aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Windows.Forms;
using System.Text.RegularExpressions;

namespace Dice_Game {
    class Program {
        public static INIT S; //intialises the INIT class and allows the use of variables within it
        static void Main(string[] args) {
            GameStart(); //starts the program
        }
        public static void GameStart() {
            S = new INIT();
            Functions L = new Functions(); //initialises the Functions class in the form of L which stores all the functions of the game which can be used in the future
            L.ImportUsers();
            Console.WriteLine("Welcome to the Dice Game! \n The rules are: \n -You write Roll to roll the dice \n -You enter your username \n -If you're playing with 2 players you take it turns rolling. \n \n Write 'Start' to Start the game \n Write 'Register' to register \n Write Leaderboard to view the leaderboard");
            //Checks for errors
                try {
                    S.Choice = Console.ReadLine();
                }
                catch(ArgumentOutOfRangeException) {
                    MessageBox.Show("Sorry, something broke. Let's try again!", "Error", //outputs error message if the program breaks
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                    GameStart();
                }
                catch(ArgumentNullException) {
                    MessageBox.Show("Sorry, something broke. Let's try again!", "Error", //outputs error message if the program breaks
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                    GameStart();
                }
                if (S.Choice == "Start" || S.Choice == "start") {
                    L.LoginPrompt();
                }
                else if (S.Choice == "Register" || S.Choice == "register") {
                    L.RegisterPrompt();
                }
                else if (S.Choice == "Leaderboard" || S.Choice == "leaderboard") {
                Leadboard G = new Leadboard();
                G.ViewLeadBoard();
                GameStart();
            }
        }
    }
    class Leadboard {
        int maxValue = 0;
        int Sum;
        public void ViewLeadBoard() {
            var myFile = File.Create(Program.S.CurrentDirectory + "Temp.txt");
            StreamReader sr = new StreamReader(Program.S.CurrentDirectory + "Leaderboard.txt");
            string contents = sr.ReadToEnd();
            myFile.Close();
            sr.Close();

            TextWriter Tw = new StreamWriter(Program.S.CurrentDirectory + "Temp.txt");
            string[] lines = contents.Split( //splits leaderboard per each line
                    new[] { Environment.NewLine },
                    StringSplitOptions.None
            );
            string[] temp = new string[2];
            string[,] Strings = new string[lines.Length, 2];
            for (int i = 0; i < lines.Length; i++) {
                temp = Regex.Split(lines[i], @"\d+"); //split at number
                temp[1] = Regex.Match(lines[i], @"\d+").Value;
                Strings[i, 0] = temp[0];
                Strings[i, 1] = temp[1];
            }

            Console.WriteLine("sick");
            while (Sum != -1) {
                Sum = 0;
                for (int i = 0; i < lines.Length; i++) {
                    Sum += Convert.ToInt32(Strings[i, 1]);
                }
                if (Sum == 0) {
                    Sum = -1;
                    break;
                }
                for (int i = 0; i < lines.Length; i++) {
                    if (Convert.ToInt32(Strings[i, 1]) > Convert.ToInt32(Strings[maxValue, 1])) {
                        maxValue = i; //Find highest number in array, then proceed to delete the 2 records from array and append them to a string on new line
                    }
                    //else if (Convert.ToInt32(Strings[i + 1, 1]) > Convert.ToInt32(Strings[i, 1])) {
                    //    maxValue = i - 1;
                    //}
                }
                Tw.Write(System.Environment.NewLine + "{0,-20} {1,20}", Strings[maxValue, 0], Strings[maxValue, 1]);
                Strings[maxValue, 1] = "0";
                Console.WriteLine(Strings[0, 1]);
                Console.WriteLine(Strings[1, 1]);
                Console.WriteLine(Strings[2, 1]);
            }
            Tw.Close();
            StreamReader sr2 = new StreamReader(Program.S.CurrentDirectory + "Temp.txt");
            contents = sr2.ReadToEnd();
            sr2.Close();
            File.Delete(Program.S.CurrentDirectory + "Temp.txt");
            Console.Clear();
            Console.WriteLine("-------------------------------------");
            Console.WriteLine("{0,-20} {1,20}", "Username", "Wins");
            Console.WriteLine(contents);
            Console.WriteLine("-------------------------------------");
            Console.WriteLine("");
            Console.WriteLine("Press any key to continue");
            Console.ReadKey();
            Console.Clear();
            }
        }

