using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEngine.SceneManagement;

namespace MyFrameworkPure
{
    public class ResourceTool
    {
        /// <summary>
        /// 载入资源,通过资源路径判断是Resource加载还是Assetbundle加载
        /// </summary>
        /// <param equimpentName="path"></param>
        /// <returns></returns>
        public static UnityEngine.Object LoadAssets(string path)
        {
            UnityEngine.Object obj = null;
            if (Path.IsPathRooted(path))
            {
                AssetBundle ab = AssetBundle.LoadFromFile(path);
                if (!ab)
                {
                    Debug.LogError("不存在Assetbundle资源:" + path);
                }
                else
                {
                    string name = ab.GetAllAssetNames()[0];
                    obj = ab.LoadAsset(name);
                }
            }
            else
            {
                obj = Resources.Load(path);
                if (!obj)
                {
                    Debug.LogError("Resource下不存在资源:" + path);
                }
            }
            return obj;
        }

        /// <summary>
        /// 直接实例化资源
        /// </summary>
        /// <param equimpentName="path"></param>
        /// <param equimpentName="parent"></param>
        /// <returns></returns>
        public static UnityEngine.GameObject Instantiate(string path, Transform parent = null)
        {
            UnityEngine.Object obj = LoadAssets(path);
            if (obj != null)
            {
                return UnityEngine.Object.Instantiate(obj, parent) as GameObject;
            }
            return null;
        }

        /// <summary>
        /// 直接实例化资源
        /// </summary>
        /// <param equimpentName="path"></param>
        /// <param equimpentName="position"></param>
        /// <param equimpentName="rotation"></param>
        /// <param equimpentName="parent"></param>
        /// <returns></returns>
        public static UnityEngine.GameObject Instantiate(string path, Vector3 position, Quaternion rotation, Transform parent = null)
        {
            UnityEngine.Object obj = LoadAssets(path);
            if (obj != null)
            {
                return UnityEngine.Object.Instantiate(obj, position, rotation, parent) as GameObject;
            }
            return null;
        }

        /// <summary>
        /// 从网络路径异步加载资源
        /// </summary>
        /// <param equimpentName="url"></param>
        /// <returns></returns>
        public static IEnumerator InstantiateFromUrl(string url)
        {
            using (WWW www = new WWW(url))
            {
                yield return www;
                if (string.IsNullOrEmpty(www.error))
                {
                    AssetBundle assetbundle = www.assetBundle;
                    string name = assetbundle.GetAllAssetNames()[0];
                    UnityEngine.Object obj = assetbundle.LoadAsset(name);
                    GameObject go = UnityEngine.Object.Instantiate(obj) as GameObject;
                    go.name = go.name.Replace("(Clone)", "");
                    assetbundle.Unload(false);
                }
                else
                {
                    Debug.LogError(www.error);
                }
            }

        }

        /// <summary>
        /// 从网络路径异步加载场景
        /// </summary>
        /// <param equimpentName="url"></param>
        /// <param equimpentName="loadModel"></param>
        /// <returns></returns>
        public static IEnumerator LoadLevelFromUrl(string url, LoadSceneMode loadModel = LoadSceneMode.Single)
        {
            using (WWW www = new WWW(url))
            {
                yield return www;
                if (string.IsNullOrEmpty(www.error))
                {
                    AssetBundle assetbundle = www.assetBundle;
                    //string sceneName = url.Substring(url.LastIndexOf('/') + 1).Replace(".unity3d", "");
                    string sceneName = Path.GetFileNameWithoutExtension(url);
                    Debug.Log("即将加载场景：" + sceneName);
                    SceneManager.LoadScene(sceneName, loadModel);
                    yield return new WaitUntil(() => SceneManager.GetSceneByName(sceneName).isLoaded);
                    SceneManager.SetActiveScene(SceneManager.GetSceneByName(sceneName));
                    assetbundle.Unload(false);
                }
                else
                {
                    Debug.LogError(www.error);
                }
            }
        }
    }

}