// 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 'dart:ui';

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

void main() {
  // Regression test for https://github.com/flutter/flutter/issues/87099
  testWidgets('TextField.autofocus should skip the element that never layout', (WidgetTester tester) async {
    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          body: Navigator(
            pages: const <Page<void>>[_APage(), _BPage()],
            onPopPage: (Route<dynamic> route, dynamic result) {
              return false;
            },
          ),
        ),
      ),
    );

    expect(tester.takeException(), isNull);
  });

  testWidgets('Dialog interaction', (WidgetTester tester) async {
    expect(tester.testTextInput.isVisible, isFalse);

    final FocusNode focusNode = FocusNode(debugLabel: 'Editable Text Node');

    await tester.pumpWidget(
      MaterialApp(
        home: Material(
          child: Center(
            child: TextField(
              focusNode: focusNode,
              autofocus: true,
            ),
          ),
        ),
      ),
    );

    expect(tester.testTextInput.isVisible, isTrue);
    expect(focusNode.hasPrimaryFocus, isTrue);

    final BuildContext context = tester.element(find.byType(TextField));

    showDialog<void>(
      context: context,
      builder: (BuildContext context) => const SimpleDialog(title: Text('Dialog')),
    );

    await tester.pump();

    expect(tester.testTextInput.isVisible, isFalse);

    Navigator.of(tester.element(find.text('Dialog'))).pop();
    await tester.pump();

    expect(focusNode.hasPrimaryFocus, isTrue);
    expect(tester.testTextInput.isVisible, isTrue);

    await tester.pumpWidget(Container());

    expect(tester.testTextInput.isVisible, isFalse);
  });

  testWidgets('Request focus shows keyboard', (WidgetTester tester) async {
    final FocusNode focusNode = FocusNode();

    await tester.pumpWidget(
      MaterialApp(
        home: Material(
          child: Center(
            child: TextField(
              focusNode: focusNode,
            ),
          ),
        ),
      ),
    );

    expect(tester.testTextInput.isVisible, isFalse);

    FocusScope.of(tester.element(find.byType(TextField))).requestFocus(focusNode);
    await tester.idle();

    expect(tester.testTextInput.isVisible, isTrue);

    await tester.pumpWidget(Container());

    expect(tester.testTextInput.isVisible, isFalse);
  });

  testWidgets('Autofocus shows keyboard', (WidgetTester tester) async {
    expect(tester.testTextInput.isVisible, isFalse);

    await tester.pumpWidget(
      const MaterialApp(
        home: Material(
          child: Center(
            child: TextField(
              autofocus: true,
            ),
          ),
        ),
      ),
    );

    expect(tester.testTextInput.isVisible, isTrue);

    await tester.pumpWidget(Container());

    expect(tester.testTextInput.isVisible, isFalse);
  });

  testWidgets('Tap shows keyboard', (WidgetTester tester) async {
    expect(tester.testTextInput.isVisible, isFalse);

    await tester.pumpWidget(
      const MaterialApp(
        home: Material(
          child: Center(
            child: TextField(),
          ),
        ),
      ),
    );

    expect(tester.testTextInput.isVisible, isFalse);

    await tester.tap(find.byType(TextField));
    await tester.idle();

    expect(tester.testTextInput.isVisible, isTrue);
    // Prevent the gesture recognizer from recognizing the next tap as a
    // double-tap.
    await tester.pump(const Duration(seconds: 1));

    tester.testTextInput.hide();
    final EditableTextState state = tester.state<EditableTextState>(find.byType(EditableText));
    state.connectionClosed();

    expect(tester.testTextInput.isVisible, isFalse);

    await tester.tap(find.byType(TextField));
    await tester.idle();

    expect(tester.testTextInput.isVisible, isTrue);

    await tester.pumpWidget(Container());

    expect(tester.testTextInput.isVisible, isFalse);
  });

  testWidgets('Focus triggers keep-alive', (WidgetTester tester) async {
    final FocusNode focusNode = FocusNode();

    await tester.pumpWidget(
      MaterialApp(
        home: Material(
          child: ListView(
            children: <Widget>[
              TextField(
                focusNode: focusNode,
              ),
              Container(
                height: 1000.0,
              ),
            ],
          ),
        ),
      ),
    );

    expect(find.byType(TextField), findsOneWidget);
    expect(tester.testTextInput.isVisible, isFalse);

