FROM node:20-alpine AS deps
WORKDIR /app
COPY package.json package-lock.json ./
# npm ci is stricter than local macOS npm; install keeps Linux Docker builds reliable.
RUN npm install

FROM node:20-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
ENV NEXT_TELEMETRY_DISABLED=1
# Next.js evaluates API routes at build time; auth-secret throws without JWT_SECRET.
ENV JWT_SECRET=build-time-placeholder-replaced-at-runtime
RUN npm run build

FROM node:20-alpine AS runner
WORKDIR /app
ENV NODE_ENV=production
ENV PORT=3000
ENV HOSTNAME=0.0.0.0

RUN addgroup --system --gid 1001 nodejs && adduser --system --uid 1001 nextjs

COPY --from=builder /app/public ./public
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

USER nextjs
EXPOSE 3000
CMD ["node", "server.js"]