feat(backend): migrate auth and notifications off email

apps/events/api/views.py

@@ -1,3 +1,4 @@
+from django.conf import settings
 from django.shortcuts import get_object_or_404
 from django.db.models import Q, Case, When, IntegerField
 from django.utils.text import slugify
@@ -25,11 +26,52 @@ from apps.events.api.schemas import (
 )
 from core.authentication import jwt_auth
 from apps.events.models import Event, Registration
+from apps.notifications.services import notify_user
 from apps.payments.models import DiscountCode
+from apps.users.tasks import send_critical_sms
 from core.api.schemas import ErrorSchema, MessageSchema
 
 events_router = Router()
 
+
+def _frontend_event_url(event: Event) -> str:
+    root = getattr(settings, "FRONTEND_ROOT", "/") or "/"
+    if not root.endswith("/"):
+        root = f"{root}/"
+    return f"{root}events/{event.slug or event.id}"
+
+
+def _notify_event_update(
+    event: Event,
+    *,
+    notification_type: str,
+    title: str,
+    message: str,
+    level: str,
+    sms_kind: str | None = None,
+):
+    recipients = (
+        Registration.objects.filter(event=event, is_deleted=False)
+        .exclude(status=Registration.StatusChoices.CANCELLED)
+        .select_related("user")
+    )
+    for registration in recipients:
+        notify_user(
+            registration.user_id,
+            {
+                "type": notification_type,
+                "title": title,
+                "message": message,
+                "level": level,
+                "action_url": _frontend_event_url(event),
+                "entity_type": "event",
+                "entity_id": event.id,
+                "meta": {"event_status": event.status},
+            },
+        )
+        if sms_kind and registration.user.mobile and registration.user.is_mobile_verified:
+            send_critical_sms.delay(registration.user.mobile, sms_kind, event.title)
+
 # Event endpoints
 @events_router.get("/", response=List[EventListSchema])
 def list_events(
@@ -103,6 +145,14 @@ def create_event(request, payload: EventCreateSchema):
 def update_event(request, event_id: int, payload: EventUpdateSchema):
     """Update an existing event"""
     event = get_object_or_404(Event, id=event_id, is_deleted=False)
+    previous_state = {
+        "status": event.status,
+        "start_time": event.start_time,
+        "end_time": event.end_time,
+        "address": event.address,
+        "location": event.location,
+        "online_link": event.online_link,
+    }
 
     update_data = payload.dict(exclude_unset=True)
     gallery_image_ids = update_data.pop('gallery_image_ids', None)
@@ -118,6 +168,34 @@ def update_event(request, event_id: int, payload: EventUpdateSchema):
     if gallery_image_ids is not None:
         event.gallery_images.set(gallery_image_ids)
 
+    schedule_changed = any(
+        previous_state[field] != getattr(event, field)
+        for field in ("start_time", "end_time", "address", "location", "online_link")
+    )
+    cancelled_now = (
+        previous_state["status"] != Event.StatusChoices.CANCELLED
+        and event.status == Event.StatusChoices.CANCELLED
+    )
+
+    if cancelled_now:
+        _notify_event_update(
+            event,
+            notification_type="event_cancelled",
+            title=f"رویداد {event.title} لغو شد",
+            message="این رویداد لغو شده است. برای جزئیات بیشتر صفحه رویداد را بررسی کنید.",
+            level="warning",
+            sms_kind="event_cancellation",
+        )
+    elif schedule_changed:
+        _notify_event_update(
+            event,
+            notification_type="event_rescheduled",
+            title=f"زمان یا محل {event.title} تغییر کرد",
+            message="جزئیات زمان‌بندی یا محل برگزاری این رویداد به‌روزرسانی شده است.",
+            level="info",
+            sms_kind="event_reschedule",
+        )
+
     return event
 
 @events_router.delete("/{int:event_id}", response=MessageSchema)