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

public class TankHealth : MonoBehaviour {

	// ★改良
	// 「ゲーム開始時点のHP」を入れる箱
	public float initialPlayerHP;

	// ★改良（ポイント）
	// 「現在のHP」を入れる箱
	// 「static」を付けるとシーンが変わっても「箱の中の情報を保持」できる。
	public static float currentPlayerHP = 30;

	// ★この２つはコメントアウト
	//public const int PlayerHP = 30;
	//float HP = PlayerHP;


	//public Text PlayerHPLabel;
	public GameObject bombEffect1;
	public GameObject bombEffect2;
	private Slider slider;

	void Start () {
		//PlayerHPLabel.text = "HP: " + HP;
		slider = GameObject.Find ("TankHPSlider").GetComponent<Slider> ();

		// ★下記の２行を追加（ポイント）
		// ゲーム開始時点は「currentPlayerHP」の情報を使う。
		initialPlayerHP = currentPlayerHP;
		slider.value = initialPlayerHP;

	}
		
	public void AddplayerHP(int amount){

		// ★変更・・・「HP」を全て「currentPlayerHP」に変更する。
		currentPlayerHP += amount;
		if (currentPlayerHP >= 30)
			currentPlayerHP = 30;
		//PlayerHPLabel.text = "HP: " + HP;
		slider.value = currentPlayerHP;
	}

	void OnTriggerEnter(Collider other){
		if (other.CompareTag ("EnemeyShell")) {
			currentPlayerHP = currentPlayerHP - 1;
			Handheld.Vibrate ();
		
			//PlayerHPLabel.text = "HP: " + HP;
			slider.value = currentPlayerHP;
			Destroy (other.gameObject);
			if (currentPlayerHP > 0) {
				GameObject effect1 = Instantiate (bombEffect1, transform.position, Quaternion.identity) as GameObject;
				Destroy (effect1, 3.0f);
			} else {
				GameObject effect2 = Instantiate (bombEffect2, transform.position, Quaternion.identity) as GameObject;
				Destroy (effect2, 1.0f);
				Destroy (other.gameObject);
				//gameObject.SetActive (false);
				Destroy (this.gameObject);
				//Invoke ("SceneChange", 0.0f);
				SceneManager.LoadScene ("GameOver");
			}
		} else if (other.CompareTag ("EnemeyShellBoss")) {
			currentPlayerHP = currentPlayerHP - 1.5f;
			//PlayerHPLabel.text = "HP: " + HP;
			slider.value = currentPlayerHP;
			if (currentPlayerHP > 0) {
				GameObject effect1 = Instantiate (bombEffect1, transform.position, Quaternion.identity) as GameObject;
				Destroy (effect1, 1.0f);
			} else {
				GameObject effect2 = Instantiate (bombEffect2, transform.position, Quaternion.identity) as GameObject;
				Destroy (effect2, 1.0f);
				Destroy (other.gameObject);
				//	gameObject.SetActive (false);
				Destroy (this.gameObject);
				//Invoke ("SceneChange", 0.0f);
				SceneManager.LoadScene ("GameOver");
			}
		} else if (other.CompareTag ("Mine")) {
			currentPlayerHP = currentPlayerHP - 3f;
			slider.value = currentPlayerHP;
		} else if (other.CompareTag ("PlayerDestroy")) {
			currentPlayerHP = currentPlayerHP - 3f;
			slider.value = currentPlayerHP;
			if (currentPlayerHP > 0) {
				GameObject effect1 = Instantiate (bombEffect1, transform.position, Quaternion.identity) as GameObject;
				Destroy (effect1, 1.0f);
			} else {
				GameObject effect2 = Instantiate (bombEffect2, transform.position, Quaternion.identity) as GameObject;
				Destroy (effect2, 1.0f);
				Destroy (other.gameObject);
				Destroy (this.gameObject);
				SceneManager.LoadScene ("GameOver");
			}
		}
	}
}