# Multi-stage production Dockerfile for Next.js standalone

# Stage 1: Dependencies
FROM node:22-alpine AS deps
RUN npm install -g bun
WORKDIR /app
COPY package.json bun.lock ./
RUN bun install --frozen-lockfile

# Stage 2: Build
FROM node:22-alpine AS build
RUN npm install -g bun
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN bun run build

# Stage 3: Runtime
FROM node:22-alpine AS runner
WORKDIR /app

# Create non-root user
RUN adduser --system --uid 1001 nextjs

# Copy standalone build output
COPY --from=build --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=build --chown=nextjs:nodejs /app/.next/static ./.next/static
COPY --from=build --chown=nextjs:nodejs /app/public ./public

# Switch to non-root user
USER nextjs

EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD node -e "require('http').get('http://localhost:3000', (r) => {if (r.statusCode !== 200) throw new Error(r.statusCode)})"

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