using UnityEngine;
using System.Collections;

public class NavTab : DGUI {

	public CallBackUtil.IntegerCallBack OnNavTabChanged;

	public Transform tabContainer;
	public NavTabButton[] tabBtns;

	public ViewStack viewStack;

	private int currentIndex = int.MinValue;
	private string[] titleArr;

	protected virtual void Awake()
	{
		tabContainer = transform.FindChild ("Tabs");

		tabBtns = new NavTabButton[tabContainer.childCount];
		for(int i=0; i<tabBtns.Length; i++)
		{
			NavTabButton btn = tabContainer.GetChild (i).gameObject.AddComponent<NavTabButton>();
			btn.OnClick = OnTabBtnClick;
			btn.enabled = false;
			tabBtns [i] = btn;
		}
		SetTitles (titleArr);
	}

	protected virtual void Start()
	{
		if(currentIndex == int.MinValue)
			navTabIndex = 0;
	}

	public void SetTitles(string[] titleArr)
	{
		this.titleArr = titleArr;

		if (titleArr == null)
			return;

		for(int i=0; i<tabBtns.Length; i++)
		{
			tabBtns [i].label.text = titleArr [i];
		}
	}

	public int navTabIndex
	{
		set{ 
			OnTabBtnClick (value);
		}
		get{ 
			return currentIndex;
		}
	}

	public void UnSelected()
	{
		OnTabBtnClick (-1);
	}

	private void OnTabBtnClick(int index)
	{
		if (currentIndex == index)
			return;

		for(int i=0; i<tabBtns.Length; i++)
		{
			NavTabButton btn = tabBtns [i];
			btn.enabled = i == index ? true : false;
		}

		currentIndex = index;

		if (viewStack != null)
			viewStack.viewIndex = currentIndex;

		if (OnNavTabChanged != null)
			OnNavTabChanged (index);
	}


}