Program.cs

using Microsoft.Win32;
using PlenBotLogUploader.AppSettings;
using System;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Windows.Forms;

namespace PlenBotLogUploader
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            var currProcess = Process.GetCurrentProcess();
            var processName = Path.GetFileNameWithoutExtension(Application.ExecutablePath.AsSpan()).ToString();
            var otherProcesses = Process.GetProcessesByName(processName)
                .Where(x => !x.Id.Equals(currProcess.Id))
                .ToArray();
            var args = Environment.GetCommandLineArgs();
            var localDir = $"{Path.GetDirectoryName(Application.ExecutablePath.Replace('/', '\\'))}\\";
            if (args.Length == 4)
            {
                if (args[1].Equals("-update", StringComparison.OrdinalIgnoreCase) && args[3].Equals("-m", StringComparison.OrdinalIgnoreCase))
                {
                    if (otherProcesses.Length == 0)
                    {
                        File.Copy(Application.ExecutablePath.Replace('/', '\\'), localDir + args[2], true);
                        Process.Start(new ProcessStartInfo()
                        {
                            UseShellExecute = true,
                            FileName = localDir + args[2],
                            Arguments = "-m -finishupdate",
                        });
                        return;
                    }
                    else
                    {
                        foreach (var process in otherProcesses.AsSpan())
                        {
                            try
                            {
                                if (!process.WaitForExit(350))
                                {
                                    process.Kill();
                                }
                            }
                            catch
                            {
                                // do nothing
                            }
                        }
                        File.Copy(Application.ExecutablePath.Replace('/', '\\'), localDir + args[2], true);
                        Process.Start(new ProcessStartInfo()
                        {
                            UseShellExecute = true,
                            FileName = localDir + args[2],
                            Arguments = "-m -finishupdate",
                        });
                        return;
                    }
                }
            }
            else if (args.Length == 3)
            {
                if (args[2].Equals("-finishupdate", StringComparison.OrdinalIgnoreCase))
                {
                    File.Delete($"{localDir}PlenBotLogUploader_Update.exe");
                }
                else if (args[1].Equals("-update", StringComparison.OrdinalIgnoreCase))
                {
                    if (otherProcesses.Length == 0)
                    {
                        File.Copy(Application.ExecutablePath.Replace('/', '\\'), localDir + args[2], true);
                        Process.Start(new ProcessStartInfo()
                        {
                            UseShellExecute = true,
                            FileName = localDir + args[2],
                            Arguments = "-finishupdate",
                        });
                        return;
                    }
                    else
                    {
                        foreach (var process in otherProcesses.AsSpan())
                        {
                            try
                            {
                                if (!process.WaitForExit(350))
                                {
                                    process.Kill();
                                }
                            }
                            catch
                            {
                                // do nothing
                            }
                        }
                        File.Copy(Application.ExecutablePath.Replace('/', '\\'), localDir + args[2], true);
                        Process.Start(new ProcessStartInfo()
                        {
                            UseShellExecute = true,
                            FileName = localDir + args[2],
                            Arguments = "-finishupdate",
                        });
                        return;
                    }
                }
            }
            else if (args.Length == 2)
            {
                if (args[1].Equals("-finishupdate", StringComparison.OrdinalIgnoreCase))
                {
                    File.Delete($"{localDir}PlenBotLogUploader_Update.exe");
                }
                else if (args[1].Equals("-resetsettings", StringComparison.OrdinalIgnoreCase))
                {
                    using (var registrySubKey = Registry.CurrentUser.OpenSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Run", true))
                    {
                        if (registrySubKey.GetValue("PlenBot Log Uploader") is not null)
                        {
                            registrySubKey.DeleteValue("PlenBot Log Uploader");
                        }
                    }
                    new ApplicationSettings().Save();
                }
            }
            if (otherProcesses.Length == 0)
            {
                Application.EnableVisualStyles();
                Application.SetHighDpiMode(HighDpiMode.SystemAware);
                Application.SetCompatibleTextRenderingDefault(false);
                Application.Run(new FormMain());
            }
        }
    }
}