import 'package:comunic/helpers/independent_push_notifications_helper.dart';
import 'package:comunic/helpers/push_notifications_helper.dart';
import 'package:comunic/helpers/server_config_helper.dart';
import 'package:comunic/models/config.dart';
import 'package:comunic/ui/widgets/async_screen_widget.dart';
import 'package:comunic/utils/flutter_utils.dart';
import 'package:comunic/utils/intl_utils.dart';
import 'package:comunic/utils/log_utils.dart';
import 'package:comunic/utils/ui_utils.dart';
import 'package:flutter/material.dart';

/// Push notifications configuration route
///
/// @author Pierre Hubert

Future<void> showInitialPushNotificationsConfiguration(
    BuildContext context) async {
  // Check if no notifications service are available
  if (!PushNotificationsHelper.arePushNotificationsAvailable) return;

  await Navigator.of(context).push(
      MaterialPageRoute(builder: (c) => PushNotificationsConfigurationRoute()));
}

class PushNotificationsConfigurationRoute extends StatefulWidget {
  @override
  _PushNotificationsConfigurationRouteState createState() =>
      _PushNotificationsConfigurationRouteState();
}

class _PushNotificationsConfigurationRouteState
    extends State<PushNotificationsConfigurationRoute> {
  PushNotificationsStatus currStatus;

  bool get canSubmit =>
      (currStatus ?? PushNotificationsStatus.UNDEFINED) !=
      PushNotificationsStatus.UNDEFINED;

  Future<void> _refresh() async {
    await PushNotificationsHelper.refreshLocalStatus();
    currStatus = await PushNotificationsHelper.getLocalStatus();
  }

  @override
  Widget build(BuildContext context) {
    return Material(
        color: config().splashBackgroundColor,
        child: Center(
          child: Padding(
            padding: const EdgeInsets.all(8.0),
            child: AsyncScreenWidget(
              onReload: _refresh,
              onBuild: _buildForm,
              errorMessage: tr("Failed to load push notifications settings!"),
            ),
          ),
        ));
  }

  Widget _buildForm() => ConstrainedBox(
        constraints: BoxConstraints(maxWidth: 300),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Spacer(),
            Icon(Icons.notifications_none),
            Spacer(),
            Text(
              tr("Comunic can now send you notifications to your device when the application is closed if you want."),
              textAlign: TextAlign.center,
            ),
            Spacer(),
            _NotificationOption(
              title: tr("Use Google services"),
              description: tr(
                  "Use the Google Play services to send you notifications. This option is less privacy-friendly, but it will work on most phones and will save your battery life."),
              option: PushNotificationsStatus.FIREBASE,
              current: currStatus,
              available: srvConfig.notificationsPolicy.hasFirebase,
              onChanged: (s) => setState(() => currStatus = s),
            ),
            _NotificationOption(
              title: tr("Use independent notifications service"),
              description: tr(
                  "Configure Comunic to use your own self-hosted notifications service. This option is much more privacy-friendly, but it will drain your battery life."),
              option: PushNotificationsStatus.INDEPENDENT,
              current: currStatus,
              available:
                  srvConfig.notificationsPolicy.hasIndependent && isAndroid,
              onChanged: (s) => setState(() => currStatus = s),
            ),
            _NotificationOption(
              title: tr("Do not send notification"),
              description: tr(
                  "Disable notifications services. You will always be able to change it from application settings."),
              option: PushNotificationsStatus.DISABLED,
              current: currStatus,
              available: true,
              onChanged: (s) => setState(() => currStatus = s),
            ),
            Spacer(),
            OutlinedButton(
                onPressed: canSubmit ? _submit : null,
                child: Text(tr("Configure").toUpperCase()),
                style: OutlinedButton.styleFrom(primary: Colors.white)),
            Spacer(),
          ],
        ),
      );

  Future<void> _submit() async {
    try {
      switch (currStatus) {
        case PushNotificationsStatus.DISABLED:
          break;

        case PushNotificationsStatus.FIREBASE:
          // TODO: Handle this case.
          throw new Exception("Firebase not supported yet!");
          break;

        case PushNotificationsStatus.INDEPENDENT:
          await IndependentPushNotificationsHelper.preConfigure();
          break;

        default:
          throw new Exception("Unknown status!");
      }

      await PushNotificationsHelper.clearLocalStatus();
      await PushNotificationsHelper.setNewStatus(currStatus);
      await PushNotificationsHelper.refreshLocalStatus();

      Navigator.of(context).pop();
    } catch (e, s) {
      logError(e, s);
      showAlert(
          context: context,
          message: tr("Failed to configure push notifications!"));
    }
  }
}

class _NotificationOption extends StatelessWidget {
  final String title;
  final String description;
  final PushNotificationsStatus option;
  final PushNotificationsStatus current;
  final bool available;
  final Function(PushNotificationsStatus) onChanged;

  const _NotificationOption({
    Key key,
    @required this.title,
    @required this.description,
    @required this.option,
    @required this.current,
    @required this.available,
    @required this.onChanged,
  })  : assert(title != null),
        assert(description != null),
        assert(option != null),
        assert(current != null),
        assert(available != null),
        assert(onChanged != null),
        super(key: key);

  @override
  Widget build(BuildContext context) => !available
      ? Container()
      : Theme(
          data: Theme.of(context).copyWith(
            splashColor: Colors.transparent,
            highlightColor: Colors.transparent,
          ),
          child: ListTile(
            leading: Radio(
              value: option,
              groupValue: current,
              onChanged: onChanged,
            ),
            title: Text(title),
            subtitle: Text(description),
            contentPadding: EdgeInsets.all(0),
            onTap: () => onChanged(option),
          ),
        );
}