import vue from "@vitejs/plugin-vue";
import type { PluginOption } from "vite";
import { type ConfigEnv, type UserConfig, loadEnv, defineConfig } from "vite";

import AutoImport from "unplugin-auto-import/vite";
import Components from "unplugin-vue-components/vite";
import type { ComponentResolverObject } from "unplugin-vue-components";
import { ElementPlusResolver } from "unplugin-vue-components/resolvers";

import { mockDevServerPlugin } from "vite-plugin-mock-dev-server";

import UnoCSS from "unocss/vite";
import { resolve } from "path";
import fs from "node:fs";
import { name, version } from "./package.json" with { type: "json" };

// 平台名称、版本信息
const __APP_INFO__ = {
  pkg: { name, version },
  buildTimestamp: Date.now(),
};

// ESM 模式下使用 import.meta.dirname（Node 20.11+）
const pathSrc = resolve(import.meta.dirname, "src");

// Vite配置  https://cn.vitejs.dev/config
export default defineConfig(async ({ mode }: ConfigEnv): Promise<UserConfig> => {
  const env = loadEnv(mode, process.cwd());
  // 生成 Element Plus 组件样式预构建清单（resolver 驱动）
  const elementPlusStyleImports = await collectElementPlusStyleImports();

  return {
    resolve: {
      alias: {
        "@": pathSrc,
      },
    },
    css: {
      preprocessorOptions: {
        // 注入项目布局变量。
        scss: {
          additionalData: `@use "@/styles/variables.scss" as *;`,
        },
      },
    },
    server: {
      host: "0.0.0.0",
      port: +env.VITE_APP_PORT,
      open: true,
      proxy: {
        [env.VITE_APP_BASE_API]: {
          changeOrigin: true,
          target: env.VITE_APP_API_URL,
          rewrite: (path: string) => path.replace(new RegExp(`^${env.VITE_APP_BASE_API}`), ""),
        },
      },
    },
    plugins: [
      vue(),
      ...(env.VITE_MOCK_DEV_SERVER === "true" ? [mockDevServerPlugin()] : []),
      UnoCSS(),
      // API 自动导入
      AutoImport({
        // 导入 Vue 函数，如：ref, reactive, toRef 等
        imports: ["vue", "@vueuse/core", "pinia", "vue-router", "vue-i18n"],
        resolvers: [
          // 导入 Element Plus函数，如：ElMessage, ElMessageBox 等
          ElementPlusResolver({ importStyle: "sass" }),
        ],
        eslintrc: {
          enabled: false,
          filepath: "./.eslintrc-auto-import.json",
          globalsPropValue: true,
        },
        vueTemplate: true,
        // 导入函数类型声明文件路径 (false:关闭自动生成)
        dts: false,
        // dts: "types/auto-imports.d.ts",
      }),
      // 组件自动导入
      Components({
        resolvers: [
          // 导入 Element Plus 组件
          ElementPlusResolver({ importStyle: "sass" }),
        ],
        // 指定自定义组件位置(默认:src/components)
        dirs: ["src/components", "src/**/components"],
        // 导入组件类型声明文件路径 (false:关闭自动生成)
        dts: false,
        //dts: "types/components.d.ts",
      }),
    ] as PluginOption[],
    // 预加载项目必需的依赖
    optimizeDeps: {
      include: [
        "vue",
        "vue-router",
        "element-plus",
        "pinia",
        "axios",
        "@vueuse/core",
        "codemirror-editor-vue3",
        "exceljs",
        "path-to-regexp",
        "echarts/core",
        "echarts/renderers",
        "echarts/charts",
        "echarts/components",
        "vue-i18n",
        "nprogress",
        "sortablejs",
        "qs",
        "vxe-table",
        "path-browserify",
        "lodash-es",
        "@element-plus/icons-vue",
        "element-plus/es",
        "element-plus/es/locale/lang/en",
        "element-plus/es/locale/lang/zh-cn",
        // Element Plus 组件样式预构建（resolver 驱动）：扫描 src 实际用到的组件/指令，
        // 解析出 base + 组件样式路径，首启即预加载，避免首次使用某组件时重优化导致页面刷新
        ...elementPlusStyleImports,
      ],
    },
    // 构建配置（Vite 8 使用 Rolldown + Oxc）
    build: {
      chunkSizeWarningLimit: 1200, // chunk 大小警告阈值
      reportCompressedSize: false,
      cssMinify: "lightningcss", // Vite 8 默认使用 Lightning CSS 压缩
      // minify 默认使用 'oxc'，压缩速度比 terser 快 30-90 倍
      rolldownOptions: {
        checks: {
          pluginTimings: false,
        },
        output: {
          // 用于从入口点创建的块的打包输出格式
          entryFileNames: "js/[name].[hash].js",
          // 用于命名代码拆分时创建的共享块的输出命名
          chunkFileNames: "js/[name].[hash].js",
          // 用于输出静态资源的命名
          assetFileNames: (assetInfo) => {
            const assetName = assetInfo.names[0];

