"""
API Dependencies — Shared dependency injection for all routes.
"""

from fastapi import Depends, HTTPException, Request
from sqlalchemy.ext.asyncio import AsyncSession

from core.gateway import AIPSTNGateway
from db.database import get_db


def get_gateway(request: Request) -> AIPSTNGateway:
    """Get the gateway instance from app state."""
    gateway = getattr(request.app.state, "gateway", None)
    if gateway is None:
        raise HTTPException(status_code=503, detail="Gateway not initialized")
    return gateway