"""Request-scoped dependencies shared by the routers."""
from __future__ import annotations

import psycopg
from fastapi import HTTPException, Request

from .auth import Ctx
from .config import Config
from .db import connect


def get_cfg(request: Request) -> Config:
    return request.app.state.cfg


def get_ctx(request: Request):
    cfg: Config = request.app.state.cfg
    try:
        conn = connect(cfg)
    except psycopg.Error:
        # A transient DB outage must degrade to 503, not kill the server.
        raise HTTPException(503, "database unavailable, try again shortly")
    try:
        yield Ctx(cfg, conn)
    finally:
        conn.close()