TelegramMessageCounter/ArgumentReader.cs

using System.Reflection;

namespace TelegramMessageCounter;

public static class ArgumentReader
{
    public static DataRequest ReadArguments(string[] args)
    {
        string? login = null;
        string? username = null;
        if (args.Length > 0 && args.Any(x => x == "--help"))
        {
            var helpFile = Assembly.GetExecutingAssembly()
                .GetManifestResourceStream("TelegramMessageCounter.help.txt");
            Console.WriteLine(new StreamReader(helpFile ?? new MemoryStream()).ReadToEnd());
            Environment.Exit(0);
        }
        
        if (args.Any(x => x == "--user"))
        {
            var userNameArgIndex = args.ToList().IndexOf("--user");
            username = args[userNameArgIndex + 1];
        }

        if (args.Any(x => x == "--login" || x == "-L"))
        {
            var userNameArgIndex = args.ToList().IndexOf("--login");
            if (userNameArgIndex == -1)
            {
                userNameArgIndex = args.ToList().IndexOf("-L");
            }

            login = args[userNameArgIndex + 1];
        }

        string?[] argValues = [login, username];
        string? path = args.Length > 1 && argValues.All(x => x != args.Last()) ? args.Last() : null;

        if (path == null)
            return new(login, username);
        
        return new(login, username, path);
    }
}