// author:pandaHe
// time:2021.10.27
// tips:reading sharing ~~

// -- 1 -- DES:{工厂模式}
function Animal(opts) {
  let obj = new Object();
  obj.color = opts.color;
  obj.name = opts.name;
  obj.getInfo = function () {
    return "名称:" + obj.name + "颜色:" + obj.color;
  };
  return obj;
}
let cat = Animal({ name: "山猫", color: "黑色" });
// console.log(cat);

// -- 2 -- DES:{工厂模式}
class User {
  constructor(name = "", viewPage = []) {
    if (new.target === User) {
      throw new Error("抽象类不能实例化!");
    }
    this.name = name;
    this.viewPage = viewPage;
  }
}

class UserFactory extends User {
  constructor(name, viewPage) {
    super(name, viewPage);
  }
  create(role) {
    switch (role) {
      case "superAdmin":
        return new UserFactory("超级管理员", [
          "⾸⻚",
          "通讯录",
          "发现⻚",
          "应⽤数据",
          "权限管理",
        ]);
        break;
      case "admin":
        return new UserFactory("普通管理员", ["⾸⻚", "通讯录", "发现⻚"]);
        bteak;
    }
  }
}

let userFactory = new UserFactory();
let superAdmin = userFactory.create("superAdmin");
let admin = userFactory.create("admin");
// console.log(superAdmin);
// console.log(superAdmin);

// -- 3 -- DES:{工厂模式}

function getAbstractUserFactory(type) {
  switch (type) {
    case "wechat":
      return "UserOfWechat";
      break;
    case "qq":
      return "UserOfQq";
      break;
    case "weibo":
      return "UserOfWeibo";
      break;
    default:
      throw new Error("参数错误, 可选参数:wechat、qq、weibo");
  }
}

let WechatUserClass = getAbstractUserFactory("wechat");
let QqUserClass = getAbstractUserFactory("qq");
let WeiboUserClass = getAbstractUserFactory("weibo");
// let wechatUser = new WechatUserClass("微信⼩李");
// let qqUser = new QqUserClass("QQ⼩李");
// let weiboUser = new WeiboUserClass("微博⼩李");
// console.log(WechatUserClass);
// console.log(QqUserClass);
// console.log(WeiboUserClass);

// -- 4 -- DES:{单例模式）}

class Singleton {
  constructor() {}
}

Singleton.getInstance = (function () {
  let instance;
  return function () {
    if (!instance) {
      instance = new Singleton();
    }
    return instance;
  };
})();
let s1 = Singleton.getInstance();
let s2 = Singleton.getInstance();
// console.log(s1 === s2); // true

// -- 5 --DES:{异常处理/方案切换/适配模式}

var googleMap = {
  show: function () {
    console.log("开始渲染⾕歌地图");
  },
};
var baiduMap = {
  display: function () {
    console.log("开始渲染百度地图");
  },
};
var baiduMapAdapter = {
  show: function () {
    return baiduMap.display();
  },
  display: function () {
    return baiduMap.show();
  },
};
var renderMap = function (map) {
  if (map.show instanceof Function) {
    map.show();
  }
  if (map.display instanceof Function) {
    map.display();
  }
};
// renderMap(googleMap);
// renderMap(baiduMap);

// -- 6 --!!bug@readonly!! --DES:{添加额外的东西/装饰器模式}

// function readonly(target, key, descriptor) {
//    descriptor.writable = false;
//    return descriptor
//   };
//    class Test {
//       @readonly
//       name = 'yck'
//    };
//    let t = new Test();
//     t.yck = '111'
let newArray = [];
[{ name: "apple" }, { name: "pandaHe" }].map((item) => {
  newArray.push(Object.assign({}, item, { check: false }));
});
// console.log(newArray)

// -- 7 https://es6.ruanyifeng.com/#docs/proxy DES:{中间拦截}

var obj = {};
var proxy = new Proxy(obj, {
  get: function (target, key, receiver) {
    // console.log(`getting ${key}!`);
    return Reflect.get(target, key, receiver);
  },
  set: function (target, key, value, receiver) {
    // console.log(`setting ${key}!`);
    return Reflect.set(target, key, value, receiver);
  },
});
proxy.count = 1; // setting count!
 ++proxy.count; // getting count! 
 // setting count! // 2 
//  console.log(obj.count) // 2

// -- 8 -- DES:{一对多/发布订阅模式}
class Subject { constructor() {
  this.observers = []; // 观察者列表 
}
// 添加 
add(observer) { this.observers.push(observer); };
// 删除 
remove(observer) { let idx = this.observers.findIndex(item => item === observer); idx > -1 && this.observers.splice(idx, 1); }
// 通知
notify() { for (let observer of this.observers) { observer.update(); } } };
 // 观察者类
class Observer { constructor(name) { this.name = name; };
  // ⽬标对象更新时触发的回调
update() { console.log(`⽬标者通知我更新了，我是：${this.name}`); } };
   // 实例化⽬标者 
let subject = new Subject(); 
   // 实例化两个观察者 
let obs1 = new Observer('前端开发者');
let obs2 = new Observer('后端开发者'); 
    // 向⽬标者添加观察者 
subject.add(obs1); subject.add(obs2);
     // ⽬标者通知更新 
// subject.notify(); // 输出： // ⽬标者通知我更新了，我是前端开发者 // ⽬标者通知我更新了，我是后端开发

// -- 9 DES:{多对多}
// 事件中⼼ 
let pubSub = {
   list: {},
 // {onwork:[fn1,fn2],offwork:[fn1,fn2],launch:[fn1,fn2]}
  subscribe: function (key, fn) { 
    // 订阅 
    if (!this.list[key]) { this.list[key] = []; };
    this.list[key].push(fn);
   },
  publish: function(key, ...arg) {
       // 发布 
      for(let fn of this.list[key]) { 
        fn.call(this, ...arg);
       }
       },
  unSubscribe: function (key, fn) { 
         // 取消订阅 
        let fnList = this.list[key]; 
        if (!fnList) return false; if (!fn) { 
          // 不传⼊指定取消的订阅⽅法，则清空所有key下的订阅 
          fnList && (fnList.length = 0);
         } else {
            fnList.forEach((item, index) => { if (item === fn) { fnList.splice(index, 1); } }) } } 
      };
          // 订阅 
  pubSub.subscribe('onwork', time => { console.log(`上班。：${time}`); });
  pubSub.subscribe('offwork', time => { console.log(`下班啦~~：${time}`); });
  pubSub.subscribe('launch', time => { console.log(`吃饭啦~~：${time}`); })
  // 发布 
  // pubSub.publish('offwork', '18:00:00'); 
  // pubSub.publish('launch', '12:00:00'); 
  // pubSub.publish('onwork', '9:00:00'); 
  // 取消订阅 
  // pubSub.unSubscribe('onwork');

  // end