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

typedef PostInvokeCallback = void Function({Action<Intent> action, Intent intent, ActionDispatcher dispatcher});

class TestIntent extends Intent {
  const TestIntent();
}

class SecondTestIntent extends TestIntent {
  const SecondTestIntent();
}

class ThirdTestIntent extends SecondTestIntent {
  const ThirdTestIntent();
}

class TestAction extends CallbackAction<TestIntent> {
  TestAction({
    @required OnInvokeCallback onInvoke,
  })  : assert(onInvoke != null),
        super(onInvoke: onInvoke);

  @override
  bool isEnabled(TestIntent intent) => enabled;

  bool get enabled => _enabled;
  bool _enabled = true;
  set enabled(bool value) {
    if (_enabled == value) {
      return;
    }
    _enabled = value;
    notifyActionListeners();
  }

  @override
  void addActionListener(ActionListenerCallback listener) {
    super.addActionListener(listener);
    listeners.add(listener);
  }

  @override
  void removeActionListener(ActionListenerCallback listener) {
    super.removeActionListener(listener);
    listeners.remove(listener);
  }
  List<ActionListenerCallback> listeners = <ActionListenerCallback>[];

  void _testInvoke(TestIntent intent) => invoke(intent);
}

class TestDispatcher extends ActionDispatcher {
  const TestDispatcher({this.postInvoke});

  final PostInvokeCallback postInvoke;

  @override
  Object invokeAction(Action<Intent> action, Intent intent, [BuildContext context]) {
    final Object result = super.invokeAction(action, intent, context);
    postInvoke?.call(action: action, intent: intent, dispatcher: this);
    return result;
  }
}

class TestDispatcher1 extends TestDispatcher {
  const TestDispatcher1({PostInvokeCallback postInvoke}) : super(postInvoke: postInvoke);
}

void main() {
  testWidgets('CallbackAction passes correct intent when invoked.', (WidgetTester tester) async {
    Intent passedIntent;
    final TestAction action = TestAction(onInvoke: (Intent intent) {
      passedIntent = intent;
      return true;
    });
    const TestIntent intent = TestIntent();
    action._testInvoke(intent);
    expect(passedIntent, equals(intent));
  });
  group(ActionDispatcher, () {
    testWidgets('ActionDispatcher invokes actions when asked.', (WidgetTester tester) async {
      await tester.pumpWidget(Container());
      bool invoked = false;
      const ActionDispatcher dispatcher = ActionDispatcher();
      final Object result = dispatcher.invokeAction(
        TestAction(
          onInvoke: (Intent intent) {
            invoked = true;
            return invoked;
          },
        ),
        const TestIntent(),
      );
      expect(result, isTrue);
      expect(invoked, isTrue);
    });
  });
  group(Actions, () {
    Intent invokedIntent;
    Action<Intent> invokedAction;
    ActionDispatcher invokedDispatcher;

    void collect({Action<Intent> action, Intent intent, ActionDispatcher dispatcher}) {
      invokedIntent = intent;
      invokedAction = action;
      invokedDispatcher = dispatcher;
    }

    void clear() {
      invokedIntent = null;
      invokedAction = null;
      invokedDispatcher = null;
    }

    setUp(clear);

    testWidgets('Actions widget can invoke actions with default dispatcher', (WidgetTester tester) async {
      final GlobalKey containerKey = GlobalKey();
      bool invoked = false;

      await tester.pumpWidget(
        Actions(
          actions: <Type, Action<Intent>>{
            TestIntent: TestAction(
              onInvoke: (Intent intent) {
                invoked = true;
                return invoked;
              },
            ),
          },
          child: Container(key: containerKey),
        ),
      );

      await tester.pump();
      final Object result = Actions.invoke(
        containerKey.currentContext,
        const TestIntent(),
      );
      expect(result, isTrue);
      expect(invoked, isTrue);
    });
    testWidgets('Actions widget can invoke actions with custom dispatcher', (WidgetTester tester) async {
      final GlobalKey containerKey = GlobalKey();
      bool invoked = false;
      const TestIntent intent = TestIntent();
      final Action<Intent> testAction = TestAction(
        onInvoke: (Intent intent) {
          invoked = true;
          return invoked;
        },
      );

      await tester.pumpWidget(
        Actions(
          dispatcher: TestDispatcher(postInvoke: collect),
          actions: <Type, Action<Intent>>{
            TestIntent: testAction,
          },
          child: Container(key: containerKey),
        ),
      );

