using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using System;
using System.IO;
using UnityEngine.UI;


public class WebImage
{

    public string identifyId;
    public virtual void SetImage(Texture2D texture)
    {

    }
}

public class WebRawImage: WebImage
{

    public RawImage mRawImage;
    public override void SetImage(Texture2D texture)
    {
        if (texture == null)
        {
            mRawImage.texture = texture;
            mRawImage.enabled = false;
        }
        else
        {
            mRawImage.texture = texture;
            mRawImage.enabled = true;
        }
    }

    public WebRawImage(RawImage mRawImage, string web_url)
    {
        this.mRawImage = mRawImage;
        this.identifyId = web_url;
    }
}

public class WebSprite: WebImage
{

    public SpriteRenderer mRawImage;
    public override void SetImage(Texture2D texture)
    {
        if (texture == null)
        {
            mRawImage.sprite = null;
            mRawImage.gameObject.SetActive(false);
        }
        else
        {
            mRawImage.sprite = Sprite.Create(texture, new Rect(0,0, texture.width, texture.height), new Vector2(0.5f,0.5f));
            if(texture.width>texture.height)
            {
                mRawImage.transform.localScale = Vector3.one * 0.1f * (texture.width / 1024f);
            }
            else
            {
                mRawImage.transform.localScale = Vector3.one * 0.1f * (texture.height / 1024f);
            }
            mRawImage.gameObject.SetActive(true);
        }
    }

    public WebSprite(SpriteRenderer mRawImage, string web_url)
    {
        this.mRawImage = mRawImage;
        this.identifyId = web_url;
    }
}

public class WebImageTool: MonoBehaviour
{


    private string format_name = "{0}/{1}";

    private static WebImageTool _instance = null;
    public static WebImageTool Instance
    {
        get
        {
            if (_instance == null)
            {
                GameObject go = new GameObject();
                go.name = "WebImageTool";
                DontDestroyOnLoad(go);
                _instance = go.AddComponent<WebImageTool>();
            }
            return _instance;
        }
    }

    public void LoadImage(WebRawImage img)
    {
        if(img.identifyId == null || img.identifyId.Equals(""))
        {
            img.SetImage(null);
            return;
        }
        StartCoroutine(LoadTexture(img));
    }

    public void LoadImage(WebSprite img)
    {
        if (img.identifyId == null || img.identifyId.Equals(""))
        {
            img.SetImage(null);
            return;
        }
        StartCoroutine(LoadTexture(img));
    }

    private string LocalURL(string url)
    {
        var strusers2 = url.Split(new[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
        string str1 = string.Join("/", strusers2);//array为数组 
        return string.Format(format_name, GameEnum.asset_path, str1);
    }

    /// <summary>
    /// 判断是否本地有缓存,如果有则读取本地的资源，否则读取网络资源
    /// </summary>
    /// <param name="url"></param>
    /// <returns></returns>
    private IEnumerator LoadTexture(WebImage img)
    {
        if (!string.IsNullOrEmpty(GamePlayerData.Instance.url_image_str))
        {
            if (!File.Exists(LocalURL(img.identifyId)))
            {
                yield return LoadNetWorkTexture(img);
            }
            else
            {
                yield return LoadLocalTexture(img);
            }
        }
    }

    /// <summary>
    /// 本地已缓存
    /// </summary>
    /// <param name="url"></param>
    /// <returns></returns>
    private IEnumerator LoadLocalTexture(WebImage img)
    {
        //已在本地缓存  
        string filePath = "file:///" + LocalURL(img.identifyId);
        CDebug.Log("本地文件路径 " + filePath);
        WWW www = new WWW(filePath);
        yield return www;
        img.SetImage(www.texture);
    }

    /// <summary>
    /// 本地未缓存
    /// </summary>
    /// <param name="url"></param>
    /// <returns></returns>
    private IEnumerator LoadNetWorkTexture(WebImage img)
    {
        string full_url =  string.Format(format_name, GamePlayerData.Instance.url_image_str, img.identifyId);
        CDebug.Log("full_url : "  + full_url);
        string img_url = (new Uri(full_url)).AbsoluteUri;
        CDebug.Log(img_url);
        WWW www = new WWW(img_url);
        yield return www;
        CDebug.Log("尝试网络加载");

#if UNITY_EDITOR || UNITY_STANDALONE_WIN
        if (!Directory.Exists(GameEnum.asset_path))
        {
            Directory.CreateDirectory(GameEnum.asset_path);//创建新路径
        }
#endif
        try
        {
            //判断网络状态
            if (Application.internetReachability != NetworkReachability.NotReachable)
            {
                //Debug.Log(Application.internetReachability);
                img.SetImage(www.texture);
                //将图片保存至缓存路径  
                byte[] pngData = www.texture.EncodeToPNG();
                string png_path = LocalURL(img.identifyId);
                string[] path_ary = png_path.Split('/');
                path_ary[path_ary.Length - 1] = "";
                string file_path = string.Join("/", path_ary);//array为数组 
                if (!Directory.Exists(file_path))
        {
                    Directory.CreateDirectory(file_path);//创建新路径
                }
                File.WriteAllBytes(png_path, pngData);
            }
        }
        catch
        {
            Debug.Log("网络资源本地失败");
        }
    }
}