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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace Tango.FSE.Common.Helpers
{
    public static class StartupArgsHelper
    {
        public static String[] CleanArgsFromWeb(String[] args)
        {
            if (args != null && args.Length == 1) //Check for web custom protocol
            {
                var match = Regex.Match(args[0], "%5C%5C(.+)");
                var groups = match.Groups.OfType<Group>().ToList();
                if (groups.Count == 2)
                {
                    List<String> cleanArgs = new List<string>();

                    String encodedData = groups[1].Value;
                    String decodedData = DecodeBase64String(encodedData);
                    String[] splitted = decodedData.Split(' ');

                    foreach (var item in splitted)
                    {
                        cleanArgs.Add(item);
                    }

                    return cleanArgs.ToArray();
                }
            }

            return args;
        }

        public static String EncodeBase64String(String text)
        {
            var plainTextBytes = Encoding.UTF8.GetBytes(text);
            return Convert.ToBase64String(plainTextBytes).Replace("=", "-");
        }

        public static String DecodeBase64String(String base64)
        {
            var base64EncodedBytes = Convert.FromBase64String(base64.Replace("-", "="));
            return Encoding.UTF8.GetString(base64EncodedBytes);
        }
    }
}