using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.IO;
using AIPagedLod;
using UnityEngine.Networking;
using LitJson;

public class DownloadTileSetManager : MonoBehaviour
{
    public static DownloadTileSetManager mInstance;
    public List<UnityWebRequest> mDownloadWWWList = new List<UnityWebRequest>();
    public int mMaxCoroutineCount = 2;
    public int mCurrentCoroutineCount = 0;
    void Awake()
    {
        mInstance = this;
    }

    void Update()
    {
        mDownloadWWWList.RemoveAll(item => item.isDone);
        mCurrentCoroutineCount = mDownloadWWWList.Count;
    }

    public bool CanDownload()
    {
        return mDownloadWWWList.Count < mMaxCoroutineCount;
    }

    public void StartDownloadTileSetJson(LoadDataFromUrl loader,TileUrlInfo info)
    {
        StartCoroutine(DownloadTileSetJson(loader,info));
    }

    public IEnumerator DownloadTileSetJson(LoadDataFromUrl loader, TileUrlInfo info)
    {
        string url = info.mTileSetUrl;
        UnityWebRequest www = UnityWebRequest.Get(url);
        www.timeout = 10;
        yield return www.SendWebRequest();
        if (www.isHttpError || www.isNetworkError)
        {
            Debug.Log(www.error + " " + url);
        }
        else
        {
            B3dmBasicInfo rootTileInfo = null;
            info.mBasicInfoDict = PagedLod.LoadTileSetJsonText(www.downloadHandler.text, ref rootTileInfo);
            info.mBasicInfo = rootTileInfo;
            string tileUrl = info.mTileSetUrl.Replace("tileset.json", "");
            info.mTileFileUrl = tileUrl + info.mBasicInfo.mContent + ".b3dm";
            loader.DoLoadTileSetFinished();
        }
    }
}