/**
 * @file Common.java
 *
 * @author Christos Choutouridis AEM:8997
 * @email  cchoutou@ece.auth.gr
 */
package net.hoo2.auth.labyrinth;

/**
 * Application wide object to hold settings like values for the session.
 */
class Defaults {
   static int  boardSize = 15;      /**@< Default board's size (if no one set it via command line) */
}

/**
 * Helper C++-like enumerator class to hold direction
 */
class Direction {
   static final int  UP    =1;   /**< North direction */
   static final int  RIGHT =3;   /**< East direction */
   static final int  DOWN  =5;   /**< South direction */
   static final int  LEFT  =7;   /**< West direction */
}

/**
 * @brief
 *    An Application wide board position implementation holding just the coordinates
 *
 * Position is a helper class to enable us cope with the redundant position data (id and coordinates).
 * This class provide both static conversion functionalities between id and coordinates
 * and data representation in the coordinates system.
 */
class Position {

   /**
    * Basic constructor from coordinates
    * @param x    The x coordinate
    * @param y    The y coordinate
    */
   protected Position(int x, int y) {
      this.x = x;
      this.y = y;
   }

   /**
    * Basic constructor from Id
    * @param tileId  The id of tile
    */
   protected Position(int tileId) {
      this.x = toX(tileId);
      this.y = toY(tileId);
   }

   /** @name non-static API */
   /** @{ */
   protected int getX() { return x; }     /**< Read access to x coordinate */
   protected int getY() { return y; }     /**< Read access to y coordinate */
   protected int getID(){ return toID(x, y); }  /**< Virtual read access to id coordinate */
   /** @} */

   /** @name Static convention utilities */
   /** @{ */
   /**
    * Takes x and y coordinates and return the calculated Id coordinate
    * @param x    The x coordinate
    * @param y    The y coordinate
    * @return     The converted value
    */
   protected static int toID(int x, int y) {
      return y * Defaults.boardSize + x;
   }

   /**
    * Takes Id coordinate and return the corresponding x coordinate
    * @param id   The id coordinate
    * @return     The x coordinate
    */
   protected static int toX(int id){
      return id % Defaults.boardSize;
   }
   /**
    * Takes Id coordinate and return the corresponding y coordinate
    * @param id   The id coordinate
    * @return     The y coordinate
    */
   protected static int toY(int id) {
      return id / Defaults.boardSize;
   }
   /** @} */

   /** @name private data types */
   /** @{ */
   private int x;    /**< The x coordinate of the constructed Position object */
   private int y;    /**< The y coordinate of the constructed Position object */
   /** @} */
}