    class INIT { //creates a class which stores all the variables that might change
        public string Choice;
        public string Choice2;
        public string Username;
        public string Username2;
        public string Password;
        public string Password2;
        public string NUsername;
        public string NPassword;
        public string CurrentDirectory;
        public string[] Users;
        public StreamReader sr;
        public TextWriter tw;
        public string UserFile;
        public string[,] UserPass; //I used a 2 dimensional array because it allows to reference the correct username and password really easily and efficiently
        public bool[] LoginAccepted = new bool[2];
        public bool AI;
        public bool P2;
    }
    class Functions {
        int lineCount;
        public void LoginPrompt() { //Prompt for logging the user in
            bool Pt2 = false;
            void Login2() {
                Console.WriteLine("Please enter the login details for the second player \n ----------------------------");
                Console.WriteLine("Please Input your username");
                try {
                    Program.S.Username = Console.ReadLine(); //Reads user response and stores it as a password
                }
                catch (ArgumentOutOfRangeException) {
                    MessageBox.Show("Sorry something broke", "Error", //outputs error message if the program breaks
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                catch (ArgumentNullException) {
                    MessageBox.Show("Sorry something broke", "Error", //outputs error message if the program breaks
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                //Password Section
                //Asks user for input and catches errors if they exist
                Console.WriteLine("Please input your password");
                try {
                    Program.S.Password = Console.ReadLine(); //Reads user response and stores it as a password
                }
                catch (ArgumentOutOfRangeException) {
                    MessageBox.Show("Sorry something broke", "Error", //outputs error message if the program breaks
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                catch (ArgumentNullException) {
                    MessageBox.Show("Sorry something broke", "Error", //outputs error message if the program breaks
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                //
                //Code here for checking with the file which I will add in later on
                Pt2 = LoginChecker(Program.S.Username, Program.S.Password);
            }

            Console.WriteLine("AI or 2P (2 Player?)");
            Game B = new Game();

            try {
                Program.S.Choice2 = Console.ReadLine(); // checks if whatever the user inputs doesn't break it
            }
            catch (ArgumentOutOfRangeException) {
                MessageBox.Show("Sorry something broke", "Error", //outputs error message if the program breaks
                MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            catch (ArgumentNullException) {
                MessageBox.Show("Sorry something broke", "Error", //outputs error message if the program breaks
                MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            if (Program.S.Choice2 == "AI" || Program.S.Choice2 == "ai") {
                //Just continues the program
                Program.S.AI = true;
            }
            else if (Program.S.Choice2 == "2P" || Program.S.Choice2 == "2p") {
                Program.S.P2 = true;
                Login2();
            }
            //Username Section
            //Asks user for input and catches errors if they exist
            Console.WriteLine("Please Input your username");
                try {
                    Program.S.Username2 = Console.ReadLine(); //Reads user response and stores it as a password
                }
                catch (ArgumentOutOfRangeException) {
                    MessageBox.Show("Sorry something broke", "Error", //outputs error message if the program breaks
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                catch (ArgumentNullException) {
                    MessageBox.Show("Sorry something broke", "Error", //outputs error message if the program breaks
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            //Password Section
            //Asks user for input and catches errors if they exist within the program
                Console.WriteLine("Please input your password");
                try {
                    Program.S.Password2 = Console.ReadLine(); //Reads user response and stores it as a password
                }
                catch (ArgumentOutOfRangeException) {
                    MessageBox.Show("Sorry something broke", "Error", //outputs error message if the program breaks
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                catch (ArgumentNullException) {
                    MessageBox.Show("Sorry something broke", "Error", //outputs error message if the program breaks
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            //
            //Code here for checking with the file which I will add in later on
            if (Program.S.Username2 == Program.S.Username) {
                Console.WriteLine("Players can't both use the same account");
                Console.ReadKey();
                //Restart program function
            }
            bool Pt1 = LoginChecker(Program.S.Username2, Program.S.Password2);

            if (Pt1 == true) {
                if (Program.S.AI == true) {
                    Console.WriteLine("Login succesful");
                    Console.ReadKey();
                    B.AIGAME();
                    Environment.Exit(1);
                }
            }

            if (Pt2 == true && Pt1 == true) {
                    Console.WriteLine("both work");
                    B.P2GAME();
            }



            else if (Pt1 == false || Pt2 == false) {
                Console.WriteLine("Login Failed");
                Console.ReadKey();
            }


            //ADD LIMITED LOGIN ALLOWANCES
        }

        public void RegisterPrompt() { //Prompt for Registering the user
            //Username Section

