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

void main() {
  RenderObject getOverlayColor(WidgetTester tester) {
    return tester.allRenderObjects.firstWhere((RenderObject object) => object.runtimeType.toString() == '_RenderInkFeatures');
  }

  test('IconButtonThemeData lerp special cases', () {
    expect(IconButtonThemeData.lerp(null, null, 0), null);
    const IconButtonThemeData data = IconButtonThemeData();
    expect(identical(IconButtonThemeData.lerp(data, data, 0.5), data), true);
  });

  testWidgets('Passing no IconButtonTheme returns defaults', (WidgetTester tester) async {
    const ColorScheme colorScheme = ColorScheme.light();
    await tester.pumpWidget(
      MaterialApp(
        theme: ThemeData.from(colorScheme: colorScheme, useMaterial3: true),
        home: Scaffold(
          body: Center(
            child: IconButton(
              onPressed: () { },
              icon: const Icon(Icons.ac_unit),
            ),
          ),
        ),
      ),
    );

    final Finder buttonMaterial = find.descendant(
      of: find.byType(IconButton),
      matching: find.byType(Material),
    );

    final Material material = tester.widget<Material>(buttonMaterial);
    expect(material.animationDuration, const Duration(milliseconds: 200));
    expect(material.borderRadius, null);
    expect(material.color, Colors.transparent);
    expect(material.elevation, 0.0);
    expect(material.shadowColor, Colors.transparent);
    expect(material.shape, const StadiumBorder());
    expect(material.textStyle, null);
    expect(material.type, MaterialType.button);

    final Align align = tester.firstWidget<Align>(find.ancestor(of: find.byIcon(Icons.ac_unit), matching: find.byType(Align)));
    expect(align.alignment, Alignment.center);
  });

  group('[Theme, IconTheme, IconButton style overrides]', () {
    const Color foregroundColor = Color(0xff000001);
    const Color disabledForegroundColor = Color(0xff000002);
    const Color backgroundColor = Color(0xff000003);
    const Color shadowColor = Color(0xff000004);
    const double elevation = 3;
    const EdgeInsets padding = EdgeInsets.all(3);
    const Size minimumSize = Size(200, 200);
    const BorderSide side = BorderSide(color: Colors.green, width: 2);
    const OutlinedBorder shape = RoundedRectangleBorder(side: side, borderRadius: BorderRadius.all(Radius.circular(2)));
    const MouseCursor enabledMouseCursor = SystemMouseCursors.text;
    const MouseCursor disabledMouseCursor = SystemMouseCursors.grab;
    const MaterialTapTargetSize tapTargetSize = MaterialTapTargetSize.shrinkWrap;
    const Duration animationDuration = Duration(milliseconds: 25);
    const bool enableFeedback = false;
    const AlignmentGeometry alignment = Alignment.centerLeft;

    final ButtonStyle style = IconButton.styleFrom(
      foregroundColor: foregroundColor,
      disabledForegroundColor: disabledForegroundColor,
      backgroundColor: backgroundColor,
      shadowColor: shadowColor,
      elevation: elevation,
      padding: padding,
      minimumSize: minimumSize,
      side: side,
      shape: shape,
      enabledMouseCursor: enabledMouseCursor,
      disabledMouseCursor: disabledMouseCursor,
      tapTargetSize: tapTargetSize,
      animationDuration: animationDuration,
      enableFeedback: enableFeedback,
      alignment: alignment,
    );

    Widget buildFrame({ ButtonStyle? buttonStyle, ButtonStyle? themeStyle, ButtonStyle? overallStyle }) {
      final Widget child = Builder(
        builder: (BuildContext context) {
          return IconButton(
            style: buttonStyle,
            onPressed: () { },
            icon: const Icon(Icons.ac_unit),
          );
        },
      );
      return MaterialApp(
        theme: ThemeData.from(colorScheme: const ColorScheme.light(), useMaterial3: true).copyWith(
          iconButtonTheme: IconButtonThemeData(style: overallStyle),
        ),
        home: Scaffold(
          body: Center(
            // If the IconButtonTheme widget is present, it's used
            // instead of the Theme's ThemeData.iconButtonTheme.
            child: themeStyle == null ? child : IconButtonTheme(
              data: IconButtonThemeData(style: themeStyle),
              child: child,
            ),
          ),
        ),
      );
    }

