// Copyright 2017 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 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_driver/driver_extension.dart';

import 'src/system_navigation.dart';
import 'src/test_step.dart';

void main() {
  enableFlutterDriverExtension();
  runApp(new TestApp());
}

class TestApp extends StatefulWidget {
  @override
  _TestAppState createState() => new _TestAppState();
}

class _TestAppState extends State<TestApp> {
  static final List<TestStep> steps = <TestStep>[
    () => systemNavigatorPop(),
  ];
  Future<TestStepResult> _result;
  int _step = 0;

  @override
  void initState() {
    super.initState();
  }

  void _executeNextStep() {
    setState(() {
      if (_step < steps.length)
        _result = steps[_step++]();
      else
        _result = new Future<TestStepResult>.value(TestStepResult.complete);
    });
  }

  Widget _buildTestResultWidget(
    BuildContext context,
    AsyncSnapshot<TestStepResult> snapshot,
  ) {
    return new TestStepResult.fromSnapshot(snapshot).asWidget(context);
  }

  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Platform Interaction Test',
      home: new Scaffold(
        appBar: new AppBar(
          title: const Text('Platform Interaction Test'),
        ),
        body: new Padding(
          padding: const EdgeInsets.all(20.0),
          child: new FutureBuilder<TestStepResult>(
            future: _result,
            builder: _buildTestResultWidget,
          ),
        ),
        floatingActionButton: new FloatingActionButton(
          key: const ValueKey<String>('step'),
          onPressed: _executeNextStep,
          child: const Icon(Icons.navigate_next),
        ),
      ),
    );
  }
}