using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace ChivaXR.Tool
{
    /// <summary>
    /// 锯断效果
    /// </summary>
    public class CVR_SawingEffect : Singleton<CVR_SawingEffect>
    {
        /// <summary>
        /// 锯断效果依附的旋转点
        /// </summary>
        public Transform m_RotationPoint;

        /// <summary>
        /// 带有刚体的目标
        /// </summary>
        public Rigidbody m_TargetRigidbody;

        /// <summary>
        /// 模型朝向
        /// </summary>
        private ModelTowards m_ModelTowards;

        /// <summary>
        /// 设置初始状态
        /// </summary>
        /// <param name="_point"></param>
        /// <param name="_rigidbody"></param>
        /// <param name="_state"></param>
        public void SetStartStateData(Transform _point, Rigidbody _rigidbody, ModelTowards _state)
        {
            this.m_RotationPoint = _point;
            this.m_TargetRigidbody = _rigidbody;
            this.m_ModelTowards = _state;

            CVR_SawingSystem.SetSawingOpState(this, 0, 0);
        }

        /// <summary>
        /// 每帧执行
        /// </summary>
        public void SimulationUpdate(float _currentMoveDis, float _value, Action _action)
        {
            CVR_SawingSystem.SawingOpSimulation(this, _currentMoveDis, _value, m_ModelTowards, _action);
        }
    }

    /// <summary>
    /// 锯切系统
    /// </summary>
    internal class CVR_SawingSystem
    {
        /// <summary>
        /// 锯切操作控制器
        /// </summary>
        /// <param name="_data"></param>
        /// <param name="_currentMoveDis"></param>
        /// <param name="_value"></param>
        /// <param name="_action"></param>
        public static void SawingOpSimulation(CVR_SawingEffect _data, float _currentMoveDis, float _value, ModelTowards _modelTowards, Action _action)
        {
            if (_value < 0.0f)
            {
                return;
            }

            if (_value < 0.6f)
            {
                _data.m_RotationPoint.localEulerAngles = Vector3.Lerp(Vector3.zero, new Vector3(0, 0, SetDistance(_modelTowards, 5)), (_currentMoveDis / 0.6f) * _value);
            }
            else if (_value < 0.8f)
            {
                _data.m_RotationPoint.localEulerAngles = Vector3.Lerp(new Vector3(0, 0, SetDistance(_modelTowards, 5)), new Vector3(0, 0, SetDistance(_modelTowards, 10)), (_currentMoveDis / 0.2f) * _value - 3);
            }
            else if (_value < 1f)
            {
                _data.m_RotationPoint.localEulerAngles = Vector3.Lerp(new Vector3(0, 0, SetDistance(_modelTowards, 10)), new Vector3(0, 0, SetDistance(_modelTowards, 75)), (_currentMoveDis / 0.2f) * _value - 4);
            }
            else
            {
                if (_data.m_TargetRigidbody != null)
                {
                    _data.m_TargetRigidbody.useGravity = true;
                    _data.m_TargetRigidbody.isKinematic = false;
                }
                if (_data.m_TargetRigidbody.GetComponent<Collider>() != null)
                {
                    _data.m_TargetRigidbody.GetComponent<Collider>().isTrigger = false;
                }

                _action?.Invoke();
            }
        }

        /// <summary>
        /// 锯断电缆状态变化
        /// </summary>
        /// <param name="_data"></param>
        /// <param name="_value"></param>
        public static void SetSawingOpState(CVR_SawingEffect _data, float _currentMoveDis, float _value)
        {
            if (_value < 0.0f)
            {
                return;
            }

            if (_value < 0.6f)
            {
                _data.m_RotationPoint.localEulerAngles = Vector3.Lerp(Vector3.zero, new Vector3(0, 0, 5), (_currentMoveDis / 0.6f) * _value);
            }
            else if (_value < 0.8f)
            {
                _data.m_RotationPoint.localEulerAngles = Vector3.Lerp(new Vector3(0, 0, 5), new Vector3(0, 0, 10), (_currentMoveDis / 0.2f) * _value - 3);
            }
            else if (_value <= 1f)
            {
                _data.m_RotationPoint.localEulerAngles = Vector3.Lerp(new Vector3(0, 0, 10), new Vector3(0, 0, 75), (_currentMoveDis / 0.2f) * _value - 4);
            }
        }


        /// <summary>
        /// 设置距离值
        /// </summary>
        /// <param name="_state"></param>
        /// <param name="_dis"></param>
        /// <returns></returns>
        private static float SetDistance(ModelTowards _state, float _dis)
        {
            return _state == ModelTowards.Positive ? Mathf.Abs(_dis) : -Mathf.Abs(_dis);
        }
    }

    /// <summary>
    /// 模型朝向
    /// </summary>
    public enum ModelTowards
    {
        /// <summary>
        /// 正
        /// </summary>
        Positive,
        /// <summary>
        /// 负
        /// </summary>
        Negative,
    }
}