import { defineConfig, externalizeDepsPlugin } from 'electron-vite';
import react from '@vitejs/plugin-react';
import tailwindcss from '@tailwindcss/vite';
import { resolve } from 'path';
import { readFileSync } from 'fs';

// P2-12: 从 package.json 读取版本号，构建期注入渲染进程（StatusBar 兜底显示）
const pkg = JSON.parse(readFileSync(resolve(__dirname, 'package.json'), 'utf-8')) as { version: string };

export default defineConfig({
  main: {
    plugins: [externalizeDepsPlugin()],
    build: {
      outDir: 'dist-electron/main',
      rollupOptions: {
        input: { main: resolve(__dirname, 'electron/main.ts') },
      },
    },
  },
  preload: {
    plugins: [externalizeDepsPlugin()],
    build: {
      outDir: 'dist-electron/preload',
      rollupOptions: {
        input: { preload: resolve(__dirname, 'electron/preload.ts') },
      },
    },
  },
  renderer: {
    root: '.',
    plugins: [react(), tailwindcss()],
    define: {
      __APP_VERSION__: JSON.stringify(pkg.version),
    },
    resolve: {
      alias: {
        '@renderer': resolve(__dirname, 'src'),
        '@shared': resolve(__dirname, 'electron/harness/types'),
      },
    },
    build: {
      outDir: 'dist',
      rollupOptions: {
        input: { main: resolve(__dirname, 'index.html') },
        output: {
          // v0.5.0: 代码分割 — 此前全部打进单个 2.6MB chunk，首屏加载随业务代码线性膨胀。
          // 拆出稳定的第三方 vendor chunk（缓存友好：业务代码变更不再使整个 bundle 失效）
          manualChunks(id: string): string | undefined {
            if (!id.includes('node_modules')) return undefined;
            // React 运行时 + 状态管理
            if (/[\\/]node_modules[\\/](react|react-dom|scheduler|zustand)[\\/]/.test(id)) {
              return 'vendor-react';
            }
            // MUI 组件体系 + Emotion 样式引擎
            if (id.includes('@mui') || id.includes('@emotion')) {
              return 'vendor-mui';
            }
            // Markdown 渲染链（react-markdown/remark/rehype/micromark/highlight.js 等）
            if (
              /(react-markdown|remark-|rehype-|micromark|mdast-|unified|unist-|hast-|highlight\.js|lowlight|vfile|trough|bail)/.test(
                id,
              )
            ) {
              return 'vendor-markdown';
            }
            // 图标库（lucide 按需引入但仍占可观体积）
            if (id.includes('lucide-react')) {
              return 'vendor-icons';
            }
            return undefined;
          },
        },
      },
    },
  },
});