# apps/common/services/notification_service.py
import logging
from asgiref.sync import async_to_sync
from channels.layers import get_channel_layer
from apps.notification.models import Notification

logger = logging.getLogger(__name__)

class NotificationService:
    def send_notification(self, user, title, content, notification_type, related_object_id, sender=None):
        """发送通知并通过WebSocket推送"""
        try:
            notification = Notification.objects.create(
                sender=sender,
                receiver=user,
                title=title,
                content=content,
                type=notification_type,
                related_resource=related_object_id,
            )

            # 准备发送到WebSocket的数据
            notification_data = {
                "id": str(notification.id),
                "title": notification.title,
                "content": notification.content,
                "type": notification.type,
                "created_at": notification.created_at.isoformat(),
            }
            
            # 只有当sender不为None时才添加sender信息
            if notification.sender:
                notification_data["sender"] = {
                    "id": str(notification.sender.id),
                    "name": notification.sender.name
                }

            channel_layer = get_channel_layer()
            async_to_sync(channel_layer.group_send)(
                f"notification_user_{user.id}",
                {
                    "type": "notification",
                    "data": notification_data
                }
            )
            return notification
        except Exception as e:
            logger.error(f"发送通知失败: {str(e)}")
            return None