# Multi-stage build for optimal image size
FROM node:18-alpine AS builder

WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production

# Copy source code
COPY . .

# Build application
RUN npm run build

# Production stage
FROM node:18-alpine AS production

# Create app user
RUN addgroup -g 1001 -S nodejs
RUN adduser -S nextjs -u 1001

WORKDIR /app

# Copy built application
COPY --from=builder --chown=nextjs:nodejs /app/dist ./dist
COPY --from=builder /app/node_modules ./node_modules
COPY --from=builder /app/package.json ./package.json

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD curl -f http://localhost:3000/health || exit 1

USER nextjs

EXPOSE 3000

ENV NODE_ENV=production
ENV PORT=3000

CMD ["npm", "start"]