using UnityEngine;
using System.Collections;
using System;


public class HPBar : MonoBehaviour {

    public static bool Enabled = true;
    static bool TextEnabled = false;

    public GUITexture BackTexture;
    public GUITexture ForeTexture;
    public GUIText StatusText;

    Entity entity;
    public float height = 10.0f;

    float halfWidth = 1.0f;
    float width;

    Entity m_Entity;

    /// <summary>
    /// Current HP Pct of the attached entity.
    /// 1.0 = 100%
    /// </summary>
    float HpPct
    {
        get
        {
            if (m_Entity == null) return 1.0f;
            return m_Entity.HpPct;
        }
    }

    public string Status
    {
        set
        {
            if (!HPBar.Enabled || !HPBar.TextEnabled) return;

            //if (StatusText == null && StatusText != null) StatusText = GUIText.Instantiate(StatusText) as GUIText;
            //if (StatusText != null) StatusText.text = value;
        }
    }

    // Use this for initialization
    void Start ()
    {
        if (!HPBar.Enabled) return;

        if (false && transform.parent != null)
        {
            if (transform.parent.GetComponent<Entity>() != null)
            {
                m_Entity = transform.parent.GetComponent<Entity>();
            }
        }

        //BackTexture = GUITexture.Instantiate(BackTexture, Vector3.zero, Quaternion.identity) as GUITexture;
        //ForeTexture = GUITexture.Instantiate(ForeTexture, new Vector3(0, 0, 1f), Quaternion.identity) as GUITexture;
        entity = gameObject.GetComponent<Entity>();

        width = ForeTexture.pixelInset.width;
        halfWidth = BackTexture.pixelInset.width / 2f;

        if (TextEnabled && StatusText != null)
        {
            //StatusText = GUIText.Instantiate(StatusText) as GUIText;
            StatusText.material.color = Color.red;
        }

    }

    // Update is called once per frame
    void Update()
    {
        if (!HPBar.Enabled) return;

        if (m_Entity == null || m_Entity.transform == null)
        {
            Destroy (this);
            return;
        }
        //transform.position = Vector3.zero;
        //Vector2 wantedPos = Camera.main.transform.InverseTransformPoint(gameObject.transform.position);
        Vector2 wantedPos = Camera.main.WorldToScreenPoint(m_Entity.transform.position + (m_Entity.transform.up * height));

        BackTexture.pixelInset = new Rect(wantedPos.x - halfWidth, wantedPos.y, BackTexture.pixelInset.width, BackTexture.pixelInset.height);
        BackTexture.transform.position = new Vector3(0, 0, m_Entity.transform.position.z - .01f);
        ForeTexture.transform.position = new Vector3(0, 0, m_Entity.transform.position.z);
        //float hpPct = (float)entity.GetHP / (float)entity.MaxHP;
        int iWidth = Convert.ToInt32(width * HpPct);
        ForeTexture.pixelInset = new Rect(wantedPos.x - halfWidth + 1, wantedPos.y + 1, iWidth, ForeTexture.pixelInset.height);

        Vector2 wantedStatusPos = Camera.main.WorldToViewportPoint(gameObject.transform.position);

        if (TextEnabled && StatusText != null)
        {
            StatusText.transform.position = new Vector2(wantedStatusPos.x, wantedStatusPos.y);
        }
    }

    void OnDestroy()
    {
        if (!HPBar.Enabled) return;

        Destroy(BackTexture);
        Destroy(ForeTexture);
        if (TextEnabled) Destroy(StatusText);
    }

    internal void SetEntity(Entity entity)
    {
        m_Entity = entity;
    }
}