# Multi-stage Dockerfile for Django application
# Stage 1: Builder stage - Install dependencies
FROM python:3.11-slim as builder

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1 \
    PIP_DISABLE_PIP_VERSION_CHECK=1

# Install system dependencies required for building Python packages
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc \
    postgresql-client \
    libpq-dev \
    && rm -rf /var/lib/apt/lists/*

# Create and set working directory
WORKDIR /app

# Copy requirements file
COPY requirements.txt .

# Install Python dependencies
RUN pip install --upgrade pip && \
    pip install --user -r requirements.txt

# Stage 2: Production stage - Minimal runtime image
FROM python:3.11-slim

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PATH="/home/django/.local/bin:$PATH"

# Install runtime dependencies only
RUN apt-get update && apt-get install -y --no-install-recommends \
    postgresql-client \
    libpq5 \
    bash \
    && rm -rf /var/lib/apt/lists/*

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

# Create necessary directories
RUN mkdir -p /app/staticfiles /app/media && \
    chown -R django:django /app

# Set working directory
WORKDIR /app

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

# Copy project files
COPY --chown=django:django . .

# Copy and set permissions for entrypoint script
COPY --chown=django:django entrypoint.sh /app/entrypoint.sh
RUN chmod +x /app/entrypoint.sh

# Switch to non-root user
USER django

# Expose port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
    CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:8000/api/')" || exit 1

# Use entrypoint script
ENTRYPOINT ["/app/entrypoint.sh"]

# Default command (can be overridden in docker-compose)
CMD ["gunicorn", "zonco_backend.wsgi:application", "--bind", "0.0.0.0:8000", "--workers", "3", "--timeout", "120"]