using System;
using System.Collections.Generic;

using System.Text;
using UnityEngine;

namespace Thousandto.Code.Logic
{
    //角色振动器，用于怪物在被攻击时的震动效果
    public class CharacherShaker
    {
        private Character _owner = null;
        private float _timeCounter = 0f;
        private bool _isEnable = false;

        private Vector3 _shakeDir = Vector3.zero;
        private float _shakePower = 1f;
        private float _shakeTime = 1f;

        private static AnimationCurve _shakeCurve = null;
        private static float _shakeCurveTime = 0f;

        public CharacherShaker(Character owner)
        {
            _owner = owner;
            _isEnable = false;
        }

        public void StartShake(Vector3 dir, float power, float time)
        {
            if (dir == Vector3.zero || power <= 0f || time <= 0f)
                return;
            if (_owner.Skin == null)
                return;
            if (_isEnable)
                return;
            _isEnable = true;
            _timeCounter = 0f;
            _shakeDir = dir.normalized;
            _shakePower = power;
            _shakeTime = time;

            if (_shakeCurve == null)
            {
                _shakeCurve = new AnimationCurve();
                _shakeCurve.AddKey(0f, 0f);
                _shakeCurve.AddKey(0.065f, 0.0903f);
                _shakeCurve.AddKey(0.134f, -0.0766f);
                _shakeCurve.AddKey(0.233f, 0.1558f);
                _shakeCurve.AddKey(0.305f, -0.1215f);
                _shakeCurve.AddKey(0.414f, 0.1836f);
                _shakeCurve.AddKey(0.517f, -0.1477f);
                _shakeCurve.AddKey(0.603f, 0.1489f);
                _shakeCurve.AddKey(0.703f, -0.1002f);
                _shakeCurve.AddKey(0.703f, -0.1002f);
                _shakeCurve.AddKey(0.798f, 0.1140f);
                _shakeCurve.AddKey(0.84f, -0.0601f);
                _shakeCurve.AddKey(0.923f, 0.0699f);
                _shakeCurve.AddKey(1f, 0f);

                _shakeCurveTime = 1f;
            }
        }

        public void Update(float dt)
        {
            if (_isEnable)
            {
                if (_owner.Skin == null || _shakeCurve == null)
                    return;
                var body = _owner.Skin.GetSkinPart(Core.Asset.FSkinPartCode.Body);
                if(body == null)
                {
                    return;
                }
                _timeCounter += dt;
                if (_timeCounter > _shakeTime)
                {
                    _isEnable = false;
                    body.SetLocalPosition(Vector3.zero);
                }
                else
                {
                    float i = Mathf.Clamp(_timeCounter / _shakeTime, 0f, 1f) * _shakeCurveTime;
                    float value = _shakeCurve.Evaluate(i) * _shakePower;

                    body.SetLocalPosition(_shakeDir * value);
                }
            }
        }
    }
}