using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using UnityEngine;

namespace TFramework
{
    public class SystemFileTools
    {
        #region OpenFile数据接收类
        [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;
        }
        #endregion
        public static 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>
            /// 选择文件返回文件路径
            /// </summary>
            /// <param name="filter">文件类型筛选器</param>
            public static string SelectFile(string filter = ALLFILTER)
            {
                try
                {
                    OpenFileName openFileName = new OpenFileName();
                    openFileName.structSize = Marshal.SizeOf(openFileName);
                    openFileName.initialDir = Application.streamingAssetsPath.Replace('/', '\\');

                    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))
                        {
                            return filepath;
                        }
                    }
                }
                catch (Exception e)
                {
                    Debug.LogError(e);
                }
                return "";
            }

            /// <summary>
            /// 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>
            public static string GetPathFromWindowsExplorer(string dialogtitle = "请选择文件路径")
            {
                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; 
                    ofn2.ulFlags = 0x00080000; // 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)
                {
                    Debug.LogError(e);
                }

                return string.Empty;
            }

            public static void CopyDirectory(string srcPath, string destPath)
            {
                try
                {
                    DirectoryInfo dir = new DirectoryInfo(srcPath);
                    FileSystemInfo[] fileinfo = dir.GetFileSystemInfos();  //获取目录下（不包含子目录）的文件和子目录
                    foreach (FileSystemInfo i in fileinfo)
                    {
                        if (i is DirectoryInfo)     //判断是否文件夹
                        {
                            if (!Directory.Exists(destPath + "\\" + i.Name))
                            {
                                Directory.CreateDirectory(destPath + "\\" + i.Name);   //目标目录下不存在此文件夹即创建子文件夹
                            }
                            CopyDirectory(i.FullName, destPath + "\\" + i.Name);    //递归调用复制子文件夹
                        }
                        else
                        {
                            File.Copy(i.FullName, destPath + "\\" + i.Name, true);      //不是文件夹即复制文件，true表示可以覆盖同名文件
                        }
                    }
                }
                catch (Exception e)
                {
                    throw;
                }
            }

        }
    }
}