import os
from typing import Optional, Dict, Any

def get_telegram_proxy() -> Optional[Dict[str, Any]]:
    # Only enable proxy if TELEGRAM_PROXY_ENABLE is 'true'
    enable = os.getenv("TELEGRAM_PROXY_ENABLE", "false").lower() in ("true", "1", "yes")
    if not enable:
        return None

    proxy_host = os.getenv("TELEGRAM_PROXY_HOST", "host.docker.internal" if os.path.exists("/app") else "127.0.0.1")
    proxy_port = os.getenv("TELEGRAM_PROXY_PORT", "10809")
    proxy_type = os.getenv("TELEGRAM_PROXY_TYPE", "http").lower()

    if not proxy_host or not proxy_port:
        return None

    try:
        import python_socks
        ptype = python_socks.ProxyType.HTTP if proxy_type == "http" else python_socks.ProxyType.SOCKS5
        return {
            "proxy_type": ptype,
            "addr": proxy_host,
            "port": int(proxy_port)
        }
    except Exception:
        return None