"""
Shared extension instances (rate limiter, etc.) to avoid circular imports.
"""

from starlette.requests import Request
from slowapi import Limiter

from app.config import settings


def _get_real_client_ip(request: Request) -> str:
    """Extract real client IP from X-Forwarded-For (behind Cloudflare/nginx) or fallback."""
    forwarded = request.headers.get("X-Forwarded-For")
    if forwarded:
        return forwarded.split(",")[0].strip()
    cf_ip = request.headers.get("CF-Connecting-IP")
    if cf_ip:
        return cf_ip.strip()
    return request.client.host if request.client else "127.0.0.1"


limiter = Limiter(key_func=_get_real_client_ip, default_limits=[settings.RATE_LIMIT_DEFAULT])