# Build stage
FROM node:18-alpine AS builder

WORKDIR /app

# Copy package files
COPY package*.json ./

# Install dependencies
RUN npm install

# Copy source code
COPY . .

# Build production bundle with optimizations
RUN NODE_ENV=production npm run build

# Production stage - minimal footprint
FROM node:18-alpine

WORKDIR /app

# Install serve for static file serving
RUN npm install -g serve@14

# Copy built app from builder
COPY --from=builder /app/build ./build

EXPOSE 3000

# Health check
HEALTHCHECK --interval=10s --timeout=5s --retries=5 \
  CMD wget --quiet --tries=1 --spider http://localhost:3000/ || exit 1

# Start server with gzip compression
CMD ["serve", "-s", "build", "-l", "3000", "--gzip"]