using UnityEngine;
using System.Collections;


public delegate void HealthDelegate();
public delegate void HealthDamageDelegate(float damage, Object source, Vector3? worldPoint);

public class Health : MonoBehaviour {
	public float value = 100;
	public bool destroyed = false;
	public event HealthDelegate Destroyed;
    public event HealthDamageDelegate DamageApplied;
    public RandomSoundPlayer deathPlayer;

    protected virtual void OnDamageApplied(float damage, Object source, Vector3? worldpoint) {
        HealthDamageDelegate handler = DamageApplied;
        if (handler != null) {
            handler(damage, source, worldpoint);
        }

    }

    public bool Dead{
		get{return value <= 0.0f;}
	}

	protected virtual void OnDestroyed ()
	{
	    if (deathPlayer != null) {
	        deathPlayer.Play();
	    }
		var handler = Destroyed;
		if (handler != null)
			handler ();
	}

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

	void OnGUI(){
		var pt = Camera.main.WorldToScreenPoint(transform.position);
		pt.y =  Camera.main.pixelHeight - pt.y;
		//GUI.Label(new Rect(pt.x,pt.y, 100,30), "Health: " + health);
	}

	public void ApplyDamage(float damage, Object source = null, Vector3? worldPoint = null){
		if(!destroyed) {
            Debug.LogFormat("Apply damage {0} to object {1}", damage, name);
		    OnDamageApplied(damage, source, worldPoint);
			value -= Mathf.Clamp(Mathf.Abs(damage), 0, value);

			if(value <= 0.0f){
				destroyed = true;
				OnDestroyed();
			}
		}
	}
}