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

public static class FileUtil
{   // My Super Fucking File Manager
    public static string OpenFile()
    {
        FileOpenDialog dialog = new FileOpenDialog();
        dialog.structSize = Marshal.SizeOf(dialog);
        dialog.filter = "All Files\0*\0\0";
        dialog.file = new string(new char[256]);
        dialog.maxFile = dialog.file.Length;
        dialog.fileTitle = new string(new char[64]);
        dialog.maxFileTitle = dialog.fileTitle.Length;
        dialog.initialDir = UnityEngine.Application.dataPath;
        dialog.title = "Open Card Asset Bundle";
        dialog.defExt = "";
        dialog.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000008;
        //OFN_EXPLORER|OFN_FILEMUSTEXIST|OFN_PATHMUSTEXIST|OFN_NOCHANGEDIR
        if (DialogShow.GetOpenFileName(dialog))
        {
            Debug.Log(dialog.file);
            return dialog.file;
        }
        return "";
    }

    public static void WatchFile(string dirPath, string filename, FileSystemEventHandler handler)
    {
        var watcher = new FileSystemWatcher(dirPath);
        watcher.NotifyFilter = NotifyFilters.LastWrite;
        watcher.Changed += handler;
        watcher.Filter = filename;
        watcher.EnableRaisingEvents = true;
    }
}

    
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class FileOpenDialog
{
    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 DialogShow
{
    [DllImport("Comdlg32.dll", SetLastError = true, ThrowOnUnmappableChar = true, CharSet = CharSet.Auto)]
    public static extern bool GetOpenFileName([In, Out] FileOpenDialog dialog);
}