import os
from typing import Dict, Tuple

from app.services.http_client import HttpxClient


_clients: Dict[tuple, HttpxClient] = {}


def _proxies_key(proxies: Dict[str, str]) -> Tuple[Tuple[str, str], Tuple[str, str]]:
    if not proxies:
        return tuple(), tuple()
    # Separate http/https for stable key
    items = sorted((proxies or {}).items())
    return tuple(items), tuple(items)


def get_http_client(proxies: Dict[str, str]) -> HttpxClient:
    # Determine HTTP/2 enablement from env (default on)
    http2_env = os.environ.get('WHOOGLE_HTTP2', '1').lower()
    http2_enabled = http2_env in ('1', 'true', 't', 'yes', 'y')

    key = (_proxies_key(proxies or {}), http2_enabled)
    client = _clients.get(key)
    if client is not None:
        return client
    client = HttpxClient(proxies=proxies or None, http2=http2_enabled)
    _clients[key] = client
    return client


def close_all_clients() -> None:
    for client in list(_clients.values()):
        try:
            client.close()
        except Exception:
            pass
    _clients.clear()