# frontend/Dockerfile — phase-15 멀티스테이지(Next.js standalone)
FROM node:20-slim AS deps
WORKDIR /app
RUN corepack enable
COPY package.json pnpm-lock.yaml ./
RUN pnpm install --frozen-lockfile

FROM node:20-slim AS builder
WORKDIR /app
RUN corepack enable
COPY --from=deps /app/node_modules ./node_modules
COPY . .
ENV NEXT_TELEMETRY_DISABLED=1
RUN pnpm build

FROM node:20-slim AS runtime
WORKDIR /app
ENV NODE_ENV=production NEXT_TELEMETRY_DISABLED=1 PORT=3000
RUN useradd -m -u 10002 web
# next.config 에 output:"standalone" 필요(없으면 .next 전체 복사로 대체)
COPY --from=builder --chown=web:web /app/.next/standalone ./
COPY --from=builder --chown=web:web /app/.next/static ./.next/static
COPY --from=builder --chown=web:web /app/public ./public
USER web
EXPOSE 3000
CMD ["node", "server.js"]