class Facade {
  static #facadeAccessor

  static createFacadeFor(provider) {
    this.#facadeAccessor = provider

    return new Proxy(this, { get: this.__callStatic.bind(this) })
  }

  static __callStatic(facade, key) {
    /**
     * 访问Facade类的方法而不是提供者的方法。
     */
    if (facade[key]) {
      return facade[key]
    }

    const provider = new this.#facadeAccessor()

    const apply = (method, _this, args) => method.bind(provider)(...args)

    if (provider[key] === undefined) {
      return undefined
    }

    /**
     * 访问类的属性。
     */
    if (typeof provider[key] !== 'function') {
      return provider[key]
    }

    return new Proxy(provider[key], { apply })
  }
}

class Test {
  num = 0

  set(num) {
    this.num = this.num + num

    return this
  }

  get() {
    return this.num
  }
}

const TestFacade = Facade.createFacadeFor(Test)

console.log(TestFacade.set(10).set(20).get()) // 30
console.log(TestFacade.set(5).set(5).get()) // 10

const testInstance = TestFacade.set(10)

console.log(testInstance.num) // 10
console.log(testInstance.get()) // 10
console.log(testInstance.set(10).get()) // 20