import 'dart:io';

import 'package:collection/collection.dart' show IterableExtension;
import 'package:flutter/material.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:freezer/api/cache.dart';
import 'package:freezer/api/download.dart';
import 'package:freezer/ui/elements.dart';
import 'package:freezer/translations.i18n.dart';
import 'package:freezer/ui/error.dart';
import 'package:http/http.dart' as http;
import 'package:open_file/open_file.dart';
import 'package:package_info/package_info.dart';
import 'package:path_provider/path_provider.dart';
import 'package:path/path.dart' as p;
import 'dart:convert';

import 'package:version/version.dart';

class UpdaterScreen extends StatefulWidget {
  @override
  _UpdaterScreenState createState() => _UpdaterScreenState();
}

class _UpdaterScreenState extends State<UpdaterScreen> {
  bool _loading = true;
  bool _error = false;
  late FreezerVersions _versions;
  String? _current;
  String? _arch;
  double _progress = 0.0;
  bool _buttonEnabled = true;

  Future _load() async {
    //Load current version
    PackageInfo info = await PackageInfo.fromPlatform();
    setState(() => _current = info.version);

    //Get architecture
    _arch = await DownloadManager.platform.invokeMethod("arch");
    if (_arch == 'armv8l') _arch = 'arm32';

    //Load from website
    try {
      FreezerVersions versions = await FreezerVersions.fetch();
      setState(() {
        _versions = versions;
        _loading = false;
      });
    } catch (e, st) {
      print(e.toString() + st.toString());
      _error = true;
      _loading = false;
    }
  }

  FreezerDownload? get _versionDownload {
    return _versions.versions![0].downloads!.firstWhereOrNull(
        (d) => d.version!.toLowerCase().contains(_arch!.toLowerCase()));
  }

  Future _download() async {
    String url = _versionDownload!.directUrl!;
    //Start request
    http.Client client = new http.Client();
    http.StreamedResponse res =
        await client.send(http.Request('GET', Uri.parse(url)));
    int? size = res.contentLength;
    //Open file
    String path =
        p.join((await getExternalStorageDirectory())!.path, 'update.apk');
    File file = File(path);
    IOSink fileSink = file.openWrite();
    //Update progress
    Future.doWhile(() async {
      int received = await file.length();
      setState(() => _progress = received / size!);
      return received != size;
    });
    //Pipe
    await res.stream.pipe(fileSink);
    fileSink.close();

    OpenFile.open(path);
    setState(() => _buttonEnabled = true);
  }

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: FreezerAppBar('Updates'.i18n),
        body: ListView(
          children: [
            if (_error) ErrorScreen(),
            if (_loading)
              Padding(
                padding: EdgeInsets.all(8.0),
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [CircularProgressIndicator()],
                ),
              ),
            if (!_error &&
                !_loading &&
                Version.parse(_versions.latest) <= Version.parse(_current))
              Center(
                  child: Padding(
                padding: EdgeInsets.all(8.0),
                child: Text('You are running latest version!'.i18n,
                    textAlign: TextAlign.center,
                    style: TextStyle(fontSize: 26.0)),
              )),
            if (!_error &&
                !_loading &&
                Version.parse(_versions.latest) > Version.parse(_current))
              Column(
                children: [
                  Padding(
                    padding: EdgeInsets.all(8.0),
                    child: Text(
                      'New update available!'.i18n + ' ' + _versions.latest!,
                      textAlign: TextAlign.center,
                      style: TextStyle(
                          fontSize: 20.0, fontWeight: FontWeight.bold),
                    ),
                  ),
                  Text(
                    'Current version: ' + _current!,
                    style:
                        TextStyle(fontSize: 14.0, fontStyle: FontStyle.italic),
                  ),
                  Container(height: 8.0),
                  FreezerDivider(),
                  Container(height: 8.0),
                  Text(
                    'Changelog',
                    style:
                        TextStyle(fontSize: 20.0, fontWeight: FontWeight.bold),
                  ),
                  Padding(
                    padding: EdgeInsets.fromLTRB(16, 4, 16, 8),
                    child: Text(
                      _versions.versions![0].changelog!,
                      style: TextStyle(fontSize: 16.0),
                    ),
                  ),
                  FreezerDivider(),
                  Container(height: 8.0),
                  //Available download
                  if (_versionDownload != null)
                    Column(children: [
                      ElevatedButton(
                          child: Text('Download'.i18n +
                              ' (${_versionDownload!.version})'),
                          onPressed: _buttonEnabled
                              ? () {
                                  setState(() => _buttonEnabled = false);
                                  _download();
                                }
                              : null),
                      Padding(
                        padding: EdgeInsets.all(8.0),
                        child: LinearProgressIndicator(value: _progress),
                      )
                    ]),
                  //Unsupported arch
                  if (_versionDownload == null)
                    Text(
                      'Unsupported platform!'.i18n + ' $_arch',
                      textAlign: TextAlign.center,
                      style: TextStyle(fontSize: 16.0),
                    )
                ],
              )
          ],
        ));
  }
}

