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

public class TankHealth : MonoBehaviour
{
    [SerializeField]
    private GameObject effectPrefab1;
    [SerializeField]
    private GameObject effectPrefab2;
    public int tankHP;
    [SerializeField]
    private Text HPLabel;

    // ★追加
    // HPの最大値を設定する（最大値は自由）
    public int tankMaxHP = 5;

    void Start()
    {
        // ★追加
        tankHP = tankMaxHP;

        HPLabel.text = "HP:" + tankHP;
    }

    private void OnTriggerEnter(Collider other)
    {
        if (other.gameObject.tag == "EnemyShell")
        {
            tankHP -= 1;
            HPLabel.text = "HP:" + tankHP;

            Destroy(other.gameObject);

            if (tankHP > 0)
            {
                GameObject effect1 = Instantiate(effectPrefab1, transform.position, Quaternion.identity);
                Destroy(effect1, 1.0f);
            }
            else
            {
                GameObject effect2 = Instantiate(effectPrefab2, transform.position, Quaternion.identity);
                Destroy(effect2, 1.0f);
                this.gameObject.SetActive(false);
                Invoke("GoToGameOver", 1.5f);
            }
        }
    }

    void GoToGameOver()
    {
        SceneManager.LoadScene("GameOver");
    }

    // ★追加
    // publicをつけること（重要ポイント）
    public void AddHP(int amount)
    {
        tankHP += amount;

        // ここは何をコントロールしている考えてみましょう！
        if (tankHP > tankMaxHP)
        {
            tankHP = tankMaxHP;
        }

        HPLabel.text = "HP:" + tankHP;
    }
}

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

public class HPItem : MonoBehaviour
{
    [SerializeField]
    private GameObject effectPrefab;
    [SerializeField]
    private AudioClip getSound;
    private TankHealth th;
    private int reward = 3; // いくつ回復させるかは自由！

    private void OnTriggerEnter(Collider other)
    {
        if (other.gameObject.tag == "Player")
        {
            // Find()メソッドの使い方をマスターすること
            th = GameObject.Find("Tank").GetComponent<TankHealth>();

            // AddHP()メソッドを呼び出して「引数」にrewardを与えている。
            th.AddHP(reward);

            Destroy(gameObject);
            GameObject effect = Instantiate(effectPrefab, transform.position, Quaternion.identity);
            Destroy(effect, 0.5f);
            AudioSource.PlayClipAtPoint(getSound, transform.position);
        }
    }
}