using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.U2D;

public class LoadFromAssetBundle : MonoBehaviour
{
    List<string> tags = new List<string>();

    void Awake()
    {
#if !ENABLE_WEB_REQUEST_ASSET_BUNDLE
        Debug.Log("Please enable UnityWebRequestAssetBundle Module from PackageManager");
#endif
    }

#if ENABLE_WEB_REQUEST_ASSET_BUNDLE
    void OnEnable()
    {
        SpriteAtlasManager.atlasRequested += RequestLateBindingAtlas;
        SpriteAtlasManager.atlasRegistered += AtlasRegistered;
    }

    void OnDisable()
    {
        SpriteAtlasManager.atlasRequested -= RequestLateBindingAtlas;
        SpriteAtlasManager.atlasRegistered -= AtlasRegistered;
    }

    void RequestLateBindingAtlas(string tag, System.Action<SpriteAtlas> action)
    {
        if (null == tags.FirstOrDefault(stringToCheck => stringToCheck.Contains(tag)))
        {
            tags.Add(tag);
            StartCoroutine(LoadAssetBundle(tag, action));
        }
    }

    IEnumerator LoadAssetBundle(string tag, System.Action<SpriteAtlas> callback)
    {
        var assetbundleToLoad = "atlasbundle";

        var loadOp = UnityWebRequestAssetBundle.GetAssetBundle("file://" + Application.streamingAssetsPath + "/" + assetbundleToLoad);
        yield return loadOp.SendWebRequest();

        var ab = DownloadHandlerAssetBundle.GetContent(loadOp);
        if (null != ab)
        {
            var sa = ab.LoadAsset<SpriteAtlas>("fromassetbundle.spriteatlasv2");
            callback(sa);
            Debug.Log("AssetBundle : " + tag + " has Atlas " + sa.name);
        }
    }

    void AtlasRegistered(SpriteAtlas spriteAtlas)
    {
        Debug.LogFormat("Registered {0}.", spriteAtlas.name);
    }
#endif
}