"""Whisper transcription service for VoIdeaAI.

Used as fallback when browser Web Speech API fails.
Supports OpenAI Whisper API and compatible endpoints.
"""

import tempfile
from pathlib import Path

import httpx

from app.core.config import get_settings

WHISPER_URL = "https://api.openai.com/v1/audio/transcriptions"


async def transcribe(audio_data: bytes, filename: str = "audio.webm") -> str | None:
    """Transcribe audio using Whisper API.

    Args:
        audio_data: Raw audio bytes
        filename: Original filename (determines format)

    Returns:
        Transcribed text or None if failed
    """
    settings = get_settings()

    api_key = settings.openai_api_key or settings.ai_yandex_key or ""
    if not api_key:
        return None

    url = WHISPER_URL

    with tempfile.NamedTemporaryFile(delete=False, suffix=Path(filename).suffix) as tmp:
        tmp.write(audio_data)
        tmp_path = tmp.name

    try:
        async with httpx.AsyncClient(timeout=30.0) as client:
            with open(tmp_path, "rb") as f:
                resp = await client.post(
                    url,
                    headers={"Authorization": f"Bearer {api_key}"},
                    files={"file": (filename, f, "audio/webm")},
                    data={"model": "whisper-1", "language": "ru"},
                )
            if resp.status_code == 200:
                return resp.json().get("text")
            return None
    except Exception:
        return None
    finally:
        Path(tmp_path).unlink(missing_ok=True)