"""HTTP client for external programs calling notify-gateway."""
import httpx


class NotifyClient:
    def __init__(self, base_url: str, token: str, timeout: float = 20.0) -> None:
        self.base_url = base_url.rstrip("/")
        self.token = token
        self.timeout = timeout

    async def send(self, title: str, text: str, channels: list[str],
                   telegram_bot: str = "",
                   idempotency_key: str = "",
                   images: list[dict] | None = None) -> dict:
        if not channels:
            raise ValueError("channels must explicitly select at least one channel")
        if "telegram" in channels and not telegram_bot.strip():
            raise ValueError("telegram_bot is required for Telegram delivery")
        payload = {"title": title, "text": text, "channels": channels}
        if "telegram" in channels:
            payload["telegram_bot"] = telegram_bot.strip()
        if images:
            payload["images"] = images
        if idempotency_key:
            payload["idempotency_key"] = idempotency_key
        async with httpx.AsyncClient(timeout=self.timeout, trust_env=False) as client:
            r = await client.post(
                f"{self.base_url}/send",
                headers={"Authorization": f"Bearer {self.token}"},
                json=payload,
            )
            r.raise_for_status()
            data = r.json()
            if not data.get("ok"):
                raise RuntimeError(f"notify-gateway delivery incomplete: {data.get('results', {})}")
            return data