FROM python:3.11-slim

# Set environment system variables
ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    HOME=/home/user

# Create app directory and safe system user
RUN useradd -m -u 1000 user
WORKDIR $HOME/app

# Install system dependencies if native extensions need compilation
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# Switch to non-root privileges
USER user
ENV PATH=/home/user/.local/bin:$PATH

# Install Python requirements
COPY --chown=user requirements.txt .
RUN pip install --no-cache-dir --user -r requirements.txt

# Copy application files
COPY --chown=user . .

# Hugging Face Spaces environment contract requires port 7860
EXPOSE 7860

CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860", "--workers", "2"]