FROM node:20-alpine AS deps
WORKDIR /app
COPY frontend/package.json ./
RUN npm install --no-audit --no-fund

FROM node:20-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY frontend/ ./
RUN npm run build

FROM node:20-alpine AS runner
WORKDIR /app
ENV NODE_ENV=production \
    PORT=3000 \
    HOSTNAME=0.0.0.0 \
    TZ=Asia/Seoul
COPY --from=builder /app/.next/standalone ./
COPY --from=builder /app/.next/static ./.next/static
COPY --from=builder /app/public ./public
EXPOSE 3000
HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
  CMD wget -q -O- http://127.0.0.1:3000/login >/dev/null 2>&1 || exit 1
CMD ["node", "server.js"]