Falling rocks

using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Text;
using System.Threading;

class Exercise11FallingRocks
{
    public struct Position
    {
        public int row;
        public int col;
        public char randomChar;
        public ConsoleColor color;

        public Position(int row, int col, ConsoleColor color, char randomChar)
        {
            this.row = row;
            this.col = col;
            this.color = color;
            this.randomChar = randomChar;
        }
    }

    public static char[] rocksChar = { '@', '*', '&', '+', '%', '$', '#', '!', '.', ';' };
    public static string[] colors = { "Cyan", "Green", "Blue", "DarkCyan", "DarkGreen", "DarkYellow" };

    public static Random randomNum = new Random();

    public static List<Position> rocks = new List<Position>();
    public static List<Position> gun = new List<Position>();

    public static ConsoleColor color;
    public static int width;
    public static int height;
    public static int rockDensity;

    static void AddNewRow(int tempRow)
    {
        for (int y = 0; y < width; y++)
        {
            if (randomNum.Next(rockDensity) < 1)
            {
                if (randomNum.Next(30) < 1)
                {
                    if (randomNum.Next(2) < 1)
                    {
                        rocks.Add(new Position(tempRow, y, ConsoleColor.Yellow, '\u2660'));
                    }
                    else
                    {
                        rocks.Add(new Position(tempRow, y, ConsoleColor.Red, (char)3));
                    }
                }

                else
                {
                    color = (ConsoleColor)Enum.Parse(typeof(ConsoleColor), colors[randomNum.Next(colors.Length)]);
                    rocks.Add(new Position(tempRow, y, color, rocksChar[randomNum.Next(rocksChar.Length)]));

                    // add duplicate rocks
                    if (randomNum.Next(9) < 1 && y > 1 && y < width - 1)
                    {
                        y = y + 1;
                        rocks.Add(new Position(tempRow, y, rocks[rocks.Count - 1].color, rocks[rocks.Count - 1].randomChar));

                        if (randomNum.Next(12) < 1 && y > 1 && y < width - 1)
                        {
                            y = y + 1;
                            rocks.Add(new Position(tempRow, y, rocks[rocks.Count - 1].color, rocks[rocks.Count - 1].randomChar));
                        }
                    }
                }
            }
        }
    }

    static void ShowCollision(ConsoleColor tempColor)
    {
        for (int u = height; u > 8; u -= 1)
        {
            Console.BackgroundColor = tempColor;
            Console.SetCursorPosition(0, u);
            Console.Write("".PadRight(width, ' '));
            Thread.Sleep(1);
            Console.BackgroundColor = ConsoleColor.Black;
            Console.SetCursorPosition(0, u);
            Console.Write("".PadRight(width, ' '));
        }
    }

    static void DrawHelp()
    {
        for (int i = 0; i <= height + 1; i++)
        {
            Console.SetCursorPosition(width, i);
            Console.Write("|");
        }
        int infoRow = 2;

        Console.SetCursorPosition(width + 10, infoRow++);
        Console.Write("Falling rocks");
        Console.SetCursorPosition(width + 7, infoRow++); infoRow++;
        Console.Write("by Konstantin Dikov");
        Console.SetCursorPosition(width + 2, infoRow++); infoRow++;
        Console.ForegroundColor = ConsoleColor.White;
        Console.Write("Keys:");
        Console.ForegroundColor = ConsoleColor.DarkMagenta;
        Console.SetCursorPosition(width + 2, infoRow++);
        Console.Write("Left - Left arrow");
        Console.SetCursorPosition(width + 2, infoRow++);
        Console.Write("Right - Right arrow");
        Console.ForegroundColor = ConsoleColor.Magenta;
        Console.SetCursorPosition(width + 2, infoRow++);
        Console.Write("Gun - Spacebar");
        Console.SetCursorPosition(width + 2, infoRow++);
        Console.Write("Blast - Enter");
        Console.ForegroundColor = ConsoleColor.DarkMagenta;
        Console.SetCursorPosition(width + 2, infoRow++);
        Console.Write("Up arrow - Increase density");
        Console.SetCursorPosition(width + 2, infoRow++);
        Console.Write("Down arrow - Decrease density"); infoRow++;
        Console.SetCursorPosition(width + 2, infoRow++); infoRow++;
        Console.ForegroundColor = ConsoleColor.White;
        Console.Write("Tips:");
        Console.ForegroundColor = ConsoleColor.DarkMagenta;
        Console.SetCursorPosition(width + 2, infoRow++);
        Console.Write("- Higher density = more points");
        Console.SetCursorPosition(width + 2, infoRow++);
        Console.Write("- Blast points x 4");
    }

