/**任务*/
class  TimeTask
{
    public  tid:number;
    public  destTime:number;//延时执行时间
    public  callback:Function;//执行方法
    public  count:number;//执行次数
    public  delay:number;//间隔
    public  doDelete:boolean=false;
    constructor( tid:number,callback:Function, destTime:number,delay:number,count:number)
    {
        this.tid = tid;
        this.callback = callback;
        this.destTime = destTime;
        this.delay = delay;
        this.count = count;
    }
}
/**时间单位*/
export  enum TimeUnit
{
    Millisecond,
    Second,
    Hour,
    Day
}
/**
 * 时间定时任务
 * 更好管理某一模块层级的时间任务，暂停，取消等
 */
class  TimeJobCenter {
    private tid:number = 0;
    private tempList:Array<TimeTask>  = new Array<TimeTask>();
    private taskList:Array<TimeTask> = new Array<TimeTask>();
    private nowTime:number=0;
    public Dispose():void
    {
        this.taskList.length=0;
        this.tempList.length=0;
        this.nowTime=0;
    }
    private getTid():number
    {
        //安全代码以防过了
        if (this.tid==Number.MAX_VALUE)
        {
            let id = 0;
            while (true)
            {
                let used = false;
                for (let index = 0; index < this.taskList.length; index++)
                {
                    if (this.taskList[index].tid == id)
                    {
                        used = true;
                        break;
                    }
                }
                if (!used)
                {
                    break;
                }
                else
                {
                    id++;
                }
            }
            return id;
        }else{
            this.tid += 1; 
            return this.tid;
        }
    }
    /**延迟(ms)*/
    public delay(ms: number): Promise<void> {  
        return new Promise(resolve => this.AddTimeTask(resolve, ms,1,TimeUnit.Millisecond));  
    }
    /**延迟(s)*/
    public delay_second(ms: number): Promise<void> {  
        return new Promise(resolve => this.AddTimeTask(resolve, ms,1,TimeUnit.Second));  
    } 
    /**
     * 增加时间任务
     * @param callback 执行方法
     * @param delay 延迟时间
     * @param count 次数
     * @param timeUnit 时间单位 默认为 秒 TimeUnit.Second
     * @returns 时间任务id
     */
    public  AddTimeTask(callback:Function, delay:number,count:number = 1, timeUnit:TimeUnit = TimeUnit.Second):number
    {
            let tid = this.getTid();
            this.tempList.push(this.CreatNewTimeTask(tid, callback, delay, count, timeUnit));//增加一个任务到缓存
            return tid;
    }
    //
    private CreatNewTimeTask(tid:number, callback:Function, delay:number,count:number = 1, timeUnit:TimeUnit = TimeUnit.Second):TimeTask
    {
            if (timeUnit != TimeUnit.Second)
            {
                //如果单位不是秒，就全换算成秒做为单位
                switch (timeUnit)
                {
                    case TimeUnit.Millisecond:
                        delay *=0.001;
                        break;
                    case TimeUnit.Hour:
                        delay *= 360;
                        break;
                    case TimeUnit.Day:
                        delay *= 360 * 24;
                        break;
                    default:
                        console.error("Add Task TimeUnit Type Error...");
                        break;
                }
            }
            return new TimeTask(tid, callback,this.nowTime + delay, delay, count);
    }
    /**
     * 删除一个时间任务
     * @param tid 时间任务id
     * @returns 是否删除成功
     */
    public  DeleteTimeTask(tid:number):boolean
    {
            let exist = false;
            let tt: TimeTask;
            for (let i = 0; i < this.tempList.length; i++)
            {
                tt = this.tempList[i];
                if (tt.tid == tid)
                {
                    this.tempList[i].doDelete=true;
                    exist = true;
                    break;
                }
            }
            if (!exist)
            {
                for (let i = 0; i < this.taskList.length; i++)
                {
                    tt = this.taskList[i];
                    if (tt.tid == tid)
                    {
                        this.taskList[i].doDelete=true;
                        exist = true;
                        break;
                    }
                }
            }
            return exist;
      }
      //
      private _index:number;
      private _count:number;
      private _tt:TimeTask;
      //运行调用
      public Run(dt:number):void
      {
          this.nowTime +=dt;
          this._count=this.tempList.length;
          if (this._count> 0)
          {
              for (this._index = 0;this._index < this._count; this._index++)
              {
                   if(this.tempList[this._index].doDelete)continue;
                   this.taskList.push(this.tempList[this._index]);
              }
              this.tempList.length=0;
          }
          this._count=this.taskList.length;
          if(this._count>0){
             for (this._index = 0; this._index <this._count; this._index++)
             {
                this._tt = this.taskList[this._index];
                if (this.nowTime < this._tt.destTime) continue;
                if (this._tt.doDelete) continue;
                this._tt.callback();
                if (this._tt.count == 1)
                {
                    this._tt.doDelete=true;
                }
                else if (this._tt.count > 0)
                {
                    this._tt.count--;
                    this._tt.destTime += this._tt.delay;//下次执行时间
                }else{
                    this._tt.destTime += this._tt.delay;
                }
             }
          }
          this.taskList = this.taskList.filter(task => !task.doDelete);//把标记为删除的真正删除
       }
       //
}
export default function get_new_job():TimeJobCenter { return new TimeJobCenter();}