// Copyright 2016 The Chromium 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_test/flutter_test.dart';

void main() {
  testWidgets('ExpansionPanelList test', (WidgetTester tester) async {
    int index;
    bool isExpanded;

    await tester.pumpWidget(
      new MaterialApp(
        home: new SingleChildScrollView(
          child: new ExpansionPanelList(
            expansionCallback: (int _index, bool _isExpanded) {
              index = _index;
              isExpanded = _isExpanded;
            },
            children: <ExpansionPanel>[
              new ExpansionPanel(
                headerBuilder: (BuildContext context, bool isExpanded) {
                  return new Text(isExpanded ? 'B' : 'A');
                },
                body: const SizedBox(height: 100.0),
              ),
            ],
          ),
        ),
      ),
    );

    expect(find.text('A'), findsOneWidget);
    expect(find.text('B'), findsNothing);
    RenderBox box = tester.renderObject(find.byType(ExpansionPanelList));
    final double oldHeight = box.size.height;
    expect(find.byType(ExpandIcon), findsOneWidget);
    await tester.tap(find.byType(ExpandIcon));
    expect(index, 0);
    expect(isExpanded, isFalse);
    box = tester.renderObject(find.byType(ExpansionPanelList));
    expect(box.size.height, equals(oldHeight));

    // now expand the child panel
    await tester.pumpWidget(
      new MaterialApp(
        home: new SingleChildScrollView(
          child: new ExpansionPanelList(
            expansionCallback: (int _index, bool _isExpanded) {
              index = _index;
              isExpanded = _isExpanded;
            },
            children: <ExpansionPanel>[
              new ExpansionPanel(
                headerBuilder: (BuildContext context, bool isExpanded) {
                  return new Text(isExpanded ? 'B' : 'A');
                },
                body: const SizedBox(height: 100.0),
                isExpanded: true, // this is the addition
              ),
            ],
          ),
        ),
      ),
    );
    await tester.pump(const Duration(milliseconds: 200));

    expect(find.text('A'), findsNothing);
    expect(find.text('B'), findsOneWidget);
    box = tester.renderObject(find.byType(ExpansionPanelList));
    expect(box.size.height - oldHeight, greaterThanOrEqualTo(100.0)); // 100 + some margin
  });

  testWidgets('Multiple Panel List test', (WidgetTester tester) async {
    await tester.pumpWidget(
      new MaterialApp(
        home: new ListView(
          children: <ExpansionPanelList>[
            new ExpansionPanelList(
              children: <ExpansionPanel>[
                new ExpansionPanel(
                  headerBuilder: (BuildContext context, bool isExpanded) {
                    return new Text(isExpanded ? 'B' : 'A');
                  },
                  body: const SizedBox(height: 100.0),
                  isExpanded: true,
                ),
              ],
            ),
            new ExpansionPanelList(
              children: <ExpansionPanel>[
                new ExpansionPanel(
                  headerBuilder: (BuildContext context, bool isExpanded) {
                    return new Text(isExpanded ? 'D' : 'C');
                  },
                  body: const SizedBox(height: 100.0),
                  isExpanded: true,
                ),
              ],
            ),
          ],
        ),
      ),
    );
    await tester.pump(const Duration(milliseconds: 200));

    expect(find.text('A'), findsNothing);
    expect(find.text('B'), findsOneWidget);
    expect(find.text('C'), findsNothing);
    expect(find.text('D'), findsOneWidget);
  });

  testWidgets('Open/close animations', (WidgetTester tester) async {
    const Duration kSizeAnimationDuration = const Duration(milliseconds: 1000);
    // The MaterialGaps animate in using kThemeAnimationDuration (hardcoded),
    // which should be less than our test size animation length. So we can assume that they
    // appear immediately. Here we just verify that our assumption is true.
    expect(kThemeAnimationDuration, lessThan(kSizeAnimationDuration ~/ 2));

    Widget build(bool a, bool b, bool c) {
      return new MaterialApp(
        home: new Column(
          children: <Widget>[
            new ExpansionPanelList(
              animationDuration: kSizeAnimationDuration,
              children: <ExpansionPanel>[
                new ExpansionPanel(
                  headerBuilder: (BuildContext context, bool isExpanded) => const Placeholder(),
                  body: const SizedBox(height: 100.0, child: const Placeholder()),
                  isExpanded: a,
                ),
                new ExpansionPanel(
                  headerBuilder: (BuildContext context, bool isExpanded) => const Placeholder(),
                  body: const SizedBox(height: 100.0, child: const Placeholder()),
                  isExpanded: b,
                ),
                new ExpansionPanel(
                  headerBuilder: (BuildContext context, bool isExpanded) => const Placeholder(),
                  body: const SizedBox(height: 100.0, child: const Placeholder()),
                  isExpanded: c,
                ),
              ],
            ),
          ],
        ),
      );
    }