    static void Main()
    {
        Console.CursorVisible = false;
        Console.Title = "Falling Rocks - by Konstantin Dikov";
        ConsoleKey keyPressed;
        Console.BufferWidth = Console.WindowWidth = 82;
        Console.BufferHeight = Console.WindowHeight = 25;
        width = 48;
        height = 23;
        int offset = 5;
        int currentRow = 0;
        rockDensity = 39;
        int score = 0;
        int highScore = 0;
        int lifes = 5;
        int blasts = 5;
        int blastPosition = 0;
        bool gameOver = false;
        int scoreFormula = 0;
        string spaces = new string(' ', width);

        Position dwarf = new Position();
        dwarf.col = width / 2;
        dwarf.row = height;
        dwarf.color = ConsoleColor.White;

        string dwarfString = "(0)";

        //draw ground and ------
        Console.SetCursorPosition(0, 3);
        Console.Write("".PadRight(width, '-'));
        Console.SetCursorPosition(0, height + 1);
        Console.BackgroundColor = ConsoleColor.DarkRed;
        Console.Write("".PadRight(width, ' '));
        Console.BackgroundColor = ConsoleColor.Black;
        //
        DrawHelp();

        AddNewRow(currentRow);

        //check if file with highscore exist
        if (!File.Exists("highscore.txt"))
        {
            StreamWriter saveScoreFile = new StreamWriter("highscore.txt");
            saveScoreFile.WriteLine("0");
            saveScoreFile.Close();
        }
        else
        {
            StreamReader readHighScore = new StreamReader("highscore.txt");
            highScore = int.Parse(readHighScore.ReadLine());
            readHighScore.Close();
        }
        //
        double timeDelay = Environment.TickCount;
        double gunDelay = Environment.TickCount;
        while (!gameOver)
        {
            if (Environment.TickCount - timeDelay > 150)
            {
                //clear last row
                Console.SetCursorPosition(0, dwarf.row);
                Console.ForegroundColor = ConsoleColor.Black;
                Console.Write(spaces);

                //draw dwarf just to prevent dwarf blinking
                Console.SetCursorPosition(dwarf.col, dwarf.row);
                Console.ForegroundColor = (dwarf.color);
                Console.Write(dwarfString);

                for (int i = 0; i < rocks.Count; i++)
                {
                    if (offset - rocks[i].row == dwarf.row && rocks[i].col >= dwarf.col &&
                        rocks[i].col <= dwarf.col + 2)
                    {
                        if (rocks[i].randomChar == '\u2660')
                        {
                            if (blasts < 6)
                            {
                                ShowCollision(ConsoleColor.Yellow);
                                blasts = blasts + 1;
                            }
                        }
                        else if (rocks[i].randomChar == (char)3)
                        {
                            if (lifes < 6)
                            {
                                ShowCollision(ConsoleColor.Green);
                                lifes = lifes + 1;
                            }
                        }
                        else
                        {
                            lifes = lifes - 1;
                            if (lifes == 0)
                            {
                                gameOver = true;
                                break;
                            }
                            else
                            {
                                ShowCollision(ConsoleColor.DarkRed);
                            }
                        }

