import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';

import '../../../../api/marianumcloud/talk/room/get_room_response.dart';
import '../../../../api/marianumcloud/talk/room/notification_level.dart';
import '../../../../state/app/modules/chat_list/bloc/chat_list_bloc.dart';
import '../../../../widget/async_action_button.dart';
import '../../../../widget/details_bottom_sheet.dart';

extension NotificationLevelPresentation on NotificationLevel {
  // defaultLevel never reaches the UI (see effectiveNotificationLevel), but
  // the switch has to stay exhaustive.
  ({String label, String description, IconData icon}) get _presentation =>
      switch (this) {
        NotificationLevel.alwaysNotify || NotificationLevel.defaultLevel => (
          label: 'Alle Nachrichten',
          description: 'Bei jeder neuen Nachricht',
          icon: Icons.notifications_outlined,
        ),
        NotificationLevel.notifyOnMention => (
          label: 'Nur Erwähnungen',
          description: 'Nur wenn du erwähnt wirst',
          icon: Icons.alternate_email,
        ),
        NotificationLevel.neverNotify => (
          label: 'Aus',
          description: 'Keine Benachrichtigungen',
          icon: Icons.notifications_off_outlined,
        ),
      };

  String get label => _presentation.label;
  String get description => _presentation.description;
  IconData get icon => _presentation.icon;
}

/// Lets the user pick the room's Talk notification level. Nextcloud applies
/// it server-side, so no push for the room is sent at all when muted.
/// Returns the new level, or null when nothing changed.
Future<NotificationLevel?> showNotificationLevelSheet(
  BuildContext context,
  GetRoomResponseObject room, {
  required NotificationLevel current,
}) async {
  final bloc = context.read<ChatListBloc>();
  NotificationLevel? selected;
  await showDetailsBottomSheet(
    context,
    header: ListTile(
      leading: const Icon(Icons.notifications_outlined),
      title: const Text('Benachrichtigungen'),
      subtitle: Text(room.displayName, overflow: TextOverflow.ellipsis),
    ),
    children: (_) => [
      for (final level in selectableNotificationLevels)
        AsyncListTile(
          leading: Icon(
            level == current
                ? Icons.radio_button_checked
                : Icons.radio_button_unchecked,
          ),
          title: Text(level.label),
          subtitle: Text(level.description),
          onPressed: () async {
            if (level == current) return;
            await bloc.setNotificationLevel(room.token, level);
            selected = level;
          },
        ),
    ],
  );
  return selected;
}

class NotificationLevelTile extends StatelessWidget {
  final NotificationLevel level;
  final VoidCallback onTap;
  final Widget? trailing;

  const NotificationLevelTile({
    required this.level,
    required this.onTap,
    this.trailing,
    super.key,
  });

  @override
  Widget build(BuildContext context) => ListTile(
    leading: Icon(level.icon),
    title: const Text('Benachrichtigungen'),
    subtitle: Text(level.label),
    trailing: trailing,
    onTap: onTap,
  );
}