// Copyright 2021 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// ignore_for_file: avoid_types_on_closure_parameters
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:material_3_demo/component_screen.dart';
import 'package:material_3_demo/main.dart';

void main() {
  testWidgets('Default main page shows all M3 components', (tester) async {
    widgetSetup(tester, 800, windowHeight: 3500);
    await tester.pumpWidget(const Material3Demo());

    // Elements on the app bar
    expect(find.text('Material 3'), findsOneWidget);
    expect(find.widgetWithIcon(IconButton, Icons.wb_sunny_outlined),
        findsOneWidget);
    expect(find.widgetWithIcon(IconButton, Icons.filter_3), findsOneWidget);
    expect(find.widgetWithIcon(IconButton, Icons.more_vert), findsOneWidget);

    // Elements on the component screen
    // Buttons
    expect(find.widgetWithText(ElevatedButton, 'Elevated'), findsNWidgets(2));
    expect(find.widgetWithText(FilledButton, 'Filled'), findsNWidgets(2));
    expect(find.widgetWithText(FilledButton, 'Filled Tonal'), findsNWidgets(2));
    expect(find.widgetWithText(OutlinedButton, 'Outlined'), findsNWidgets(2));
    expect(find.widgetWithText(TextButton, 'Text'), findsNWidgets(2));
    expect(find.text('Icon'), findsNWidgets(5));

    // IconButtons
    expect(find.byType(IconToggleButton), findsNWidgets(8));

    // FABs
    expect(find.byType(FloatingActionButton), findsNWidgets(4));
    expect(find.widgetWithText(FloatingActionButton, 'Create'), findsOneWidget);

    // Chips
    expect(find.byType(ActionChip),
        findsNWidgets(7)); // includes Assist and Suggestion chip.
    expect(find.byType(FilterChip), findsNWidgets(4));
    expect(find.byType(InputChip), findsNWidgets(4));

    // Cards
    expect(find.widgetWithText(Card, 'Filled'), findsOneWidget);
    expect(find.widgetWithText(Card, 'Filled'), findsOneWidget);
    expect(find.widgetWithText(Card, 'Outlined'), findsOneWidget);

    // TextFields
    expect(find.widgetWithText(TextField, 'Disabled'), findsNWidgets(2));
    expect(find.widgetWithText(TextField, 'Filled'), findsNWidgets(2));
    expect(find.widgetWithText(TextField, 'Outlined'), findsNWidgets(2));

    // Alert Dialog
    Finder dialogExample = find.widgetWithText(TextButton, 'Open Dialog');
    expect(dialogExample, findsOneWidget);

    // Switches
    Finder switchExample = find.byType(Switch);
    expect(switchExample, findsNWidgets(4));

    // Checkboxes
    Finder checkboxExample = find.byType(Checkbox);
    expect(checkboxExample, findsNWidgets(8));

    // Radios
    Finder radioExample = find.byType(Radio<Value>);
    expect(radioExample, findsNWidgets(2));

    // ProgressIndicator
    Finder circularProgressIndicator = find.byType(CircularProgressIndicator);
    expect(circularProgressIndicator, findsOneWidget);
    Finder linearProgressIndicator = find.byType(LinearProgressIndicator);
    expect(linearProgressIndicator, findsOneWidget);
  });

  testWidgets(
      'NavigationRail doesn\'t show when width value is small than 450 '
      '(in Portrait mode or narrow screen)', (tester) async {
    widgetSetup(tester, 449);
    await tester.pumpWidget(const Material3Demo());

    // When screen width is less than 450, NavigationBar will show. At the same
    // time, the NavigationRail and the NavigationBar example will NOT show.
    expect(find.byType(NavigationBars), findsOneWidget);
    expect(find.widgetWithText(NavigationBar, 'Components'), findsOneWidget);
    expect(find.widgetWithText(NavigationBar, 'Color'), findsOneWidget);
    expect(find.widgetWithText(NavigationBar, 'Typography'), findsOneWidget);
    expect(find.widgetWithText(NavigationBar, 'Elevation'), findsOneWidget);

    expect(find.byType(NavigationRailSection), findsNothing);
    expect(find.widgetWithText(NavigationBar, 'Explore'), findsNothing);
    expect(find.widgetWithText(NavigationBar, 'Pets'), findsNothing);
    expect(find.widgetWithText(NavigationBar, 'Account'), findsNothing);
  });

  testWidgets(
      'NavigationRail shows when width value is greater than or equal '
      'to 450 (in Landscape mode or wider screen)', (tester) async {
    widgetSetup(tester, 450);
    await tester.pumpWidget(const Material3Demo());