      await tester.pump();
      final Object result = Actions.invoke<TestIntent>(
        containerKey.currentContext,
        intent,
      );
      expect(result, isTrue);
      expect(invoked, isTrue);
      expect(invokedIntent, equals(intent));
    });
    testWidgets('Actions can invoke actions in ancestor dispatcher', (WidgetTester tester) async {
      final GlobalKey containerKey = GlobalKey();
      bool invoked = false;
      const TestIntent intent = TestIntent();
      final Action<Intent> testAction = TestAction(
        onInvoke: (Intent intent) {
          invoked = true;
          return invoked;
        },
      );

      await tester.pumpWidget(
        Actions(
          dispatcher: TestDispatcher1(postInvoke: collect),
          actions: <Type, Action<Intent>>{
            TestIntent: testAction,
          },
          child: Actions(
            dispatcher: TestDispatcher(postInvoke: collect),
            actions: const <Type, Action<Intent>>{},
            child: Container(key: containerKey),
          ),
        ),
      );

      await tester.pump();
      final Object result = Actions.invoke<TestIntent>(
        containerKey.currentContext,
        intent,
      );
      expect(result, isTrue);
      expect(invoked, isTrue);
      expect(invokedIntent, equals(intent));
      expect(invokedAction, equals(testAction));
      expect(invokedDispatcher.runtimeType, equals(TestDispatcher1));
    });
    testWidgets("Actions can invoke actions in ancestor dispatcher if a lower one isn't specified", (WidgetTester tester) async {
      final GlobalKey containerKey = GlobalKey();
      bool invoked = false;
      const TestIntent intent = TestIntent();
      final Action<Intent> testAction = TestAction(
        onInvoke: (Intent intent) {
          invoked = true;
          return invoked;
        },
      );

      await tester.pumpWidget(
        Actions(
          dispatcher: TestDispatcher1(postInvoke: collect),
          actions: <Type, Action<Intent>>{
            TestIntent: testAction,
          },
          child: Actions(
            actions: const <Type, Action<Intent>>{},
            child: Container(key: containerKey),
          ),
        ),
      );

      await tester.pump();
      final Object result = Actions.invoke<TestIntent>(
        containerKey.currentContext,
        intent,
      );
      expect(result, isTrue);
      expect(invoked, isTrue);
      expect(invokedIntent, equals(intent));
      expect(invokedAction, equals(testAction));
      expect(invokedDispatcher.runtimeType, equals(TestDispatcher1));
    });
    testWidgets('Actions widget can be found with of', (WidgetTester tester) async {
      final GlobalKey containerKey = GlobalKey();
      final ActionDispatcher testDispatcher = TestDispatcher1(postInvoke: collect);

      await tester.pumpWidget(
        Actions(
          dispatcher: testDispatcher,
          actions: const <Type, Action<Intent>>{},
          child: Container(key: containerKey),
        ),
      );

      await tester.pump();
      final ActionDispatcher dispatcher = Actions.of(
        containerKey.currentContext,
        nullOk: true,
      );
      expect(dispatcher, equals(testDispatcher));
    });
    testWidgets('Action can be found with find', (WidgetTester tester) async {
      final GlobalKey containerKey = GlobalKey();
      final ActionDispatcher testDispatcher = TestDispatcher1(postInvoke: collect);
      bool invoked = false;
      final TestAction testAction = TestAction(
        onInvoke: (Intent intent) {
          invoked = true;
          return invoked;
        },
      );
      await tester.pumpWidget(
        Actions(
          dispatcher: testDispatcher,
          actions: <Type, Action<Intent>>{
            TestIntent: testAction,
          },
          child: Actions(
            actions: const <Type, Action<Intent>>{},
            child: Container(key: containerKey),
          ),
        ),
      );

      await tester.pump();
      expect(Actions.find<TestIntent>(containerKey.currentContext), equals(testAction));
      expect(() => Actions.find<DoNothingIntent>(containerKey.currentContext), throwsAssertionError);
      expect(Actions.find<DoNothingIntent>(containerKey.currentContext, nullOk: true), isNull);

      await tester.pumpWidget(
        Actions(
          dispatcher: testDispatcher,
          actions: <Type, Action<Intent>>{
            TestIntent: testAction,
          },
          child: Container(
            child: Actions(
              actions: const <Type, Action<Intent>>{},
              child: Container(key: containerKey),
            ),
          ),
        ),
      );

      await tester.pump();
      expect(Actions.find<TestIntent>(containerKey.currentContext), equals(testAction));
      expect(() => Actions.find<DoNothingIntent>(containerKey.currentContext), throwsAssertionError);
      expect(Actions.find<DoNothingIntent>(containerKey.currentContext, nullOk: true), isNull);
    });
    testWidgets('FocusableActionDetector keeps track of focus and hover even when disabled.', (WidgetTester tester) async {
      FocusManager.instance.highlightStrategy = FocusHighlightStrategy.alwaysTraditional;
      final GlobalKey containerKey = GlobalKey();
      bool invoked = false;
      const Intent intent = TestIntent();
      final FocusNode focusNode = FocusNode(debugLabel: 'Test Node');
      final Action<Intent> testAction = TestAction(
        onInvoke: (Intent intent) {
          invoked = true;
          return invoked;
        },
      );
      bool hovering = false;
      bool focusing = false;

