namespace CalendarNotepad.Extends
{
    /// <summary>
    /// 防止抖动执行任务
    /// </summary>
    public class Shaking
    {
        /// <summary>
        /// 下一个要执行的任务
        /// </summary>
        protected Task? Next { get; set; }
        /// <summary>
        /// 执行计时器
        /// </summary>
        protected System.Timers.Timer Timer { get; set; }
        /// <summary>
        /// 等待执行时间
        /// </summary>
        public int TimespanSeconds { get; set; }
        /// <summary>
        /// 使用默认方式实例化
        /// </summary>
        public Shaking() : this(5) { }
        /// <summary>
        /// 实例化，默认抖动执行间隔5秒
        /// </summary>
        /// <param name="timeSpanSeconds">抖动执行时间间隔。秒</param>
        public Shaking(int timeSpanSeconds) {
            this.TimespanSeconds = timeSpanSeconds * 1000;
            this.Timer = new System.Timers.Timer {
                Interval = this.TimespanSeconds
            };
            this.Timer.Elapsed += Timer_Tick;
            this.Timer.Stop();
        }

        protected void Timer_Tick(object? sender,EventArgs e) {
            this.Timer.Stop();
            this.Timer.Dispose();
            if(this.Next == null) {
                return;
            }
            var n = this.Next;
            this.Next = null;
            n.Start();
        }
        /// <summary>
        /// 防抖执行任务
        /// </summary>
        /// <param name="task">要执行的任务</param>
        public void Run(Task task) {
            this.Next = task;
            if(this.Timer != null) {
                this.Timer.Stop();
                this.Timer.Dispose();
            }
            this.Timer = new System.Timers.Timer {
                Interval = this.TimespanSeconds,
            };
            this.Timer.Elapsed += Timer_Tick;
            this.Timer.Start();
        }
        /// <summary>
        /// 防抖执行委托
        /// </summary>
        /// <param name="action">要执行的委托</param>
        public void Run(Action action) => Run(new Task(action));
    }
}