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

public class LoadTilesFromAssetBundles : MonoBehaviour
{
    private OnlineMaps map;
    private AssetBundleCreateRequest bundleLoadRequest;
    private AssetBundle myLoadedAssetBundle;
    private static bool logAllPaths = true;

    private void Start()
    {
        map = OnlineMaps.instance;

        // Subscribe to the tile download event.
        OnlineMapsTileManager.OnStartDownloadTile += OnStartDownloadTile;
    }

    private void OnStartDownloadTile(OnlineMapsTile tile)
    {
        StartCoroutine(LoadTile(tile));
    }

    private IEnumerator LoadTile(OnlineMapsTile tile)
    {
        // Here your code to load tile texture from any source.
        if (myLoadedAssetBundle == null)
        {
            if (bundleLoadRequest == null) yield return LoadBundle();
            else
            {
                while (myLoadedAssetBundle == null)
                {
                    yield return null;
                }
            }
        }

        string path = string.Format("onlinemapstiles/{0}/{1}/{2}.png", tile.zoom, tile.x, tile.y);
        if (!myLoadedAssetBundle.Contains(path))
        {
            tile.status = OnlineMapsTileStatus.error;
        }

        Texture2D tileTexture = myLoadedAssetBundle.LoadAsset<Texture2D>(path);

        // Apply your texture in the buffer and redraws the map.
        if (map.control.resultIsTexture)
        {
            // Apply tile texture
            (tile as OnlineMapsRasterTile).ApplyTexture(tileTexture as Texture2D);

            // Send tile to buffer
            map.buffer.ApplyTile(tile);

            // Destroy the texture, because it is no longer needed.
            OnlineMapsUtils.Destroy(tileTexture);
        }
        else
        {
            // Send tile texture
            tile.texture = tileTexture;

            // Change tile status
            tile.status = OnlineMapsTileStatus.loaded;
        }

        // Redraw map (using best redraw type)
        map.Redraw();
    }

    private IEnumerator LoadBundle()
    {
        bundleLoadRequest = AssetBundle.LoadFromFileAsync(Path.Combine(Application.persistentDataPath, "onlinemapstiles"));
        yield return bundleLoadRequest;
        myLoadedAssetBundle = bundleLoadRequest.assetBundle;
        string[] assetNames = myLoadedAssetBundle.GetAllAssetNames();
        foreach (string s in assetNames) Debug.Log(s);
    }
}