// Copyright 2013 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.

// ignore_for_file: public_member_api_docs

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:url_launcher/link.dart';
import 'package:url_launcher/url_launcher.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'URL Launcher',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'URL Launcher'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);
  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  bool _hasCallSupport = false;
  Future<void>? _launched;
  String _phone = '';

  @override
  void initState() {
    super.initState();
    // Check for phone call support.
    canLaunch('tel:123').then((bool result) {
      setState(() {
        _hasCallSupport = result;
      });
    });
  }

  Future<void> _launchInBrowser(String url) async {
    if (!await launch(
      url,
      forceSafariVC: false,
      forceWebView: false,
      headers: <String, String>{'my_header_key': 'my_header_value'},
    )) {
      throw 'Could not launch $url';
    }
  }

  Future<void> _launchInWebViewOrVC(String url) async {
    if (!await launch(
      url,
      forceSafariVC: true,
      forceWebView: true,
      headers: <String, String>{'my_header_key': 'my_header_value'},
    )) {
      throw 'Could not launch $url';
    }
  }

  Future<void> _launchInWebViewWithJavaScript(String url) async {
    if (!await launch(
      url,
      forceSafariVC: true,
      forceWebView: true,
      enableJavaScript: true,
    )) {
      throw 'Could not launch $url';
    }
  }

  Future<void> _launchInWebViewWithDomStorage(String url) async {
    if (!await launch(
      url,
      forceSafariVC: true,
      forceWebView: true,
      enableDomStorage: true,
    )) {
      throw 'Could not launch $url';
    }
  }

  Future<void> _launchUniversalLinkIos(String url) async {
    final bool nativeAppLaunchSucceeded = await launch(
      url,
      forceSafariVC: false,
      universalLinksOnly: true,
    );
    if (!nativeAppLaunchSucceeded) {
      await launch(
        url,
        forceSafariVC: true,
      );
    }
  }

  Widget _launchStatus(BuildContext context, AsyncSnapshot<void> snapshot) {
    if (snapshot.hasError) {
      return Text('Error: ${snapshot.error}');
    } else {
      return const Text('');
    }
  }

  Future<void> _makePhoneCall(String phoneNumber) async {
    // Use `Uri` to ensure that `phoneNumber` is properly URL-encoded.
    // Just using 'tel:$phoneNumber' would create invalid URLs in some cases,
    // such as spaces in the input, which would cause `launch` to fail on some
    // platforms.
    final Uri launchUri = Uri(
      scheme: 'tel',
      path: phoneNumber,
    );
    await launch(launchUri.toString());
  }

  @override
  Widget build(BuildContext context) {
    // onPressed calls using this URL are not gated on a 'canLaunch' check
    // because the assumption is that every device can launch a web URL.
    const String toLaunch = 'https://www.cylog.org/headers/';
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: ListView(
        children: <Widget>[
          Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Padding(
                padding: const EdgeInsets.all(16.0),
                child: TextField(
                    onChanged: (String text) => _phone = text,
                    decoration: const InputDecoration(
                        hintText: 'Input the phone number to launch')),
              ),
              ElevatedButton(
                onPressed: _hasCallSupport
                    ? () => setState(() {
                          _launched = _makePhoneCall(_phone);
                        })
                    : null,
                child: _hasCallSupport
                    ? const Text('Make phone call')
                    : const Text('Calling not supported'),
              ),
              const Padding(
                padding: EdgeInsets.all(16.0),
                child: Text(toLaunch),
              ),
              ElevatedButton(
                onPressed: () => setState(() {
                  _launched = _launchInBrowser(toLaunch);
                }),
                child: const Text('Launch in browser'),
              ),
              const Padding(padding: EdgeInsets.all(16.0)),
              ElevatedButton(
                onPressed: () => setState(() {
                  _launched = _launchInWebViewOrVC(toLaunch);
                }),
                child: const Text('Launch in app'),
              ),
              ElevatedButton(
                onPressed: () => setState(() {
                  _launched = _launchInWebViewWithJavaScript(toLaunch);
                }),
                child: const Text('Launch in app(JavaScript ON)'),
              ),
              ElevatedButton(
                onPressed: () => setState(() {
                  _launched = _launchInWebViewWithDomStorage(toLaunch);
                }),
                child: const Text('Launch in app(DOM storage ON)'),
              ),
              const Padding(padding: EdgeInsets.all(16.0)),
              ElevatedButton(
                onPressed: () => setState(() {
                  _launched = _launchUniversalLinkIos(toLaunch);
                }),
                child: const Text(
                    'Launch a universal link in a native app, fallback to Safari.(Youtube)'),
              ),
              const Padding(padding: EdgeInsets.all(16.0)),
              ElevatedButton(
                onPressed: () => setState(() {
                  _launched = _launchInWebViewOrVC(toLaunch);
                  Timer(const Duration(seconds: 5), () {
                    print('Closing WebView after 5 seconds...');
                    closeWebView();
                  });
                }),
                child: const Text('Launch in app + close after 5 seconds'),
              ),
              const Padding(padding: EdgeInsets.all(16.0)),
              Link(
                uri: Uri.parse(
                    'https://pub.dev/documentation/url_launcher/latest/link/link-library.html'),
                target: LinkTarget.blank,
                builder: (BuildContext ctx, FollowLink? openLink) {
                  return TextButton.icon(
                    onPressed: openLink,
                    label: const Text('Link Widget documentation'),
                    icon: const Icon(Icons.read_more),
                  );
                },
              ),
              const Padding(padding: EdgeInsets.all(16.0)),
              FutureBuilder<void>(future: _launched, builder: _launchStatus),
            ],
          ),
        ],
      ),
    );
  }
}