import 'package:comunic/helpers/preferences_helper.dart';
import 'package:comunic/helpers/push_notifications_helper.dart';
import 'package:comunic/helpers/server_config_helper.dart';
import 'package:comunic/helpers/users_helper.dart';
import 'package:comunic/models/config.dart';
import 'package:comunic/models/user.dart';
import 'package:comunic/ui/routes/push_notifications_route.dart';
import 'package:comunic/ui/widgets/async_screen_widget.dart';
import 'package:comunic/ui/widgets/login_routes_theme.dart';
import 'package:comunic/ui/widgets/tour/account_image_tour_pane.dart';
import 'package:comunic/ui/widgets/tour/first_pane.dart';
import 'package:comunic/ui/widgets/tour/last_pane.dart';
import 'package:comunic/ui/widgets/tour/presentation_pane.dart';
import 'package:comunic/ui/widgets/tour/tour_notifications_pane.dart';
import 'package:comunic/utils/account_utils.dart';
import 'package:comunic/utils/intl_utils.dart';
import 'package:comunic/utils/log_utils.dart';
import 'package:flutter/material.dart';

/// Tour route
///
/// The tour is shown when the client sign into the application
///
/// @author Pierre Hubert

Future<void> showTour(BuildContext context) async => await Navigator.of(context)
    .push(MaterialPageRoute(builder: (c) => TourRoute()));

typedef TourEntriesBuilder = List<Widget> Function(TourRouteState);

class TourRoute extends StatefulWidget {
  @override
  TourRouteState createState() => TourRouteState();
}

class TourRouteState extends State<TourRoute> {
  final _key = GlobalKey<AsyncScreenWidgetState>();
  final pushNotificationsKey =
      GlobalKey<PushNotificationsConfigurationWidgetState>();

  final Map<int, GlobalKey> pubKeys = Map();

  late User currUser;

  int _defaultIndex = 0;

  bool areNotificationsConfigured = false;

  Future<void> _init() async {
    currUser =
        await UsersHelper().getSingleWithThrow(userID(), forceDownload: true);

    // Pre-configure notifications
    final notificationsStatus = await PushNotificationsHelper.getLocalStatus();
    if (!PushNotificationsHelper.arePushNotificationsAvailable ||
        notificationsStatus != PushNotificationsStatus.UNDEFINED)
      areNotificationsConfigured = true;

    // Attempt to automatically register to FCM
    else if (srvConfig!.notificationsPolicy.hasFirebase) {
      try {
        await PushNotificationsHelper.configure(
            context, PushNotificationsStatus.FIREBASE);
        areNotificationsConfigured = true;
      } catch (e, s) {
        logError(e, s);
      }
    }
  }

  void rebuild() => setState(() {});

  void setStateKeepCurrentIndex(BuildContext cxt) async {
    _defaultIndex = DefaultTabController.of(cxt)!.index;
    await _key.currentState!.refresh();
  }

  List<Widget> get _list => (config().toursEntriesBuilder != null
      ? config().toursEntriesBuilder!(this)
      : [
          FirstTourPane(),

          // Account image
          AccountImageTourPane(
            user: currUser,
            onUpdated: setStateKeepCurrentIndex,
          ),

          // Notifications
          TourNotificationsPane(
            pushNotificationsKey: pushNotificationsKey,
            onConfigured: () => setState(() {}),
            onChanged: () => setState(() {}),
            visible: !areNotificationsConfigured,
          ),

          PresentationPane(
            icon: Icons.group_add,
            title: tr("Friends")!,
            text:
                "${tr("You can search the people you know and ask them to become your friends!")}\n\n${tr("This will help you to reach them to exchange information!")}",
          ),
          PresentationPane(
            icon: Icons.question_answer,
            title: tr("Conversations")!,
            text:
                "${tr("With Comunic, you can have conversations with all your friends.")}\n\n${tr("It is also possible to make video calls!")}",
          ),
          PresentationPane(
            icon: Icons.group,
            title: tr("Groups")!,
            text:
                "${tr("You can join groups where people share the same interests as you!")}\n\n${tr("It is also easy to create your own groups!")}",
          ),
          PresentationPane(
            icon: Icons.lock,
            title: tr("Privacy")!,
            text:
                "${tr("Your data is YOUR DATA. We will never use it or sell it.")}\n\n${tr("If you do not trust us, you can always check out our source code to verify it!")}",
          ),
          LastTourPane(),
        ])
    ..removeWhere((pane) {
      if (pane is PresentationPane) {
        PresentationPane p = pane;
        return !(p.visible ?? true);
      }
      return false;
    });

  @override
  Widget build(BuildContext context) => LoginRoutesTheme(
        child: Scaffold(
          body: SafeArea(
            child: AsyncScreenWidget(
              key: _key,
              onReload: _init,
              errorMessage: tr("Failed to load tour!")!,
              onBuild: () => DefaultTabController(
                initialIndex: _defaultIndex,
                length: _list.length,
                child: _RouteBody(
                  panes: _list,
                ),
              ),
            ),
          ),
        ),
      );
}

class _RouteBody extends StatefulWidget {
  final List<Widget>? panes;

  const _RouteBody({Key? key, this.panes}) : super(key: key);

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

class __RouteBodyState extends State<_RouteBody> {
  TabController? _controller;

  bool get _isLastPane => _controller!.index >= widget.panes!.length - 1;

  PresentationPane? get _currPane =>
      widget.panes![_controller!.index] is PresentationPane
          ? widget.panes![_controller!.index] as PresentationPane?
          : null;

  bool get _canGoNext => _currPane?.canGoNext ?? true;

  @override
  void didUpdateWidget(_RouteBody oldWidget) {
    super.didUpdateWidget(oldWidget);
    _updateController();
  }

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    _updateController();
  }

  void _updateController() {
    _controller = DefaultTabController.of(context);
    _controller!.addListener(() => setState(() {}));
  }

  @override
  Widget build(BuildContext context) => Padding(
        padding: const EdgeInsets.all(8.0),
        child: Column(
          children: <Widget>[
            Spacer(flex: 1),
            Expanded(
                child: TabBarView(
                  children: widget.panes!,
                  physics: NeverScrollableScrollPhysics(),
                ),
                flex: 10),
            Spacer(flex: 1),
            TabPageSelector(selectedColor: Colors.white),
            Spacer(flex: 1),
            OutlinedButton(
              onPressed: _canGoNext ? _nextOrFinish : null,
              child: Text(!_isLastPane ? tr("Next")! : tr("Let's go!")!),
            ),
            Spacer(flex: 1),
          ],
        ),
      );

  void _nextOrFinish() async {
    if (_controller!.indexIsChanging) return;

    if (!_isLastPane) {
      // Check if the next click has to be captured
      if (_currPane?.onTapNext != null) {
        if (!await _currPane!.onTapNext!(context)) return;
      }

      _controller!.animateTo(_controller!.index + 1);
    } else {
      (await PreferencesHelper.getInstance())!
          .setBool(PreferencesKeyList.IS_TOUR_SEEN, true);
      Navigator.of(context).pop();
    }
  }
}