    final Finder findMaterial = find.descendant(
      of: find.byType(IconButton),
      matching: find.byType(Material),
    );

    final Finder findInkWell = find.descendant(
      of: find.byType(IconButton),
      matching: find.byType(InkWell),
    );

    const Set<MaterialState> enabled = <MaterialState>{};
    const Set<MaterialState> disabled = <MaterialState>{ MaterialState.disabled };
    const Set<MaterialState> hovered = <MaterialState>{ MaterialState.hovered };
    const Set<MaterialState> focused = <MaterialState>{ MaterialState.focused };
    const Set<MaterialState> pressed = <MaterialState>{ MaterialState.pressed };

    void checkButton(WidgetTester tester) {
      final Material material = tester.widget<Material>(findMaterial);
      final InkWell inkWell = tester.widget<InkWell>(findInkWell);
      expect(material.textStyle, null);
      expect(material.color, backgroundColor);
      expect(material.shadowColor, shadowColor);
      expect(material.elevation, elevation);
      expect(MaterialStateProperty.resolveAs<MouseCursor?>(inkWell.mouseCursor, enabled), enabledMouseCursor);
      expect(MaterialStateProperty.resolveAs<MouseCursor?>(inkWell.mouseCursor, disabled), disabledMouseCursor);
      expect(inkWell.overlayColor!.resolve(hovered), foregroundColor.withOpacity(0.08));
      expect(inkWell.overlayColor!.resolve(focused), foregroundColor.withOpacity(0.1));
      expect(inkWell.overlayColor!.resolve(pressed), foregroundColor.withOpacity(0.1));
      expect(inkWell.enableFeedback, enableFeedback);
      expect(material.borderRadius, null);
      expect(material.shape, shape);
      expect(material.animationDuration, animationDuration);
      expect(tester.getSize(find.byType(IconButton)), const Size(200, 200));
      final Align align = tester.firstWidget<Align>(find.ancestor(of: find.byIcon(Icons.ac_unit), matching: find.byType(Align)));
      expect(align.alignment, alignment);
    }

    testWidgets('Button style overrides defaults', (WidgetTester tester) async {
      await tester.pumpWidget(buildFrame(buttonStyle: style));
      await tester.pumpAndSettle(); // allow the animations to finish
      checkButton(tester);
    });

    testWidgets('Button theme style overrides defaults', (WidgetTester tester) async {
      await tester.pumpWidget(buildFrame(themeStyle: style));
      await tester.pumpAndSettle();
      checkButton(tester);
    });

    testWidgets('Overall Theme button theme style overrides defaults', (WidgetTester tester) async {
      await tester.pumpWidget(buildFrame(overallStyle: style));
      await tester.pumpAndSettle();
      checkButton(tester);
    });

    // Same as the previous tests with empty ButtonStyle's instead of null.

    testWidgets('Button style overrides defaults, empty theme and overall styles', (WidgetTester tester) async {
      await tester.pumpWidget(buildFrame(buttonStyle: style, themeStyle: const ButtonStyle(), overallStyle: const ButtonStyle()));
      await tester.pumpAndSettle(); // allow the animations to finish
      checkButton(tester);
    });

    testWidgets('Button theme style overrides defaults, empty button and overall styles', (WidgetTester tester) async {
      await tester.pumpWidget(buildFrame(buttonStyle: const ButtonStyle(), themeStyle: style, overallStyle: const ButtonStyle()));
      await tester.pumpAndSettle(); // allow the animations to finish
      checkButton(tester);
    });

    testWidgets('Overall Theme button theme style overrides defaults, null theme and empty overall style', (WidgetTester tester) async {
      await tester.pumpWidget(buildFrame(buttonStyle: const ButtonStyle(), overallStyle: style));
      await tester.pumpAndSettle(); // allow the animations to finish
      checkButton(tester);
    });
  });

  testWidgets('Theme shadowColor', (WidgetTester tester) async {
    const ColorScheme colorScheme = ColorScheme.light();
    const Color shadowColor = Color(0xff000001);
    const Color overriddenColor = Color(0xff000002);

