using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;

namespace B_2009
{
    class B_2009_OS
    {
        static void Crash(int param, char ch, string astr)
        {
            for (; ; )
            {
                param++;
                Console.WriteLine(param + "Error: Invalid code on error: Error: Error: Unable to generate error: Error: Error on: ");
            }
            //Param has been increased by 1
            ch++;
            //ch++
            astr = "String has been reset";
        }
        static void PrintHead(string bstr)
        {
            Console.WriteLine(@"                     ______           _____        __ _   ");
            Console.WriteLine(@"                     | ___ \         /  ___|      / _| |  ");
            Console.WriteLine(@"                     | |_/ / ___  ___\ `--.  ___ | |_| |_ ");
            Console.WriteLine(@"                     | ___ \/ _ \/ _ \`--. \/ _ \|  _| __|");
            Console.WriteLine(@"                     | |_/ /  __/  __/\__/ / (_) | | | |_ ");
            Console.WriteLine(@"                     \____/ \___|\___\____/ \___/|_|  \__|");
            Console.WriteLine("                                  B 2009 EXP");
            Console.WriteLine("                                Operating System\n\n");
        }
        static void Main(string[] args)
        {
            bool admin;
            bool access;
            //BEGIN GENERAL CODE TO INITIALIZE--------------------------------------------------------------
            Console.WriteLine(@"                     ______           _____        __ _   ");
            Console.WriteLine(@"                     | ___ \         /  ___|      / _| |  ");
            Console.WriteLine(@"                     | |_/ / ___  ___\ `--.  ___ | |_| |_ ");
            Console.WriteLine(@"                     | ___ \/ _ \/ _ \`--. \/ _ \|  _| __|");
            Console.WriteLine(@"                     | |_/ /  __/  __/\__/ / (_) | | | |_ ");
            Console.WriteLine(@"                     \____/ \___|\___\____/ \___/|_|  \__|");
            Console.WriteLine("                                  B 2009 EXP");
            Console.WriteLine("                                Operating System\n\n\n\n\n");
            Console.WriteLine("                               Welcome to B 2009\n\n");
            Console.WriteLine("(C) Copyright 2009 BeeSoft Corporation, Bertrand Stone");
            Console.WriteLine("Thanks to Nightgunner5 for the password entry system and the logo");
        login:
            Console.WriteLine("Login\n---------------");
            Console.Write("Enter username: ");
            string username;
            username = Console.ReadLine();
            Console.Write("Enter password: ");
            string password;
            password = "";
            while (username != "guest")
            {
                ConsoleKeyInfo passchar = Console.ReadKey(true);
                if (passchar.Key == ConsoleKey.Backspace)
                {
                    if (password.Length > 0)
                        Console.CursorLeft--;
                    password = password.Remove(password.Length - 1, 1);
                }
                else if (passchar.Key == ConsoleKey.Enter)
                {
                    break;
                }
                else
                {
                    password += passchar.KeyChar.ToString();
                    Console.CursorLeft++;
                }
            }
            MD5 hasher = MD5.Create();
            byte[] passwordbytes = Encoding.UTF8.GetBytes(password);
            string passhash = Convert.ToBase64String(hasher.ComputeHash(passwordbytes));
            // At this point, we could take the information above and check to make sure it's the same as the info we have stored.
            Console.WriteLine("\n");
            Console.WriteLine("B 2009 Operating System\n\n");
            if (username == "guest")
            {
                Console.WriteLine("Welcome, guest user!");
                admin = false;
            }
            else if (username == "administrator" && password == "adpass")
            {
                Console.WriteLine("Welcome, " + username + '!' + '\n');
                admin = true;
            }
            else if (username == "bertrand" && password == "7333240421")
            {
                Console.WriteLine("Welcome, " + username + '!' + '\n');
                admin = true;
            }
            else if (username == "Nightgunner5" && passhash == "Pk3OGQyFcrZMG4kYvBCm6A==")
            {
                Console.WriteLine("Welcome, " + username + '!' + '\n');
                admin = true;
            }
            else if (username == "heather" && password == "happyduckhead_idk")
            {
                Console.WriteLine("Welcome, " + username + '!' + '\n');
                admin = true;
            }
            else if (username == "ssaamm" && password == "FREDWARDBEEFBURGER")
            {
                Console.WriteLine("Welcome, " + username + '!' + '\n');
                admin = true;
            }
            else
            {
                Console.WriteLine("ACCESS DENIED");
                goto login;
            }
            //Sequence 1: Desktop access(General Cp)
            string s;
        desktop:
            Console.WriteLine("Sequence 1");
            Console.WriteLine("Access desktop");
            Console.Write("Cp>>");
            s = Console.ReadLine();
            //desktop access Cp>>