                Console.WriteLine("Please enter your new Username");
                try {
                    Program.S.NUsername = Console.ReadLine(); //Reads user response and stores it as a password
                    if (Program.S.NUsername.Any(char.IsDigit) == true) {
                    Console.WriteLine("Sorry, the username cannot contain numbers \n Press any key to try again \n");
                    Console.ReadKey();
                    RegisterPrompt();
                    }
                }
                catch (ArgumentOutOfRangeException) {
                    MessageBox.Show("Sorry something broke", "Error", //outputs error message if the program breaks
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                catch (ArgumentNullException) {
                    MessageBox.Show("Sorry something broke", "Error", //outputs error message if the program breaks
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                if (Program.S.NUsername.Length > 16) { //if the Username the user is trying to register exceeds 16 characters in length this forces the user to restart the registering process
                    Console.WriteLine("Your username exceeded the 16 character limit, please try again \n");
                    RegisterPrompt();
                }
                else if (Program.S.NUsername.Length < 3) { //checks if the username is smaller than 3 characters in length
                    Console.WriteLine("Your username is too short, the login process will restart \n");
                    RegisterPrompt();
                }

            //This will check if the username already exists
            DoesUserExist();

            // Password Section

                Console.WriteLine("Please enter your new password to associate with that username");
                try {
                    Program.S.NPassword = Console.ReadLine(); //Reads user response and stores it as a password
                }
                catch (ArgumentOutOfRangeException) {
                    MessageBox.Show("Sorry something broke", "Error", //outputs error message if the program breaks
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                catch (ArgumentNullException) {
                    MessageBox.Show("Sorry something broke", "Error", //outputs error message if the program breaks
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                if (Program.S.NPassword.Length > 16) { //if the Password the user is trying to register exceeds 16 characters in length this forces the user to restart the registering process
                    Console.WriteLine("Your Password exceeded the 16 character limit, please try again \n");
                    RegisterPrompt();
                }
                else if (Program.S.NPassword.Length < 3) { //checks if the username is smaller than 3 characters in length
                    Console.WriteLine("Your password is too short, the login process will restart \n");
                    RegisterPrompt();
                }


            //This will add the new details to the list
            AddtoList();
            Program.GameStart();
        }
        void AddtoList() { //This method adds the details to the list of existing users
            Program.S.tw = new StreamWriter(Program.S.UserFile, true);
            Program.S.tw.Write(Environment.NewLine + Program.S.NUsername + "|" + Program.S.NPassword);
            Program.S.tw.Close();
        }
        bool LoginChecker(string Username, string Password) {
            for (int y = 0; y < lineCount ; y++) {
                if (Username == Program.S.UserPass[y, 0] && Password == Program.S.UserPass[y, 1]) {
                    return true;
                }
            }
            return false;
        }
        void DoesUserExist() { //Checks whether the user exists
            try {
                var regexItem = new Regex("^[a-zA-Z0-9 ]*$");
                Program.S.sr = new StreamReader(Program.S.UserFile);
                string contents = Program.S.sr.ReadToEnd();
                if (contents.Contains(Program.S.NUsername)) {
                    Console.WriteLine("Sorry this user already exists, please pick another username, \n \n Press any key to continue");
                    Console.ReadKey();
                    Console.Clear();
                    Program.S.sr.Close();
                    RegisterPrompt();
                }

