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FROM python:3.9-slim

WORKDIR /app

# Install system dependencies
RUN apt-get update && apt-get install -y \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# Create directories with secure permissions
RUN mkdir -p cache/huggingface vector_store chat_history \
    && chown -R 1000:1000 . \
    && chmod -R 755 .

# Copy dependencies separately for caching
COPY requirements.txt .

# Install Python dependencies
RUN pip install --no-cache-dir -r requirements.txt

# Copy source code
COPY . .

# Set environment variables
ENV HF_HOME=/app/cache/huggingface
ENV HUGGINGFACE_HUB_CACHE=/app/cache/huggingface
ENV XDG_CACHE_HOME=/app/cache

# Set permissions (only for newly created files)
RUN chown -R 1000:1000 /app \
    && find /app -type d -exec chmod 755 {} \; \
    && find /app -type f -exec chmod 644 {} \;

# Run as non-privileged user
USER 1000

EXPOSE 8000

CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "8000"]