import { defineConfig } from 'vite';
import react from '@vitejs/plugin-react';
import { visualizer } from 'rollup-plugin-visualizer';

// https://vite.dev/config/
export default defineConfig({
  plugins: [
    react(),
    
    // Bundle 分析工具（通过 ANALYZE=true 环境变量启用）
    process.env.ANALYZE === 'true' && visualizer({
      open: true,
      filename: 'dist/stats.html',
      gzipSize: true,
      brotliSize: true,
      template: 'treemap',
    }),
  ].filter(Boolean),

  build: {
    // Enable minification for production builds (Req 13.9)
    // Vite 8+ uses oxc by default; 'esbuild' requires a separate install.
    // Leaving minify at its default ('oxc' in Vite 8) gives fast, aggressive
    // minification out of the box.
    // minify: 'esbuild',  // uncomment if esbuild is installed separately

    // Raise the warning threshold slightly – Ant Design + Slate are large
    // but are split into their own vendor chunk below.
    chunkSizeWarningLimit: 600,

    rollupOptions: {
      output: {
        /**
         * 优化的 Manual chunk splitting 策略
         *
         * 将 Ant Design 拆分为多个更小的 chunks，提高缓存命中率
         * 并独立打包大型文档处理库
         */
        manualChunks(id: string) {
          // ========== React 核心框架 ==========
          if (id.includes('node_modules/react') || id.includes('node_modules/react-dom')) {
            return 'react-vendor';
          }

          // ========== Ant Design 细粒度拆分 ==========
          // 核心组件（高频使用，首屏必需）
          if (
            id.includes('node_modules/antd/es/button') ||
            id.includes('node_modules/antd/es/input') ||
            id.includes('node_modules/antd/es/space') ||
            id.includes('node_modules/antd/es/spin') ||
            id.includes('node_modules/antd/es/typography') ||
            id.includes('node_modules/antd/es/config-provider') ||
            id.includes('node_modules/antd/es/alert')
          ) {
            return 'antd-core';
          }

          // 表单和反馈组件（中频使用）
          if (
            id.includes('node_modules/antd/es/message') ||
            id.includes('node_modules/antd/es/popconfirm') ||
            id.includes('node_modules/antd/es/tooltip') ||
            id.includes('node_modules/antd/es/select')
          ) {
            return 'antd-feedback';
          }

          // 布局和导航组件（中频使用）
          if (
            id.includes('node_modules/antd/es/drawer') ||
            id.includes('node_modules/antd/es/list') ||
            id.includes('node_modules/antd/es/card') ||
            id.includes('node_modules/antd/es/divider') ||
            id.includes('node_modules/antd/es/empty')
          ) {
            return 'antd-layout';
          }

          // 数据展示组件（低频使用，按需加载）
          if (
            id.includes('node_modules/antd/es/tree') ||
            id.includes('node_modules/antd/es/table') ||
            id.includes('node_modules/antd/es/dropdown')
          ) {
            return 'antd-data';
          }

          // 其他 Ant Design 代码（图标、样式、工具等）
          if (id.includes('node_modules/antd') || id.includes('node_modules/@ant-design')) {
            return 'antd-vendor';
          }

          // ========== 文档处理库（按需加载）==========
          if (
            id.includes('node_modules/mammoth') ||
            id.includes('node_modules/docx-preview')
          ) {
            return 'document-libs';
          }

          // ========== 导出功能库（按需加载）==========
          if (
            id.includes('node_modules/jspdf') ||
            id.includes('node_modules/html2canvas')
          ) {
            return 'export-libs';
          }

          // ========== Markdown 处理库 ==========
          if (
            id.includes('node_modules/react-markdown') ||
            id.includes('node_modules/remark-') ||
            id.includes('node_modules/rehype-') ||
            id.includes('node_modules/turndown') ||
            id.includes('node_modules/unified') ||
            id.includes('node_modules/micromark')
          ) {
            return 'markdown-vendor';
          }

          // ========== Slate 编辑器 ==========
          if (
            id.includes('node_modules/slate') ||
            id.includes('node_modules/slate-react') ||
            id.includes('node_modules/slate-history')
          ) {
            return 'slate-vendor';
          }

          // ========== 工具库 ==========
          if (
            id.includes('node_modules/axios') ||
            id.includes('node_modules/zustand') ||
            id.includes('node_modules/uuid')
          ) {
            return 'utils-vendor';
          }

          // 其他 node_modules
          if (id.includes('node_modules')) {
            return 'vendor';
          }
        },
      },
      // Rollup performs tree-shaking by default when building ES modules.
      // These options reinforce that unused exports are dropped (Req 13.9).
      treeshake: {
        moduleSideEffects: false,
        propertyReadSideEffects: false,
      },
    },

    // 启用 CSS 代码分割
    cssCodeSplit: true,

    // 小于此阈值的资源将内联为 base64
    assetsInlineLimit: 4096, // 4KB
  },

  // 开发服务器配置
  server: {
    port: 5173,
    host: true,
    open: false,
  },

  // 依赖预构建优化
  optimizeDeps: {
    include: [
      'react',
      'react-dom',
      'axios',
      'zustand',
      'antd',
      '@ant-design/icons',
    ],
    // 排除不需要预构建的大型依赖
    exclude: [
      'mammoth',
      'docx-preview',
    ],
  },
});