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app/services/notification_service.py

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+from __future__ import annotations
+
+from app.communication.socketio.server import sio
+from app.models.mongodb.notification import Notification
+
+
+class NotificationService:
+    async def create_notification(
+        self, user_id: int, title: str, message: str, notification_type: str = "info"
+    ) -> Notification:
+        notification = Notification(
+            user_id=user_id,
+            title=title,
+            message=message,
+            notification_type=notification_type,
+        )
+        await notification.insert()
+
+        await sio.emit(
+            "notification",
+            {"title": title, "message": message, "type": notification_type},
+            room=f"user:{user_id}",
+            namespace="/notification",
+        )
+
+        return notification
+
+    async def get_user_notifications(
+        self, user_id: int, skip: int = 0, limit: int = 20, unread_only: bool = False
+    ) -> list[Notification]:
+        query: dict = {"user_id": user_id}
+        if unread_only:
+            query["is_read"] = False
+        return await (
+            Notification.find(query)
+            .sort("-created_at")
+            .skip(skip)
+            .limit(limit)
+            .to_list()
+        )
+
+    async def mark_as_read(self, notification_id: str, user_id: int) -> None:
+        from datetime import datetime
+
+        notification = await Notification.get(notification_id)
+        if notification and notification.user_id == user_id:
+            notification.is_read = True
+            notification.read_at = datetime.utcnow()
+            await notification.save()