#define log
using System.IO;
using UnityEngine;
using System.Collections;
using System;

public enum FileType
{
    None,
    AudioCilp,
    String,
    Texture,
}
public enum FolderType
{
    None,
    StreamingAssets,
    PersistentData,
}

public class FileManager: MonoBehaviour
{
    /// <summary>
    /// 顯示各個資料夾路徑
    /// </summary>
    public void ShowPath()
    {
        log("dataPath: ======> " + Application.dataPath);
        log("persistentDataPath: ======> " + Application.persistentDataPath);
        log("streamingAssetsPath: ======> " + Application.streamingAssetsPath);
        log("temporaryCachePath: ======> " + Application.temporaryCachePath);
        
    }


    /// <summary>
    /// 將StreamingAssets裡的檔案複製到PersistentDataPath下
    /// </summary>
    public void CopyStreamingFileToPersistentDataPath(params string[] filePath)
    {
        if (Application.platform == RuntimePlatform.Android)                    //如果是Android平臺
        {
            foreach(string path in filePath)
            {
                StartCoroutine(CopyFile_Android(path));
            }
        }
        else if (Application.platform == RuntimePlatform.WindowsEditor)          //如果是Windows平臺
        {
            foreach (string path in filePath)
            {
                File.Copy(Application.streamingAssetsPath + "/" + path, Application.persistentDataPath + "/" + path, true);

                log("CopyMusic Success!" + "\n" + "Path: ======> " + Application.persistentDataPath + "/" + path);
            }
        }

    }

    
    /// <summary>
    /// 從StreamingAssets載入檔案
    /// </summary>
    public void LoadFileByStreamingAssets(string file,FileType fileType, Action<object> Callback)
    {
        FileType m_FileType = fileType;
        FolderType m_FolderType = FolderType.StreamingAssets;

        StartCoroutine(LoadFileIEnumerator(file, Callback, m_FileType, m_FolderType));
    }



    /// <summary>
    /// 從PersistentDataPath載入檔案
    /// </summary>
    public void LoadFileByPersistentDataPath(string file, FileType fileType, Action<object> Callback)
    {
        FileType m_FileType = fileType;
        FolderType m_FolderType = FolderType.PersistentData;

        StartCoroutine(LoadFileIEnumerator(file, Callback, m_FileType, m_FolderType));
    }
    
    
    //===============================================================================

    /// <summary>
    /// 載入檔案
    /// </summary>
    IEnumerator LoadFileIEnumerator(string file,Action<object> Callback, FileType fileType, FolderType m_FolderType)
    {
        string filePath = "";

        switch (m_FolderType)
        {
            case FolderType.StreamingAssets:
                if (Application.platform == RuntimePlatform.Android)                    //如果是Android平臺
                {
                    filePath = Application.streamingAssetsPath + "/" + file;
                }
                else if (Application.platform == RuntimePlatform.WindowsEditor)          //如果是Windows平臺
                {
                    filePath = "file:///" + Application.streamingAssetsPath + "/" + file;
                }
                break;
            case FolderType.PersistentData:
                if (Application.platform == RuntimePlatform.Android)                    //如果是Android平臺
                {
                    filePath = "file://" + Application.persistentDataPath + "/" + file;
                }
                else if (Application.platform == RuntimePlatform.WindowsEditor)          //如果是Windows平臺
                {
                    filePath = "file:///" + Application.persistentDataPath + "/" + file;
                }
                break;
        }
        

        WWW w = new WWW(filePath);

        yield return w;


        if (w.error == null)
        {
            switch (fileType)
            {
                case FileType.AudioCilp:
                    //我使用的Unity是2017.3.0.此處 這裡只 支援 .ogg 格式的 音訊
                    Callback(w.GetAudioClip());
                    break;
                case FileType.String:
                    string data = System.Text.Encoding.UTF8.GetString(w.bytes);
                    Callback(data);
                    break;
                case FileType.Texture:
                    Callback(w.texture);
                    break;
                default:
                    break;
            }
            

            switch (m_FolderType)
            {

                case FolderType.StreamingAssets:
                    log("StreamingAssetsPath Load Success...");
                    break;
                case FolderType.PersistentData:
                    log("PersistentDataPath Load Success...");
                    break;
            }
            
        }
        else
        {

            log("Error : ======> " + w.error);

        }

    }
    

    /// <summary>
    /// 安卓端複製檔案
    /// </summary>
    /// <param name="fileName">檔案路徑</param>
    /// <returns></returns>
    IEnumerator CopyFile_Android(string fileName)
    {
        WWW w = new WWW(Application.streamingAssetsPath + "/" + fileName);

        yield return w;

        if (w.error == null)
        {
            FileInfo fi = new FileInfo(Application.persistentDataPath + "/" + fileName);

            //判斷檔案是否存在
            if (!fi.Exists)
            {
                FileStream fs = fi.OpenWrite();

                fs.Write(w.bytes, 0, w.bytes.Length);

                fs.Flush();

                fs.Close();

                fs.Dispose();

                log("CopyTxt Success!" + "\n" + "Path: ======> " + Application.persistentDataPath + fileName);

            }

        }
        else
        {
            log("Error : ======> " + w.error);
        }

    }

    /// <summary>
    /// 向我的控制檯列印內容
    /// </summary>
    /// <param name="content">內容</param>
    void log(string content)
    {
#if log
        Debug.Log(content);
#endif

    }
}