FROM python:3.11-slim

WORKDIR /app

# Install system dependencies (for numpy/scikit-learn)
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# Copy and install Python dependencies
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy application code
COPY . .

# Environment variables
ENV OPENBLAS_NUM_THREADS=1
ENV OMP_NUM_THREADS=1
ENV PREWARM_CACHE=1
ENV PYTHONUNBUFFERED=1

# Health check
HEALTHCHECK --interval=30s --timeout=5s --retries=3 \
    CMD python3 -c "import urllib.request; urllib.request.urlopen('http://localhost:5000/health')" || exit 1

# Run with Gunicorn
CMD ["gunicorn", "app:app", \
     "--workers", "4", \
     "--timeout", "120", \
     "--bind", "0.0.0.0:5000", \
     "--access-logfile", "-", \
     "--error-logfile", "-"]