"""
In-app notification service.

Creates notification records for the notification centre.
Separate from ntfy push — in-app notifications are always created;
ntfy push is gated by per-type toggles.
"""
from typing import Optional
from sqlalchemy.ext.asyncio import AsyncSession
from app.models.notification import Notification


async def create_notification(
    db: AsyncSession,
    user_id: int,
    type: str,
    title: str,
    message: str,
    data: Optional[dict] = None,
    source_type: Optional[str] = None,
    source_id: Optional[int] = None,
) -> Notification:
    """Create an in-app notification. Does NOT commit — caller handles transaction."""
    notification = Notification(
        user_id=user_id,
        type=type,
        title=title,
        message=message,
        data=data,
        source_type=source_type,
        source_id=source_id,
    )
    db.add(notification)
    return notification