// 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_api_samples/widgets/gesture_detector/gesture_detector.2.dart'
    as example;
import 'package:flutter_test/flutter_test.dart';

void main() {
  void expectBorders(
    WidgetTester tester, {
    required bool expectGreenHasBorder,
    required bool expectYellowHasBorder,
  }) {
    final Finder containerFinder = find.byType(Container);
    final Finder greenFinder = containerFinder.first;
    final Finder yellowFinder = containerFinder.last;

    final Container greenContainer = tester.firstWidget<Container>(greenFinder);
    final BoxDecoration? greenDecoration =
        greenContainer.decoration as BoxDecoration?;
    expect(greenDecoration?.border, expectGreenHasBorder ? isNot(null) : null);

    final Container yellowContainer = tester.firstWidget<Container>(
      yellowFinder,
    );
    final BoxDecoration? yellowDecoration =
        yellowContainer.decoration as BoxDecoration?;
    expect(
      yellowDecoration?.border,
      expectYellowHasBorder ? isNot(null) : null,
    );
  }

  void expectInnerGestureDetectorBehavior(
    WidgetTester tester,
    HitTestBehavior behavior,
  ) {
    // There is a third GestureDetector added by Scaffold.
    final Finder innerGestureDetectorFinder = find
        .byType(GestureDetector)
        .at(1);
    final GestureDetector innerGestureDetector = tester
        .firstWidget<GestureDetector>(innerGestureDetectorFinder);
    expect(innerGestureDetector.behavior, behavior);
  }

  testWidgets('Only the green Container shows a red border when tapped', (
    WidgetTester tester,
  ) async {
    await tester.pumpWidget(const example.NestedGestureDetectorsApp());

    final Finder greenFinder = find.byType(Container).first;
    final Offset greenTopLeftCorner = tester.getTopLeft(greenFinder);
    await tester.tapAt(greenTopLeftCorner);
    await tester.pumpAndSettle();
    expectBorders(
      tester,
      expectGreenHasBorder: true,
      expectYellowHasBorder: false,
    );

    // Tap on the button to toggle inner GestureDetector.behavior
    final Finder toggleBehaviorFinder = find.byType(ElevatedButton).last;
    await tester.tap(toggleBehaviorFinder);
    await tester.pump();
    expectInnerGestureDetectorBehavior(tester, HitTestBehavior.translucent);

    // Tap again on the green container, expect nothing changed
    await tester.tapAt(greenTopLeftCorner);
    await tester.pump();
    expectBorders(
      tester,
      expectGreenHasBorder: true,
      expectYellowHasBorder: false,
    );

    // Tap on the reset button
    final Finder resetFinder = find.byType(ElevatedButton).first;
    await tester.tap(resetFinder);
    await tester.pump();
    expectInnerGestureDetectorBehavior(tester, HitTestBehavior.opaque);
  });

  testWidgets('Only the yellow Container shows a red border when tapped', (
    WidgetTester tester,
  ) async {
    await tester.pumpWidget(const example.NestedGestureDetectorsApp());

    final Finder yellowFinder = find.byType(Container).last;
    final Offset yellowTopLeftCorner = tester.getTopLeft(yellowFinder);
    await tester.tapAt(yellowTopLeftCorner);
    await tester.pump();
    expectBorders(
      tester,
      expectGreenHasBorder: false,
      expectYellowHasBorder: true,
    );

    // Tap on the button to toggle inner GestureDetector.behavior
    final Finder toggleBehaviorFinder = find.byType(ElevatedButton).last;
    await tester.tap(toggleBehaviorFinder);
    await tester.pump();
    expectInnerGestureDetectorBehavior(tester, HitTestBehavior.translucent);

    // Tap again on the yellow container, expect nothing changed
    await tester.tapAt(yellowTopLeftCorner);
    await tester.pump();
    expectBorders(
      tester,
      expectGreenHasBorder: false,
      expectYellowHasBorder: true,
    );

    // Tap on the reset button
    final Finder resetFinder = find.byType(ElevatedButton).first;
    await tester.tap(resetFinder);
    await tester.pump();
    expectInnerGestureDetectorBehavior(tester, HitTestBehavior.opaque);
  });
}