using System.Text;
using System.Diagnostics;

namespace Password_Generator
{
    static class PasswordGenerator
    {
        private static string RandomStr(int length, bool no_symbols = false)
        {
            StringBuilder builder = new StringBuilder();
            Random rnd = new Random();
            for (int i = 0; i < length; i++)
            {
                if (rnd.Next(0, 101) <= 60) //60% chance for a character
                {
                    char c = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * rnd.NextDouble() + 65))); //random character
                    if (no_symbols && Char.IsSymbol(c))
                    {
                        while (Char.IsSymbol(c))
                        {
                            c = Convert.ToChar(Convert.ToInt32(Math.Floor(26 * rnd.NextDouble() + 65))); //random character
                        }
                    }
                    builder.Append(c);
                }
                else //40% change for number
                {
                    builder.Append(Convert.ToChar(rnd.Next(0, 10)));
                }
            }

            return builder.ToString();
        }

        public static string? New(string recipient, int length, bool no_symbols = false)
        {
            try
            {
                Process proc = new Process()
                {
                    StartInfo = new ProcessStartInfo
                    {
                        FileName = "cmd.exe", //TODO: pipe the return value of RandomStr to gpg with the --quiet --encrypt --recipient {recipient} flags
                        Arguments = $"echo {RandomStr(length, no_symbols)} | gpg --quiet --encrypt --recipient {recipient}",
                        UseShellExecute = false,
                        RedirectStandardOutput = true,
                        CreateNoWindow = true
                    }
                };
                proc.Start();

				StringBuilder builder = new StringBuilder();
                while (!proc.StandardOutput.EndOfStream)
                {
					builder.Append(proc.StandardOutput.ReadLine());
                }
			    return builder.ToString();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString(), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            return null;
        }
    }
}