using System;
using System.IO;
using System.Runtime.InteropServices;
using UnityEngine;
/*******************************************************************************
*Create By CG
*Function 
*******************************************************************************/
namespace CG.UTility
{
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public class OpenDialogFile
    {
        public int structSize = 0;
        public IntPtr dlgOwner = IntPtr.Zero;
        public IntPtr instance = IntPtr.Zero;
        public String filter = null;
        public String customFilter = null;
        public int maxCustFilter = 0;
        public int filterIndex = 0;
        public String file = null;
        public int maxFile = 0;
        public String fileTitle = null;
        public int maxFileTitle = 0;
        public String initialDir = null;
        public String title = null;
        public int flags = 0;
        public short fileOffset = 0;
        public short fileExtension = 0;
        public String defExt = null;
        public IntPtr custData = IntPtr.Zero;
        public IntPtr hook = IntPtr.Zero;
        public String templateName = null;
        public IntPtr reservedPtr = IntPtr.Zero;
        public int reservedInt = 0;
        public int flagsEx = 0;
    }

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public class OpenDialogDir
    {
        public IntPtr hwndOwner = IntPtr.Zero;
        public IntPtr pidlRoot = IntPtr.Zero;
        public String pszDisplayName = null;
        public String lpszTitle = null;
        public UInt32 ulFlags = 0;
        public IntPtr lpfn = IntPtr.Zero;
        public IntPtr lParam = IntPtr.Zero;
        public int iImage = 0;
    }

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public class OpenFileName
    {
        public int structSize = 0;
        public IntPtr dlgOwner = IntPtr.Zero;
        public IntPtr instance = IntPtr.Zero;
        public String filter = null;
        public String customFilter = null;
        public int maxCustFilter = 0;
        public int filterIndex = 0;
        public String file = null;
        public int maxFile = 0;
        public String fileTitle = null;
        public int maxFileTitle = 0;
        public String initialDir = null;
        public String title = null;
        public int flags = 0;
        public short fileOffset = 0;
        public short fileExtension = 0;
        public String defExt = null;
        public IntPtr custData = IntPtr.Zero;
        public IntPtr hook = IntPtr.Zero;
        public String templateName = null;
        public IntPtr reservedPtr = IntPtr.Zero;
        public int reservedInt = 0;
        public int flagsEx = 0;
    }
    public class FolderBrowserHelper
	{
        #region Window

        [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
        private static extern bool GetOpenFileName([In, Out] OpenFileName ofn);

        [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
        private static extern bool GetSaveFileName([In, Out] OpenFileName ofn);

        [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
        private static extern bool GetOpenFileName([In, Out] OpenDialogFile ofn);

        [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
        private static extern bool GetSaveFileName([In, Out] OpenDialogFile ofn);

        [DllImport("shell32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
        private static extern IntPtr SHBrowseForFolder([In, Out] OpenDialogDir ofn);

        [DllImport("shell32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
        private static extern bool SHGetPathFromIDList([In] IntPtr pidl, [In, Out] char[] fileName);

        #endregion

        public const string IMAGEFILTER = "图片文件(*.jpg;*.png)\0*.jpg;*.png";
        public const string ALLFILTER = "所有文件(*.*)\0*.*";

        /// <summary>
        /// 选择文件
        /// </summary>
        /// <param name="callback">返回选择文件夹的路径</param>
        /// <param name="filter">文件类型筛选器</param>
        public static void SelectFile(Action<string> callback, string filter = ALLFILTER)
        {
            try
            {
                OpenFileName openFileName = new OpenFileName();
                openFileName.structSize = Marshal.SizeOf(openFileName);
                // openFileName.initialDir = "初始目录"

                openFileName.filter = filter;
                openFileName.file = new string(new char[256]);
                openFileName.maxFile = openFileName.file.Length;
                openFileName.fileTitle = new string(new char[64]);
                openFileName.maxFileTitle = openFileName.fileTitle.Length;
                openFileName.title = "选择文件";
                openFileName.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000008;
                if (GetSaveFileName(openFileName))
                {
                    string filepath = openFileName.file; //选择的文件路径;  
                    if (File.Exists(filepath))
                    {
                        if (callback != null)
                            callback(filepath);
                        return;
                    }
                }
            }
            catch (Exception e)
            {
                WDebug.LogError(e);
            }

            if (callback != null)
                callback(string.Empty);
        }

        /// <summary>
        /// 调用WindowsExploer 并返回所选文件夹路径
        /// </summary>
        /// <param name="dialogtitle">打开对话框的标题</param>
        /// <returns>所选文件夹路径</returns>
#if UNITY_EDITOR || UNITY_STANDALONE
        public
#elif UNITY_WEBGL
        private
#endif
        static string GetPathFromWindowsExplorer(string dialogtitle = "请选择下载路径")
        {
            try
            {
                OpenDialogDir ofn2 = new OpenDialogDir();
                ofn2.pszDisplayName = new string(new char[2048]);
                ; // 存放目录路径缓冲区  
                ofn2.lpszTitle = dialogtitle; // 标题  
                ofn2.ulFlags = 0x00000040; // 新的样式,带编辑框  
                IntPtr pidlPtr = SHBrowseForFolder(ofn2);

                char[] charArray = new char[2048];

                for (int i = 0; i < 2048; i++)
                {
                    charArray[i] = '\0';
                }

                SHGetPathFromIDList(pidlPtr, charArray);
                string res = new string(charArray);
                res = res.Substring(0, res.IndexOf('\0'));
                return res;
            }
            catch (Exception e)
            {
                WDebug.LogError(e);
            }

            return string.Empty;
        }

        /// <summary>
        /// 打开目录
        /// </summary>
        /// <param name="path">将要打开的文件目录</param>
#if UNITY_EDITOR || UNITY_STANDALONE
        public
#elif UNITY_WEBGL
        private
#endif
        static void OpenFolder(string path)
        {
            System.Diagnostics.Process.Start("explorer.exe", path);
        }
    }
}