# Stage 1: Build React frontend
FROM node:18-slim AS frontend-builder
WORKDIR /app/frontend

# Copy package.json ONLY and install dependencies from scratch
# This avoids issues with lock files generated on different OS (e.g. Windows -> Linux)
COPY frontend/package.json ./
RUN npm install

# Copy rest of the frontend code and build
COPY frontend/ .
RUN npm run build

# Stage 2: Setup Node.js backend and serve everything
FROM node:18-slim
WORKDIR /app

# Copy package.json ONLY and install production dependencies from scratch
COPY backend/package.json ./
RUN npm install --omit=dev

# Copy rest of the backend code
COPY backend/ .

# Copy built frontend assets from the previous stage
COPY --from=frontend-builder /app/frontend/dist ./public

# The port the backend runs on
EXPOSE 3001

# Start the server
CMD ["node", "server.js"]