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

namespace BF
{
    public class OneShotManager : ManagerBase
    {
        static OneShotManager instance;
        public static OneShotManager Create()
        {
            BFLog.LogAssert(instance == null, "This method only allows BFMain to call once");
            instance = new OneShotManager();
            return instance;
        }

        List<Action> oneShotList;

        int updateFrame = -1;
        int executeCount;

        OneShotManager() { }

        public override void Init()
        {
            oneShotList = new List<Action>(16);
        }

        public override void Destroy()
        {
            oneShotList.Clear();
            instance = null;
        }

        public override void Update()
        {
            updateFrame = Time.frameCount;
            int totalCount = oneShotList.Count;
            if (totalCount > 0)
            {
                int count = executeCount;
                executeCount = totalCount - count;
                if (executeCount < 0)
                {
                    executeCount = 0;
                }
                if (count > 0)
                {
                    for (int i = 0; i < count; i++)
                    {
                        oneShotList[i]();
                    }
                    oneShotList.RemoveRange(0, count);
                }
            }
        }

        public void AddOneShot(Action oneShot)
        {
            if (Time.frameCount == updateFrame)
            {
                executeCount++;
            }
            oneShotList.Add(oneShot);
        }

    }
}