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

public class Attacker : MonoBehaviour {

    [SerializeField]
    float hurtDuration = 20f;

    [SerializeField]
    float damage = 1f;

    [SerializeField, Header("Register to know when I attack")]
    UnityEventFloatArg Attack;

	// Use this for initialization
	void Start () {
        StartCoroutine(HurtPlayer());
	}
	
	// Update is called once per frame
	void Update () {
		
	}

    private void OnDestroy()
    {
        if (Attack != null)
            Attack.RemoveAllListeners();
    }

    public void AddAttackListener(UnityAction<float> action)
    {
        if (Attack == null)
            Attack = new UnityEventFloatArg();
        Attack.AddListener(action);
    }

    IEnumerator HurtPlayer()
    {
        if (Attack != null)
            Attack.Invoke(damage);

        // Pause for a bit
        yield return new WaitForSeconds(hurtDuration);

        // Start hurting player again
        yield return StartCoroutine(HurtPlayer());
    }
}