import State from './State'
import StateMachine from './StateMachine'

/***
 * 子有限状态机基类
 * 用处:例如有个idle的state,但是有多个方向,为了让主状态机更整洁,可以把同类型的但具体不同的state都封装在子状态机中
 */
export default abstract class SubStateMachine {
  private _currentState: State = null
  stateMachines: Map<string, State> = new Map()

  constructor(public fsm: StateMachine) {}

  get currentState() {
    return this._currentState
  }

  set currentState(newState) {
    if (!newState) {
      return
    }
    this._currentState = newState
    this._currentState.run()
  }

  /***
   * 具体类实现
   */
  abstract run(): void
}