using UnityEngine;
using System.Collections;

public class UVAnimCtrl : MonoBehaviour
{
	public bool loop=true;
    public float scrollSpeed = 5;
    public float countX = 4;
    public float countY = 4;

    private float offsetX = 0.0f;
    private float offsetY = 0.0f;
    private Vector2 singleTextureSize;
    private float _frame = 0.0f;
	private float stepx;
	private float stepy;
	public bool isOffset = false;
	public float ox = 0.0f;
	public float oy = 0.0f;

    private bool _isEnable = true;
    public bool isEnable
    {
        get { return _isEnable; }
        set {
            _isEnable = value;
            if (value) enabled = true;
        }
    }
    void Awake()
    {   
        singleTextureSize = new Vector2(1.0f / countX, 1.0f / countY);
        GetComponent<Renderer>().material.mainTextureScale = singleTextureSize;
		foreach (Material i in GetComponent<Renderer>().materials)
        {
            
                i.mainTextureScale = singleTextureSize;
           
        }
    }

    /// <summary>
    /// Update用于普通更新的情况，与enable和isEnable搭配使用；与UpdateFrame互斥
    /// </summary>
    void Update()
    {
        if (_isEnable) _OnUpdate();
        else this.enabled = false;
    }

    public void UpdateFrame()
    {
        _OnUpdate();
    }

    private void _OnUpdate()
    {
		
		if(isOffset)
		{
			if(loop)
			{
				if(offsetX <-1)	offsetX +=1;
				if(offsetY < -1) offsetY +=1;
				if(offsetX >1)	offsetX -=1;
				if(offsetY >1) offsetY -=1;
			}
			else
			{
				if(offsetX <-1)	return;
				if(offsetY < -1) return;
				if(offsetX >1)	return;
				if(offsetY >1) return;
			}
			offsetX += ox;
			offsetY += oy;

		}
		else
		{
			if (stepy >=countY){ 
				if(loop){
					stepy = 0f;
				}
				else
				{
					return;
				}
				
			}
            _frame += Time.deltaTime;
            stepx = Mathf.Floor(_frame * scrollSpeed);
            offsetX = stepx / countX;
			if (stepx >= countX)
			{
				stepy+=1;
				_frame = 0;
			}
			offsetY = stepy / countY;
		
            //offsetY = -(_frame - _frame % countX) / countY / countX;
		}
		foreach (Material i in GetComponent<Renderer>().materials)
        {
            i.SetTextureOffset("_MainTex", new Vector2(offsetX, offsetY));
        }
    }
}