using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Cysharp.Threading.Tasks;
using System.Threading;
using System.Threading.Tasks;
using Unity.Mathematics;
namespace BITKit.Animations
{
    public class UnityAnimator : MonoBehaviour, IAnimator
    {
        [System.Serializable]
        public record AnimatorPlayEvent
        {
            public string stateName;
            public int index;
        }
        [System.Serializable]
        public class AnimatorLayerInfo
        {
            public string stateName;
            public string fullStateName;
            public AnimatorStateInfo currentState = new();
            public event Action<string> onStateEnter;
            public event Action<string> onStateExit;
            public void OnStateEnter(string name)
            {
                onStateEnter?.Invoke(name);
            }
            public void OnStateExit(string name)
            {
                onStateExit?.Invoke(name);
            }
        }
        [Header(Constant.Header.Components)]
        public Animator animator;
        [Header(Constant.Header.State)]
        public bool isMatchingTarget;
        public AnimatorLayerInfo this[int index]
        {
            get
            {
                if (layerInfos.Count <= index)
                {
                    for (int i = layerInfos.Count - 1; i < index; i++)
                    {
                        layerInfos.Add(new());
                    }
                }
                return layerInfos[index];
            }
        }
        public List<AnimatorLayerInfo> layerInfos = new();

        [Header(Constant.Header.InternalVariables)]
        private readonly Dictionary<string,UnityAnimatorStateInfo> _registryStates=new ();
        public void CrossFade(string name, float duration, int index = 0, float normalizedTimeOffset = 0)
        {
            animator.CrossFade(name, duration, index);
        }

        public void Play(string name, int index = -1, float normalizedTimeOffset = 0)
        {
            name = name.Replace(".", "_");

            if (_registryStates.TryGetValue(name, out var stateInfo) && stateInfo.variables?.Length > 0)
            {
                name = stateInfo.variables.Random();
            }

            animator.Play(name, index, normalizedTimeOffset);
        }

        public void Play(string name)
        {
            Play(name,-1,0);
        }

        public void OnStateEnter(int index, string name)
        {
            this[index].fullStateName = name;
            foreach (var item in name.Split("."))
            {
                name = item;
                break;
            }
            this[index].stateName = name;
            this[index].OnStateEnter(name);
        }
        public void OnStateExit(int index, string name)
        {
            this[index].OnStateExit(name);
        }
        public float3 GetRootVelocity()
        {
            return animator.velocity;
        }

        private void Start()
        {
            foreach (var x in animator.GetBehaviours<UnityAnimatorStateInfo>())
            {
                _registryStates.TryAdd(x.stateName, x);
            }
        }

        private void Update()
        {
            int index = 0;
            foreach (var x in layerInfos)
            {
                x.currentState = animator.GetCurrentAnimatorStateInfo(index++);
            }
            isMatchingTarget = animator.isMatchingTarget;
        }
    }
}