# ========================================
# NestJS Backend Dockerfile
# ========================================
FROM node:20-alpine AS builder

WORKDIR /app

# 复制package文件
COPY package*.json ./

# 安装所有依赖（包括 devDependencies，用于构建）
RUN npm ci && npm cache clean --force

# 复制源码
COPY . .

# 构建应用
RUN npm run build

# 删除 devDependencies，只保留生产依赖
RUN npm prune --production

# ========================================
# Production Stage
# ========================================
FROM node:20-alpine

WORKDIR /app

# 复制依赖和构建产物
COPY --from=builder /app/node_modules ./node_modules
COPY --from=builder /app/dist ./dist
COPY --from=builder /app/package*.json ./

# 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)})"

# 启动应用
CMD ["node", "dist/main"]