.
    expect(tester.takeException(), isNull);
  });

  group('constraints', () {

    testWidgets('No constraints by default for bottomSheet property', (WidgetTester tester) async {
      await tester.pumpWidget(const MaterialApp(
        home: Scaffold(
          body: Center(child: Text('body')),
          bottomSheet: Text('BottomSheet'),
        ),
      ));
      expect(find.text('BottomSheet'), findsOneWidget);
      expect(
        tester.getRect(find.text('BottomSheet')),
        const Rect.fromLTRB(0, 586, 154, 600),
      );
    });

    testWidgets('No constraints by default for showBottomSheet', (WidgetTester tester) async {
      await tester.pumpWidget(MaterialApp(
        home: Scaffold(
          body: Builder(builder: (BuildContext context) {
            return Center(
              child: ElevatedButton(
                child: const Text('Press me'),
                onPressed: () {
                  Scaffold.of(context).showBottomSheet<void>(
                    (BuildContext context) => const Text('BottomSheet'),
                  );
                },
              ),
            );
          }),
        ),
      ));
      expect(find.text('BottomSheet'), findsNothing);
      await tester.tap(find.text('Press me'));
      await tester.pumpAndSettle();
      expect(find.text('BottomSheet'), findsOneWidget);
      expect(
        tester.getRect(find.text('BottomSheet')),
        const Rect.fromLTRB(0, 586, 154, 600),
      );
    });

    testWidgets('No constraints by default for showModalBottomSheet', (WidgetTester tester) async {
      await tester.pumpWidget(MaterialApp(
        home: Scaffold(
          body: Builder(builder: (BuildContext context) {
            return Center(
              child: ElevatedButton(
                child: const Text('Press me'),
                onPressed: () {
                  showModalBottomSheet<void>(
                    context: context,
                    builder: (BuildContext context) => const Text('BottomSheet'),
                  );
                },
              ),
            );
          }),
        ),
      ));
      expect(find.text('BottomSheet'), findsNothing);
      await tester.tap(find.text('Press me'));
      await tester.pumpAndSettle();
      expect(find.text('BottomSheet'), findsOneWidget);
      expect(
        tester.getRect(find.text('BottomSheet')),
        const Rect.fromLTRB(0, 586, 800, 600),
      );
    });

    testWidgets('Theme constraints used for bottomSheet property', (WidgetTester tester) async {
      await tester.pumpWidget(MaterialApp(
        theme: ThemeData(
          bottomSheetTheme: const BottomSheetThemeData(
            constraints: BoxConstraints(maxWidth: 80),
          ),
        ),
        home: Scaffold(
          body: const Center(child: Text('body')),
          bottomSheet: const Text('BottomSheet'),
          floatingActionButton: FloatingActionButton(onPressed: () {}, child: const Icon(Icons.add)),
        ),
      ));
      expect(find.text('BottomSheet'), findsOneWidget);
      // Should be centered and only 80dp wide
      expect(
        tester.getRect(find.text('BottomSheet')),
        const Rect.fromLTRB(360, 558, 440, 600),
      );
      // Ensure the FAB is overlapping the top of the sheet
      expect(find.byIcon(Icons.add), findsOneWidget);
      expect(
        tester.getRect(find.byIcon(Icons.add)),
        const Rect.fromLTRB(744, 544, 768, 568),
      );
    });

    testWidgets('Theme constraints used for showBottomSheet', (WidgetTester tester) async {
      await tester.pumpWidget(MaterialApp(
        theme: ThemeData(
          bottomSheetTheme: const BottomSheetThemeData(
            constraints: BoxConstraints(maxWidth: 80),
          ),
        ),
        home: Scaffold(
          body: Builder(builder: (BuildContext context) {
            return Center(
              child: ElevatedButton(
                child: const Text('Press me'),
                onPressed: () {
                  Scaffold.of(context).showBottomSheet<void>(
                    (BuildContext context) => const Text('BottomSheet'),
                  );
                },
              ),
            );
          }),
        ),
      ));
      expect(find.text('BottomSheet'), findsNothing);
      await tester.tap(find.text('Press me'));
      await tester.pumpAndSettle();
      expect(find.text('BottomSheet'), findsOneWidget);
      // Should be centered and only 80dp wide
      expect(
        tester.getRect(find.text('BottomSheet')),
        const Rect.fromLTRB(360, 558, 440, 600),
      );
    });

