using UnityEngine;
using System.Collections;
using System.IO;

public class TextureWWWCacher : MonoBehaviour {


    WWW web;
    public string imgUrl;
    public string cacheFile = "superbanner.png";
     public Texture2D resultTexture;

    string bannerCache_key = "nt_current_banner_cache";

    string imageFile = "";
    // Use this for initialization
    public IEnumerator fetch () {

        yield return fetch(imgUrl,-1,-1);

    }


    //this one uses bannerName instead of url to see if we have cached it
    public  IEnumerator fetch (string bannerName,int resX,int resY) {


        imageFile = Application.persistentDataPath  + "/supperbanner.png";
        resultTexture = new Texture2D(0,0);


        string hasCachedKey = PlayerPrefs.GetString(bannerCache_key,"");
        if( bannerName != hasCachedKey ){

            Debug.Log("downloading image file " + imgUrl);
            //we should download this new version..

            WWW web = new WWW(imgUrl);
            yield return web;

            if(web.error == null)
            {
                /*if(resX>0){
                    web.texture.Resize(resX,resY);
                    web.texture.Apply();
                }*/
                byte[] image = web.texture.EncodeToPNG();
                File.WriteAllBytes(imageFile, image);
                PlayerPrefs.SetString(bannerCache_key,bannerName);
            }
            else{
                Debug.Log("error downloading image file:" + web.error);
                    resultTexture = null;

            }
        }
        else{
            Debug.Log("loading directly from cache");
        }

        if(resultTexture!= null){
            byte[] loadedImage = File.ReadAllBytes(imageFile);
            resultTexture.LoadImage(loadedImage);
            /*resultTexture.Resize(512,256);
            resultTexture.Apply();//*/
        }
    }

    // Update is called once per frame
    void Update () {

    }
}