type Action = { check: () => boolean, entry: () => void, do: (dt: number) => void, dispose: () => void };
export type ActionCreat = (...args: any) => Action;
export default function get_new_action_center(): ActionCenter { return new ActionCenter(); }
/**行为机*/
class ActionCenter {
   private _list: Action[] = [];
   private _current: Action;
   /**加入一个创建行为的闭包的函数
    * ActionCreat = (...args: any) => Action;    
    * Action ={check:() => boolean,entry:() => void,do:(dt:number)=>void}
    */
   public add(actionCreat: ActionCreat, ...args: any): void {
      this._list.push(actionCreat(...args));
   }
   /**检测和进入行为*/
   public check_entry(): void {
      if (this._current?.check()) return;
      for (let i = 0; i < this._list.length; i++) {
         if (this._current != this._list[i] && this._list[i].check()) {
            this._current = this._list[i];
            this._current.entry();
            return;
         }
      }
      this._current = null;
   }
   /**是否有正在执行的行为 */
   public get isAction(): boolean {
      return this._current != null;
   }
   /**执行行为*/
   public do(dt: number): void {
      if (this._current) this._current.do(dt);
   }
   /**清除所有行为*/
   public clean(): void {
      for (let i = 0; i < this._list.length; i++) {
         this._list[i].dispose();
      }
      this._list.length = 0;
      this._current = null;
   }
   /*例子
   public test():void{
     const who={state:0};
     this.add((who:{state:number})=>{
          const w = who;
          let time:number=0;
          return{
             check:()=>{
                 if(w.state==0){
                   return true;
                 }
                 return false;
             },
             entry:()=>{
                time=0;
                console.log("entry 行为1",time);
             },
             do:(dt:number)=>{
                 time+=dt;
                 if(time>=2){
                    console.log("do",time);
                    w.state=1;
                 };
             }
         }
     },who);
     this.add((who:{state:number})=>{
      const w = who;
      let time:number=0;
      return{
         check:()=>{
             if(w.state==1){
               return true;
             }
             return false;
         },
         entry:()=>{
            time=0;
            console.log("entry 行为2",time);
         },
         do:(dt:number)=>{
             time+=dt;
             if(time>=2){
                console.log("do",time);
                w.state=0;
             };
         }
      }
     },who);
   }*/
}