# ---------- build ----------
FROM docker.io/node:20-alpine AS builder
WORKDIR /app

# install deps (needs dev deps for build)
COPY package*.json ./
RUN npm ci

# app source
COPY . .

# disable telemetry; let Next control NODE_ENV during build
ENV NEXT_TELEMETRY_DISABLED=1

# Build-time environment variables for Next.js public config
ARG NEXT_PUBLIC_API_HOST=127.0.0.1
ARG NEXT_PUBLIC_API_PORT=3001
ENV NEXT_PUBLIC_API_HOST=${NEXT_PUBLIC_API_HOST}
ENV NEXT_PUBLIC_API_PORT=${NEXT_PUBLIC_API_PORT}

RUN npm run build

# ---------- runner (standalone) ----------
FROM docker.io/node:20-alpine AS runner
WORKDIR /app

# runtime env
ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1
ENV PORT=3000
ENV HOSTNAME=127.0.0.1

# minimal probe tool
RUN apk add --no-cache wget

# copy standalone artifacts
COPY --from=builder /app/public ./public
COPY --from=builder /app/.next/standalone ./
COPY --from=builder /app/.next/static ./.next/static

# non-root (optional)
RUN addgroup --system --gid 1001 nodejs \
 && adduser  --system --uid 1001 nextjs \
 && chown -R nextjs:nodejs /app
USER nextjs

EXPOSE 3000

# healthcheck (no /api prefix)
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD wget -qO- http://127.0.0.1:${PORT}/ >/dev/null 2>&1 || exit 1

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