                    }
                    // clear rocks
                    Console.SetCursorPosition(rocks[i].col, offset - rocks[i].row - 1);
                    Console.ForegroundColor = ConsoleColor.Black;
                    Console.Write(" ");
                    // draw rocks
                    Console.SetCursorPosition(rocks[i].col, offset - rocks[i].row);
                    Console.ForegroundColor = (rocks[i].color);
                    Console.Write(rocks[i].randomChar);
                }

                timeDelay = Environment.TickCount;

                scoreFormula = (109 - rockDensity) / 9;
                score = score + rocks.RemoveAll(r => r.row == offset - height) * scoreFormula;

                offset = offset + 1;
                currentRow = currentRow + 1;
                AddNewRow(currentRow);

                //draw info board: score, lifes and blasts
                Console.BackgroundColor = ConsoleColor.DarkRed;
                Console.ForegroundColor = ConsoleColor.White;
                Console.SetCursorPosition(0, 0);
                Console.WriteLine(" Score {0:D6} | High score {1:D6} | Density: {2:D2}%", score, highScore, 109 - rockDensity);

                Console.BackgroundColor = ConsoleColor.DarkMagenta;
                Console.SetCursorPosition(0, 1);
                Console.Write(" Lifes: ");
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine("".PadRight(lifes, (char)3) + "".PadRight(6 - lifes, ' '));

                Console.ForegroundColor = ConsoleColor.White;
                Console.SetCursorPosition(13, 1);
                Console.Write(" | Gun: ");
                Console.ForegroundColor = ConsoleColor.White;
                Console.WriteLine("Infinite ");
                Console.Write("Blasts: ");
                Console.ForegroundColor = ConsoleColor.Yellow;
                Console.Write("".PadRight(blasts, '\u2660') + "".PadRight(6 - blasts, ' '));

                Console.BackgroundColor = ConsoleColor.Black;

                if (gameOver) break;
            }

            if (Console.KeyAvailable)
            {
                keyPressed = Console.ReadKey(true).Key;

                if (keyPressed == ConsoleKey.LeftArrow && dwarf.col > 0)
                {
                    //draw speed trail
                    Console.SetCursorPosition(dwarf.col + 2, dwarf.row);
                    Console.ForegroundColor = ConsoleColor.DarkGray;
                    Console.Write(">");

                    dwarf.col = dwarf.col - 1;
                }
                else if (keyPressed == ConsoleKey.RightArrow && dwarf.col < width - 3)
                {
                    //draw speed trail
                    Console.SetCursorPosition(dwarf.col, dwarf.row);
                    Console.ForegroundColor = ConsoleColor.DarkGray;
                    Console.Write("<");

                    dwarf.col = dwarf.col + 1;
                }
                else if (keyPressed == ConsoleKey.DownArrow && rockDensity < 100)
                {
                    rockDensity = rockDensity + 1;
                }
                else if (keyPressed == ConsoleKey.UpArrow && rockDensity > 10)
                {
                    rockDensity = rockDensity - 1;
                }
                else if (keyPressed == ConsoleKey.Enter && blasts > 0)
                {
                    for (int z = 0; z < 15; z++)
                    {
                        blastPosition = dwarf.col - z;
                        if (dwarf.col >= width - z - 1)
                            blastPosition = width - 2 * (z + 1);
                        if (dwarf.col <= z)
                            blastPosition = 0;

                        Console.BackgroundColor = ConsoleColor.Yellow;
                        Console.SetCursorPosition(blastPosition, dwarf.row - 1 - z);
                        Console.Write("   ".PadRight(2 * (z + 1), ' '));
                        score = score + scoreFormula * 4 * rocks.RemoveAll(r => (r.row == offset - (height - z)) &&
                                     (r.col >= blastPosition) &&
                                     (r.col < blastPosition + 2 * (z + 1)));

                        Thread.Sleep(20);

                        Console.BackgroundColor = ConsoleColor.Black;
                        Console.SetCursorPosition(blastPosition, dwarf.row - 1 - z);
                        Console.Write("   ".PadRight(2 * (z + 1), ' '));

