import json
import logging
import urllib.error
import urllib.request

from ..config import settings

logger = logging.getLogger(__name__)


def get_ngrok_wss_base() -> str | None:
    """Detect ngrok public WSS base (test_bonvoice/outbound_call.py pattern)."""
    tunnel_hosts = ("127.0.0.1:4040", "host.docker.internal:4040")
    for host in tunnel_hosts:
        try:
            with urllib.request.urlopen(f"http://{host}/api/tunnels", timeout=2) as resp:
                data = json.load(resp)
            for tunnel in data.get("tunnels", []):
                public = tunnel.get("public_url", "")
                if public.startswith("https://"):
                    ngrok_host = public.removeprefix("https://")
                    return f"wss://{ngrok_host}/api/v1/voice"
        except (urllib.error.URLError, TimeoutError, json.JSONDecodeError, OSError):
            continue
    return None


def resolve_voice_relay_public_base() -> str:
    configured = settings.voice_relay_public_url.rstrip("/")
    if "localhost" in configured or "127.0.0.1" in configured:
        ngrok_base = get_ngrok_wss_base()
        if ngrok_base:
            logger.info("Using ngrok voice relay base: %s", ngrok_base)
            return ngrok_base
    return configured


def unified_voicebot_url() -> str:
    """Bonvoice outbound media URL (voicebotURL)."""
    return f"{resolve_voice_relay_public_base()}/ws/media"