class FreezerVersions {
  String? latest;
  List<FreezerVersion>? versions;

  FreezerVersions({this.latest, this.versions});

  factory FreezerVersions.fromJson(Map data) => FreezerVersions(
      latest: data['android']['latest'],
      versions: data['android']['versions']
          .map<FreezerVersion>((v) => FreezerVersion.fromJson(v))
          .toList());

  //Fetch from website API
  static Future<FreezerVersions> fetch() async {
    http.Response response =
        await http.get(Uri.parse('https://freezer.life/api/versions'));
//    http.Response response = await http.get('https://cum.freezerapp.workers.dev/api/versions');
    return FreezerVersions.fromJson(jsonDecode(response.body));
  }

  static Future checkUpdate() async {
    //Check only each 24h
    int updateDelay = 86400000;
    if ((DateTime.now().millisecondsSinceEpoch - (cache.lastUpdateCheck ?? 0)) <
        updateDelay) return;
    cache.lastUpdateCheck = DateTime.now().millisecondsSinceEpoch;
    await cache.save();

    FreezerVersions versions = await FreezerVersions.fetch();

    //Load current version
    PackageInfo info = await PackageInfo.fromPlatform();
    if (Version.parse(versions.latest) <= Version.parse(info.version)) return;

    //Get architecture
    String? _arch = await DownloadManager.platform.invokeMethod("arch");
    if (_arch == 'armv8l') _arch = 'arm32';
    //Check compatible architecture
    if (versions.versions![0].downloads!.firstWhereOrNull(
            (d) => d.version!.toLowerCase().contains(_arch!.toLowerCase())) ==
        null) return;

    //Show notification
    FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
        FlutterLocalNotificationsPlugin();
    const AndroidInitializationSettings androidInitializationSettings =
        AndroidInitializationSettings('drawable/ic_logo');
    final InitializationSettings initializationSettings =
        InitializationSettings(android: androidInitializationSettings);
    await flutterLocalNotificationsPlugin.initialize(initializationSettings);
    AndroidNotificationDetails androidNotificationDetails =
        AndroidNotificationDetails(
            'freezerupdates', 'Freezer Updates'.i18n, 'Freezer Updates'.i18n);
    NotificationDetails notificationDetails =
        NotificationDetails(android: androidNotificationDetails);
    await flutterLocalNotificationsPlugin.show(0, 'New update available!'.i18n,
        'Update to latest version in the settings.'.i18n, notificationDetails);
  }
}

class FreezerVersion {
  String? version;
  String? changelog;
  List<FreezerDownload>? downloads;

  FreezerVersion({this.version, this.changelog, this.downloads});

  factory FreezerVersion.fromJson(Map data) => FreezerVersion(
      version: data['version'],
      changelog: data['changelog'],
      downloads: data['downloads']
          .map<FreezerDownload>((d) => FreezerDownload.fromJson(d))
          .toList());
}

class FreezerDownload {
  String? version;
  String? directUrl;

  FreezerDownload({this.version, this.directUrl});

  factory FreezerDownload.fromJson(Map data) => FreezerDownload(
      version: data['version'], directUrl: data['links'].first['url']);
}