# 阶段 1: 依赖安装和构建
FROM node:18-alpine AS deps
WORKDIR /app

# 复制 package.json 和 package-lock.json (如果可用)
COPY package.json package-lock.json* ./

# 安装依赖
RUN npm ci

# 阶段 2: 构建应用
FROM node:18-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# 构建应用
RUN npm run build

# 阶段 3: 运行
FROM node:18-alpine AS runner
WORKDIR /app

ENV NODE_ENV production

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

COPY --from=builder /app/public ./public

# 自动利用输出跟踪来减少镜像大小
# https://nextjs.org/docs/advanced-features/output-file-tracing
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

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