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FROM python:3.11-slim

# Set environment variables
ENV PYTHONUNBUFFERED=1 \
    GENAI_PORT=7860 \
    HOME=/home/user

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

# Create a non-root user (required by Hugging Face Spaces)
RUN useradd -m -u 1000 user
WORKDIR /app

# Install CPU-only PyTorch first to reduce container size and build time
RUN pip install --no-cache-dir torch --index-url https://download.pytorch.org/whl/cpu

# Copy and install requirements
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy the rest of the application files
COPY --chown=user:user . .
RUN chown -R user:user /app

# Switch to the non-root user
USER user

# Run the model download script during build so the space starts up instantly
RUN python download_model.py

# Expose the default Hugging Face Space port
EXPOSE 7860

# Run the Flask app
CMD ["python", "genai_app.py"]