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

public class CheckForGroundCollision : MonoBehaviour
{
    [NonSerialized] public bool isGrounded;
    [NonSerialized] public Vector3 collisionPosition;
    [NonSerialized] public Vector3 collisionNormal;
    [NonSerialized] public Collider collider;

    private bool sensorGround;

    private void FixedUpdate()
    {
        // 根据上一次物理模拟(Physics Update)结果设置isGround参数
        if(!sensorGround) 
        {
            isGrounded = false;
        }
        sensorGround = false;
    }

    void Collide(Collision collision)
    {
        if(collision.transform.root == transform.root) // 自己碰撞自己
        {
            return;
        }

        float surfaceAngel = Vector3.Angle(Vector3.up, collision.contacts[0].normal);

        collider = collision.collider;

        if (surfaceAngel > 75f) // wall 
        {

        } 
        else // ground
        {
            sensorGround = true;
            isGrounded = true;
            collisionPosition = collision.contacts[0].point;
            collisionNormal = collision.contacts[0].normal;
        }
    }

    public void OnCollisionEnter(Collision collision)
    {
        Collide(collision);
    }

    public void OnCollisionStay(Collision collision)
    {
        Collide(collision);
    }

}