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

public class DownloadFileManager : MonoBehaviour
{
    public static DownloadFileManager 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 StartDownloadTileFile(PagedLod lod,string baseUrl)
    {
        StartCoroutine(DownloadTileFile(lod, baseUrl));
    }

    public IEnumerator DownloadTileFile(PagedLod pagedLod, string baseUrl)
    {
        string url = baseUrl + "/" + pagedLod.mTileDirPath +"/" + 
            pagedLod.gameObject.name + PagedLodConfig.mInstance.GetFileSufix();
        UnityWebRequest www = UnityWebRequest.Get(url);
        www.timeout = 5;
        mDownloadWWWList.Add(www);
        yield return www.SendWebRequest();
        if (www.isHttpError || www.isNetworkError)
        {
            pagedLod.mIsRenderNodeLoaded = false;
            Debug.Log(www.error + " " + url);
        }
        else
        {
            B3dmFileLoader loader = new B3dmFileLoader();
            loader.LoadObjectMeshInfoFromData(www.downloadHandler.data);
            if(loader.mObjectInfoList.Count == 0)
            {
                pagedLod.mIsRenderNodeLoaded = false;
            }
            else
            {
                pagedLod.LoadRenderNode(loader);
            }
            loader.Dispose();
        }
    }

}