    FocusScope.of(tester.element(find.byType(TextField))).requestFocus(focusNode);
    await tester.pump();
    expect(find.byType(TextField), findsOneWidget);
    expect(tester.testTextInput.isVisible, isTrue);

    await tester.drag(find.byType(TextField), const Offset(0.0, -1000.0));
    await tester.pump();
    expect(find.byType(TextField, skipOffstage: false), findsOneWidget);
    expect(tester.testTextInput.isVisible, isTrue);

    focusNode.unfocus();
    await tester.pump();

    expect(find.byType(TextField), findsNothing);
    expect(tester.testTextInput.isVisible, isFalse);
  });

  testWidgets('Focus keep-alive works with GlobalKey reparenting', (WidgetTester tester) async {
    final FocusNode focusNode = FocusNode();

    Widget makeTest(String? prefix) {
      return MaterialApp(
        home: Material(
          child: ListView(
            children: <Widget>[
              TextField(
                focusNode: focusNode,
                decoration: InputDecoration(
                  prefixText: prefix,
                ),
              ),
              Container(
                height: 1000.0,
              ),
            ],
          ),
        ),
      );
    }

    await tester.pumpWidget(makeTest(null));
    FocusScope.of(tester.element(find.byType(TextField))).requestFocus(focusNode);
    await tester.pump();
    expect(find.byType(TextField), findsOneWidget);
    await tester.drag(find.byType(TextField), const Offset(0.0, -1000.0));
    await tester.pump();
    expect(find.byType(TextField, skipOffstage: false), findsOneWidget);
    await tester.pumpWidget(makeTest('test'));
    await tester.pump(); // in case the AutomaticKeepAlive widget thinks it needs a cleanup frame
    expect(find.byType(TextField, skipOffstage: false), findsOneWidget);
  });

  testWidgets('TextField with decoration:null', (WidgetTester tester) async {
    // Regression test for https://github.com/flutter/flutter/issues/16880

    await tester.pumpWidget(
      const MaterialApp(
        home: Material(
          child: Center(
            child: TextField(
              decoration: null,
            ),
          ),
        ),
      ),
    );

    expect(tester.testTextInput.isVisible, isFalse);
    await tester.tap(find.byType(TextField));
    await tester.idle();
    expect(tester.testTextInput.isVisible, isTrue);
  });

  testWidgets('Sibling FocusScopes', (WidgetTester tester) async {
    expect(tester.testTextInput.isVisible, isFalse);

    final FocusScopeNode focusScopeNode0 = FocusScopeNode();
    final FocusScopeNode focusScopeNode1 = FocusScopeNode();
    final Key textField0 = UniqueKey();
    final Key textField1 = UniqueKey();

    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          body: Center(
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: <Widget>[
                FocusScope(
                  node: focusScopeNode0,
                  child: Builder(
                    builder: (BuildContext context) => TextField(key: textField0),
                  ),
                ),
                FocusScope(
                  node: focusScopeNode1,
                  child: Builder(
                    builder: (BuildContext context) => TextField(key: textField1),
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );

    expect(tester.testTextInput.isVisible, isFalse);

    await tester.tap(find.byKey(textField0));
    await tester.idle();
    expect(tester.testTextInput.isVisible, isTrue);

    tester.testTextInput.hide();
    expect(tester.testTextInput.isVisible, isFalse);

