FROM python:3.10-slim

ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1 \
    HF_HOME=/home/user/.cache/huggingface \
    SENTENCE_TRANSFORMERS_HOME=/home/user/.cache/huggingface \
    STREAMLIT_SERVER_HEADLESS=true \
    STREAMLIT_BROWSER_GATHERUSAGESTATS=false

RUN apt-get update && apt-get install -y --no-install-recommends \
        build-essential \
        git \
    && rm -rf /var/lib/apt/lists/*

# HF Spaces convention: run as non-root user 1000
RUN useradd -m -u 1000 user
USER user
ENV PATH="/home/user/.local/bin:${PATH}"
WORKDIR /home/user/app

COPY --chown=user requirements.txt ./
RUN pip install --user --upgrade pip && \
    pip install --user --no-cache-dir -r requirements.txt

COPY --chown=user . ./

# Pre-warm the embedding model at build time so first request is fast and
# doesn't hit a cold HF download from inside the running container.
RUN python -c "from sentence_transformers import SentenceTransformer; SentenceTransformer('BAAI/bge-small-en-v1.5')"

EXPOSE 7860

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