FROM python:3.9-slim

WORKDIR /app

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

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

# Set environment variables for Hugging Face
ENV HF_HOME=/tmp/hf_cache
ENV TOKENIZERS_PARALLELISM=false

# Create cache directories and make them writable by any user
RUN mkdir -p /tmp/hf_cache && chmod -R 777 /tmp/hf_cache

# Create a non-root user (HF Spaces convention)
RUN useradd -m -u 1000 user
ENV HOME=/home/user

# Copy application code
COPY app.py .

# Make sure the non-root user owns the app directory
RUN chown -R user:user /app

USER user

# Expose port 7860 for Hugging Face Spaces
EXPOSE 7860

# Run with gunicorn: single worker (model is loaded once, in-process;
# multiple workers would each load their own copy of the model into memory)
CMD ["gunicorn", "--bind", "0.0.0.0:7860", "--workers", "1", "--threads", "4", "--timeout", "120", "app:app"]