FROM python:3.11-slim

# System deps for matplotlib, OR-Tools, and general build
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# HF Spaces requires running as non-root user with UID 1000
RUN useradd -m -u 1000 user
USER user
ENV PATH="/home/user/.local/bin:$PATH"
WORKDIR /home/user/app

# Install Python deps first (for Docker layer caching)
COPY --chown=user requirements.txt requirements.txt
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt

# Copy app files, data, and pre-computed artifacts
COPY --chown=user . .

# Streamlit must listen on 0.0.0.0:7860 for HF Spaces
EXPOSE 7860

CMD ["streamlit", "run", "app.py", \
     "--server.port=7860", \
     "--server.address=0.0.0.0", \
     "--server.headless=true", \
     "--server.enableCORS=false", \
     "--server.enableXsrfProtection=false", \
     "--browser.gatherUsageStats=false"]