package fr.ifremer.dali.ui.swing.util.map.layer;
   
   /*-
    * #%L
    * Dali :: UI
    * %%
    * Copyright (C) 2014 - 2017 Ifremer
    * %%
    * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Affero General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   * 
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   * 
   * You should have received a copy of the GNU Affero General Public License
   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
   * #L%
   */
  
  import org.apache.commons.collections4.CollectionUtils;
  import org.geotools.geometry.jts.ReferencedEnvelope;
  import org.geotools.map.DirectLayer;
  import org.geotools.map.MapContent;
  import org.geotools.map.MapViewport;
  
  import java.awt.*;
  import java.awt.geom.Rectangle2D;
  import java.util.List;
  
  /**
   * @author peck7 on 14/09/2017.
   */
  public class InfoPanelLayer extends DirectLayer implements DataLayer {
  
      private Point point;
      private List<String> texts;
  
      private static final int LINE_LENGTH = 30;
      private static final int TEXT_BORDER = 10;
  
      public InfoPanelLayer() {
          setTitle("infoPanelLayer");
      }
  
      public void setInfo(Point point, List<String> texts) {
          this.point = point;
          this.texts = texts;
          setVisible(true);
      }
  
      public void clear() {
          point = null;
          texts = null;
      }
  
      private boolean isValid() {
          return point != null && CollectionUtils.isNotEmpty(texts);
      }
  
      @Override
      public void draw(Graphics2D graphics, MapContent map, MapViewport viewport) {
  
          if (!isValid()) return;
  
          Stroke oldStroke = graphics.getStroke();
          Paint oldPaint = graphics.getPaint();
          Color oldBackground = graphics.getBackground();
  
  //        graphics.setStroke(new BasicStroke(2, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL, 0, new float[]{9}, 0));
          graphics.setStroke(new BasicStroke(2));
          graphics.setPaint(Color.BLACK);
  
          // calculate text height and width
          FontMetrics fontMetrics = graphics.getFontMetrics();
          int maxTextWidth = 0;
          int maxTextHeight = 0;
          for (String text : texts) {
              Rectangle2D textRect = fontMetrics.getStringBounds(text, graphics);
              maxTextWidth = Math.max(maxTextWidth, (int) (textRect.getWidth() + 0.5));
              maxTextHeight = Math.max(maxTextHeight, (int) (textRect.getHeight() + 0.5));
          }
  
          int boxWidth = maxTextWidth + TEXT_BORDER * 2;
          int boxHeight = maxTextHeight * texts.size() + TEXT_BORDER * 2;
  
          graphics.setPaint(Color.WHITE);
          graphics.fillRoundRect(point.x - boxWidth / 2, point.y - LINE_LENGTH - boxHeight, boxWidth, boxHeight, 10, 10);
          graphics.setPaint(Color.BLACK);
          graphics.drawRoundRect(point.x - boxWidth / 2, point.y - LINE_LENGTH - boxHeight, boxWidth, boxHeight, 10, 10);
  
          for (int i = 0; i < texts.size(); i++) {
              graphics.drawString(texts.get(i),
                      point.x - maxTextWidth / 2,
                      point.y - LINE_LENGTH - maxTextHeight * texts.size() + (i * maxTextHeight));
          }
 
         graphics.drawLine(point.x, point.y, point.x, point.y - LINE_LENGTH);
 
         graphics.setStroke(oldStroke);
         graphics.setPaint(oldPaint);
         graphics.setBackground(oldBackground);
     }
 
     @Override
     public ReferencedEnvelope getBounds() {
         return null;
     }
 }