using System;
using System.Collections.Generic;

namespace Challenge {
    /// <summary> The game class. </summary>
    public class Game {
        /// <summary> The variables. </summary>
        private static Dictionary <string, string> Variables;
        /// <summary> Whether the game is running. </summary>
        private static bool Running;
        /// <summary> The grid. </summary>
        private static bool[][] Grid;

        /// <summary> Waits for the given key to be pressed. </summary>
        /// <param name='key'> The key to wait for. </param>
        private static void WaitForKey(ConsoleKey key)
        {
            Console.WriteLine("Press the '{0}' key to continue.",
                            key.ToString());
            while (Console.ReadKey().Key != key)
                ;
        }

        /// <summary> Waits for the Enter key to be pressed. </summary>
        private static void WaitForKey()
        {
            Game.WaitForKey(ConsoleKey.Enter);
        }

        /// <summary> Handles user input. </summary>
        private static void HandleInputs()
        {
            Console.Write("> ");
            string[] tokens = Console.ReadLine().Split();
            if (tokens.Length < 1)
                return;
            switch (tokens[0].ToLower()) {
            case "get":
                if (tokens.Length < 2) {
                    Console.WriteLine("Usage: get <variable>");
                    Game.WaitForKey();
                    break;
                }
                if (!(Game.Variables.ContainsKey(tokens[1]))) {
                    Console.WriteLine("Invalid variable name. Valid names are: ");
                    foreach (string key in Variables.Keys)
                        Console.WriteLine("\t{0}", key);
                    Game.WaitForKey();
                } else {
                    Console.WriteLine("'{0}'='{1}'",
                    tokens[1], Game.Variables[tokens[1]]);
                    Game.WaitForKey();
                }
                break;
            case "set":
                if (tokens.Length < 3) {
                    Console.WriteLine("Usage: set <variable> <value>");
                    Game.WaitForKey();
                    break;
                }
                if (!(Game.Variables.ContainsKey(tokens[1]))) {
                    Console.WriteLine("Invalid variable name. Valid names are: ");
                    foreach (string key in Variables.Keys)
                        Console.WriteLine("\t{0}", key);
                    Game.WaitForKey();
                } else {
                    Game.Variables[tokens[1]] = tokens[2];
                }
                break;
            case "h":
            case "help":
            case "?":
                Console.WriteLine("Commands:");
                Console.WriteLine("h/help/?\tShow this help.");
                Console.WriteLine("get\t\tGet a variable");
                Console.WriteLine("set\t\tSet a variable");
                Console.WriteLine("quit\t\tQuit game.");
                Game.WaitForKey();
                break;
            case "quit":
                Game.Running = false;
                break;
            }
        }

        /// <summary> Creates the grid. </summary>
        private static void CreateGrid()
        {
            int width, height;
            if (!(int.TryParse(Game.Variables["width"], out width)) || width < 0) {
                Console.WriteLine("Invalid value 'width'='{0}'",
                            Game.Variables["width"]);
                Game.WaitForKey();
                return;
            }
            if (!(int.TryParse(Game.Variables["height"], out height)) || height < 0) {
                Console.WriteLine("Invalid value 'height'='{0}'",
                            Game.Variables["height"]);
                return;
            }
            if (width == 0 || height == 0)
                return;
            Game.Grid = new bool[height][];
            for (int j = 0; j < height; ++j) {
                Game.Grid[j] = new bool[width];
                for (int i = 0; i < width; ++i) {
                    Game.Grid[j][i] = false;
                    int index = j * width + i;
                    string sw = String.Format("sw{0}", index);
                    if (!(Game.Variables.ContainsKey(sw))) {
                        Game.Variables.Add(sw, "false");
                    } else {
                        bool val;
                        if (!(bool.TryParse(Game.Variables[sw], out val))) {
                            Console.WriteLine("Invalid value '{0}'='{1}'",
                            sw, Game.Variables[sw]);
                            Game.WaitForKey();
                            return;
                        }
                        Game.Grid[j][i] = val;
                    }
                }
            }
        }

        /// <summary> Updates the screen. </summary>
        private static void UpdateScreen()
        {
            Console.Clear();
            if (Game.Grid == null)
                return;
            for (int j = 0; j < Game.Grid.Length; ++j) {
                if (Game.Grid[j] == null)
                    return;
                for (int i = 0; i < Game.Grid[j].Length; ++i)
                    Console.Write((Game.Grid[j][i]) ? '1' : '0');
                Console.WriteLine();
            }
        }

        /// <summary> The Main function. </summary>
        public static void Main()
        {
            Game.Variables = new Dictionary<string, string>();
            Game.Variables.Add("width", "0");
            Game.Variables.Add("height", "0");
            Game.Running = true;
            while (Game.Running) {
                Game.HandleInputs();
                Game.CreateGrid();
                Game.UpdateScreen();
            }

        }
    }
}