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(),
    ...(process.env.BUNDLE_VISUALIZE
      ? [visualizer({ filename: 'dist/stats.json', template: 'raw-data', gzipSize: true })]
      : []),
  ],
  server: {
    port: 3002,
    proxy: {
      '/api': {
        target: 'http://localhost:3000',
        changeOrigin: true,
      },
    },
  },
  build: {
    // 稳定 vendor 分包：大库单独成 chunk，利于浏览器缓存与按需加载
    rolldownOptions: {
      output: {
        codeSplitting: {
          groups: [
            {
              name: (id) => {
                if (!id.includes('node_modules')) return null;
                // 只对体积大且相互独立的纯库手动分组；antd/markdown 栈
                // 交给 rolldown 默认分包，避免人为制造超大 chunk。
                if (/[\\/]node_modules[\\/](echarts|zrender)[\\/]/.test(id)) return 'echarts';
                if (/[\\/]node_modules[\\/](react|react-dom|react-router|react-router-dom|scheduler|use-sync-external-store)[\\/]/.test(id)) return 'react';
                if (/[\\/]node_modules[\\/]dayjs[\\/]/.test(id)) return 'dayjs';
                if (/[\\/]node_modules[\\/]@tanstack[\\/]/.test(id)) return 'tanstack';
                return null;
              },
            },
          ],
        },
      },
    },
    // 剩余大 chunk 均为按需加载（AI 绘图/ECharts 等），阈值按实际调高避免误报
    chunkSizeWarningLimit: 700,
  },
  optimizeDeps: {
    include: [
      'dayjs',
      'dayjs/locale/zh-cn',
      'dayjs/plugin/customParseFormat',
      'dayjs/plugin/advancedFormat',
      'dayjs/plugin/weekday',
      'dayjs/plugin/localeData',
      'dayjs/plugin/weekOfYear',
      'dayjs/plugin/weekYear',
      'dayjs/plugin/updateLocale',
      'antd/es/locale/zh_CN',
    ],
  },
});