package org.jtheque.core.managers.view.impl.components;

 /*

  * This file is part of JTheque.

  *

  * JTheque is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, either version 3 of the License.

  *

  * JTheque 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 General Public License

  * along with JTheque.  If not, see <http://www.gnu.org/licenses/>.

  */

 import org.jtheque.core.managers.Managers;

 import org.jtheque.core.managers.view.able.IViewManager;

 import org.jtheque.core.managers.view.able.components.StateBarComponent;

 import org.jtheque.core.managers.view.listeners.StateBarEvent;

 import org.jtheque.core.managers.view.listeners.StateBarListener;

 import org.jtheque.utils.ui.GridBagUtils;

 import javax.swing.Box;

 import javax.swing.JPanel;

 import javax.swing.JSeparator;

 import java.awt.Color;

 import java.awt.Component;

 import java.awt.Dimension;

 import java.awt.GridBagLayout;

 import java.util.ArrayList;

 import java.util.Collections;

 import java.util.Comparator;

 import java.util.List;

 /**

  * A State Bar for JTheque.

  *

  * @author Baptiste Wicht

  */

 public final class JThequeStateBar extends JPanel implements StateBarListener {

     private int currentColumn;

     private final GridBagUtils gbc = new GridBagUtils();

     private boolean leftFilled;

     private boolean centerFilled;

     /**

      * Construct a new JThequeStateBar.

      */

     public JThequeStateBar() {

         super();

         setLayout(new GridBagLayout());

         setBackground(new Color(133, 144, 165));

         build();

     }

     /**

      * Build the state bar.

      */

     private void build() {

         List<StateBarComponent> components = new ArrayList<StateBarComponent>(Managers.getManager(IViewManager.class).getStateBarComponents());

         if (components.isEmpty()) {

             setVisible(false);

         } else {

             setVisible(true);

             Collections.sort(components, new LeftToRightComparator());

             currentColumn = 0;

             addLeftComponents(components);

             addCenterComponents(components);

             addRightComponents(components);

         }

         Managers.getManager(IViewManager.class).addStateBarListener(this);

     }

     /**

      * Add the components in the left.

      *

      * @param components The state bar components.

      */

     private void addLeftComponents(Iterable<StateBarComponent> components) {

         for (StateBarComponent component : components) {

             if (component.isLeft()) {

                 addComponent(component.getComponent());

                 leftFilled = true;

             }

         }

         addGlue();

     }

     /**

      * Add the components in the center.

      *

      * @param components The state bar components.

      */

     private void addCenterComponents(Iterable<StateBarComponent> components) {

         addGlue();

         if (leftFilled) {

             addSeparator();

         }

         for (StateBarComponent component : components) {

             if (component.isCenter()) {

                 addComponent(component.getComponent());

                 centerFilled = true;

             }

         }

         addGlue();

     }

     /**

      * Add the components in the right.

      *

      * @param components The state bar components.

      */

     private void addRightComponents(Iterable<StateBarComponent> components) {

         addGlue();

         if (centerFilled) {

             addSeparator();

         }

         for (StateBarComponent component : components) {

             if (component.isRight()) {

                 addComponent(component.getComponent());

             }

         }

     }

     /**

      * Add a glue.

      */

     private void addGlue() {

         add(Box.createHorizontalGlue(), gbc.gbcSet(

                 currentColumn++, 1, GridBagUtils.HORIZONTAL, GridBagUtils.BASELINE_LEADING, 1.0, 1.0));

     }

     /**

      * Add a separated component.

      *

      * @param component The component to add.

      */

     private void addComponent(Component component) {

         add(component, gbc.gbcSet(currentColumn++, 1));

     }

     /**

      * Add a separator.

      */

     private void addSeparator() {

         Component separator = new JSeparator(JSeparator.VERTICAL);

         separator.setPreferredSize(new Dimension(1, 10));

         add(separator, gbc.gbcSet(currentColumn++, 1));

     }

     @Override

     public void componentAdded() {

         build();

         Managers.getManager(IViewManager.class).refresh(this);

     }

     @Override

     public void componentRemoved(StateBarEvent event) {

         remove(event.getComponent().getComponent());

         if (Managers.getManager(IViewManager.class).getStateBarComponents().isEmpty()) {

             setVisible(false);

         }

         Managers.getManager(IViewManager.class).refresh(this);

     }

     /**

      * A comparator to sort the state bar component from left to right.

      *

      * @author Baptiste Wicht

      */

     private static final class LeftToRightComparator implements Comparator<StateBarComponent> {

         @Override

         public int compare(StateBarComponent component, StateBarComponent other) {

             return component.getPosition().compareTo(other.getPosition());

         }

     }

 }