FROM python:3.11-slim

WORKDIR /app

# Install system dependencies for audio processing
RUN apt-get update && apt-get install -y \
    ffmpeg \
    libsndfile1 \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements first for better caching
COPY requirements.txt .

# Install CPU-only PyTorch first (MUCH smaller than GPU version)
RUN pip install --no-cache-dir torch==2.1.2+cpu torchaudio==2.1.2+cpu -f https://download.pytorch.org/whl/cpu/torch_stable.html

# Install remaining requirements (skip torch/torchaudio since already installed)
RUN pip install --no-cache-dir -r requirements.txt || true

# Copy application code
COPY . .

# Expose port (documentary only, but good practice)
EXPOSE 8000

# Run the application using shell form to expand PORT variable
# Railway (and others) often inject a generic PORT variable
CMD ["sh", "-c", "uvicorn app.main:app --host 0.0.0.0 --port ${PORT:-7860}"]