using System;
using UnityEngine;

namespace AibisDream.Kit
{
    internal class DelayFrame : IAction
    {
        public bool Paused { get; set; }
        public bool IsFinalized { get; set; }
        public ulong ActionID { get; set; }
        public ActionStatus Status { get; set; }

        private static SimpleObjectPool<DelayFrame> _simpleObjectPool = new(() => new DelayFrame(), null, 10);

        private Action _onDelayFinish;

        public static DelayFrame Allocate(int frameCount, Action onDelayFinish = null)
        {
            var delayFrame = _simpleObjectPool.Allocate();
            delayFrame.ActionID = ActionKit.IDGenerator++;
            delayFrame.Reset();
            delayFrame.IsFinalized = false;
            delayFrame._delayedFrameCount = frameCount;
            delayFrame._onDelayFinish = onDelayFinish;

            return delayFrame;
        }

        private int _startFrameCount;
        private int _delayedFrameCount;

        public void OnStart()
        {
            _startFrameCount = Time.frameCount;
        }

        public void OnExecute(float dt)
        {
            if (Time.frameCount >= _startFrameCount + _delayedFrameCount)
            {
                _onDelayFinish?.Invoke();
                this.Finish();
            }
        }

        public void OnFinish()
        {
        }

        public void Deinit()
        {
            if (!IsFinalized)
            {
                IsFinalized = true;
                _onDelayFinish = null;
                ActionKitMonoBehaviourEvents.AddCallback(
                    new ActionQueueRecycleCallback<DelayFrame>(_simpleObjectPool, this));
            }
        }

        public void Reset()
        {
            Status = ActionStatus.NotStart;
            Paused = false;
            _startFrameCount = 0;
        }
    }

    public static class DelayFrameExtension
    {
        public static ISequence DelayFrame(this ISequence self, int frameCount)
        {
            return self.Append(Kit.DelayFrame.Allocate(frameCount));
        }

        public static ISequence NextFrame(this ISequence self)
        {
            return self.Append(Kit.DelayFrame.Allocate(1));
        }
    }
}