الحفلات المتكررة: جدولة الرحلات الأسبوعية والشهرية باستخدام قواعد iCalendar

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RRULE:FREQ=WEEKLY;BYDAY=MO,WE,FR
  ← كل إثنين وأربعاء وجمعة

RRULE:FREQ=MONTHLY;BYDAY=1SA
  ← أول سبت من كل شهر

RRULE:FREQ=WEEKLY;INTERVAL=2;BYDAY=SU
  ← كل أحد بالتناوب

RRULE:FREQ=DAILY;COUNT=10
  ← يومياً لمدة 10 مرات

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class RecurringParty(models.Model):
    name = models.CharField(max_length=255)

    # Schedule configuration
    start_date = models.DateField()
    end_date = models.DateField(null=True, blank=True)
    max_occurrences = models.PositiveIntegerField(null=True, blank=True)
    recurrence = RecurrenceField()  # RRULE pattern

    # Template fields (copied to each instance)
    departure_time = models.TimeField()
    arrival_time = models.TimeField()
    origin = PointField()
    destination = PointField()
    route = models.JSONField()
    difficulty = models.CharField(choices=DIFFICULTY_CHOICES)
    # ... other party attributes

    is_active = models.BooleanField(default=True)

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class Party(models.Model):
    # Existing fields...

    # Recurring party support
    scheduled_date = models.DateField(null=True, blank=True)
    recurring_parent = models.ForeignKey(
        RecurringParty,
        on_delete=models.SET_NULL,
        null=True,
        related_name="instances"
    )
    is_cancelled = models.BooleanField(default=False)

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def generate_instances(self, lookahead_days: int = 30) -> list[Party]:
    """Generate party instances for upcoming occurrences."""
    occurrences = self.recurrence.between(
        datetime.now().date(),
        datetime.now().date() + timedelta(days=lookahead_days),
    )

    created = []
    for date in occurrences:
        # Skip if instance already exists
        if self.instances.filter(scheduled_date=date).exists():
            continue

        # Create new party instance from template
        party = Party.objects.create(
            name=f"{self.name} - {date.strftime('%B %d')}",
            scheduled_date=date,
            recurring_parent=self,
            departure_time=self.departure_time,
            arrival_time=self.arrival_time,
            origin=self.origin,
            destination=self.destination,
            route=self.route,
            # ... copy other template fields
        )
        created.append(party)

    return created

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@shared_task
def generate_recurring_party_instances():
    """Generate party instances for all active recurring parties."""
    for recurring_party in RecurringParty.objects.filter(is_active=True):
        created = recurring_party.generate_instances(lookahead_days=30)
        if created:
            logger.info(
                f"Generated {len(created)} instances for {recurring_party.name}"
            )

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CELERY_BEAT_SCHEDULE = {
    "generate-recurring-party-instances": {
        "task": "party_onbici.apps.party.tasks.generate_recurring_party_instances",
        "schedule": crontab(hour=0, minute=0),  # Daily at midnight
    },
}

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class RecurringPartyForm(forms.ModelForm):
    recurrence = RecurrenceField(
        label="Recurrence pattern",
        help_text="Set up when this party should repeat.",
        required=True,
    )

    class Meta:
        model = RecurringParty
        fields = [
            "name", "start_date", "end_date", "recurrence",
            "departure_time", "arrival_time",
            "origin", "destination", "description",
            "difficulty", "gender", "privacy",
        ]

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# Generate instances using timezone-aware dates
local_tz = get_current_timezone()
today = timezone.now().astimezone(local_tz).date()

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party = recurring_party.instances.get(scheduled_date=holiday_date)
party.is_cancelled = True
party.save()

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def form_valid(self, form):
    delete_instances = request.POST.get("delete_instances") == "true"

    if delete_instances:
        # Soft-delete future instances
        recurring_party.instances.filter(
            scheduled_date__gte=date.today(),
            deleted_at__isnull=True,
        ).update(deleted_at=timezone.now())

    recurring_party.delete()