# 阶段1: 依赖安装
FROM node:20-alpine AS deps
RUN apk add --no-cache libc6-compat
WORKDIR /app

# 复制依赖文件 (lock文件可选，首次构建会自动生成)
COPY package.json ./
COPY package-lock.json* ./

# 安装依赖 (有lock文件用ci，没有则用install)
RUN if [ -f package-lock.json ]; then npm ci; else npm install; fi

# 阶段2: 构建
FROM node:20-alpine AS builder
WORKDIR /app

# 复制依赖
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# 设置环境变量
ENV NEXT_TELEMETRY_DISABLED=1
ENV NODE_ENV=production

# 构建应用
RUN npm run build

# 阶段3: 生产运行
FROM node:20-alpine AS runner
WORKDIR /app

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1

# 安装 curl 用于健康检查
RUN apk add --no-cache curl

# 创建非 root 用户
RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs

# 复制构建产物
COPY --from=builder /app/public ./public
COPY --from=builder /app/.next/standalone ./
COPY --from=builder /app/.next/static ./.next/static

# 设置权限
USER nextjs

# 暴露端口
EXPOSE 3000

ENV PORT=3000
ENV HOSTNAME="0.0.0.0"

# 启动应用
CMD ["node", "server.js"]
