using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using System.Linq;
using System.Text.RegularExpressions;

namespace ChivaXR
{
    /// <summary>
    /// Animation组件编辑状态（Scene运行）
    /// </summary>
    public class AnimationEditorWindows : EditorWindow
    {
        [MenuItem("ChivaTool/AniEditor& &#I")]
        public static void ShowWindows()
        {

            EditorWindow.GetWindow<AnimationEditorWindows>().Show();
        }

        public Animation _animation;  //片段
        public float AnimationMaxFrame
        {
            get
            {
                if (!_animation) return 0;
                return _animation.clip.length * _animation.clip.frameRate;
            }
        }

        public float _minValue = 0;   //区间最小值
        public float _maxValue = 1;   //区间最大值
        public int _minFrame;         //区间最小值帧数
        public int _maxFrame;         //区间最大值帧数
        public float _value;          //Clip片段指定Value
        public bool _isStartAni;      //是否开启动画控制  

        List<string> animationClipNames = new List<string>();

        private void OnEnable()
        {
            EditorApplication.update += EditorStateUpdate;
        }

        private void OnDisable()
        {
            EditorApplication.update -= EditorStateUpdate;
        }

        public void OnGUI()
        {
            EditorGUILayout.Space();
            this._animation = EditorGUILayout.ObjectField("", this._animation, typeof(Animation), true) as Animation;

            _minFrame = Mathf.Clamp(EditorGUILayout.IntField("StartFrame:", _minFrame), 0, Mathf.FloorToInt(AnimationMaxFrame));
            _maxFrame = Mathf.Clamp(EditorGUILayout.IntField("EndFrame:", _maxFrame), 0, Mathf.FloorToInt(AnimationMaxFrame));
            UpdateFrameToValue();
            EditorGUILayout.MinMaxSlider("动画区间选择", ref _minValue, ref _maxValue, 0, 1);
            UpdateValueToFrame();
            _value = EditorGUILayout.Slider("动画区间进度", _value, _minValue, _maxValue);
            EditorGUILayout.TextField("动画名称：" + GetCurrentClipName() + "----当前帧：" + GetCurrentFrame() );

            GUILayout.BeginHorizontal();

            if (GUILayout.Button("上一片段"))
            {
                if (CheckClipNames() && animationClipNames.IndexOf(this._animation.clip.name) > 0)
                {
                    this._animation.clip = this._animation[animationClipNames[animationClipNames.IndexOf(this._animation.clip.name) - 1]].clip;
                    _minFrame = 0;
                    _maxFrame = Mathf.FloorToInt(AnimationMaxFrame);
                }
            }

            if (GUILayout.Button("下一片段"))
            {
                if (CheckClipNames() && animationClipNames.IndexOf(this._animation.clip.name) < animationClipNames.Count - 1)
                {
                    this._animation.clip = this._animation[animationClipNames[animationClipNames.IndexOf(this._animation.clip.name) + 1]].clip;
                    _minFrame = 0;
                    _maxFrame = Mathf.FloorToInt(AnimationMaxFrame);
                }
            }

            GUILayout.EndHorizontal();

            if (!_isStartAni)
            {
                if (GUILayout.Button("开启动画控制器"))
                {
                    _isStartAni = true;
                }
            }
            else
            {
                if (GUILayout.Button("关闭动画控制器"))
                {
                    _isStartAni = false;
                }
            }
        }

        public void UpdateValueToFrame()
        {
            if (!_animation) return;

            _minFrame = Mathf.RoundToInt(AnimationMaxFrame * _minValue);
            _maxFrame = Mathf.RoundToInt(AnimationMaxFrame * _maxValue);
        }


        public bool CheckClipNames()
        {
            if (this._animation == null) return false;

            if (this._animation && this.animationClipNames.Count > 0) return true;

            animationClipNames.Clear();
            foreach (AnimationState state in this._animation)
            {
                animationClipNames.Add(state.name);
            }
            animationClipNames = animationClipNames.OrderBy(
                x => float.Parse(Regex.Match(x, "\\d+(\\.?\\d?)").Value)).ToList();

            return true;
        }

        public void UpdateFrameToValue()
        {
            if (!_animation) return;

            _minValue = _minFrame / AnimationMaxFrame;
            _maxValue = _maxFrame / AnimationMaxFrame;
        }

        private void EditorStateUpdate()
        {
            SetCurrentAni();
        }

        public void SetCurrentAni()
        {
            if (_animation == null || !_isStartAni) return;

            AnimationState aniState = _animation[_animation.clip.name];
            aniState.enabled = true;
            aniState.speed = 0;
            aniState.weight = 1;
            aniState.normalizedTime = _value;
            _animation.Sample();
            aniState.enabled = false;
        }

        public int GetCurrentFrame()
        {
            if (!_animation)
            {
                return 0;
            }
            return Mathf.RoundToInt(AnimationMaxFrame * _value);
        }
        public string GetCurrentClipName()
        {
            if(!_animation)
            {
                return "";
            }
            return _animation.clip.name;
        }
    }
}