FROM python:3.11-slim

ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1 \
    HOST=0.0.0.0 \
    PORT=7860 \
    ATLAS_DATA_ROOT=/data \
    HF_HOME=/data/hf-cache \
    LOCAL_FILES_ONLY=false \
    TOKENIZERS_PARALLELISM=false \
    HF_HUB_DISABLE_TELEMETRY=1 \
    TORCH_NUM_THREADS=2 \
    EMBED_BATCH_SIZE=2 \
    RERANK_BATCH_SIZE=1 \
    RERANK_POOL=15 \
    FINAL_SOURCES=5 \
    QUERY_EXPANSION_ENABLED=false

RUN apt-get update \
    && apt-get install -y --no-install-recommends libgomp1 \
    && rm -rf /var/lib/apt/lists/*

RUN useradd -m -u 1000 user
WORKDIR /home/user/app

COPY requirements.txt ./requirements.txt

RUN python -m pip install --upgrade pip wheel setuptools \
    && python -m pip install "torch==2.12.1" --index-url https://download.pytorch.org/whl/cpu \
    && python -m pip install -r requirements.txt

COPY --chown=user:user . /home/user/app
USER user

EXPOSE 7860

CMD ["gunicorn", "--bind", "0.0.0.0:7860", "--workers", "1", "--threads", "4", "--timeout", "900", "--access-logfile", "-", "--error-logfile", "-", "app:app"]