using System;
using System.Security.Cryptography;
using System.Text;

while (true)
{
    Console.WriteLine("Select a server type:");
    Console.WriteLine("1. PostgreSQL (psql)");
    Console.WriteLine("2. Redis (redis)");
    Console.WriteLine("3. RabbitMQ (rabbitmq)");
    Console.WriteLine("4. Sandbox Web Server (sandbox)");
    Console.WriteLine("5. Staging Web Server (staging)");
    Console.WriteLine("q. Exit");
    Console.WriteLine();
    
    Console.Write(
        "Enter a number (1-5) to select a server type, or 'q' to quit: "
    );
    string choice = Console.ReadLine();

    if (choice?.ToLower() == "q")
    {
        break;
    }

    string prefix = choice switch
    {
        "1" => "psql",
        "2" => "redis",
        "3" => "rabbitmq",
        "4" => "sandbox",
        "5" => "staging",
        _ => null
    };

    if (prefix == null)
    {
        Console.ForegroundColor = ConsoleColor.Red;
        Console.Write("Invalid choice. Please try again: ");
        Console.ResetColor();
        Console.WriteLine();
        continue;
    }

    string randomUrl = GenerateRandomUrl(prefix);
    Console.ForegroundColor = ConsoleColor.Green;
    Console.WriteLine($"Generated URL: {randomUrl}");
    Console.ResetColor();
    Console.WriteLine();
    
    Console.WriteLine("Generate another URL? (y/n)");
    string another = Console.ReadLine();
    if (another?.ToLower() != "y")
    {
        break;
    }

    Console.WriteLine();
}

static string GenerateRandomUrl(string prefix, int length = 12)
{
    const string alphabet = "abcdefghijklmnopqrstuvqxyz123456789";
    
    var resultBuilder = new StringBuilder(length);
    
    byte[] randomBytes = new byte[length];
    RandomNumberGenerator.Fill(randomBytes);

    foreach (byte b in randomBytes)
    {
        resultBuilder.Append(alphabet[b % alphabet.Length]);
    }
    
    string randomString = resultBuilder.ToString();
    return $"{prefix}-{randomString}.rideaware.org";
}