      Future<void> buildTest(bool enabled) async {
        await tester.pumpWidget(
          Center(
            child: Actions(
              dispatcher: TestDispatcher1(postInvoke: collect),
              actions: const <Type, Action<Intent>>{},
              child: FocusableActionDetector(
                enabled: enabled,
                focusNode: focusNode,
                shortcuts: <LogicalKeySet, Intent>{
                  LogicalKeySet(LogicalKeyboardKey.enter): intent,
                },
                actions: <Type, Action<Intent>>{
                  TestIntent: testAction,
                },
                onShowHoverHighlight: (bool value) => hovering = value,
                onShowFocusHighlight: (bool value) => focusing = value,
                child: Container(width: 100, height: 100, key: containerKey),
              ),
            ),
          ),
        );
        return tester.pump();
      }

      await buildTest(true);
      focusNode.requestFocus();
      await tester.pump();
      final TestGesture gesture = await tester.createGesture(kind: PointerDeviceKind.mouse);
      addTearDown(gesture.removePointer);
      await gesture.moveTo(tester.getCenter(find.byKey(containerKey)));
      await tester.pump();
      await tester.sendKeyEvent(LogicalKeyboardKey.enter);
      expect(hovering, isTrue);
      expect(focusing, isTrue);
      expect(invoked, isTrue);

      invoked = false;
      await buildTest(false);
      expect(hovering, isFalse);
      expect(focusing, isFalse);
      await tester.sendKeyEvent(LogicalKeyboardKey.enter);
      await tester.pump();
      expect(invoked, isFalse);
      await buildTest(true);
      expect(focusing, isFalse);
      expect(hovering, isTrue);
      await buildTest(false);
      expect(focusing, isFalse);
      expect(hovering, isFalse);
      await gesture.moveTo(Offset.zero);
      await buildTest(true);
      expect(hovering, isFalse);
      expect(focusing, isFalse);
    });
  });

  group('Listening', () {
    testWidgets('can listen to enabled state of Actions', (WidgetTester tester) async {
      final GlobalKey containerKey = GlobalKey();
      bool invoked1 = false;
      bool invoked2 = false;
      bool invoked3 = false;
      final TestAction action1 = TestAction(
        onInvoke: (Intent intent) {
          invoked1 = true;
          return invoked1;
        },
      );
      final TestAction action2 = TestAction(
        onInvoke: (Intent intent) {
          invoked2 = true;
          return invoked2;
        },
      );
      final TestAction action3 = TestAction(
        onInvoke: (Intent intent) {
          invoked3 = true;
          return invoked3;
        },
      );
      bool enabled1 = true;
      action1.addActionListener((Action<Intent> action) => enabled1 = action.isEnabled(const TestIntent()));
      action1.enabled = false;
      expect(enabled1, isFalse);

      bool enabled2 = true;
      action2.addActionListener((Action<Intent> action) => enabled2 = action.isEnabled(const SecondTestIntent()));
      action2.enabled = false;
      expect(enabled2, isFalse);

      bool enabled3 = true;
      action3.addActionListener((Action<Intent> action) => enabled3 = action.isEnabled(const ThirdTestIntent()));
      action3.enabled = false;
      expect(enabled3, isFalse);

      await tester.pumpWidget(
        Actions(
          actions: <Type, Action<TestIntent>>{
            TestIntent: action1,
            SecondTestIntent: action2,
          },
          child: Actions(
            actions: <Type, Action<TestIntent>>{
              ThirdTestIntent: action3,
            },
            child: Container(key: containerKey),
          ),
        ),
      );

