FROM python:3.10-slim

# Set working directory
WORKDIR /app

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

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

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

# Copy application code
COPY . .

# Create cache directory for models
RUN mkdir -p /app/.cache/models

# Download the model during build to cache it
RUN python -c "from sentence_transformers import CrossEncoder; CrossEncoder('cross-encoder/ms-marco-MiniLM-L-6-v2', cache_folder='/app/.cache/models')"

# Create a non-root user to run the application
RUN useradd -m -u 1000 appuser && \
    chown -R appuser:appuser /app

# Switch to non-root user
USER appuser

# Expose port
EXPOSE 8080

# Set environment variables
ENV PYTHONUNBUFFERED=1
ENV MODEL_CACHE_DIR=/app/.cache/models

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
    CMD curl -f http://localhost:8080/health || exit 1

# Run the application
CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "8080", "--workers", "1"]