//using Assets.Script.Base;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[RequireComponent(typeof(ParticleSystem))]
public class ParticleMove : MonoBehaviour
{
    [Tooltip("移动类型point，为到目标位置，Circle为绕目标旋转")]
    public MoveTypeEnum MoveType;

    [Tooltip("point时为目标位置，Circle时为圆心点")]
    public Transform TargetPosition;

    [Tooltip("角度为90，270分别顺逆时间转")]
    [Range(0, 360)]
    public float P = 1;

    public float MoveTime;

    private float Speed;
    float Distance;
    ParticleSystem particleSys;
    ParticleSystem.Particle[] particleArray;


    public enum MoveTypeEnum
    {
        Point,
        Circle
        //以后需要啥加啥，先这2种
    }

    void Start()
    {

        particleSys = GetComponent<ParticleSystem>();

        if (particleArray == null || particleArray.Length < particleSys.main.maxParticles)
            particleArray = new ParticleSystem.Particle[particleSys.main.maxParticles];

        //////Debug.Log((P2 - P1).magnitude);

    }

    void LateUpdate()
    {

        //if (TargetPosition == null)
        //{
        //    if (m_Target != null)
        //    {
        //        TargetPosition = m_Target.transform;
        //    }
        //}

        if (TargetPosition != null)
        {
            MoveFunc();
        }
    }

    void MoveFunc()
    {

        var numParticlesAlive = particleSys.GetParticles(particleArray);

        for (int i = 0; i < numParticlesAlive; i++)
        {
            if (particleSys.shape.shapeType == ParticleSystemShapeType.SkinnedMeshRenderer || particleSys.shape.shapeType == ParticleSystemShapeType.MeshRenderer)
            {

                MainMoveFuncByMesh(i);

            }
            else
            {
                MainMoveFunc(i);
            }

        }
        particleSys.SetParticles(particleArray, numParticlesAlive);

    }
    void MainMoveFunc(int i)
    {
        if (MoveType == MoveTypeEnum.Point)
        {
            if (particleSys.main.simulationSpace == ParticleSystemSimulationSpace.Local)
            {
                //realyPos.position = transform.TransformPoint(particleArray[i].position);
                Vector3 normalize = (transform.InverseTransformPoint(TargetPosition.position) - particleArray[i].position).normalized;
                Distance = (transform.InverseTransformPoint(TargetPosition.position) - particleArray[i].position).magnitude;
                Speed = Distance / MoveTime;
                // particleArray[i].position = new Vector3(particleArray[i].position.x*normalize.x, particleArray[i].position.y * normalize.z, particleArray[i].position.z * normalize.y) * Speed ;
                particleArray[i].position += normalize * Speed;

            }
            if (particleSys.main.simulationSpace == ParticleSystemSimulationSpace.World)
            {
                movePointByWorld(i);
            }

        }
        if (MoveType == MoveTypeEnum.Circle)
        {
            if (particleSys.main.simulationSpace == ParticleSystemSimulationSpace.Local)
            {
                Vector3 normalize = (transform.InverseTransformPoint(TargetPosition.position) - particleArray[i].position).normalized;

                Distance = (transform.InverseTransformPoint(TargetPosition.position) - particleArray[i].position).magnitude;
                Speed = Distance / MoveTime;
                Vector2 v21 = RotationMatrix(new Vector2(normalize.x, normalize.y), P);

                particleArray[i].position += new Vector3(v21.x, v21.y, normalize.z) * Speed;

            }
            if (particleSys.main.simulationSpace == ParticleSystemSimulationSpace.World)
            {
                moveCircleByWorld(i);

            }

        }

    }
    void MainMoveFuncByMesh(int i)
    {
        if (MoveType == MoveTypeEnum.Point)
        {
            if (particleSys.main.simulationSpace == ParticleSystemSimulationSpace.Local)
            {
                //particleSys.simulationSpace = ParticleSystemSimulationSpace.World;

                ParticleSystem.MainModule mainModule = particleSys.main;
                mainModule.simulationSpace = ParticleSystemSimulationSpace.World;
            }
            if (particleSys.main.simulationSpace == ParticleSystemSimulationSpace.World)
            {
                movePointByWorld(i);
            }

        }
        if (MoveType == MoveTypeEnum.Circle)
        {
            if (particleSys.main.simulationSpace == ParticleSystemSimulationSpace.Local)
            {
                //particleSys.simulationSpace = ParticleSystemSimulationSpace.World;

                ParticleSystem.MainModule mainModule = particleSys.main;
                mainModule.simulationSpace = ParticleSystemSimulationSpace.World;
            }
            if (particleSys.main.simulationSpace == ParticleSystemSimulationSpace.World)
            {
                moveCircleByWorld(i);

            }

        }

    }
    
    void moveCircleByWorld(int i)
    {
        Vector3 normalize = (TargetPosition.position - particleArray[i].position).normalized;

        Distance = (TargetPosition.position - particleArray[i].position).magnitude;
        Speed = Distance / MoveTime;
        Vector2 v21 = RotationMatrix(new Vector2(normalize.x, normalize.z), P);

        particleArray[i].position += new Vector3(v21.x, normalize.y, v21.y) * Speed;
    }
    void movePointByWorld(int i)
    {
        //这行只是测试初始点位置用的
        //realyPos.position = transform.InverseTransformPoint(particleArray[i].position).normalized;
        Vector3 Devil = TargetPosition.position - particleArray[i].position;

        if (Mathf.Abs(Devil.x) >= 0.01f && Mathf.Abs(Devil.y) >= 0.01f && Mathf.Abs(Devil.z) >= 0.01f)
        {
            Vector3 normalize = Devil.normalized;
            Distance = (TargetPosition.position - particleArray[i].position).magnitude;
            Speed = Distance / MoveTime;
            particleArray[i].position += normalize * Speed;

        }
    }

    private Vector2 RotationMatrix(Vector2 v, float angle)
    {
        var x = v.x;
        var y = v.y;
        var sin = Mathf.Sin(Mathf.PI * angle / 180);
        var cos = Mathf.Cos(Mathf.PI * angle / 180);
        var newX = x * cos + y * sin;
        var newY = x * -sin + y * cos;
        return new Vector2((float)newX, (float)newY);
    }
}