FROM python:3.11-slim

WORKDIR /app

# Install dependencies first (cached layer)
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy application code
COPY models.py .
COPY tasks.py .
COPY graders.py .
COPY environment.py .
COPY app.py .
COPY server/ ./server/

# HF Spaces expects port 7860
EXPOSE 7860

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD python -c "import requests; requests.get('http://localhost:7860/health').raise_for_status()"

# Run the server
CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]