FROM python:3.11-slim

# Set working directory
WORKDIR /app

# Install system dependencies (including libxml2 and libxslt for lxml)
RUN apt-get update && apt-get install -y \
    build-essential \
    curl \
    git \
    libxml2-dev \
    libxslt1-dev \
    zlib1g-dev \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements
COPY requirements.txt .

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

# Copy application code
COPY . .

# Create cache directory for models with proper permissions
RUN mkdir -p /app/models_cache && chmod 777 /app/models_cache

# Expose port (HuggingFace uses port 7860 by default)
EXPOSE 7860

# Set environment variables
ENV PORT=7860
ENV PYTHONUNBUFFERED=1
ENV TRANSFORMERS_CACHE=/app/models_cache
ENV HF_HOME=/app/models_cache

# Run with Gunicorn for production stability and timeout handling
CMD ["gunicorn", "--bind", "0.0.0.0:7860", "--workers", "1", "--threads", "4", "--timeout", "300", "--graceful-timeout", "300", "--keep-alive", "5", "combined_server:app"]