// 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/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_api_samples/widgets/focus_manager/focus_node.0.dart'
    as example;
import 'package:flutter_test/flutter_test.dart';

void main() {
  testWidgets(
    'FocusNode gets focused and unfocused on ColorfulButton tap',
    (WidgetTester tester) async {
      await tester.pumpWidget(
        const example.FocusNodeExampleApp(),
      );

      final Element button = tester.element(
        find.byType(example.ColorfulButton),
      );

      expect(
        tester.binding.focusManager.primaryFocus?.context,
        isNot(equals(button)),
      );

      // Tapping on ColorfulButton to focus on FocusNode.
      await tester.tap(find.byType(example.ColorfulButton));
      await tester.pump();

      expect(
        tester.binding.focusManager.primaryFocus?.context,
        equals(button),
      );

      // Tapping on ColorfulButton to unfocus from FocusNode.
      await tester.tap(find.byType(example.ColorfulButton));
      await tester.pump();

      expect(
        tester.binding.focusManager.primaryFocus?.context,
        isNot(equals(button)),
      );
    },
  );

  testWidgets(
    'FocusNode updates the text label when focused or unfocused',
    (WidgetTester tester) async {
      await tester.pumpWidget(
        const example.FocusNodeExampleApp(),
      );

      expect(find.text('Press to focus'), findsOneWidget);
      expect(find.text("I'm in color! Press R,G,B!"), findsNothing);

      // Tapping on ColorfulButton to focus on FocusNode.
      await tester.tap(find.byType(example.ColorfulButton));
      await tester.pump();

      expect(find.text('Press to focus'), findsNothing);
      expect(find.text("I'm in color! Press R,G,B!"), findsOneWidget);

      // Tapping on ColorfulButton to unfocus from FocusNode.
      await tester.tap(find.byType(example.ColorfulButton));
      await tester.pump();

      expect(find.text('Press to focus'), findsOneWidget);
      expect(find.text("I'm in color! Press R,G,B!"), findsNothing);
    },
  );

  testWidgets(
    'FocusNode updates color of the Container according to the key events when focused',
    (WidgetTester tester) async {
      await tester.pumpWidget(
        const example.FocusNodeExampleApp(),
      );

      // Tapping on ColorfulButton to focus on FocusNode.
      await tester.tap(find.byType(example.ColorfulButton));
      await tester.pump();

      final Finder containerFinder = find.descendant(
        of: find.byType(example.ColorfulButton),
        matching: find.byType(Container),
      );

      Container container = tester.widget<Container>(containerFinder);
      expect(container.color, equals(Colors.white));

      await tester.sendKeyEvent(LogicalKeyboardKey.keyR);
      await tester.pump();

      container = tester.widget<Container>(containerFinder);
      expect(container.color, equals(Colors.red));

      await tester.sendKeyEvent(LogicalKeyboardKey.keyG);
      await tester.pump();

      container = tester.widget<Container>(containerFinder);
      expect(container.color, equals(Colors.green));

      await tester.sendKeyEvent(LogicalKeyboardKey.keyB);
      await tester.pump();

      container = tester.widget<Container>(containerFinder);
      expect(container.color, equals(Colors.blue));
    },
  );

  testWidgets(
    'FocusNode does not listen to the key events when unfocused',
    (WidgetTester tester) async {
      await tester.pumpWidget(
        const example.FocusNodeExampleApp(),
      );

      final Finder containerFinder = find.descendant(
        of: find.byType(example.ColorfulButton),
        matching: find.byType(Container),
      );

      Container container = tester.widget<Container>(containerFinder);
      expect(container.color, equals(Colors.white));

      await tester.sendKeyEvent(LogicalKeyboardKey.keyR);
      await tester.pump();

      container = tester.widget<Container>(containerFinder);
      expect(container.color, equals(Colors.white));

      await tester.sendKeyEvent(LogicalKeyboardKey.keyG);
      await tester.pump();

      container = tester.widget<Container>(containerFinder);
      expect(container.color, equals(Colors.white));

      await tester.sendKeyEvent(LogicalKeyboardKey.keyB);
      await tester.pump();

      container = tester.widget<Container>(containerFinder);
      expect(container.color, equals(Colors.white));
    },
  );

  testWidgets(
    'FocusNode sets color to the white when unfocused and sets it back to the selected one when focused',
    (WidgetTester tester) async {
      await tester.pumpWidget(
        const example.FocusNodeExampleApp(),
      );

      final Finder containerFinder = find.descendant(
        of: find.byType(example.ColorfulButton),
        matching: find.byType(Container),
      );

      Container container = tester.widget<Container>(containerFinder);
      expect(container.color, equals(Colors.white));

      // Tapping on ColorfulButton to focus on FocusNode.
      await tester.tap(find.byType(example.ColorfulButton));
      await tester.pump();

      container = tester.widget<Container>(containerFinder);
      expect(container.color, equals(Colors.white));

      await tester.sendKeyEvent(LogicalKeyboardKey.keyR);
      await tester.pump();

      container = tester.widget<Container>(containerFinder);
      expect(container.color, equals(Colors.red));

      // Tapping on ColorfulButton to unfocus from FocusNode.
      await tester.tap(find.byType(example.ColorfulButton));
      await tester.pump();

      container = tester.widget<Container>(containerFinder);
      expect(container.color, equals(Colors.white));

      // Tapping on ColorfulButton to focus on FocusNode.
      await tester.tap(find.byType(example.ColorfulButton));
      await tester.pump();

      container = tester.widget<Container>(containerFinder);
      expect(container.color, equals(Colors.red));
    },
  );
}