FROM python:3.10-slim

# Install system deps
RUN apt-get update && apt-get install -y --no-install-recommends \
    ffmpeg \
    git \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /app

# Set Hugging Face cache to a writable directory
ENV HF_HOME=/app/hf_cache

# Copy requirements first
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Pre-cache Hugging Face models (avoid cold starts)
RUN python -c "from transformers import Wav2Vec2Processor, AutoModelForAudioClassification; \
    Wav2Vec2Processor.from_pretrained('facebook/wav2vec2-base-960h', cache_dir='/app/hf_cache'); \
    AutoModelForAudioClassification.from_pretrained('prithivMLmods/Common-Voice-Gender-Detection', cache_dir='/app/hf_cache')"

# Copy app
COPY app.py .

# Expose the port Hugging Face assigns (default 7860)
EXPOSE 7860

# Run uvicorn, binding to $PORT injected by Hugging Face
CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]