            if (s == "desktop>>||")
            {
                Console.Clear();
                Console.WriteLine("DESKTOP\n----------------------------------------\n\n\n\n\n");
                //Sequence 2: program access( Cp )
                Console.WriteLine("Sequence 2: Input command KeyCode");
                Console.Write("Cp>>");
                s = Console.ReadLine();
                goto squeak2start;
            }
            //if not goto desktop and try for valid KeyCode
            else
            {
                Console.WriteLine("\a\n\nPlease enter a valid keycode.\n");
                goto desktop;
            }
        //Check for application keycodes
        squeak2start:
            //check for PRCP
            if (s == "PRCP>>||")
            {
                Console.Clear();
                Console.WriteLine("\nWelcome to PRCP\n");
                goto PRCP;
            }
            else
            {
                Console.Clear();
                Console.WriteLine("Processing...\a\a\a");
                Console.WriteLine("Processor error: no such command.\n");
                Console.WriteLine("\n\n\nDESKTOP\n----------------------------------------\n");
                Console.Write("Cp>>");
                s = Console.ReadLine();
                goto squeak2start;
            }
        //END GENERAL CODE-----------------------------------------------------------------------

        //BEGIN PRCP-----------------------------------------------------------------------------
        PRCP:
            //CodeCommands ( Pr )
            if (admin == true)
            {
                access = true;
            }
            else
            {
                access = false;
            }
            if (access == false)
            {
                Console.WriteLine("AdministratorStat = FALSE; ACCESS TO PRCP DENIED");
                goto End;
            }
            Console.Clear();
            Console.WriteLine("Select: Cp, Pr or CFLOW (CFLOW is the default)");
            string cpprcflow;
            cpprcflow = Console.ReadLine();
            if (cpprcflow == "pr")
            {
            PR:
                Console.Clear();
                B_2009_OS.PrintHead("BeeSoft");
                Console.Write("Pr>>");
                string prs;
                prs = Console.ReadLine();
                switch (prs)
                {
                    case "exit*":
                        goto End;
                    case "desktop*":
                        goto desktop;
                    case "crash*":
                        goto crash;
                    case "info*":
                        goto info;
                    case "dir*":
                        goto List;
                    //++ cases@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
                    default:
                        Console.WriteLine("Error: Invalid command\a");
                        goto PR;
                }
            }
            else if (cpprcflow == "cp")
            {
            CP:
                Console.Clear();
                B_2009_OS.PrintHead("BeeSoft");
                Console.Write("Cp>>");
                string cps;
                cps = Console.ReadLine();
                switch (cps)
                {
                    case "exit>>||":
                        goto End;
                    case "desktop>>||":
                        goto desktop;
                    case "crash>>||":
                        goto crash;
                    case "info>>||":
                        goto info;
                    case "dir>>||":
                        goto List;
                    //++ cases@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
                    default:
                        Console.WriteLine("Error: Invalid command\a");
                        goto CP;
                }
            }
            else
            {
            CF:
                Console.Clear();
                B_2009_OS.PrintHead("BeeSoft");
                Console.Write("C>>");
                string cfs;
                cfs = Console.ReadLine();
                switch (cfs)
                {
                    case "exit|":
                        goto End;
                    case "desktop|":
                        goto desktop;
                    case "crash|":
                        goto crash;
                    case "info|":
                        goto info;
                    case "system|":
                        goto CFIFS;
                    case "dir|":
                        goto List;
                    //++ cases@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
                    default:
                        Console.WriteLine("Error: Invalid command\a");
                        goto CF;
                }
            CFIFS:
                Console.Clear();
                B_2009_OS.PrintHead("BeeSoft");
                Console.Write("C>>System>>Control>>");
                string csc;
                csc = Console.ReadLine();
                if (csc == "beep|")
                {
                    Console.WriteLine("\a");
                    goto CFIFS;
                }
                else if (csc == "exit|")
                {
                    goto End;
                }
                else if (csc == "cflow")
                {
                    goto CF;
                }
                //else if...@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
                else
                {
                    Console.WriteLine("Error: Invalid SYSTEM.CONTROL command\a");
                    Console.Clear();
                    goto CFIFS;
                }
            }
        //END PRCP-----------------------------------------------------------------------------
        crash:
            for (; ; )
            {
                B_2009_OS.Crash(3, 'a', "STR");
            }
        info:
            Console.WriteLine("PRCP is designed as an adaptable prompt form console system programming language, PRogramming Command Prompt NETWork. B 2009 also includes an even more advanced system flow, CFLOW. CFLOW is, without doubt, the absolute best system in PRCP-CF. Pr is good for beginners, Cp for most uses, but CFLOW is best for system access.");
            Console.ReadLine();
            goto PRCP;
            List:
            System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(@"C:\");

            foreach (System.IO.FileInfo file in dir.GetFiles("*.*"))
            {
                Console.WriteLine("{0}, {1}", file.Name, file.Length);
            }
            Console.ReadLine();
            goto PRCP;
        End:
            {

            }
        }
    }
}