    // When screen width is greater than or equal to 450, NavigationRail and
    // NavigationBar example will show. At the same time, the NavigationBar
    // will NOT show.
    expect(find.byType(NavigationRailSection), findsOneWidget);
    expect(find.byType(Tooltip, skipOffstage: false), findsWidgets);
    expect(find.widgetWithText(NavigationRailSection, 'Components'),
        findsOneWidget);
    expect(find.widgetWithText(NavigationRailSection, 'Color'), findsOneWidget);
    expect(find.widgetWithText(NavigationRailSection, 'Typography'),
        findsOneWidget);
    expect(find.widgetWithText(NavigationRailSection, 'Elevation'),
        findsOneWidget);

    final navbarExample = find.byType(NavigationBars);
    await tester.scrollUntilVisible(
      scrollable: find.byType(Scrollable).first,
      navbarExample,
      500.0,
    );
    expect(find.byType(NavigationBars), findsOneWidget);
    expect(find.widgetWithText(NavigationBar, 'Explore'), findsOneWidget);
    expect(find.widgetWithText(NavigationBar, 'Pets'), findsOneWidget);
    expect(find.widgetWithText(NavigationBar, 'Account'), findsOneWidget);

    expect(find.widgetWithText(NavigationBar, 'Components'), findsNothing);
    expect(find.widgetWithText(NavigationBar, 'Colors'), findsNothing);
    expect(find.widgetWithText(NavigationBar, 'Typography'), findsNothing);
    expect(find.widgetWithText(NavigationBar, 'Elevation'), findsNothing);
  });

  testWidgets(
      'Material version switches between Material3 and Material2 when'
      'the version icon is clicked', (tester) async {
    widgetSetup(tester, 450, windowHeight: 3000);
    await tester.pumpWidget(const Material3Demo());
    Finder m3Icon = find.widgetWithIcon(IconButton, Icons.filter_3);
    Finder m2Icon = find.widgetWithIcon(IconButton, Icons.filter_2);
    BuildContext defaultElevatedButton =
        tester.firstElement(find.byType(ElevatedButton));
    BuildContext defaultIconButton =
        tester.firstElement(find.byType(IconButton));
    BuildContext defaultFAB =
        tester.firstElement(find.byType(FloatingActionButton));
    BuildContext defaultCard =
        tester.firstElement(find.widgetWithText(Card, 'Elevated'));
    BuildContext defaultChip =
        tester.firstElement(find.widgetWithText(ActionChip, 'Assist'));
    Finder dialog = find.text('Open Dialog');
    await tester.tap(dialog);
    await tester.pumpAndSettle(const Duration(microseconds: 500));
    BuildContext defaultAlertDialog = tester.element(find.byType(AlertDialog));
    expect(Theme.of(defaultAlertDialog).useMaterial3, true);
    Finder dismiss = find.text('Dismiss');
    await tester.tap(dismiss);
    await tester.pumpAndSettle(const Duration(microseconds: 500));

    expect(m3Icon, findsOneWidget);
    expect(m2Icon, findsNothing);
    expect(find.text('Material 3'), findsOneWidget);
    expect(Theme.of(defaultElevatedButton).useMaterial3, true);
    expect(Theme.of(defaultIconButton).useMaterial3, true);
    expect(Theme.of(defaultFAB).useMaterial3, true);
    expect(Theme.of(defaultCard).useMaterial3, true);
    expect(Theme.of(defaultChip).useMaterial3, true);

    await tester.tap(m3Icon);
    await tester.pumpAndSettle(const Duration(microseconds: 500));
    BuildContext updatedElevatedButton =
        tester.firstElement(find.byType(ElevatedButton));
    BuildContext updatedIconButton =
        tester.firstElement(find.byType(IconButton));
    BuildContext updatedFAB =
        tester.firstElement(find.byType(FloatingActionButton));
    BuildContext updatedCard = tester.firstElement(find.byType(Card));
    BuildContext updatedChip =
        tester.firstElement(find.widgetWithText(ActionChip, 'Assist'));
    Finder updatedDialog = find.text('Open Dialog');
    await tester.tap(updatedDialog);
    await tester.pumpAndSettle(const Duration(microseconds: 500));
    BuildContext updatedAlertDialog =
        tester.firstElement(find.byType(AlertDialog));
    expect(Theme.of(updatedAlertDialog).useMaterial3, false);
    Finder updatedDismiss = find.text('Dismiss');
    await tester.tap(updatedDismiss);
    await tester.pumpAndSettle(const Duration(microseconds: 500));

