# Use Python 3.9 slim image for better performance
FROM python:3.11-slim

# Set environment variables
ENV PYTHONUNBUFFERED=1
ENV PYTHONDONTWRITEBYTECODE=1
ENV HF_HOME=/tmp/huggingface
ENV TRANSFORMERS_CACHE=/tmp/huggingface/transformers
ENV TORCH_HOME=/tmp/torch

# Create a non-root user (required for HF Spaces)
RUN useradd -m -u 1000 user
USER user
ENV HOME=/home/user
ENV PATH=/home/user/.local/bin:$PATH

# Set working directory
WORKDIR $HOME/app

# Install system dependencies (as root)
USER root
RUN apt-get update && apt-get install -y \
    build-essential \
    curl \
    git \
    && rm -rf /var/lib/apt/lists/*

# Switch back to user
USER user

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

# Download spaCy model
RUN python -m spacy download en_core_web_sm

# Copy application code
COPY --chown=user . .

# Create cache directories
RUN mkdir -p /tmp/huggingface/transformers
RUN mkdir -p /tmp/torch

# Expose port
EXPOSE 7860

# Health check
HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:7860/ || exit 1

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