import os
from .log import log

_whisper_model = None


def cuda_available():
    try:
        import ctranslate2
        return ctranslate2.get_cuda_device_count() > 0
    except Exception as e:
        log.info("ctranslate2_cuda_probe_failed", err=str(e))
        return False


def whisper_model():
    global _whisper_model
    if _whisper_model is None:
        from faster_whisper import WhisperModel
        name = os.environ.get("WHISPER_MODEL", "small.en")
        cache = os.environ.get("WHISPER_CACHE", "/var/lib/void/whisper-models")
        device = "cuda" if cuda_available() else "cpu"
        compute_type = "float16" if device == "cuda" else "int8"
        log.info("whisper_loading", model=name, device=device,
                 compute_type=compute_type, cache=cache)
        _whisper_model = WhisperModel(
            name, device=device, compute_type=compute_type, download_root=cache
        )
    return _whisper_model


def whisper_transcribe(audio_path):
    segments, _info = whisper_model().transcribe(audio_path, vad_filter=True)
    return "\n".join(s.text.strip() for s in segments).strip()