                else if (Program.S.NUsername.Any(char.IsDigit) || regexItem.IsMatch(Program.S.NUsername)) {
                    Console.WriteLine("Sorry, the username cannot contain digits or special characters, \n \n Press any key to continue");
                    Console.ReadKey();
                    Console.Clear();
                    RegisterPrompt();
                }
                Program.S.sr.Close();
            }
            catch(ArgumentNullException) {
                //If no users exist stops the program from crashing
            }
            Console.WriteLine("Check passed... The user does not exist, press any key to continue");
            Console.ReadLine();
        }
        void SplitPass() { //splits the username and passwords into program friendly and readable format for validation
            string[] temp = new string[2];
            Program.S.UserPass = new string[lineCount, 2];
            for (int i = 0; i < lineCount; i++) {
                temp = Program.S.Users[i].Split('|');
                Program.S.UserPass[i, 0] = temp[0];
                Program.S.UserPass[i, 1] = temp[1];
            }
        }
        public void ImportUsers() { //imports the Username/Password file
            Program.S.CurrentDirectory = Directory.GetCurrentDirectory() +"\\"; //Saves the current working directory
            Program.S.UserFile = Program.S.CurrentDirectory + "Users.txt";
            //when the users files exists
            if (File.Exists(Program.S.UserFile) == true) {
                //Counts the lines (Each Line is a user)
                try {
                    lineCount = File.ReadLines(Program.S.UserFile).Count();
                    Program.S.Users = File.ReadAllLines(Program.S.UserFile); //Adds all of the users to the array
                    Program.S.sr.Close();
                }
                catch(NullReferenceException) {
                    //ignores it and doesn't create an array
                }
            }
            //when the users file doesn't exist
            else if (File.Exists(Program.S.UserFile) == false) {
                File.Create(Program.S.UserFile);
            }
            try {
                SplitPass();
            }
            catch (ArgumentNullException) {
                //If no users exists
            }
            catch (NullReferenceException) {
                //If no users exists
            }
        }
    }
    class Game {
        Player p1; //initialises the players
        Player p2;
        int Counter = 0; //resets and initialises the counter
        public void AIGAME() {
            p1 = new Player() {
                Name = Program.S.Username2, //sets player 1's name to player 1 input
                Score = 0,
                OldScore = 0
            };
            p2 = new Player() {
                Name = "AI", //sets player 2's name to be that of the ai
                Score = 0,
                OldScore = 0
            };
            do {
                Progresz(false);
            } while (Counter < 4);
            while (p1.Score == p2.Score) {
                Progresz(true);
            }
            switch (p1.Score > p2.Score) {
                case true:
                    Console.WriteLine(p1.Name + " Has Won!");
                    Console.ReadKey();
                    WriteWins(p1.Name);
                    break;
                case false:
                    Console.WriteLine(p2.Name + " Has Won!");
                    Console.ReadKey();
                    break;
            }
    }
            void Progresz(bool Option) {
                if (Option == false) {
                    p1.Score += Roll(false);
                    if (p1.Score > p1.OldScore) { //Checks if the player rolled an even or odd then displays it as output
                        Console.WriteLine(p1.Name + " rolled an even, +10 points to " + p1.Name + ", \n " + p1.Name + "'s current score is: " + p1.Score, "\n \n Press any key to continue");
                        Console.ReadKey();
                        Console.Clear();
                    }
                    else if (p1.Score < p1.OldScore) { //checks if the player score is less than 0
                        if (p1.Score < 0) {
                            p1.Score = 0;
                        }
                        Console.WriteLine(p1.Name + " rolled an odd, -5 points to " + p1.Name + ", \n " + p1.Name + "'s current score is: " + p1.Score, "\n \n Press any key to continue");
                        Console.ReadKey();
                        Console.Clear();
                    }
                    p1.OldScore = p1.Score;

                    p2.Score += Roll(false);
                    if (p2.Score > p2.OldScore) {
                        Console.WriteLine(p2.Name + " rolled an even, +10 points to " + p2.Name + ", \n" + p2.Name + "'s current score is: " + p2.Score, "\n \n Press any key to continue");
                        Console.ReadKey();
                        Console.Clear();
                    }
                    else if (p2.Score < p2.OldScore) {
                        if (p2.Score < 0) {
                            p2.Score = 0;
                        }
                        Console.WriteLine(p2.Name + " rolled an odd, -5 points to " + p2.Name + ", \n" + p2.Name + "'s current score is: " + p2.Score, "\n \n Press any key to continue");
                        Console.ReadKey();
                        Console.Clear();
                    }
                    p2.OldScore = p2.Score;
                    Counter++;
                }
                else if (Option == true) {
                    p1.Score += Roll(true);
                    if (p1.Score > p1.OldScore) {
                        Console.WriteLine(p1.Name + " rolled an even, +10 points to " + p1.Name + ", \n " + p1.Name + "'s current score is: " + p1.Score, "\n \n Press any key to continue");
                        Console.ReadKey();
                        Console.Clear();
                    }
                    else if (p1.Score < p1.OldScore) {
                        if (p1.Score < 0) {
                            p1.Score = 0;
                        }
                        Console.WriteLine(p1.Name + " rolled an odd, -5 points to " + p1.Name + ", \n " + p1.Name + "'s current score is: " + p1.Score, "\n \n Press any key to continue");
                        Console.ReadKey();
                        Console.Clear();
                    }
                    p1.OldScore = p1.Score;

                    p2.Score += Roll(true);
                    if (p2.Score > p2.OldScore) {
                        Console.WriteLine(p2.Name + " rolled an even, +10 points to " + p2.Name + ", \n" + p2.Name + "'s current score is: " + p2.Score, "\n \n Press any key to continue");
                        Console.ReadKey();
                        Console.Clear();
                    }
                    else if (p2.Score < p2.OldScore) {
                        if (p2.Score < 0) {
                            p2.Score = 0;
                        }
                        Console.WriteLine(p2.Name + " rolled an odd, -5 points to " + p2.Name + ", \n" + p2.Name + "'s current score is: " + p2.Score, "\n \n Press any key to continue");
                        Console.ReadKey();
                        Console.Clear();
                    }
                    p2.OldScore = p2.Score;
                }
            }

