package de.unisiegen.tpml.graphics.components ;


import java.awt.Dimension ;
import java.awt.FontMetrics ;
import java.awt.Graphics ;
import java.awt.Polygon ;
import javax.swing.JComponent ;
import de.unisiegen.tpml.core.util.Theme ;
import de.unisiegen.tpml.graphics.renderer.AbstractRenderer ;
import de.unisiegen.tpml.graphics.renderer.PrettyStringRenderer ;


/**
 * this class renders the Nail Symbol
 * 
 * @author Benjamin Mies
 */
public class NailSymbolComponent extends JComponent
{
  /**
   * The unique serialization identifier for this class.
   */
  private static final long serialVersionUID = - 1108849991978877212L ;


  /**
   * Renderer that is used to render the label
   */
  private PrettyStringRenderer renderer ;


  /**
   * the constructor
   */
  public NailSymbolComponent ( )
  {
    super ( ) ;
    this.renderer = new PrettyStringRenderer ( ) ;
  }


  /**
   * Causes the PrettyStringRenderer to recheck the linewraps
   */
  public void reset ( )
  {
    if ( this.renderer != null )
    {
      this.renderer.checkLinewraps ( ) ;
    }
  }


  /**
   * Calculates the size needed to propperly render the labelComponent
   * 
   * @param maxWidth
   * @return the Dimension needed to render the label
   */
  public Dimension getNeededSize ( @ SuppressWarnings ( "unused" )
  int maxWidth )
  {
    Dimension result = new Dimension ( 0 , 0 ) ;
    result.width += AbstractRenderer.getTextFontMetrics ( ).stringWidth ( "--" ) ; //$NON-NLS-1$
    return result ;
  }


  /**
   * The actualy rendering method.
   * 
   * @param gc The Graphics object that will be used to render the stuff.
   */
  @ Override
  protected void paintComponent ( Graphics gc )
  {
    // make sure that we have a type to renderer
    if ( this.renderer == null )
    {
      return ;
    }
    // assuming the size of the component will suffice, no testing
    // of any sizes will happen.
    /*
     * just to get reminded: no environment: expression storeenvironment:
     * (expression [env]) typeenvironment: [env] |> expression
     */
    int posX = 0 ;
    // draw the arrow character in the vertical center
    int centerV = getHeight ( ) / 2 ;
    centerV += AbstractRenderer.getTextFontMetrics ( ).getAscent ( ) / 2 ;
    gc.setFont ( AbstractRenderer.getTextFont ( ) ) ;
    FontMetrics fm = AbstractRenderer.getTextFontMetrics ( ) ;
    gc.setColor ( Theme.currentTheme ( ).getExpressionColor ( ) ) ;
    // The nail as Polygon
    Polygon polygon = new Polygon ( ) ;
    // polygon.addPoint ( posX, ( posY - AbstractRenderer.fontHeight / 2 +
    // fontDescent )
    // + AbstractRenderer.fontHeight / 5 );
    // polygon.addPoint ( posX, ( posY - AbstractRenderer.fontHeight / 2 +
    // fontDescent )
    // - AbstractRenderer.fontHeight / 5 );
    // polygon.addPoint ( posX, posY - AbstractRenderer.fontHeight / 2 +
    // fontDescent );
    // polygon.addPoint ( posX + AbstractRenderer.keywordFontMetrics.stringWidth
    // ( "--" ), posY
    // - AbstractRenderer.fontHeight / 2 + fontDescent );
    // polygon.addPoint ( posX, posY - AbstractRenderer.fontHeight / 2 +
    // fontDescent );
    polygon.addPoint ( posX , ( fm.getAscent ( ) - fm.getHeight ( ) / 2 + fm
        .getDescent ( ) )
        + fm.getHeight ( ) / 5 ) ;
    polygon.addPoint ( posX , ( fm.getAscent ( ) - fm.getHeight ( ) / 2 + fm
        .getDescent ( ) )
        - fm.getHeight ( ) / 5 ) ;
    polygon.addPoint ( posX , fm.getAscent ( ) - fm.getHeight ( ) / 2
        + fm.getDescent ( ) ) ;
    polygon.addPoint ( posX + fm.stringWidth ( "--" ) , fm.getAscent ( ) //$NON-NLS-1$
        - fm.getHeight ( ) / 2 + fm.getDescent ( ) ) ;
    polygon.addPoint ( posX , fm.getAscent ( ) - fm.getHeight ( ) / 2
        + fm.getDescent ( ) ) ;
    // render it
    gc.drawPolygon ( polygon ) ;
  }
}