using System;
using System.Collections.Generic;

namespace BITKit
{
    /// <summary>
    /// 循环
    /// </summary>
    public interface ITicker
    {
        /// <summary>
        /// 总帧数
        /// </summary>
        ulong TickCount { get; }
        /// <summary>
        /// 在下一次循环时执行，仅执行一次
        /// </summary>
        /// <param name="action"></param>
        void Add(Action action);
        /// <summary>
        /// 注册在下一次循环时执行，每次循环都会执行
        /// </summary>
        /// <param name="action"></param>
        void Add(Action<float> action);
        /// <summary>
        /// 移除循环
        /// </summary>
        /// <param name="action"></param>
        void Remove(Action<float> action);
        /// <summary>
        /// 手动调用循环
        /// </summary>
        /// <param name="delta"></param>
        void ManualTick(float delta);
    }
    /// <summary>
    /// 主线程循环
    /// </summary>
    public interface IMainTicker : ITicker { }
    /// <summary>
    /// 线程池循环
    /// </summary>
    public interface IThreadTicker : ITicker { }
  
    
    #if UNITY_5_3_OR_NEWER
    /// <summary>
    /// 最后执行的循环,通常用于旋转、位移等
    /// </summary>
    public interface IAfterTicker : ITicker{}
    /// <summary>
    /// Unity专用固定循环
    /// </summary>
    public interface IFixedTicker : ITicker{}
    #endif
    
    
    public class Ticker : ITicker
    {
        private readonly Queue<Action> _queue = new();
        private event Action<float> TickEvents;
        public ulong TickCount { get; private set; }
        public void Add(Action action)
        {
            _queue.Enqueue(action);
        }
        public void Add(Action<float> action)=>TickEvents += action;
        public void Remove(Action<float> action)=>TickEvents -= action;

        public void ManualTick(float delta)
        {
            TickCount++;
            while (_queue.TryDequeue(out var action))
            {
                action.Invoke();
            }
            TickEvents?.Invoke(delta);
        }
    }
}