using System;
using UnityEngine;
using System.Collections.Generic;
using UnityEngine.Events;


public class Clock
{
    public bool stopped { get; set; }
    DateTime alarmTime;
    UnityAction alarmCallBack;

    public Clock(DateTime alarmTime, UnityAction callBack)
    {
        this.alarmTime = alarmTime;
        this.alarmCallBack = callBack;
    }

    public bool CanAlarm()
    {
        return DateTime.Now >= alarmTime;
    }

    public void Execute()
    {
        if (alarmCallBack != null)
        {
            alarmCallBack();
            alarmCallBack = null;
        }
    }

    static List<Clock> clocks = new List<Clock>();

    public static void Init()
    {
        new LogicUpdate().Start(OnUpdate);
    }

    public static Clock AlarmAt(DateTime alarmTime, UnityAction callBack)
    {
        var clock = new Clock(alarmTime, callBack);

        clocks.Add(clock);
        return clock;
    }

    public static Clock AlarmAfter(double seconds, UnityAction callBack)
    {
        var clock = new Clock(DateTime.Now.AddSeconds(seconds), callBack);

        clocks.Add(clock);
        return clock;
    }

    public static void Stop(Clock clock)
    {
        if (clocks.Contains(clock))
        {
            clock.stopped = true;
        }
    }

    static void OnUpdate()
    {
        for (var i = clocks.Count - 1; i >= 0; i--)
        {
            var clock = clocks[i];
            if (clock.stopped)
            {
                clocks.RemoveAt(i);
                continue;
            }

            if (clock.CanAlarm())
            {
                try
                {
                    clock.Execute();
                    clocks.RemoveAt(i);
                }
                catch (Exception e)
                {
                    Debug.LogException(e);
                }
            }
        }
    }

}