            int Roll(bool Option) {

                Random Big = new Random(); //instantiates the random class
                if (Option == false) { //runs only if the loop has been run less than 4 times. i.e does this for the main part of the program
                    int d = 0;
                    int a = Big.Next(1, 6); int b = Big.Next(1, 6); //randomises the values of a and b
                    if (a == b) { //if dice scores are equal, roll once more again
                        int c = Big.Next(1, 6);
                        d = a + b + c;
                    }
                    else if (a != b) { //If Die scores are not equal, add the scores together
                        d = a + b;
                    }
                    switch (d % 2) { //checks whether the result of the die scores is even
                        case 0: //if it is, return 10
                            return 10;
                        case 1: //if it is not even, return -5
                            return -5;
                    }
                }
                else if (Option == true) { //if the code has been run more than 4 times and the scores of both players are equal, only one die will roll
                    int a = Big.Next(1, 6);
                    switch (a % 2) {
                        case 0:
                            return 10;
                        case 1:
                            return -5;
                    }
                }
                return -5;
            }
            public void P2GAME() { //When the 2 player mode is selected
                p1 = new Player() { //defines a player
                    Name = Program.S.Username2, //stores the player's name as the players username
                    Score = 0, //sets player's score to 0
                    OldScore = 0 //sets the old score to 0
                };
                p2 = new Player() {
                    Name = Program.S.Username,
                    Score = 0,
                    OldScore = 0
                };
                do { //do while loop, whilst the counter is smaller than 4, continue the dice game
                    Progresz(false);
                } while (Counter < 4);
                while (p1.Score == p2.Score) {
                    Progresz(true);
                }
                switch (p1.Score > p2.Score) {
                    case true:
                        Console.WriteLine(p1.Name + " Has Won!");
                        Console.ReadKey();
                        WriteWins(p1.Name);
                        break;
                    case false:
                        Console.WriteLine(p2.Name + " Has Won!");
                        Console.ReadKey();
                        WriteWins(p2.Name);
                        break;
                }
            }
        void WriteWins(string Winner) {
            //Reads the contents of leaderboard.txt and if it doesn't exists it creates a new file called leaderboard.txt and writes the winner into it
            if (File.Exists(Program.S.CurrentDirectory + "Leaderboard.txt") == true) {
                StreamReader sr = new StreamReader(Program.S.CurrentDirectory + "Leaderboard.txt");
                string contents = sr.ReadToEnd();
                sr.Close();
                File.WriteAllText(Program.S.CurrentDirectory + "Leaderboard.txt", string.Empty);
                TextWriter Tw = new StreamWriter(Program.S.CurrentDirectory + "Leaderboard.txt", true);
                if (contents.Contains(Winner)) {
                    string[] temp = new string[2];
                    string[] lines = contents.Split( //splits leaderboard per each line
                    new[] { Environment.NewLine },
                    StringSplitOptions.None
                    );
                    int resultString = 0;
                    for (int i = 0; i < lines.Length; i++) {
                        temp = Regex.Split(lines[i], @"\d+"); //@"(?<=\p{L})(?=\p{N})"
                        bool match = Regex.IsMatch(temp[0], string.Format(@"\b{0}\b", Regex.Escape(Winner)));
                        if (match == true) {
                            resultString = Convert.ToInt32(Regex.Match(lines[i], @"\d+").Value);
                            resultString++;
                            lines[i] = Regex.Replace(lines[i], @"\d+", Convert.ToString(resultString));
                            Tw.Write(lines[0]);
                            for (int y = 1; y < lines.Length; y++) {

                                Tw.Write(System.Environment.NewLine + lines[y]);
                            }
                            Tw.Close();
                            break;
                        }

                    }

                }
                else if (File.Exists(Program.S.CurrentDirectory + "Leaderboard.txt") == false) {
                    File.Create(Program.S.CurrentDirectory + "Leaderboard.txt");
                    Tw.WriteLine(Winner + "1");
                    Tw.Close();
                }

                else if (contents.Contains(Winner) == false) {
                    Tw.WriteLine(Winner + "1");
                    Tw.Close();
                }
        }

            }
        }
         public class Player {
            public string Name;
            public int Score;
            public int OldScore;
        }
}