class Timer {
    private _elapsedTime: number = 0;
    get elapsedTime(): number {
        return this._elapsedTime;
    }
    private _step: number = -1;
    /** 触发间隔时间（秒） */
    get step(): number {
        return this._step;
    }
    set step(step: number) {
        this._step = step;                     // 每次修改时间
        this._elapsedTime = 0;                 // 逝去时间
    }
    get coundown(): number {
        return this._step - this._elapsedTime;
    }
    get progress(): number {
        return this._elapsedTime / this._step;
    }
    constructor(step: number = 0) {
        this.step = step;
    }
    /**
    * 序列化（数据库存储）
    */
    public serialize(): any {
        let data = {
            "step": this._step,
            "elapsed": this._elapsedTime,
        };
        return data;
    }
    /**
     * 反序列化
     */
    public unserialize(data: any): void {
        if (!data) return;
        this._step = data.step;
        this._elapsedTime = data.elapsed;
    }
    update(dt: number): boolean {
        if (this.step <= 0) return false;
        this._elapsedTime += dt;
        if (this._elapsedTime >= this._step) {
            this._elapsedTime -= this._step;
            return true;
        }
        return false;
    }
    reset() {
        this._elapsedTime = 0;
    }
    stop() {
        this._elapsedTime = 0;
        this.step = -1;
    }
}

export default function get_new_timer(step: number): Timer { return new Timer(step); }