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

public class FireMissile : MonoBehaviour {
	public GameObject missilePrefab;
	public float missileSpeed;
	public AudioClip fireSound;
	private int timeCount;
	private int maxPower = 300;
	private int shotPower;
	private Slider powerSlider;
	const int RecoveryTime = 10;
	private int counter;

	private Slider waitTimeSlider;

	void Start(){
		shotPower = maxPower;
		powerSlider = GameObject.Find ("PowerSlider").GetComponent<Slider> ();
		powerSlider.maxValue = maxPower;
		powerSlider.value = shotPower;

		waitTimeSlider = GameObject.Find ("WaitTimeSlider").GetComponent<Slider> ();
		waitTimeSlider.maxValue = RecoveryTime;
		waitTimeSlider.value = RecoveryTime;
			
	}

    // ★★修正
    // どのような仕組みで「手動発射→自動発射」に変更できるのか確認してください。
	void Update () {

		if (shotPower <= 0 && counter <= 0) {
			StartCoroutine (RecoverPower());
		}

		timeCount += 1;

        if (shotPower <= 0)
        {
            return;
        }

        shotPower -= 1;

        powerSlider.value = shotPower;

        if (timeCount % 5 == 0)
        {
            GameObject missile = Instantiate(missilePrefab, transform.position, Quaternion.identity) as GameObject;
            Rigidbody missileRb = missile.GetComponent<Rigidbody>();
            missileRb.AddForce(transform.forward * missileSpeed);
            AudioSource.PlayClipAtPoint(fireSound, transform.position);
            Destroy(missile, 2.0f);
        }
	}

	IEnumerator RecoverPower(){
		counter = RecoveryTime;

		while (counter > 0) {
			yield return new WaitForSeconds (1.0f);
			counter -= 1;
			waitTimeSlider.value = counter;
		}

		shotPower = maxPower;
		powerSlider.value = shotPower;

		waitTimeSlider.value = RecoveryTime;
	}

	public void ResetPower(){
		shotPower = maxPower;
		powerSlider.value = shotPower;
		counter = 0;

		waitTimeSlider.value = RecoveryTime;
	}
}