    await tester.tap(find.byKey(textField1));
    await tester.idle();
    expect(tester.testTextInput.isVisible, isTrue);

    await tester.tap(find.byKey(textField0));
    await tester.idle();
    expect(tester.testTextInput.isVisible, isTrue);

    await tester.tap(find.byKey(textField1));
    await tester.idle();
    expect(tester.testTextInput.isVisible, isTrue);

    tester.testTextInput.hide();
    expect(tester.testTextInput.isVisible, isFalse);

    await tester.tap(find.byKey(textField0));
    await tester.idle();
    expect(tester.testTextInput.isVisible, isTrue);

    await tester.pumpWidget(Container());
    expect(tester.testTextInput.isVisible, isFalse);
  });

  testWidgets('Sibling Navigators', (WidgetTester tester) async {
    expect(tester.testTextInput.isVisible, isFalse);

    final Key textField0 = UniqueKey();
    final Key textField1 = UniqueKey();

    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          body: Center(
            child: Column(
              children: <Widget>[
                Expanded(
                  child: Navigator(
                    onGenerateRoute: (RouteSettings settings) {
                      return MaterialPageRoute<void>(
                        builder: (BuildContext context) {
                          return TextField(key: textField0);
                        },
                        settings: settings,
                      );
                    },
                  ),
                ),
                Expanded(
                  child: Navigator(
                    onGenerateRoute: (RouteSettings settings) {
                      return MaterialPageRoute<void>(
                        builder: (BuildContext context) {
                          return TextField(key: textField1);
                        },
                        settings: settings,
                      );
                    },
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );

    expect(tester.testTextInput.isVisible, isFalse);

    await tester.tap(find.byKey(textField0));
    await tester.idle();
    expect(tester.testTextInput.isVisible, isTrue);

    tester.testTextInput.hide();
    expect(tester.testTextInput.isVisible, isFalse);

    await tester.tap(find.byKey(textField1));
    await tester.idle();
    expect(tester.testTextInput.isVisible, isTrue);

    await tester.tap(find.byKey(textField0));
    await tester.idle();
    expect(tester.testTextInput.isVisible, isTrue);

    await tester.tap(find.byKey(textField1));
    await tester.idle();
    expect(tester.testTextInput.isVisible, isTrue);

    tester.testTextInput.hide();
    expect(tester.testTextInput.isVisible, isFalse);

    await tester.tap(find.byKey(textField0));
    await tester.idle();
    expect(tester.testTextInput.isVisible, isTrue);

    await tester.pumpWidget(Container());
    expect(tester.testTextInput.isVisible, isFalse);
  });

  testWidgets('A Focused text-field will lose focus when clicking outside of its hitbox with a mouse on desktop', (WidgetTester tester) async {
    final FocusNode focusNodeA = FocusNode();
    final FocusNode focusNodeB = FocusNode();
    final Key key = UniqueKey();

    await tester.pumpWidget(
      MaterialApp(
        home: Material(
          child: ListView(
            children: <Widget>[
              TextField(
                focusNode: focusNodeA,
              ),
              Container(
                key: key,
                height: 200,
              ),
              TextField(
                focusNode: focusNodeB,
              ),
            ],
          ),
        ),
      ),
    );

    final TestGesture down1 = await tester.startGesture(tester.getCenter(find.byType(TextField).first), kind: PointerDeviceKind.mouse);
    await tester.pump();
    await tester.pumpAndSettle();
    await down1.up();
    await down1.removePointer();

    expect(focusNodeA.hasFocus, true);
    expect(focusNodeB.hasFocus, false);

    // Click on the container to not hit either text field.
    final TestGesture down2 = await tester.startGesture(tester.getCenter(find.byKey(key)), kind: PointerDeviceKind.mouse);
    await tester.pump();
    await tester.pumpAndSettle();
    await down2.up();
    await down2.removePointer();

    expect(focusNodeA.hasFocus, false);
    expect(focusNodeB.hasFocus, false);

