# 多阶段构建 Dockerfile

# 构建阶段
FROM node:20-alpine AS builder

WORKDIR /app

# 复制 package 文件
COPY package*.json ./

# 安装依赖
RUN npm install

# 复制源代码
COPY . .

# 构建应用
RUN npm run build

# 生产阶段
FROM node:20-alpine

WORKDIR /app

# 创建非 root 用户
RUN addgroup -g 1001 -S nodejs && \
    adduser -S nestjs -u 1001

# 从构建阶段复制文件
COPY --from=builder --chown=nestjs:nodejs /app/dist ./dist
COPY --from=builder --chown=nestjs:nodejs /app/node_modules ./node_modules
COPY --from=builder --chown=nestjs:nodejs /app/package*.json ./

# 切换用户
USER nestjs

# 暴露端口
EXPOSE 3000

# 健康检查
HEALTHCHECK --interval=30s --timeout=3s --start-period=40s \
  CMD node -e "require('http').get('http://localhost:3000/health', (r) => {process.exit(r.statusCode === 200 ? 0 : 1)})"

# 启动命令
CMD ["node", "dist/main"]