FROM python:3.11-slim

# HF Spaces requires a non-root user with uid 1000
RUN useradd -m -u 1000 user

# System deps for faiss + sentence-transformers
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential libgomp1 curl && \
    rm -rf /var/lib/apt/lists/*

USER user
ENV HOME=/home/user \
    PATH=/home/user/.local/bin:$PATH \
    PYTHONUNBUFFERED=1

WORKDIR $HOME/app

# Install CPU-only torch first (avoids downloading the huge CUDA build)
RUN pip install --no-cache-dir --user \
    torch --index-url https://download.pytorch.org/whl/cpu

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

# Copy application code
COPY --chown=user *.py ./
COPY --chown=user tool_schema.json ./

# Copy pre-built FAISS index (no Excel files needed at runtime)
COPY --chown=user index_cache/ ./index_cache/

EXPOSE 8000

CMD ["python", "main.py"]