class Flash extends els.Component {
    private _ontime: number;
    private _offtime: number;
    private _state: number;
    private _timesLeft: number;
    private _onOldTime: number;
    private _offOldTime: number;
    private _start: boolean = false;
    constructor() {
        super();
    }

    tick() {
        var inst: els.GameObject = this.gameobject;
        if (!inst) return;
        if (!this._start)
                return;    
        var dt: number              = inst.dt;
        if (this._timesLeft <= 0 && this._start) {
            this._timesLeft = 0;
            inst.visible            = true;
            this._start             = false;
            return;
        }

        var currentTime: number     = egret.getTimer();
        if (this._state === 0) {
            if (currentTime - this._onOldTime >= this._ontime * 1000) {
                this._offOldTime    = currentTime;
                this._state         = 1;
            }
            inst.visible = true;
        } else if (this._state === 1) {
            inst.visible = false;
            if (currentTime - this._offOldTime >= this._offtime * 1000) {
                this._onOldTime     = currentTime;
                this._state         = 0;
                this._timesLeft--;
            }
        }
    }


    startFlash(onTime: number, offTime: number, times: number) {
        var inst: els.GameObject    = this.gameobject;
        if (!inst) return;
        this._ontime                = onTime;
        this._offtime               = offTime;
        this._state                 = 0;
        this._timesLeft             = times;
        this._timesLeft             = (this._timesLeft <= 0) ? Number.MAX_VALUE : this._timesLeft;
        inst.visible                = true;
        this._onOldTime             = egret.getTimer();
        this._offOldTime            = egret.getTimer();
        this._start                 = true;
        if (this._ontime < 0) this._ontime = 0;
        if (this._offtime < 0) this._offtime = 0;
    }

    stopFlashing() {
        this._start = false;
        this._timesLeft = 0;
        if (this.gameobject)
            this.gameobject.visible = true;    
    }
}