            if (!assetName) {
              return "assets/[name].[hash][extname]";
            }

            const info = assetName.split(".");
            let extType = info[info.length - 1];
            if (/\.(mp4|webm|ogg|mp3|wav|flac|aac)(\?.*)?$/i.test(assetName)) {
              extType = "media";
            } else if (/\.(png|jpe?g|gif|svg)(\?.*)?$/.test(assetName)) {
              extType = "img";
            } else if (/\.(woff2?|eot|ttf|otf)(\?.*)?$/i.test(assetName)) {
              extType = "fonts";
            }
            return `${extType}/[name].[hash].[ext]`;
          },
        },
      },
    },
    define: {
      __APP_INFO__: JSON.stringify(__APP_INFO__),
    },
  };
});

// ── 工具函数 ──────────────────────────────────────────────────────────────
// Element Plus 按需样式解析器（与上方 AutoImport/Components 同配置，保证解析结果一致）
const elementPlusComponentResolver = ElementPlusResolver({
  importStyle: "sass",
})[0] as ComponentResolverObject;

// 扫描 src 实际用到的 Element Plus 组件/指令，经 resolver 解析出 base + 组件样式路径，
// 供 optimizeDeps 首启预构建，避免首次使用某组件时重优化导致页面刷新。
// 指令统一转成组件名解析（v-loading → ElLoading），与组件共用同一 resolver。
async function collectElementPlusStyleImports(): Promise<string[]> {
  const files: string[] = [];
  const walk = (dir: string) => {
    for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
      if (entry.isDirectory()) {
        walk(resolve(dir, entry.name));
      } else if (/\.(vue|ts|tsx|js|jsx)$/.test(entry.name)) {
        files.push(resolve(dir, entry.name));
      }
    }
  };
  walk(pathSrc);

  // kebab-case 名转 El 前缀 PascalCase：el-button-group → ElButtonGroup
  const toPascalName = (kebab: string) =>
    `El${kebab
      .split("-")
      .filter(Boolean)
      .map((part) => part.charAt(0).toUpperCase() + part.slice(1))
      .join("")}`;

  const names = new Set<string>();
  for (const file of files) {
    const source = fs.readFileSync(file, "utf-8");

    for (const match of source.matchAll(/<el-([a-z0-9][a-z0-9-]*)/g)) {
      names.add(toPascalName(match[1])); // <el-button> / <el-form-item>
    }
    for (const match of source.matchAll(/<([A-Z][A-Za-z0-9]*)/g)) {
      if (match[1].startsWith("El")) names.add(match[1]); // <ElTable> / <ElButton>
    }
    for (const match of source.matchAll(/\bEl[A-Z][A-Za-z0-9]*\b/g)) {
      names.add(match[0]); // ElMessage / ElMessageBox 等脚本标识符
    }
    for (const match of source.matchAll(/\bv-(loading|popover|infinite-scroll)\b/g)) {
      names.add(toPascalName(match[1])); // v-loading → ElLoading
    }
  }

  // 每个名字经 resolver 解析出的副作用即所需样式路径（sideEffects 支持 string / ImportInfo / 数组）
  const styleImports = new Set<string>();
  for (const name of names) {
    const resolved = await elementPlusComponentResolver.resolve(name);
    if (!resolved || typeof resolved === "string") continue;
    const { sideEffects } = resolved;
    if (!sideEffects) continue;
    for (const effect of Array.isArray(sideEffects) ? sideEffects : [sideEffects]) {
      styleImports.add(typeof effect === "string" ? effect : effect.from);
    }
  }
  return [...styleImports];
}