# Multi-stage Dockerfile for Django production deployment

# Build stage
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
RUN apt-get update && apt-get install -y \
    build-essential \
    libpq-dev \
    curl \
    && curl -fsSL https://deb.nodesource.com/setup_18.x | bash - \
    && apt-get install -y nodejs \
    && rm -rf /var/lib/apt/lists/*

# Create and set work directory
WORKDIR /app

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

# Production stage
FROM python:3.11-slim

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    DJANGO_SETTINGS_MODULE=django_project.settings.production

# Install system dependencies for production
RUN apt-get update && apt-get install -y \
    libpq5 \
    curl \
    && curl -fsSL https://deb.nodesource.com/setup_18.x | bash - \
    && apt-get install -y nodejs \
    && rm -rf /var/lib/apt/lists/*

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

# Set work directory
WORKDIR /app

# Copy Python dependencies from builder stage
COPY --from=builder /usr/local/lib/python3.11/site-packages /usr/local/lib/python3.11/site-packages
COPY --from=builder /usr/local/bin /usr/local/bin

# Copy project files
COPY . .

# Install Tailwind and build CSS
RUN DJANGO_SETTINGS_MODULE=django_project.settings.build python manage.py tailwind install
RUN DJANGO_SETTINGS_MODULE=django_project.settings.build python manage.py tailwind build

# Create static and media directories
RUN mkdir -p staticfiles media

# Collect static files
RUN python manage.py collectstatic --noinput

# Change ownership to django user
RUN chown -R django:django /app

# Switch to non-root user
USER django

# Expose port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
    CMD python -c "import requests; requests.get('http://localhost:8000/health/', timeout=10)" || exit 1

# Start server
CMD ["gunicorn", "--bind", "0.0.0.0:8000", "--workers", "3", "--timeout", "120", "django_project.wsgi:application"]