# Multi-stage build for smaller image size
FROM python:3.11-slim as builder

WORKDIR /app

# Install build dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc \
    && rm -rf /var/lib/apt/lists/*

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

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

# Final stage
FROM python:3.11-slim

# Create non-root user for security
RUN useradd -m -u 1000 appuser

WORKDIR /app

# Copy Python dependencies from builder
COPY --from=builder /root/.local /home/appuser/.local

# Copy application code
COPY --chown=appuser:appuser . .

# Make sure scripts are executable (if you have any)
# RUN chmod +x entrypoint.sh

# Switch to non-root user
USER appuser

# Add user's local bin to PATH
ENV PATH=/home/appuser/.local/bin:$PATH

# Environment variables
ENV FLASK_APP=app.py
ENV FLASK_RUN_HOST=0.0.0.0
ENV PORT=5000
ENV PYTHONUNBUFFERED=1

# Health check - Docker level (optional, Nomad will also check)
HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
  CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:${PORT}/health')" || exit 1

# Expose port (documentation only)
EXPOSE 5000

# Command to run the application
CMD ["sh", "-c", "flask run --port ${PORT}"]