// Copyright 2017 The Chromium 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/cupertino.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter/gestures.dart';

void main() {
  testWidgets('Switch can toggle on tap', (WidgetTester tester) async {
    final Key switchKey = UniqueKey();
    bool value = false;
    await tester.pumpWidget(
      Directionality(
        textDirection: TextDirection.ltr,
        child: StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            return Center(
              child: CupertinoSwitch(
                key: switchKey,
                value: value,
                dragStartBehavior: DragStartBehavior.down,
                onChanged: (bool newValue) {
                  setState(() {
                    value = newValue;
                  });
                },
              ),
            );
          },
        ),
      ),
    );

    expect(value, isFalse);
    await tester.tap(find.byKey(switchKey));
    expect(value, isTrue);
  });

  testWidgets('Switch can drag (LTR)', (WidgetTester tester) async {
    bool value = false;

    await tester.pumpWidget(
      Directionality(
        textDirection: TextDirection.ltr,
        child: StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            return Center(
              child: CupertinoSwitch(
                value: value,
                dragStartBehavior: DragStartBehavior.down,
                onChanged: (bool newValue) {
                  setState(() {
                    value = newValue;
                  });
                },
              ),
            );
          },
        ),
      ),
    );

    expect(value, isFalse);

    await tester.drag(find.byType(CupertinoSwitch), const Offset(-30.0, 0.0));

    expect(value, isFalse);

    await tester.drag(find.byType(CupertinoSwitch), const Offset(30.0, 0.0));

    expect(value, isTrue);

    await tester.pump();
    await tester.drag(find.byType(CupertinoSwitch), const Offset(30.0, 0.0));

    expect(value, isTrue);

    await tester.pump();
    await tester.drag(find.byType(CupertinoSwitch), const Offset(-30.0, 0.0));

    expect(value, isFalse);
  });

  testWidgets('Switch can drag with dragStartBehavior', (WidgetTester tester) async {
    bool value = false;

    await tester.pumpWidget(
      Directionality(
        textDirection: TextDirection.ltr,
        child: StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            return Center(
              child: CupertinoSwitch(
                value: value,
                dragStartBehavior: DragStartBehavior.down,
                onChanged: (bool newValue) {
                  setState(() {
                    value = newValue;
                  });
                },
              ),
            );
          },
        ),
      ),
    );

    expect(value, isFalse);
    await tester.drag(find.byType(CupertinoSwitch), const Offset(-30.0, 0.0));
    expect(value, isFalse);

    await tester.drag(find.byType(CupertinoSwitch), const Offset(30.0, 0.0));
    expect(value, isTrue);
    await tester.pump();
    await tester.drag(find.byType(CupertinoSwitch), const Offset(30.0, 0.0));
    expect(value, isTrue);
    await tester.pump();
    await tester.drag(find.byType(CupertinoSwitch), const Offset(-30.0, 0.0));
    expect(value, isFalse);

    await tester.pumpWidget(
      Directionality(
        textDirection: TextDirection.ltr,
        child: StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            return Center(
              child: CupertinoSwitch(
                value: value,
                dragStartBehavior: DragStartBehavior.start,
                onChanged: (bool newValue) {
                  setState(() {
                    value = newValue;
                  });
                },
              ),
            );
          },
        ),
      ),
    );
    await tester.pumpAndSettle();
    final Rect switchRect = tester.getRect(find.byType(CupertinoSwitch));

    TestGesture gesture = await tester.startGesture(switchRect.center);
    // We have to execute the drag in two frames because the first update will
    // just set the start position.
    await gesture.moveBy(const Offset(20.0, 0.0));
    await gesture.moveBy(const Offset(20.0, 0.0));
    expect(value, isTrue);
    await gesture.up();
    await tester.pump();

    gesture = await tester.startGesture(switchRect.center);
    await gesture.moveBy(const Offset(20.0, 0.0));
    await gesture.moveBy(const Offset(20.0, 0.0));
    expect(value, isTrue);
    await gesture.up();
    await tester.pump();

    gesture = await tester.startGesture(switchRect.center);
    await gesture.moveBy(const Offset(-20.0, 0.0));
    await gesture.moveBy(const Offset(-20.0, 0.0));
    expect(value, isFalse);
  });

  testWidgets('Switch can drag (RTL)', (WidgetTester tester) async {
    bool value = false;

    await tester.pumpWidget(
      Directionality(
        textDirection: TextDirection.rtl,
        child: StatefulBuilder(
          builder: (BuildContext context, StateSetter setState) {
            return Center(
              child: CupertinoSwitch(
                value: value,
                dragStartBehavior: DragStartBehavior.down,
                onChanged: (bool newValue) {
                  setState(() {
                    value = newValue;
                  });
                },
              ),
            );
          },
        ),
      ),
    );

    expect(value, isFalse);

    await tester.drag(find.byType(CupertinoSwitch), const Offset(30.0, 0.0));

    expect(value, isFalse);

    await tester.drag(find.byType(CupertinoSwitch), const Offset(-30.0, 0.0));

    expect(value, isTrue);

    await tester.pump();
    await tester.drag(find.byType(CupertinoSwitch), const Offset(-30.0, 0.0));

    expect(value, isTrue);

    await tester.pump();
    await tester.drag(find.byType(CupertinoSwitch), const Offset(30.0, 0.0));

    expect(value, isFalse);
  });

}