    expect(m3Icon, findsNothing);
    expect(m2Icon, findsOneWidget);
    expect(find.text('Material 2'), findsOneWidget);
    expect(Theme.of(updatedElevatedButton).useMaterial3, false);
    expect(Theme.of(updatedIconButton).useMaterial3, false);
    expect(Theme.of(updatedFAB).useMaterial3, false);
    expect(Theme.of(updatedCard).useMaterial3, false);
    expect(Theme.of(updatedChip).useMaterial3, false);
  });

  testWidgets(
      'Other screens become Material2 mode after changing mode from '
      'main screen', (tester) async {
    await tester.pumpWidget(const Material3Demo());
    await tester.tap(find.widgetWithIcon(IconButton, Icons.filter_3));
    await tester.tap(find.byIcon(Icons.format_paint_outlined));
    await tester.pumpAndSettle(const Duration(microseconds: 500));
    BuildContext lightThemeText = tester.element(find.text('Light Theme'));
    expect(Theme.of(lightThemeText).useMaterial3, false);
    await tester.tap(find.byIcon(Icons.text_snippet_outlined));
    await tester.pumpAndSettle(const Duration(microseconds: 500));
    BuildContext displayLargeText = tester.element(find.text('Display Large'));
    expect(Theme.of(displayLargeText).useMaterial3, false);
    await tester.tap(find.byIcon(Icons.invert_colors_on_outlined));
    await tester.pumpAndSettle(const Duration(microseconds: 500));
    BuildContext material = tester.firstElement(find.byType(Material));
    expect(Theme.of(material).useMaterial3, false);
  });

  testWidgets(
      'Brightness mode switches between dark and light when'
      'the brightness icon is clicked', (tester) async {
    await tester.pumpWidget(const Material3Demo());
    Finder lightIcon = find.widgetWithIcon(IconButton, Icons.wb_sunny_outlined);
    Finder darkIcon = find.widgetWithIcon(IconButton, Icons.wb_sunny);
    BuildContext appBar = tester.element(find.byType(AppBar));
    BuildContext body = tester.element(find.byType(Scaffold));
    BuildContext navigationRail = tester.element(find.byType(NavigationRail));
    expect(lightIcon, findsOneWidget);
    expect(darkIcon, findsNothing);
    expect(Theme.of(appBar).brightness, Brightness.light);
    expect(Theme.of(body).brightness, Brightness.light);
    expect(Theme.of(navigationRail).brightness, Brightness.light);
    await tester.tap(lightIcon);
    await tester.pumpAndSettle(const Duration(microseconds: 500));

    BuildContext appBar2 = tester.element(find.byType(AppBar));
    BuildContext body2 = tester.element(find.byType(Scaffold));
    BuildContext navigationRail2 = tester.element(find.byType(NavigationRail));
    expect(lightIcon, findsNothing);
    expect(darkIcon, findsOneWidget);
    expect(Theme.of(appBar2).brightness, Brightness.dark);
    expect(Theme.of(body2).brightness, Brightness.dark);
    expect(Theme.of(navigationRail2).brightness, Brightness.dark);
  });

  testWidgets('Color theme changes when a color is selected from menu',
      (tester) async {
    await tester.pumpWidget(const Material3Demo());
    Finder menuIcon = find.widgetWithIcon(IconButton, Icons.more_vert);
    BuildContext appBar = tester.element(find.byType(AppBar));
    BuildContext body = tester.element(find.byType(Scaffold));
    BuildContext navigationRail = tester.element(find.byType(NavigationRail));

    expect(Theme.of(appBar).primaryColor, m3BaseColor);
    expect(Theme.of(body).primaryColor, m3BaseColor);
    expect(Theme.of(navigationRail).primaryColor, m3BaseColor);
    await tester.tap(menuIcon);
    await tester.pumpAndSettle();
    await tester.tap(find.text('Blue'));
    await tester.pumpAndSettle();

    BuildContext appBar2 = tester.element(find.byType(AppBar));
    BuildContext body2 = tester.element(find.byType(Scaffold));
    BuildContext navigationRail2 = tester.element(find.byType(NavigationRail));
    ThemeData expectedTheme = ThemeData(colorSchemeSeed: Colors.blue);
    expect(Theme.of(appBar2).primaryColor, expectedTheme.primaryColor);
    expect(Theme.of(body2).primaryColor, expectedTheme.primaryColor);
    expect(Theme.of(navigationRail2).primaryColor, expectedTheme.primaryColor);
  });
}

void widgetSetup(WidgetTester tester, double windowWidth,
    {double? windowHeight}) {
  final height = windowHeight ?? 846;
  tester.binding.window.devicePixelRatioTestValue = (2);
  final dpi = tester.binding.window.devicePixelRatio;
  tester.binding.window.physicalSizeTestValue =
      Size(windowWidth * dpi, height * dpi);
}