using System;

using System.Threading;

public class Program

{   

    static int firstPlayerPadSize = 4;

    static int secondPlayerPadSize = 4;

    static int ballPositionX = 5;

    static int ballPositionY = 5;

    static bool ballDirectionUp = true; // Determines if the ball direction is up

    static bool ballDirectionRight = false;

    static int firstPlayerPosition = 0;

    static int secondPlayerPosition = 0;

    static int firstPlayerResult = 0;

    static int secondPlayerResult = 0;

    static Random rand = new Random();

    static void removeScrollBars()

    {

        // premahva skrolbara na konzolata

        Console.ForegroundColor = ConsoleColor.Yellow;

        Console.BufferHeight = Console.WindowHeight;

        Console.BufferWidth = Console.WindowWidth;

    }

    static void drawFirstPlayer()

    {

        for (int y = firstPlayerPosition; y < firstPlayerPosition + firstPlayerPadSize; y++)

        {

            PrintAtPosition(0, y, '|');

            PrintAtPosition(1, y, '|');

        }

    }

    static void PrintAtPosition(int x, int y, char symbol)

    {

        Console.SetCursorPosition(x, y);

        Console.Write(symbol);

    }

    static void drawSecondPlayer()

    {

        for (int y = secondPlayerPosition; y < secondPlayerPosition + secondPlayerPadSize; y++)

        {

            PrintAtPosition(Console.WindowWidth - 1, y, '|');

            PrintAtPosition(Console.WindowWidth - 2, y, '|');

        }

    }

    static void SetInitialPositions()

    {

        firstPlayerPosition = Console.WindowHeight / 2 - firstPlayerPadSize / 2;

        secondPlayerPosition = Console.WindowHeight / 2 - secondPlayerPadSize / 2;

        SetBallAtTheMiddleOfTheGameField();

    }

    static void SetBallAtTheMiddleOfTheGameField()

    {

        ballPositionX = Console.WindowWidth / 2;

        ballPositionY = Console.WindowHeight / 2;

    }

    static void DrawBall()

    {

        PrintAtPosition(ballPositionX, ballPositionY,'@');

    }

    static void PrintResult()

    {

        Console.SetCursorPosition(Console.WindowWidth / 2 - 1, 0); 

        Console.WriteLine("{0}-{1}", firstPlayerResult, secondPlayerResult);

    }

    static void MoveFirstPlayerUp()

    {

        if (firstPlayerPosition > 0)

        {

            firstPlayerPosition--;

        }

    }

    static void MoveFirstPlayerDown()

    {

        if (firstPlayerPosition < Console.WindowHeight - firstPlayerPadSize)

        {

            firstPlayerPosition++;

        }

    }

    static void MoveSecondPlayerUp()

    {

        if (secondPlayerPosition > 0)

        {

            secondPlayerPosition--;

        }

    }

    static void MoveSecondPlayerDown()

    {

        if (secondPlayerPosition < Console.WindowHeight - secondPlayerPadSize)

        {

            secondPlayerPosition++;

        }

    }

    static void SecondPlayerAIMove()

    {

        /* I variant - napylno sluchaino mestene

        int randomNumber = randomGenerator.Next(0,2);

        if (randomNumber == 0)

        {

            MoveSecondPlayerUp();

        }

        if (randomNumber == 1)

        {

            MoveSecondPlayerDown(); 

        }

        */

        /* II variant - vinagi komputyra bie

        if (ballDirectionUp == true)

        {

            MoveSecondPlayerUp();   

        }

        else

        {

            MoveSecondPlayerDown(); 

        }

        */

        // Sluchaino mestene v 50% ot sluchaite, mestene spored topcheto v drugite 50%

        /*

        int randomNumber = randomGenerator.Next(0,2);

        if (randomNumber == 0)

        {

            if (ballDirectionUp == true)

            {

                MoveSecondPlayerUp();   

            }

            else

            {

                MoveSecondPlayerDown(); 

            }

        }

        */

        // Opredelqme si procent v koito komputyra da bie

        int randomNumber = randomGenerator.Next(1,101);

        if (randomNumber < 70)

        {

            if (ballDirectionUp == true)

            {

                MoveSecondPlayerUp();   

            }

            else

            {

                MoveSecondPlayerDown(); 

            }

        }

    }

    static void MoveBall()

    {

        if (ballPositionY == 0)

        {

            ballDirectionUp = false;    

        }

        if (ballPositionY == Console.WindowHeight - 1)

        {

            ballDirectionUp = true; 

        }

        if (ballPositionX == Console.WindowWidth - 1)

        {

            SetBallAtTheMiddleOfTheGameField();

            ballDirectionRight = false;

            ballDirectionUp = true;

            firstPlayerResult++;

            Console.ReadKey();

            Console.SetCursorPosition(Console.WindowWidth / 2, Console.WindowHeight / 2);

            Console.WriteLine("First player wins!");

        }

        if (ballPositionX == 0)

        {

            SetBallAtTheMiddleOfTheGameField();

            ballDirectionRight = true;

            ballDirectionUp = true;

            secondPlayerResult++;

            Console.ReadKey();

            Console.SetCursorPosition(Console.WindowWidth / 2, Console.WindowHeight / 2);

            Console.WriteLine("Second player wins!");

        }

        if (ballPositionX < 3)

        {

            if (ballPositionY >= firstPlayerPosition && ballPositionY < firstPlayerPosition + firstPlayerPadSize)

            {

                ballDirectionRight = true;

            }

        }

        if (ballPositionX >= Console.WindowWidth - 3 - 1)

        {

            if (ballPositionY >= secondPlayerPosition && ballPositionY < secondPlayerPosition + secondPlayerPadSize)

            {

                ballDirectionRight = false;

            }   

        }

        if (ballDirectionUp)

        {

            ballPositionY--;

        }

        else

        {

            ballPositionY++;    

        }

        if (ballDirectionRight)

        {

            ballPositionX++;    

        }

        else

        {

            ballPositionX--;    

        }

    }

    public static void Main()

    {

        removeScrollBars();

        SetInitialPositions();

        while (true)

        {

            if (Console.KeyAvailable) 

            {

                ConsoleKeyInfo keyInfo = Console.ReadKey();

                if (keyInfo.Key == ConsoleKey.UpArrow) 

                {

                    MoveFirstPlayerUp();    

                }

                if (keyInfo.Key == ConsoleKey.DownArrow)

                {

                    MoveFirstPlayerDown();  

                }

            }

            SecondPlayerAIMove();

            MoveBall();

            Console.Clear();

            drawFirstPlayer();

            drawSecondPlayer();

            DrawBall();

            PrintResult();

            Thread.Sleep(60);

        }

    }

}