import base64
import os
import httpx

MODAL_ENDPOINT = os.environ.get("MODAL_ENDPOINT_WHISPER", "")
MODAL_AUTH_TOKEN = os.environ.get("MODAL_AUTH_TOKEN", "")


def transcribe(audio_path: str) -> str | None:
    if not MODAL_ENDPOINT:
        raise RuntimeError("MODAL_ENDPOINT_WHISPER not set")

    with open(audio_path, "rb") as f:
        b64 = base64.b64encode(f.read()).decode()

    resp = httpx.post(
        MODAL_ENDPOINT,
        json={"audio_base64": b64, "token": MODAL_AUTH_TOKEN},
        timeout=30,
    )
    resp.raise_for_status()
    return resp.json().get("text")