# ---- deps: full install (devDeps needed for the build) ----
FROM node:20-alpine AS deps
WORKDIR /app
COPY package.json package-lock.json ./
RUN npm ci

# ---- builder: webpack build (same command as npm run build) ----
FROM node:20-alpine AS builder
WORKDIR /app
ENV NEXT_TELEMETRY_DISABLED=1
ENV NODE_OPTIONS=--max-old-space-size=1536
# Build-time only: satisfies env fail-fast during page-data collection.
# The runner MUST get a real SESSION_SECRET at deploy time.
ENV SESSION_SECRET=build-only-placeholder-not-a-real-secret
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build && npm prune --omit=dev

# ---- runner: standalone server + traced node_modules only ----
FROM node:20-alpine AS runner
WORKDIR /app
ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1
ENV NODE_OPTIONS=--max-old-space-size=512
ENV PORT=3000
ENV HOSTNAME=0.0.0.0
# Low-RAM MySQL defaults (override per deploy): small pool, quick idle reap.
ENV DB_POOL_LIMIT=5
ENV DB_POOL_MAX_IDLE=2
ENV DB_POOL_IDLE_TIMEOUT_MS=60000
RUN addgroup -S app && adduser -S app -G app
COPY --from=builder --chown=app:app /app/.next/standalone ./
COPY --from=builder --chown=app:app /app/.next/static ./.next/static
COPY --from=builder --chown=app:app /app/public ./public
USER app
EXPOSE 3000
HEALTHCHECK --interval=30s --timeout=5s --retries=3 \
  CMD wget -q -O /dev/null http://127.0.0.1:3000/api/v1/health || exit 1
CMD ["node", "server.js"]