    Widget buildFrame({ Color? overallShadowColor, Color? themeShadowColor, Color? shadowColor }) {
      return MaterialApp(
        theme: ThemeData.from(colorScheme: colorScheme, useMaterial3: true).copyWith(
          shadowColor: overallShadowColor,
        ),
        home: Scaffold(
          body: Center(
            child: IconButtonTheme(
              data: IconButtonThemeData(
                style: IconButton.styleFrom(
                  shadowColor: themeShadowColor,
                ),
              ),
              child: Builder(
                builder: (BuildContext context) {
                  return IconButton(
                    style: IconButton.styleFrom(
                      shadowColor: shadowColor,
                    ),
                    onPressed: () { },
                    icon: const Icon(Icons.add),
                  );
                },
              ),
            ),
          ),
        ),
      );
    }

    final Finder buttonMaterialFinder = find.descendant(
      of: find.byType(IconButton),
      matching: find.byType(Material),
    );

    await tester.pumpWidget(buildFrame());
    Material material = tester.widget<Material>(buttonMaterialFinder);
    expect(material.shadowColor, Colors.transparent); //default

    await tester.pumpWidget(buildFrame(overallShadowColor: shadowColor));
    await tester.pumpAndSettle(); // theme animation
    material = tester.widget<Material>(buttonMaterialFinder);
    expect(material.shadowColor, Colors.transparent);

    await tester.pumpWidget(buildFrame(themeShadowColor: shadowColor));
    await tester.pumpAndSettle(); // theme animation
    material = tester.widget<Material>(buttonMaterialFinder);
    expect(material.shadowColor, shadowColor);

    await tester.pumpWidget(buildFrame(shadowColor: shadowColor));
    await tester.pumpAndSettle(); // theme animation
    material = tester.widget<Material>(buttonMaterialFinder);
    expect(material.shadowColor, shadowColor);

    await tester.pumpWidget(buildFrame(overallShadowColor: overriddenColor, themeShadowColor: shadowColor));
    await tester.pumpAndSettle(); // theme animation
    material = tester.widget<Material>(buttonMaterialFinder);
    expect(material.shadowColor, shadowColor);

    await tester.pumpWidget(buildFrame(themeShadowColor: overriddenColor, shadowColor: shadowColor));
    await tester.pumpAndSettle(); // theme animation
    material = tester.widget<Material>(buttonMaterialFinder);
    expect(material.shadowColor, shadowColor);
  });

  testWidgets('IconButtonTheme IconButton.styleFrom overlayColor overrides default overlay color', (WidgetTester tester) async {
    const Color overlayColor = Color(0xffff0000);
    await tester.pumpWidget(
      MaterialApp(
        home: Scaffold(
          body: Center(
            child: IconButtonTheme(
              data: IconButtonThemeData(
                style: IconButton.styleFrom(
                  overlayColor: overlayColor,
                ),
              ),
              child: IconButton(
                onPressed: () { },
                icon: const Icon(Icons.add),
              ),
            ),
          ),
        ),
      ),
    );

    // Hovered.
    final Offset center = tester.getCenter(find.byType(IconButton));
    final TestGesture gesture = await tester.createGesture(
      kind: PointerDeviceKind.mouse,
    );
    await gesture.addPointer();
    await gesture.moveTo(center);
    await tester.pumpAndSettle();
    expect(getOverlayColor(tester), paints..rect(color: overlayColor.withOpacity(0.08)));

    // Highlighted (pressed).
    await gesture.down(center);
    await tester.pumpAndSettle();
    expect(
      getOverlayColor(tester),
      paints
        ..rect(color: overlayColor.withOpacity(0.08))
        ..rect(color: overlayColor.withOpacity(0.1)),
    );
    // Remove pressed and hovered states,
    await gesture.up();
    await tester.pumpAndSettle();
    await gesture.moveTo(const Offset(0, 50));
    await tester.pumpAndSettle();

    // Focused.
    await tester.sendKeyEvent(LogicalKeyboardKey.tab);
    await tester.pumpAndSettle();
    expect(getOverlayColor(tester), paints..rect(color: overlayColor.withOpacity(0.1)));
  });
}