# ── Stage 1: Install dependencies ──
FROM node:20-alpine AS deps
RUN apk add --no-cache libc6-compat
WORKDIR /app

COPY package.json package-lock.json* ./
RUN npm install

# ── Stage 2: Build the Next.js app ──
FROM node:20-alpine AS builder
WORKDIR /app

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

# Build args become env vars at build time
ARG NEXT_PUBLIC_API_URL=/api
ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL
ENV NEXT_TELEMETRY_DISABLED=1
ENV NODE_ENV=production

RUN npm run build

# ── Stage 3: Production runner ──
FROM node:20-alpine 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 standalone output (includes server.js + required node_modules)
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

# The standalone output provides its own minimal server
CMD ["node", "server.js"]
