RubberBall.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using UnityEngine.SceneManagement;

public class RubberBall : MonoBehaviour
{
	[SerializeField] 
	GameObject Rubberball;

	Rigidbody rb;

	AudioSource audioSource;

	public float serve_speed;
	public float serve_forward;
	public float serve_up;
	public float timelag;

	[HideInInspector]
	public bool inactive;

	[HideInInspector]
	public bool after_hit = true;

	public bool front_col;
	public int floor_col;

	bool playerHit;

	public AudioClip criticalhit_sound;
	public AudioClip hit_sound;
	public AudioClip floor_sound;
	public AudioClip wall_sound;
	public AudioClip ceiling_sound;
	public AudioClip shoot_sound;
	public AudioClip lose;
	public AudioClip notification;

	public Raq_GameManager raq_gamemanager;
	Raq_GameManager gamemanagerScript;

	void Start()
	{
		rb = this.GetComponent<Rigidbody>();
		raq_gamemanager = GameObject.FindObjectOfType<Raq_GameManager>();
		gamemanagerScript = raq_gamemanager.GetComponent<Raq_GameManager>();

		audioSource = GetComponent<AudioSource>();
	}

  	void Update()
	{
		if (!gamemanagerScript.befServe)
    	{
			Out();
		}
	}

	private void OnEnable()
	{
		EventManager.OnRaqplayerServe += HandlePlayerServe;
		EventManager.OnRaqplayerHit += HandlePlayerHit;
	}

	private void OnDisable()
	{
		EventManager.OnRaqplayerServe -= HandlePlayerServe;
		EventManager.OnRaqplayerHit -= HandlePlayerHit;
	}

	private void HandlePlayerServe()
	{
		// プレイヤーの Serve時の処理
		audioSource.PlayOneShot(shoot_sound);
		rb.AddForce((transform.forward * serve_forward + transform.right + transform.up * serve_up) * serve_speed, ForceMode.VelocityChange);
		gamemanagerScript.befServe = false;

		front_col = false;
		floor_col = 0;

		after_hit = true;
		Invoke(nameof(Cancel_Afthit), timelag);
	}

	//on collision, check what we hit and show an effect on the ground
	void OnCollisionEnter(Collision other)
	{
		if (other.gameObject.CompareTag("FrontWall"))
		{
			front_col = true;
			floor_col = 0;

			if (rb.velocity.z >20 || rb.velocity.z < -20)
      		{
				audioSource.PlayOneShot(criticalhit_sound);
			}
			else if (rb.velocity.z >= -20 && rb.velocity.z <= 20)
      		{
				audioSource.PlayOneShot(hit_sound);
			}
		}

		else if (other.gameObject.CompareTag("Floor"))
    	{
			audioSource.PlayOneShot(floor_sound);
			floor_col += 1;
		}

		else if (other.gameObject.CompareTag("Ceiling"))
		{
			audioSource.PlayOneShot(ceiling_sound);
		}

		else if (other.gameObject.CompareTag("Wall"))
		{
			audioSource.PlayOneShot(wall_sound);
		}

		if (inactive)
    	{
			return;
		}
	}

	private void HandlePlayerHit(Vector3 direction)
	{
		audioSource.PlayOneShot(shoot_sound);
		rb.velocity = direction;

		front_col = false;
		floor_col = 0;

		after_hit = true;
		Invoke(nameof(Cancel_Afthit), timelag);
	}

	public void Cancel_Afthit()
	{
		after_hit = false;
	}

	public void Out()
	{
		// ショットする前にボールが床に２回以上に着いてしまった場合
		if (front_col && floor_col >= 2 && !gamemanagerScript.befServe)
   		{
			floor_col = 0;
			raq_gamemanager.CourtTriggered(front_col);
		}
		// ショットしたボールが前の壁に届く前に床に着いてしまった場合（自分）
		else if (GetLastHit() && !front_col && floor_col >= 1 && !gamemanagerScript.befServe)
    	{
			floor_col = 0;
			raq_gamemanager.CourtTriggered(front_col);
		}
		// ショットしたボールが前の壁に届く前に床に着いてしまった場合（相手プレイヤー）
		else if (!GetLastHit() && !front_col && floor_col >= 2 && !gamemanagerScript.befServe)
		{
			floor_col = 0;
			raq_gamemanager.CourtTriggered(front_col);
		}
	}

	//set the last hit to player/opponent (to remember who hit the ball when the ball is out)
	public void SetLastHit(bool player)
	{
		this.playerHit = player;
	}

	//retrieve the last hit info
	public bool GetLastHit()
	{
		return this.playerHit;
	}
}