// 自定义组件引入方式一
import {
  AppstoreOutlined,
  MailOutlined,
  SettingOutlined,
} from "@ant-design/icons";
const Icons = {
  AppstoreOutlined,
  MailOutlined,
  SettingOutlined,
}
// 自定义组件引入方式二
// import * as Icons from "@ant-design/icons"; // 注意要先引入icons

import React from 'react'
import { Menu } from "antd";
import "./css/LeftMenu.scss";
import { useState, useEffect } from "react";

const DynamicComponent = ( tag ) => {
  if(!tag) return null
  if (/[a-z]/.test(tag[0])) {
    // 组件名开头为小写字母,内置组件div，input等
    const Ele = tag
    return <Ele>aaa</Ele>;
  } else if (/[A-Z]/.test(tag[0])) {
    // 组件名开头为大写字母，自定义组件
    const Tag = Icons[tag]; // 变量名必须以大写字母开头
    return <Tag />; // 使用标签变量来渲染组件
  } else {
    // 组件名不符合规范
    return null
  }
}
export default function LeftMenu() {
  const [items, setItems] = useState([
    {
      label: "Navigation One",
      key: "sub1",
      icon: "MailOutlined",
      children: [
        {
          label: "Item 1",
          key: "g1",
          children: [
            {
              label: "Option 1",
              key: "1",
              icon: "div",
            },
            {
              label: "Option 2",
              key: "2",
            },
          ],
          type: "group",
        },
        {
          label: "Item 2",
          key: "g2",
          children: [
            {
              label: "Option 3",
              key: "3",
            },
            {
              label: "Option 4",
              key: "4",
            },
          ],
          type: "group",
        },
      ],
    },
    {
      label: "Navigation Two",
      key: "sub2",
      icon: "AppstoreOutlined",
      children: [
        {
          label: "Option 5",
          key: "5",
        },
        {
          label: "Option 6",
          key: "6",
        },
        {
          label: "Submenu",
          key: "sub3",
          children: [
            {
              label: "Option 7",
              key: "7",
            },
            {
              label: "Option 8",
              key: "8",
            },
          ],
        },
      ],
    },
  ])
  function handleItems() {
    const deepFunc = function (arr){
      let arr1 = []
      arr.forEach(item => {
        let obj = {
          ...item,
          icon: DynamicComponent(item.icon)
        }
        if(item.children && item.children.length) {
          obj.children = deepFunc(item.children)
        }
        arr1.push(obj)
      })
      return arr1
    }
    setItems(deepFunc(items))
  }
  useEffect(() => {
    handleItems()
  }, [])
  const onClick = (e) => {
    console.log(e);
  };
  return (
      <Menu
        className="left-menu"
        onClick={onClick}
        defaultSelectedKeys={["1"]}
        defaultOpenKeys={["sub1"]}
        mode="inline"
        items={items}
      />
  );
}