FROM python:3.11-slim

# Set working directory
WORKDIR /app

# Create non-root user for security
RUN groupadd -r appuser && useradd -r -g appuser appuser

# Install system dependencies
RUN apt-get update && apt-get install -y \
    --no-install-recommends \
    && 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 main.py .

# Copy .env.example for reference (actual .env will be mounted at runtime)
COPY .env.example .

# Create input directory and set permissions
RUN mkdir -p /app/input && \
    chown -R appuser:appuser /app

# Switch to non-root user
USER appuser

# Expose port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD python -c "import requests; requests.get('http://localhost:8000/health')" || exit 1

# Run the application
CMD ["python", "-m", "uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]