FROM python:3.11-slim

# Set working directory
WORKDIR /app

# Set environment variables
ENV PYTHONPATH=/app
ENV PYTHONUNBUFFERED=1
ENV PORT=8000
# Set Hugging Face and Sentence Transformers cache directories
ENV HF_HOME=/app/.cache/huggingface
ENV TRANSFORMERS_CACHE=/app/.cache/huggingface
ENV SENTENCE_TRANSFORMERS_HOME=/app/.cache/sentence_transformers

# Install system dependencies
RUN apt-get update && apt-get install -y \
    gcc \
    g++ \
    libmagic1 \
    curl \
    && rm -rf /var/lib/apt/lists/*

# Create cache directories with proper permissions
RUN mkdir -p /app/.cache/huggingface /app/.cache/sentence_transformers && chmod -R 777 /app/.cache

# Copy requirements first for better caching
COPY requirements.txt .

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

# Copy application code and model files
COPY . .

# Ensure model directory has proper permissions
RUN chmod -R 777 /app/models

# Expose port
EXPOSE $PORT

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

# Run the application
CMD ["sh", "-c", "uvicorn rag:app --host 0.0.0.0 --port $PORT"]