/* Adventures in JavaScript

 * Listing 12.08

 * Checking user input

 */

​

​

var getGame = function () {

  // The spacer namespace

  var spacer = {

    blank: function () {

      return "";

    },

​

    newLine: function () {

      return "\n";

    },

​

    line: function (length, character) {

      var longString = "****************************************";

      longString += "----------------------------------------";

      longString += "========================================";

      longString += "++++++++++++++++++++++++++++++++++++++++";

      longString += "                                        ";

​

      length = Math.max(0, length);

      length = Math.min(40, length);

      return longString.substr(longString.indexOf(character), length);

    },

    wrap : function (text, length, character) {

      var padLength = length - text.length - 3;

      var wrapText = character + " " + text;      

      wrapText += spacer.line(padLength, " ");

      wrapText += character;

      return wrapText;

    },

​

    box: function (text, length, character) {

      var boxText = spacer.newLine();

      boxText += spacer.line(length, character) + spacer.newLine();

      boxText += spacer.wrap(text, length, character) + spacer.newLine(); 

      boxText += spacer.line(length, character) + spacer.newLine();

      return boxText;

    }

  };

​

​

  // Constructors

​

  var Player = function (name, health) {

    var newLine = spacer.newLine();

    var items = [];

    var place = null;

​

    var getNameInfo = function () {

        return name;

    };

​

    var getHealthInfo = function () {

        return "(" + health + ")";

    };

​

    var getItemsInfo = function () {

        var itemsString = "Items:" + newLine;

        items.forEach(function (item, i) {

            itemsString += "   - " + item + newLine;

        });

​

        return itemsString;

    };

    var getTitleInfo = function () {

        return getNameInfo() + " " + getHealthInfo();

    };

​

    var getInfo = function () {

        var info = spacer.box(getTitleInfo(), 40, "*");

        info += "  " + getItemsInfo();

        info += spacer.line(40, "*");

        info += newLine;

​

        return info;

    }; 

​

    this.addItem = function (item) {

        items.push(item);

    };

    this.setPlace = function (destination) {

        place = destination;

    };

    this.getPlace = function () {

        return place;

    };

​

    this.showInfo = function (character) {

        console.log(getInfo(character));

    };

  };

​

  var Place = function (title, description) {

    var newLine = spacer.newLine();

    var items = [];

    var exits = {};

    var getItemsInfo = function () {

        var itemsString = "Items: " + newLine;

        items.forEach(function (item) {

            itemsString += "   - " + item;

            itemsString += newLine;

        });

        return itemsString;

    };

    var getExitsInfo = function () {

        var exitsString = "Exits from " + title;

        exitsString += ":" + newLine;

        Object.keys(exits).forEach(function (key) {

            exitsString += "   - " + key;

            exitsString += newLine;

        });

        return exitsString;

    };

​

    var getTitleInfo = function () {

        return spacer.box(title, title.length + 4, "=");

    };

​

    var getInfo = function () {

        var infoString = getTitleInfo();

        infoString += description;

        infoString += newLine + newLine;

        infoString += getItemsInfo() + newLine;

        infoString += getExitsInfo();

        infoString += spacer.line(40, "=") + newLine;

        return infoString;

    };

​

    this.showInfo = function () {

        console.log(getInfo());

    };

​

    this.addItem = function (item) {

        items.push(item);

    };

    this.addExit = function (direction, exit) {

        exits[direction] = exit;

    };

​

    this.getExit = function (direction) {

        return exits[direction];

    };

    this.getLastItem = function () {

        return items.pop();

    };

  };

  // Console update function

  var render = function () {

    console.clear();

    player.getPlace().showInfo();

    player.showInfo();  

  };

  // Create some places

  var kitchen = new Place(

    "The Kitchen",

    "You are in a kitchen. There is a disturbing smell."

  );

  var library = new Place(

    "The Old Library",

    "You are in a library. Dusty books line the walls."

  );

  var garden = new Place(

    "The Kitchen Garden",

    "You are in a small, walled garden."

  );

  var cupboard = new Place(

    "The Kitchen Cupboard",

    "You are in a cupboard. It's surprisingly roomy."

  );

​

  // Add items and exits to places

  kitchen.addItem("a piece of cheese");

  library.addItem("a rusty key");

  cupboard.addItem("a tin of spam");

​

  kitchen.addExit("south", library);

  kitchen.addExit("west", garden);

  kitchen.addExit("east", cupboard);

​

  library.addExit("north", kitchen);

  garden.addExit("east", kitchen);

  cupboard.addExit("west", kitchen);

  // Game initialization

  var player = new Player("Kandra", 50);

  player.addItem("The Sword of Doom");

  player.setPlace(kitchen);

​

  render();

  // Return the public interface

  return {

    go: function (direction) {

      var place = player.getPlace();

      var destination = place.getExit(direction);

​

      if (destination !== undefined) {

        player.setPlace(destination);

        render();

        return "";

      } else {

        return "*** There is no exit in that direction ***";

      }

    },

​

    get: function () {

        var place = player.getPlace();

        var item = place.getLastItem();

​

        if (item !== undefined) {

            player.addItem(item);

            render();

            return "";

        } else {

            return "*** There is no item to get ***";

        }

    }    

  };

};

​

var game = getGame();

​

​

​

/* Further Adventures

 *

 * 1) Play the game, Using the three public methods:

 *

 *   > game.get()

 *   > game.go("north")

 *

 * 2) Try going in non-existent directions and

 *    getting items when there are none.

 *

 */