# ── Stage 1: deps ─────────────────────────────────────────────────────────────
FROM node:20-alpine AS deps

WORKDIR /app
COPY package.json package-lock.json* ./
RUN npm ci

# ── Stage 2: build ────────────────────────────────────────────────────────────
FROM node:20-alpine AS builder

WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# NEXT_PUBLIC_API_URL is baked in at build time via docker-compose build args
ARG NEXT_PUBLIC_API_URL=http://backend:8000
ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL

RUN npm run build

# ── Stage 3: runtime ──────────────────────────────────────────────────────────
FROM node:20-alpine AS runtime

WORKDIR /app
ENV NODE_ENV=production

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

EXPOSE 3000

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