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

public class AssetLoadHelper : MonoBehaviour
{
    public static AssetLoadHelper _Instance;
    private Dictionary<string, AssetBundle> abRes_Dir;

    string[] resList = { "weathertool", "model" };

    public bool isLoad
    {
        get
        {
            for (int i = 0; i < resList.Length; i++)
            {
                if (!abRes_Dir.ContainsKey(resList[i]))
                {
                    return false;
                }
            }
            return true;
        }
    }

    private void Awake()
    {
        _Instance = this;

        LoadAB_res();
    }

    private void LoadAB_res()
    {
        abRes_Dir = new Dictionary<string, AssetBundle>();
        foreach (var t in resList)
        {
            StartCoroutine(LoadAB(t));
        }
    }

    IEnumerator LoadAB(string _name)
    {
        string abPath = "/AB/";
        if (Application.isEditor) {
            abPath = "/ABW/";
        }
        UnityWebRequest www =
            UnityWebRequestAssetBundle.GetAssetBundle(Application.streamingAssetsPath + abPath + _name);
        yield return www.SendWebRequest();
        if (www.result != UnityWebRequest.Result.Success)
        {
            Debug.LogError(www.result);
        }
        else
        {
            AssetBundle ab= DownloadHandlerAssetBundle.GetContent(www);
            if (ab != null)
            {
                abRes_Dir.TryAdd(_name, ab);
            }
        }
        www.Dispose();
    }

    public T LoadAssets<T>(string abName, string resName) where T : UnityEngine.Object
    {
        T obj = null;
        if (!abRes_Dir.ContainsKey(abName))
        {
            Debug.LogError($"{abName}丢失");
        }
        else
        {
            if (typeof(T) == typeof(GameObject))
            {
                obj = Instantiate(abRes_Dir[abName].LoadAsset<T>(resName));
            }
            else
            {
                obj = abRes_Dir[abName].LoadAsset<T>(resName);
            }
        }
        return obj;
    }
}