reschedule method

Implementation

Future<void> reschedule() async {
  try {
    final service = _ref.read(notificationServiceProvider);
    if (service == null) return;
    final ds = _ref.read(supabaseDatasourceProvider);

    final prefsJson = await ds.getNotificationPreferences();
    final prefs = NotificationPreferences.fromJson(prefsJson);

    // Daily reminder
    if (prefs.dailyReminderEnabled) {
      final dueCount = await ds.getDueCardCount();
      await service.scheduleDailyReminder(
        hour: prefs.dailyReminderHour,
        minute: prefs.dailyReminderMinute,
        dueCardCount: dueCount,
      );
    } else {
      await service.cancel(NotificationIds.dailyReminder);
    }

    // Streak alert
    if (prefs.streakAlertEnabled) {
      final dates = await ds.getSessionDates(limit: 90);
      final streak = StreakCalculator.currentStreak(dates);
      if (streak > 0) {
        // Only schedule if user hasn't studied today
        final today = DateTime.now();
        final todayDate = DateTime(today.year, today.month, today.day);
        final studiedToday = dates.isNotEmpty && dates.first == todayDate;
        if (!studiedToday) {
          await service.scheduleStreakAlert(currentStreak: streak);
        } else {
          await service.cancel(NotificationIds.streakAlert);
        }
      } else {
        await service.cancel(NotificationIds.streakAlert);
      }
    } else {
      await service.cancel(NotificationIds.streakAlert);
    }

    // Overdue warning
    if (prefs.overdueAlertEnabled) {
      final nextReview = await ds.getNextReviewDate();
      if (nextReview != null) {
        await service.scheduleOverdueWarning(
          nextReviewDate: nextReview,
          thresholdDays: prefs.overdueThresholdDays,
        );
      } else {
        await service.cancel(NotificationIds.overdueWarning);
      }
    } else {
      await service.cancel(NotificationIds.overdueWarning);
    }
  } catch (e) {
    dev.log(
      'Failed to reschedule notifications: $e',
      name: 'NotificationScheduler',
    );
  }
}