    // Second text field can still gain focus.

    final TestGesture down3 = await tester.startGesture(tester.getCenter(find.byType(TextField).last), kind: PointerDeviceKind.mouse);
    await tester.pump();
    await tester.pumpAndSettle();
    await down3.up();
    await down3.removePointer();

    expect(focusNodeA.hasFocus, false);
    expect(focusNodeB.hasFocus, true);
  }, variant: TargetPlatformVariant.desktop());

  testWidgets('A Focused text-field will not lose focus when clicking on its decoration', (WidgetTester tester) async {
    final FocusNode focusNodeA = FocusNode();
    final Key iconKey = UniqueKey();

    await tester.pumpWidget(
      MaterialApp(
        home: Material(
          child: ListView(
            children: <Widget>[
              TextField(
                focusNode: focusNodeA,
                decoration: InputDecoration(
                  icon: Icon(Icons.copy_all, key: iconKey),
                ),
              ),
            ],
          ),
        ),
      ),
    );

    final TestGesture down1 = await tester.startGesture(tester.getCenter(find.byType(TextField).first), kind: PointerDeviceKind.mouse);
    await tester.pump();
    await down1.removePointer();

    expect(focusNodeA.hasFocus, true);

    // Click on the icon which has a different RO than the text field's focus node context
    final TestGesture down2 = await tester.startGesture(tester.getCenter(find.byKey(iconKey)), kind: PointerDeviceKind.mouse);
    await tester.pump();
    await tester.pumpAndSettle();
    await down2.up();
    await down2.removePointer();

    expect(focusNodeA.hasFocus, true);
  }, variant: TargetPlatformVariant.desktop());

  testWidgets('A Focused text-field will lose focus when clicking outside of its hitbox with a mouse on desktop after tab navigation', (WidgetTester tester) async {
    final FocusNode focusNodeA = FocusNode(debugLabel: 'A');
    final FocusNode focusNodeB = FocusNode(debugLabel: 'B');
    final Key key = UniqueKey();

    await tester.pumpWidget(
      MaterialApp(
        home: Material(
          child: ListView(
            children: <Widget>[
              const TextField(),
              const TextField(),
              TextField(
                focusNode: focusNodeA,
              ),
              Container(
                key: key,
                height: 200,
              ),
              TextField(
                focusNode: focusNodeB,
              ),
            ],
          ),
        ),
      ),
    );
    // Tab over to the 3rd text field.
    for (int i = 0; i < 3; i += 1) {
      await tester.sendKeyEvent(LogicalKeyboardKey.tab);
      await tester.pump();
    }

    Future<void> click(Finder finder) async {
      final TestGesture gesture = await tester.startGesture(
        tester.getCenter(finder),
        kind: PointerDeviceKind.mouse,
      );
      await gesture.up();
      await gesture.removePointer();
    }

    expect(focusNodeA.hasFocus, true);
    expect(focusNodeB.hasFocus, false);

    // Click on the container to not hit either text field.
    await click(find.byKey(key));
    await tester.pump();

    expect(focusNodeA.hasFocus, false);
    expect(focusNodeB.hasFocus, false);

    // Second text field can still gain focus.

    await click(find.byType(TextField).last);
    await tester.pump();

    expect(focusNodeA.hasFocus, false);
    expect(focusNodeB.hasFocus, true);
  }, variant: TargetPlatformVariant.desktop());
}

class _APage extends Page<void> {
  const _APage();

  @override
  Route<void> createRoute(BuildContext context) => PageRouteBuilder<void>(
    settings: this,
    pageBuilder: (_, __, ___) => const TextField(autofocus: true),
  );
}

class _BPage extends Page<void> {
  const _BPage();

  @override
  Route<void> createRoute(BuildContext context) => PageRouteBuilder<void>(
    settings: this,
    pageBuilder: (_, __, ___) => const Text('B'),
  );
}