FROM python:3.12-slim

WORKDIR /app

# Install dependencies first for layer caching — rebuild only when requirements.txt changes
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

COPY . .

EXPOSE 8501

HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
    CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:8501/_stcore/health')" || exit 1

CMD ["streamlit", "run", "app.py", \
     "--server.address=0.0.0.0", \
     "--server.headless=true", \
     "--server.port=8501"]
