using UnityEngine;
using TMPro;

public class ShotShell : MonoBehaviour
{
    private InputSystem_Actions isa;

    public GameObject shellPrefab;
    public AudioClip shotSound;
    public float shotSpeed;
    private float shotPower;
    public GameObject shotPoint;
    public int shellCount;
    public TextMeshProUGUI shellLabel;

    // ★追加
    private int maxShell = 20; // 最大弾数
    public AudioClip itemSound;
    public GameObject effectPrefab;

    void Start()
    {
        isa = new InputSystem_Actions();
        isa.Enable();

        shellLabel.text = "" + shellCount;
    }

    void Update()
    {
        if (shellCount < 1)
        {
            return;
        }

        if (isa.Player.Shot.triggered)
        {
            shellCount -= 1;
            shellLabel.text = "" + shellCount;

            GameObject shell = Instantiate(shellPrefab, shotPoint.transform.position, Quaternion.identity);
            Rigidbody shellRb = shell.GetComponent<Rigidbody>();
            shellRb.AddForce(transform.forward * shotSpeed);
            Destroy(shell, 3.0f);
            AudioSource.PlayClipAtPoint(shotSound, transform.position);
        }

        if (isa.Player.Shot2.IsPressed())
        {
            shotPower += 15f;

            if (shotPower > 900f)
            {
                shotPower = 900f;
            }
        }

        if (isa.Player.Shot2.WasReleasedThisFrame())
        {
            shellCount -= 1;
            shellLabel.text = "" + shellCount;

            GameObject shell = Instantiate(shellPrefab, shotPoint.transform.position, Quaternion.identity);
            Rigidbody shellRb = shell.GetComponent<Rigidbody>();

            shellRb.useGravity = true;

            shellRb.AddForce((transform.forward + new Vector3(0, 0.5f, 0)) * shotPower);
            AudioSource.PlayClipAtPoint(shotSound, transform.position);

            Destroy(shell, 5.0f);

            shotPower = 0;
        }
    }

    // ★追加
    private void OnTriggerEnter(Collider other)
    {
        if (other.CompareTag("ShellItem"))
        {
            // アイテムを消す
            Destroy(other.gameObject);

            // 効果音を出す
            AudioSource.PlayClipAtPoint(itemSound, transform.position);

            // エフェクトを出す
            GameObject effect = Instantiate(effectPrefab, other.transform.position, Quaternion.identity);

            // エフェクトを消す
            Destroy(effect, 1.0f);

            // Shellを「５」回復させる
            shellCount += 5;
            shellLabel.text = "" + shellCount;

            // 弾数が最大値を超えないように制限する
            if (shellCount > maxShell)
            {
                shellCount = maxShell;
                shellLabel.text = "" + shellCount;
            }
        }
    }
}
C#