FROM python:3.10-slim

# Install system dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    libpq-dev \
    && rm -rf /var/lib/apt/lists/*

# Hugging Face Spaces requires non-root user UID 1000
RUN useradd -m -u 1000 user
USER user
ENV PATH="/home/user/.local/bin:$PATH"

WORKDIR /app

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

# Copy source code
COPY --chown=user src/ ./src/

# Download embedding + reranker models at build time
# so the first request is fast (no cold start download)
COPY --chown=user download_models.py .
RUN python download_models.py

ENV PYTHONUNBUFFERED=1
ENV PYTHONPATH=/app

# Hugging Face Spaces requires port 7860
EXPOSE 7860

CMD ["uvicorn", "src.main:app", "--host", "0.0.0.0", "--port", "7860"]