import logging
from urllib.parse import urlparse

from aiohttp_socks import ProxyConnector, ProxyType

from config import PROXY_ENABLED, PROXY_URL

logger = logging.getLogger(__name__)


def get_proxy_connector() -> ProxyConnector | None:
    """Create an aiohttp SOCKS5 proxy connector from PROXY_URL if enabled."""
    if not PROXY_ENABLED or not PROXY_URL:
        return None

    parsed = urlparse(PROXY_URL)

    if parsed.scheme not in ("socks5", "socks5h"):
        logger.warning("Unsupported proxy scheme: %s", parsed.scheme)
        return None

    host = parsed.hostname
    port = parsed.port
    if not host or not port:
        logger.warning("Invalid proxy URL: missing host or port")
        return None

    username = parsed.username
    password = parsed.password

    try:
        return ProxyConnector(
            proxy_type=ProxyType.SOCKS5,
            host=host,
            port=port,
            username=username,
            password=password,
        )
    except Exception as exc:
        logger.error("Failed to create proxy connector: %s", exc)
        return None