Dockerfile.prod

# Multi-stage Dockerfile for Balancer Application
# Produces a single image with Django backend serving the React frontend

# Stage 1: Build Frontend
FROM node:18 AS frontend-builder

WORKDIR /frontend

# Copy frontend package files
COPY frontend/package*.json ./

# Install dependencies
RUN npm ci --legacy-peer-deps

# Copy frontend source
COPY frontend/ ./

# Build frontend - outputs to dist/ as configured in vite.config.ts
RUN npm run build

# Stage 2: Build Backend
FROM python:3.11.4-slim-bullseye

# Receive version argument from build command
ARG VERSION
ENV VERSION=${VERSION}

# Set work directory
WORKDIR /usr/src/app

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

# Install system dependencies
RUN apt-get update && apt-get install -y netcat && rm -rf /var/lib/apt/lists/*

# Install Python dependencies
RUN pip install --upgrade pip --no-cache-dir
COPY server/requirements.txt .
# Install CPU-only torch to save space (avoids ~4GB of CUDA libs)
RUN pip install torch --index-url https://download.pytorch.org/whl/cpu --no-cache-dir
RUN pip install -r requirements.txt --no-cache-dir

# Copy backend application code
COPY server/ .

# Copy frontend build from frontend-builder stage to where Django expects it
COPY --from=frontend-builder /frontend/dist ./build

# Expose port
EXPOSE 8000

# Run entrypoint
ENTRYPOINT ["./entrypoint.prod.sh"]

# Start gunicorn
CMD ["python", "manage.py", "runserver", "0.0.0.0:8000", "--noreload"]