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

public class Health : MonoBehaviour
{
    public Image health;
    public bool isMainChar;
    public float currentHealth, maxHealth;
    private CapsuleCollider capsule;
    private Vector3 constPos;

    void Awake()
    {
        health = (Instantiate(Resources.Load("healthPref")) as GameObject).GetComponent<Image>();
        health.transform.SetParent(GameObject.Find("Canvas").transform);
        health.rectTransform.localScale=new Vector3(1,1,1);
        constPos=new Vector3(20*1.5f+health.rectTransform.rect.width/2f, Screen.height-(40+health.rectTransform.rect.height), 0);
    }

    void Start ()
    {
        health.fillAmount = 1;
        health.color = Color.green;
        capsule = GetComponent<CapsuleCollider>();
    }

    // Update is called once per frame
    void Update ()
    {
        health.fillAmount = (1/maxHealth)*currentHealth;
        health.color = Color.Lerp(Color.red, Color.green, health.fillAmount);

        if(!isMainChar)
        if (Vector3.Dot(Camera.main.transform.forward, (transform.position - Camera.main.transform.position)) < 1f)
        {
            health.enabled = false;
        }
        else
        {
            health.enabled = true;
        }
    }

    void LateUpdate()
    {
        if (!isMainChar)
        {
            Vector3 pos2d = transform.position;
            pos2d.y += (capsule.height/2f+capsule.center.y);

            pos2d = Camera.main.WorldToScreenPoint(pos2d);
            pos2d.y += 10;
            health.rectTransform.position = pos2d;
        }
        else
        {
            health.rectTransform.position = constPos;
        }
    }

    public void SetHealth(float current, float max)
    {
        currentHealth = current;
        maxHealth = max;
    }
}