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

namespace _11.FallingRocks
{
    struct Position
    {
        public int row;
        public int col;
        public Position(int row, int col)
        {
            this.row = row;
            this.col = col;
        }
    }

    struct Rock
    {
        public string symbol;
        public int colour;
        public int length;
        public Position position;
        public Rock(string symbol, int colour, int length, Position position)
        {
            this.symbol = symbol;
            this.colour = colour;
            this.length = length;
            this.position = position;
        }
    }

    class FallingRocks
    {

        static void Main(string[] args)
        {
            byte right = 0;
            byte left = 1;
            byte stop = 2;
            Position[] directions = new Position[]
            {
                new Position(0, 1), // right
                new Position(0, -1), // left
                new Position(0, 0),  // stop
            };

            Rock[] rocks = new Rock[Console.BufferHeight];

            bool isAlive = true;
            bool collision = false;
            int points = 0;
            int randomSymbol,randomColour,randomLength;
            int index = 0;
            string rockSymbol = "";
            double sleepTime = 150;
            int direction = stop;
            Random randomNumbersGenerator = new Random();
            Console.CursorVisible = false;
            Console.BufferHeight = Console.WindowHeight;
            Console.BufferWidth = Console.WindowWidth;
            Position Dwarf = new Position(Console.BufferHeight-2, Console.BufferWidth/2);

            do
            {
                if (Console.KeyAvailable)
                {
                    ConsoleKeyInfo userInput = Console.ReadKey();
                    if (userInput.Key == ConsoleKey.LeftArrow)
                    {
                        direction = left;
                    }
                    if (userInput.Key == ConsoleKey.RightArrow)
                    {
                        direction = right;
                    }
                }

                Position nextDirection = directions[direction];
                Position newDwarf = new Position(Dwarf.row, Dwarf.col + nextDirection.col);

                if (newDwarf.col < 0 || newDwarf.col > Console.BufferWidth - 3)
                {
                    Console.SetCursorPosition(Dwarf.col, Dwarf.row);
                    Console.Write("(O)");
                }
                else
                {
                    Console.SetCursorPosition(newDwarf.col, newDwarf.row);
                    Console.Write("(O)");
                    Dwarf = newDwarf;
                }

                randomSymbol = randomNumbersGenerator.Next(0, 11);

                switch (randomSymbol)
                {
                    case 0: rockSymbol = "^"; break;
                    case 1: rockSymbol = "@"; break;
                    case 2: rockSymbol = "*"; break;
                    case 3: rockSymbol = "&"; break;
                    case 4: rockSymbol = "+"; break;
                    case 5: rockSymbol = "%"; break;
                    case 6: rockSymbol = "$"; break;
                    case 7: rockSymbol = "#"; break;
                    case 8: rockSymbol = "!"; break;
                    case 9: rockSymbol = "."; break;
                    case 10: rockSymbol = ";"; break;
                    case 11: rockSymbol = "-"; break;
                    default: Console.Write("Something's wrong with the symbols!"); break;
                }

                randomColour = randomNumbersGenerator.Next(0, 14);

                randomLength = randomNumbersGenerator.Next(1, 5);
                Position rockPosition = new Position(0, randomNumbersGenerator.Next(0, Console.BufferWidth - 1));
                rocks[index] = new Rock(rockSymbol, randomColour, randomLength, rockPosition);


                for (int i = 0; i < index; i++)
                {
                    Console.SetCursorPosition(rocks[i].position.col, rocks[i].position.row);

                    switch (rocks[i].colour)
                    {
                        case 0: Console.ForegroundColor = ConsoleColor.Blue; break;
                        case 1: Console.ForegroundColor = ConsoleColor.Cyan; break;
                        case 2: Console.ForegroundColor = ConsoleColor.DarkBlue; break;
                        case 3: Console.ForegroundColor = ConsoleColor.DarkCyan; break;
                        case 4: Console.ForegroundColor = ConsoleColor.DarkGray; break;
                        case 5: Console.ForegroundColor = ConsoleColor.DarkGreen; break;
                        case 6: Console.ForegroundColor = ConsoleColor.DarkMagenta; break;
                        case 7: Console.ForegroundColor = ConsoleColor.DarkRed; break;
                        case 8: Console.ForegroundColor = ConsoleColor.DarkYellow; break;
                        case 9: Console.ForegroundColor = ConsoleColor.Gray; break;
                        case 10: Console.ForegroundColor = ConsoleColor.Green; break;
                        case 11: Console.ForegroundColor = ConsoleColor.Magenta; break;
                        case 12: Console.ForegroundColor = ConsoleColor.Red; break;
                        case 13: Console.ForegroundColor = ConsoleColor.White; break;
                        case 14: Console.ForegroundColor = ConsoleColor.Yellow; break;
                        default: Console.Write("Something's wrong with the colour!"); break;
                    }

                    for (int j = 0; j < rocks[i].length; j++)
                    {
                        Console.Write(rocks[i].symbol);
                    }

                    rocks[i].position.row++;
                    if (rocks[i].position.row - 1 == Dwarf.row)
                    {
                        collision = ((Dwarf.col + 2 >= rocks[i].position.col) && (Dwarf.col + 2 <= rocks[i].position.col + rocks[i].length - 1)) || ((Dwarf.col >= rocks[i].position.col) && (Dwarf.col <= rocks[i].position.col + rocks[i].length - 1));
                        if (collision)
                        {
                            isAlive = false;
                            break;
                        }
                        for (int j = i; j < index ; j++)
                        {
                            rocks[j] = rocks[j + 1];
                        }
                        points++;
                        index--;
                    }
                    
                }

                Console.ForegroundColor = ConsoleColor.White;

                Thread.Sleep((int)sleepTime);
                index++;

                Console.Clear();

            } while (isAlive);

            Console.SetCursorPosition(Console.BufferWidth / 2 - 10, 0);
            Console.ForegroundColor = ConsoleColor.Green;
            Console.WriteLine("You made {0} points.\n\n", points);
            Console.CursorLeft = Console.BufferWidth / 2 - 5;
            Console.ForegroundColor = ConsoleColor.Red;
            Console.WriteLine("Game Over!");
            Console.ForegroundColor = ConsoleColor.White;
        }
    }
}