      Object result = Actions.invoke(
        containerKey.currentContext,
        const TestIntent(),
      );
      expect(enabled1, isFalse);
      expect(result, isFalse);
      expect(invoked1, isFalse);

      action1.enabled = true;
      result = Actions.invoke(
        containerKey.currentContext,
        const TestIntent(),
      );
      expect(enabled1, isTrue);
      expect(result, isTrue);
      expect(invoked1, isTrue);

      bool enabledChanged;
      await tester.pumpWidget(
        Actions(
          actions: <Type, Action<Intent>>{
            TestIntent: action1,
            SecondTestIntent: action2,
          },
          child: ActionListener(
            listener: (Action<Intent> action) => enabledChanged = action.isEnabled(const ThirdTestIntent()),
            action: action2,
            child: Actions(
              actions: <Type, Action<Intent>>{
                ThirdTestIntent: action3,
              },
              child: Container(key: containerKey),
            ),
          ),
        ),
      );

      await tester.pump();
      result = Actions.invoke<TestIntent>(
        containerKey.currentContext,
        const SecondTestIntent(),
      );
      expect(enabledChanged, isNull);
      expect(enabled2, isFalse);
      expect(result, isFalse);
      expect(invoked2, isFalse);

      action2.enabled = true;
      expect(enabledChanged, isTrue);
      result = Actions.invoke<TestIntent>(
        containerKey.currentContext,
        const SecondTestIntent(),
      );
      expect(enabled2, isTrue);
      expect(result, isTrue);
      expect(invoked2, isTrue);

      await tester.pumpWidget(
        Actions(
          actions: <Type, Action<Intent>>{
            TestIntent: action1,
          },
          child: Actions(
            actions: <Type, Action<Intent>>{
              ThirdTestIntent: action3,
            },
            child: Container(key: containerKey),
          ),
        ),
      );

      expect(action1.listeners.length, equals(2));
      expect(action2.listeners.length, equals(1));
      expect(action3.listeners.length, equals(2));

      await tester.pumpWidget(
        Actions(
          actions: <Type, Action<Intent>>{
            TestIntent: action1,
            ThirdTestIntent: action3,
          },
          child: Container(key: containerKey),
        ),
      );

      expect(action1.listeners.length, equals(2));
      expect(action2.listeners.length, equals(1));
      expect(action3.listeners.length, equals(2));

      await tester.pumpWidget(
        Actions(
          actions: <Type, Action<Intent>>{
            TestIntent: action1,
          },
          child: Container(key: containerKey),
        ),
      );

      expect(action1.listeners.length, equals(2));
      expect(action2.listeners.length, equals(1));
      expect(action3.listeners.length, equals(1));

      await tester.pumpWidget(Container());
      await tester.pump();

      expect(action1.listeners.length, equals(1));
      expect(action2.listeners.length, equals(1));
      expect(action3.listeners.length, equals(1));
    });
  });

  group('Diagnostics', () {
    testWidgets('default Intent debugFillProperties', (WidgetTester tester) async {
      final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();

      // ignore: invalid_use_of_protected_member
      const TestIntent().debugFillProperties(builder);

      final List<String> description = builder.properties
        .where((DiagnosticsNode node) {
          return !node.isFiltered(DiagnosticLevel.info);
        })
        .map((DiagnosticsNode node) => node.toString())
        .toList();

      expect(description, isEmpty);
    });
    testWidgets('default Actions debugFillProperties', (WidgetTester tester) async {
      final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();

      Actions(
        actions: const <Type, Action<Intent>>{},
        dispatcher: const ActionDispatcher(),
        child: Container(),
      ).debugFillProperties(builder);

      final List<String> description = builder.properties
        .where((DiagnosticsNode node) {
          return !node.isFiltered(DiagnosticLevel.info);
        })
        .map((DiagnosticsNode node) => node.toString())
        .toList();

      expect(description.length, equals(2));
      expect(description[0], equalsIgnoringHashCodes('dispatcher: ActionDispatcher#00000'));
      expect(description[1], equals('actions: {}'));
    });
    testWidgets('Actions implements debugFillProperties', (WidgetTester tester) async {
      final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();

      Actions(
        key: const ValueKey<String>('foo'),
        dispatcher: const ActionDispatcher(),
        actions: <Type, Action<Intent>>{
          TestIntent: TestAction(onInvoke: (Intent intent) => null),
        },
        child: Container(key: const ValueKey<String>('baz')),
      ).debugFillProperties(builder);

      final List<String> description = builder.properties
          .where((DiagnosticsNode node) {
            return !node.isFiltered(DiagnosticLevel.info);
          })
          .map((DiagnosticsNode node) => node.toString())
          .toList();

      expect(description.length, equals(2));
      expect(description[0], equalsIgnoringHashCodes('dispatcher: ActionDispatcher#00000'));
      expect(description[1], equalsIgnoringHashCodes('actions: {TestIntent: TestAction#00000}'));
    }, skip: isBrowser);
  });
}