FROM node:22-alpine AS base

# --- deps: install production-resolvable dependencies once -------------------
FROM base AS deps
WORKDIR /app
COPY package.json package-lock.json ./
RUN npm ci

# --- builder: compile the Next.js standalone bundle --------------------------
FROM base AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
ENV NEXT_TELEMETRY_DISABLED=1
RUN npm run build

# --- runner: minimal runtime image -------------------------------------------
FROM base AS runner
WORKDIR /app

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1
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
# standalone already contains the pruned node_modules and server.js
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

USER nextjs
EXPOSE 3000

# Used by compose's healthcheck and by scripts/update.sh for rollback detection
HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
  CMD node -e "fetch('http://127.0.0.1:3000/api/health').then(r=>process.exit(r.ok?0:1)).catch(()=>process.exit(1))"

CMD ["node", "server.js"]