// See https://aka.ms/new-console-template for more information
using System.Collections;
using System.Collections.Generic;
using System.IO.Compression;
using System.Text.RegularExpressions;
using System.Xml;



internal class Program
{
    static string[] ExtensionList = {
        // WORD
        "docm",
        "docx",
        "dotm",
        "dotx",
        // EXCEL
        "xlsm",
        "xltx",
        "xltm",
        "xlsx",
        // POWERPOINT
        "potm",
        "potx",
        "pptm",
        "pptx"
    };
    private static void Main(string[] args)
    {
        //args = [".\\bin\\Debug\\net8.0\\Testx.docx"];
        //args.Append(".\\bin\\Debug\\net8.0\\Testx.docx");
        foreach (String a in args)
        {
            Console.WriteLine(a);
            switch (a)
            {
                case "--help":

                    break;
                default:
                    bool extFound = false;
                    foreach (String ext in ExtensionList)
                    {
                        if (a.Contains("." + ext))
                        {
                            extFound = true;
                            break;
                        }
                    }
                    if (extFound)
                    {
                        removePW(a);
                    }
                    break;
            }
            //Console.WriteLine(a);
        }
        Console.ReadLine();

    }
    private static void removePW(string FilePath)
    {
        string Path = AppContext.BaseDirectory;
        Console.WriteLine(Path);

        Directory.CreateDirectory(Path + "\\temp");

        string openPath = FilePath;
        string extractPath = Path + "\\temp\\tmp_file.xml";

        string filepath_woe = FilePath.Substring(0, FilePath.Length - 5);
        string filepath_ext = FilePath.Substring(FilePath.Length - 5);
        string TMP_FILE = filepath_woe + "_noProtection" + filepath_ext;

        string SettingsFileName = "";

        using (FileStream zipToOpen = new FileStream(openPath, FileMode.Open))
        {
            using (ZipArchive archive = new ZipArchive(zipToOpen, ZipArchiveMode.Read, false))
            {
                foreach (ZipArchiveEntry entry in archive.Entries.Where(e => e.FullName.Contains("settings.xml")))
                {

                    if (File.Exists(extractPath))
                    {
                        File.Delete(extractPath);
                    }
                    SettingsFileName = entry.FullName;
                    entry.ExtractToFile(extractPath);

                }
            }
        }

        string text = File.ReadAllText(extractPath);

        string pattern = @"<w:documentProtection ([A-z0-9 ="":+\/]*)>";
        string substitution = @"";
        RegexOptions options = RegexOptions.Multiline;

        Regex regex = new Regex(pattern, options);
        string result = regex.Replace(text, substitution);

        File.WriteAllText(Path + "\\temp\\settings.xml", result);

        File.Copy(openPath, TMP_FILE);
        using (FileStream zipToOpen = new FileStream(TMP_FILE, FileMode.Open))
        {
            using (ZipArchive archive = new ZipArchive(zipToOpen, ZipArchiveMode.Update, false))
            {
                ZipArchiveEntry tmp = null;
                foreach (ZipArchiveEntry entry in archive.Entries.Where(e => e.FullName.Contains("settings.xml")))
                {
                    tmp = entry;
                }
                tmp.Delete();
                //ZipArchiveEntry readmeEntry = archive.CreateEntry("word/settings.xml", CompressionLevel.Fastest);
                ZipArchiveEntry readmeEntry = archive.CreateEntry(SettingsFileName, CompressionLevel.Fastest);
                using (StreamWriter writer = new StreamWriter(readmeEntry.Open()))
                {
                    writer.Write(result);
                }
            }
        }
        File.Delete(extractPath);
        File.Delete(Path + "\\temp\\settings.xml");
        Console.WriteLine("Doc unprotected | Dateibearbeitungspasswortschutz entfernt");
        Console.WriteLine("New File | Neue Datei: "+TMP_FILE);
        Console.WriteLine("press Enter to close | Eingabetaste drücken zum Schließen");
    }
}