package XmlImporter;

import java.util.ArrayList;
import java.util.List;

import breakout.BlockTemplateDocument.BlockTemplate;
import breakout.ColorTypeDocument.ColorType;
import BOut.BlockDesc;

/**
 * Singleton Factory that constructs BlockDesc descriptions out of the block specification in a Block Template.
 *
 * @author Eliot MOss
 */
public class BlockDescFactory {
	//Comment: List of BlockDesc objects that have been created
  private static List<BlockDesc> blockDescList = new ArrayList<BlockDesc>();
  // the singleton instance
  private static BlockDescFactory instance = new BlockDescFactory();

  // private to enforce singleton
  private BlockDescFactory () { }

  /**
   * getter for the singleton
   * @return the singleton BlockDescFactory instance
   */
  public static BlockDescFactory getInstance ()
  {
    return instance;
  }

  /**
   * Returns the unique BlockDesc corresponding to the template's
   * specification of width, height, and color
   * @param template a BlockTemplate giving width and height of a rectangular block, and RGB color
   * @return the BlockDesc for that appearance (guaranteed only one for a given appearance)
   */
  /* Comment: Checks if a BlockDesc object exists in the List if so it will finds
   * and return it. Otherwise it creates a BlockDesc object and returns it.
   */
  public static BlockDesc getBlockDesc (BlockTemplate template)
  {
    int width = Integer.parseInt(template.getWidth());
    int height = Integer.parseInt(template.getHeight());
    ColorType color = template.getColorType();
    int r = color.getR();
    int g = color.getG();
    int b = color.getB();
    //Comment: Loops through list looking for matching BlockDesc object
    for(int index = 0; index < blockDescList.size(); index++)
	  {
		  if(width == blockDescList.get(index).getWidth()&&height == blockDescList.get(index).getHeight()
				  &&r == blockDescList.get(index).getR()&&g == blockDescList.get(index).getG()
				  &&b == blockDescList.get(index).getB())
		  {
			  return blockDescList.get(index);
		  }
	  }

    BlockDesc uniqueDesc = new BlockDesc(width, height, r, g, b);
    blockDescList.add(uniqueDesc);
    return uniqueDesc;
  }


}