    await tester.pumpWidget(build(false, false, false));
    expect(tester.renderObjectList(find.byType(AnimatedSize)), hasLength(3));
    expect(tester.getRect(find.byType(AnimatedSize).at(0)), new Rect.fromLTWH(0.0, 56.0, 800.0, 0.0));
    expect(tester.getRect(find.byType(AnimatedSize).at(1)), new Rect.fromLTWH(0.0, 113.0, 800.0, 0.0));
    expect(tester.getRect(find.byType(AnimatedSize).at(2)), new Rect.fromLTWH(0.0, 170.0, 800.0, 0.0));

    await tester.pump(const Duration(milliseconds: 200));
    expect(tester.getRect(find.byType(AnimatedSize).at(0)), new Rect.fromLTWH(0.0, 56.0, 800.0, 0.0));
    expect(tester.getRect(find.byType(AnimatedSize).at(1)), new Rect.fromLTWH(0.0, 113.0, 800.0, 0.0));
    expect(tester.getRect(find.byType(AnimatedSize).at(2)), new Rect.fromLTWH(0.0, 170.0, 800.0, 0.0));

    await tester.pumpWidget(build(false, true, false));
    expect(tester.getRect(find.byType(AnimatedSize).at(0)), new Rect.fromLTWH(0.0, 56.0, 800.0, 0.0));
    expect(tester.getRect(find.byType(AnimatedSize).at(1)), new Rect.fromLTWH(0.0, 113.0, 800.0, 0.0));
    expect(tester.getRect(find.byType(AnimatedSize).at(2)), new Rect.fromLTWH(0.0, 170.0, 800.0, 0.0));

    await tester.pump(kSizeAnimationDuration ~/ 2);
    expect(tester.getRect(find.byType(AnimatedSize).at(0)), new Rect.fromLTWH(0.0, 56.0, 800.0, 0.0));
    final Rect rect1 = tester.getRect(find.byType(AnimatedSize).at(1));
    expect(rect1.left, 0.0);
    expect(rect1.top, inExclusiveRange(113.0, 113.0 + 16.0 + 32.0)); // 16.0 material gap, plus 16.0 top and bottom margins added to the header
    expect(rect1.width, 800.0);
    expect(rect1.height, inExclusiveRange(0.0, 100.0));
    final Rect rect2 = tester.getRect(find.byType(AnimatedSize).at(2));
    expect(rect2, new Rect.fromLTWH(0.0, rect1.bottom + 16.0 + 56.0, 800.0, 0.0)); // the 16.0 comes from the MaterialGap being introduced, the 56.0 is the header height.

    await tester.pumpWidget(build(false, false, false));
    expect(tester.getRect(find.byType(AnimatedSize).at(0)), new Rect.fromLTWH(0.0, 56.0, 800.0, 0.0));
    expect(tester.getRect(find.byType(AnimatedSize).at(1)), rect1);
    expect(tester.getRect(find.byType(AnimatedSize).at(2)), rect2);

    await tester.pumpWidget(build(false, false, true));
    expect(tester.getRect(find.byType(AnimatedSize).at(0)), new Rect.fromLTWH(0.0, 56.0, 800.0, 0.0));
    expect(tester.getRect(find.byType(AnimatedSize).at(1)), rect1);
    expect(tester.getRect(find.byType(AnimatedSize).at(2)), rect2);

    // a few no-op pumps to make sure there's nothing fishy going on
    await tester.pump();
    await tester.pump();
    await tester.pump();
    expect(tester.getRect(find.byType(AnimatedSize).at(0)), new Rect.fromLTWH(0.0, 56.0, 800.0, 0.0));
    expect(tester.getRect(find.byType(AnimatedSize).at(1)), rect1);
    expect(tester.getRect(find.byType(AnimatedSize).at(2)), rect2);

    await tester.pumpAndSettle();
    expect(tester.getRect(find.byType(AnimatedSize).at(0)), new Rect.fromLTWH(0.0, 56.0, 800.0, 0.0));
    expect(tester.getRect(find.byType(AnimatedSize).at(1)), new Rect.fromLTWH(0.0, 56.0 + 1.0 + 56.0, 800.0, 0.0));
    expect(tester.getRect(find.byType(AnimatedSize).at(2)), new Rect.fromLTWH(0.0, 56.0 + 1.0 + 56.0 + 16.0 + 16.0 + 48.0 + 16.0, 800.0, 100.0));
  });
}