                    }

                    blasts = blasts - 1;
                    Console.BackgroundColor = ConsoleColor.Black;

                }

                else if (keyPressed == ConsoleKey.Spacebar)
                {
                    gun.Add(new Position(dwarf.row - 1, dwarf.col + 1, ConsoleColor.Green, 'o'));

                    Console.SetCursorPosition(dwarf.col + 1, dwarf.row - 1);
                    Console.ForegroundColor = gun[gun.Count - 1].color;
                    Console.Write(gun[gun.Count - 1].randomChar);
                }
            }

            //move bullets
            if (Environment.TickCount - gunDelay > 50)
            {
                for (int i = 0; i < gun.Count; i++)
                {


                    if (rocks.RemoveAll(nn => (nn.row == offset - gun[i].row - 1) && (nn.col == gun[i].col)) > 0)
                    {
                        score = score + scoreFormula * 2;

                        Console.SetCursorPosition(gun[i].col, gun[i].row);
                        Console.ForegroundColor = ConsoleColor.Black;
                        Console.Write(" ");
                        gun.RemoveAt(i);
                        i--;
                    }
                    else if (rocks.RemoveAll(nn => (nn.row == offset - gun[i].row) && (nn.col == gun[i].col)) > 0)
                    {
                        score = score + scoreFormula * 2;

                        Console.SetCursorPosition(gun[i].col, gun[i].row - 1);
                        Console.ForegroundColor = ConsoleColor.Black;
                        Console.Write(" ");
                        Console.SetCursorPosition(gun[i].col, gun[i].row);
                        Console.Write(" ");
                        gun.RemoveAt(i);
                        i--;
                    }
                    else
                    {
                        Console.MoveBufferArea(gun[i].col, gun[i].row, 1, 1, gun[i].col, gun[i].row - 1);
                        if (gun[i].row > 5)
                        {
                            gun[i] = new Position(gun[i].row - 1, gun[i].col, gun[i].color, gun[i].randomChar);
                        }
                        else
                        {
                            Console.SetCursorPosition(gun[i].col, gun[i].row - 1);
                            Console.ForegroundColor = ConsoleColor.Black;
                            Console.Write(" ");
                            gun.RemoveAt(i);
                            i--;
                        }

                    }
                }
                gunDelay = Environment.TickCount;
            }

            // draw dwarf
            Console.SetCursorPosition(dwarf.col, dwarf.row);
            Console.ForegroundColor = (dwarf.color);
            Console.Write(dwarfString);

        }

        Console.SetCursorPosition(width / 2 - 5, height / 2);
        Console.ForegroundColor = ConsoleColor.White;
        Console.BackgroundColor = ConsoleColor.Red;
        Console.WriteLine(" GAME OVER ");

        if (score > highScore)
        {
            Console.SetCursorPosition(width / 2 - 7, height / 2 + 1);
            Console.ForegroundColor = ConsoleColor.White;
            Console.BackgroundColor = ConsoleColor.DarkGreen;
            Console.WriteLine(" NEW HIGH SCORE ");
        }

        Console.SetCursorPosition(5, height / 2 + 3);
        Console.ForegroundColor = ConsoleColor.White;
        Console.BackgroundColor = ConsoleColor.Black;

        Console.Write("Press \"Y\" to play again or \"N\" to quit");

        while (true)
        {
            if (score > highScore)
            {
                StreamWriter saveScoreFile = new StreamWriter("highscore.txt");
                saveScoreFile.WriteLine(score);
                saveScoreFile.Close();
            }

            if (Console.KeyAvailable)
            {
                ConsoleKeyInfo newGame = Console.ReadKey(true);
                if (newGame.Key == ConsoleKey.Y)
                {
                    rocks.RemoveAll(c => c.row >= 0);
                    Console.Clear();
                    Main();
                }
                if (newGame.Key == ConsoleKey.N)
                {
                    break;
                }
            }
        }
    }
}