    testWidgets('Theme constraints used for showModalBottomSheet', (WidgetTester tester) async {
      await tester.pumpWidget(MaterialApp(
        theme: ThemeData(
          bottomSheetTheme: const BottomSheetThemeData(
            constraints: BoxConstraints(maxWidth: 80),
          ),
        ),
        home: Scaffold(
          body: Builder(builder: (BuildContext context) {
            return Center(
              child: ElevatedButton(
                child: const Text('Press me'),
                onPressed: () {
                  showModalBottomSheet<void>(
                    context: context,
                    builder: (BuildContext context) => const Text('BottomSheet'),
                  );
                },
              ),
            );
          }),
        ),
      ));
      expect(find.text('BottomSheet'), findsNothing);
      await tester.tap(find.text('Press me'));
      await tester.pumpAndSettle();
      expect(find.text('BottomSheet'), findsOneWidget);
      // Should be centered and only 80dp wide
      expect(
        tester.getRect(find.text('BottomSheet')),
        const Rect.fromLTRB(360, 558, 440, 600),
      );
    });

    testWidgets('constraints param overrides theme for showBottomSheet', (WidgetTester tester) async {
      await tester.pumpWidget(MaterialApp(
        theme: ThemeData(
          bottomSheetTheme: const BottomSheetThemeData(
            constraints: BoxConstraints(maxWidth: 80),
          ),
        ),
        home: Scaffold(
          body: Builder(builder: (BuildContext context) {
            return Center(
              child: ElevatedButton(
                child: const Text('Press me'),
                onPressed: () {
                  Scaffold.of(context).showBottomSheet<void>(
                    (BuildContext context) => const Text('BottomSheet'),
                    constraints: const BoxConstraints(maxWidth: 100),
                  );
                },
              ),
            );
          }),
        ),
      ));
      expect(find.text('BottomSheet'), findsNothing);
      await tester.tap(find.text('Press me'));
      await tester.pumpAndSettle();
      expect(find.text('BottomSheet'), findsOneWidget);
      // Should be centered and only 100dp wide instead of 80dp wide
      expect(
        tester.getRect(find.text('BottomSheet')),
        const Rect.fromLTRB(350, 572, 450, 600),
      );
    });

    testWidgets('constraints param overrides theme for showModalBottomSheet', (WidgetTester tester) async {
      await tester.pumpWidget(MaterialApp(
        theme: ThemeData(
          bottomSheetTheme: const BottomSheetThemeData(
            constraints: BoxConstraints(maxWidth: 80),
          ),
        ),
        home: Scaffold(
          body: Builder(builder: (BuildContext context) {
            return Center(
              child: ElevatedButton(
                child: const Text('Press me'),
                onPressed: () {
                  showModalBottomSheet<void>(
                    context: context,
                    builder: (BuildContext context) => const Text('BottomSheet'),
                    constraints: const BoxConstraints(maxWidth: 100),
                  );
                },
              ),
            );
          }),
        ),
      ));
      expect(find.text('BottomSheet'), findsNothing);
      await tester.tap(find.text('Press me'));
      await tester.pumpAndSettle();
      expect(find.text('BottomSheet'), findsOneWidget);
      // Should be centered and only 100dp instead of 80dp wide
      expect(
        tester.getRect(find.text('BottomSheet')),
        const Rect.fromLTRB(350, 572, 450, 600),
      );
    });

  });
}

class _TestPage extends StatelessWidget {
  const _TestPage({Key? key, this.useRootNavigator}) : super(key: key);

  final bool? useRootNavigator;

  @override
  Widget build(BuildContext context) {
    return Center(
      child: TextButton(
        child: const Text('Show bottom sheet'),
        onPressed: () {
          if (useRootNavigator != null) {
            showModalBottomSheet<void>(
              useRootNavigator: useRootNavigator!,
              context: context,
              builder: (_) => const Text('Modal bottom sheet'),
            );
          } else {
            showModalBottomSheet<void>(
              context: context,
              builder: (_) => const Text('Modal bottom sheet'),
            );
          }
        },
      ),
    );
  }
}