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

WORKDIR /app

COPY package.json package-lock.json* ./
RUN npm ci --legacy-peer-deps

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

WORKDIR /app

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

# Build args for environment variables baked at build time
ARG NEXT_PUBLIC_API_URL=http://localhost: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
ENV NEXT_TELEMETRY_DISABLED=1

RUN addgroup --system --gid 1001 nodejs && \
    adduser --system --uid 1001 nextjs

# Copy only what's needed for production
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

ENV PORT=3000
ENV HOSTNAME="0.0.0.0"

HEALTHCHECK --interval=30s --timeout=10s --start-period=20s --retries=3 \
    CMD wget -qO- http://localhost:3000/ || exit 1

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