"""Rate limiter keyed by X-API-Key (or IP if missing). Used by main and routes."""
from app.config import get_rate_limit_per_minute
from slowapi import Limiter
from slowapi.util import get_remote_address


def _key_func(request) -> str:
    api_key = request.headers.get("X-API-Key") or get_remote_address(request)
    return str(api_key)


limiter = Limiter(key_func=_key_func)


def rate_limit_string() -> str:
    """e.g. '60/minute' from config."""
    n = get_rate_limit_per_minute()
    return f"{n}/minute"