# Hugging Face Spaces (Docker SDK) image for the romance chat app.
FROM python:3.11-slim

# System deps: git for HF model downloads, build tools for sentencepiece.
RUN apt-get update && apt-get install -y --no-install-recommends \
        git build-essential \
    && rm -rf /var/lib/apt/lists/*

# HF Spaces runs containers as a non-root user (uid 1000). Match that so the
# app can write its per-session data and model cache.
RUN useradd -m -u 1000 user
USER user

ENV HOME=/home/user \
    PATH=/home/user/.local/bin:$PATH \
    PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1 \
    HF_HOME=/home/user/.cache/huggingface \
    STREAMLIT_SERVER_HEADLESS=true \
    STREAMLIT_BROWSER_GATHER_USAGE_STATS=false

WORKDIR /home/user/app

# Install the CPU build of torch explicitly (the default PyPI wheel is CUDA and huge).
RUN pip install --upgrade pip && \
    pip install --user torch==2.6.0 --index-url https://download.pytorch.org/whl/cpu

COPY --chown=user requirements.txt .
RUN pip install --user -r requirements.txt

COPY --chown=user . .

EXPOSE 7860

# HF Spaces expects the app on the port declared as app_port in README.md (7860).
CMD ["sh", "-c", "streamlit run core/app.py --server.port=${PORT:-7860} --server.address=0.0.0.0 --server.enableCORS=false --server.enableXsrfProtection=false"]