/*******************************************************************************
    * Copyright 2013 Universidad Politécnica de Madrid
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *   http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   ******************************************************************************/
  
  package org.universAAL.ui.handler.gui.swing.model.FormControl;
  
  import java.awt.GridLayout;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import java.awt.event.FocusEvent;
  import java.awt.event.FocusListener;
  import java.util.Iterator;
  import java.util.List;
  
  import javax.swing.Icon;
  import javax.swing.JButton;
  import javax.swing.JComponent;
  import javax.swing.JLabel;
  import javax.swing.JPanel;
  import javax.swing.SwingUtilities;
  
  import org.universAAL.middleware.ui.rdf.Form;
  import org.universAAL.middleware.ui.rdf.FormControl;
  import org.universAAL.middleware.ui.rdf.Repeat;
  import org.universAAL.ui.handler.gui.swing.Renderer;
  import org.universAAL.ui.handler.gui.swing.model.FormControl.support.RepeatSubdivider;
  import org.universAAL.ui.handler.gui.swing.model.FormControl.support.TaskQueue;
  
  /**
   * An alternative to drawing Repeats, Specially indicated for editable repeats, since forms whould be modeled and rendered with in a 
   * {@link JPanel} fitted with a {@link GridLayout}.
   * @author amedrano
   *
   */
  public class RepeatModelGrid extends RepeatModel {
  
  	/**
  	 * The {@link GridLayout}, useful for extenders of this class to access and change the v and h gaps.
  	 */
  	private GridLayout layout;
  	
      /**
       * container for children of {@link #repeat}
       */
      private FormControl[] elems;
  
  	private JPanel grid;
  
  	private RepeatSubdivider subDivider;
  
  	/**
  	 * @param control
  	 * @param render
  	 */
  	public RepeatModelGrid(Repeat control, Renderer render) {
  		super(control, render);
  	}
  
  	/** {@ inheritDoc}	 */
  	public JComponent getNewComponent() {
  		Repeat r = (Repeat)fc;
  		subDivider = new RepeatSubdivider(r);
  		elems = subDivider.getElems();
  		grid = new JPanel();
  		updateLayout();
  		return grid;
  	}
  	
  	private void updateLayout(){
  		layout = new GridLayout(0,elems.length);
  		//TODO implement MyGridLayout which adjusts columns independently.
  		grid.setLayout(layout);
  	}
  	
  	private void reDrawPanel(){
  		update();
  		grid.revalidate();
  	}
  	
  	/** {@ inheritDoc}	 */
  	public void update(){
  		grid.removeAll();
  		Repeat r = (Repeat)fc;
  		subDivider = new RepeatSubdivider(r);
  		elems = subDivider.getElems();
  		updateLayout();
  		updateContents();		
 	}
 	
 	
 	protected void updateContents() {
 		int ii = 0;
 		for (int i = 0; i < elems.length; i++) {
 			JLabel colLabel = 
 					getRenderer().getModelMapper()
 					.getModelFor(elems[i].getLabel()).getComponent();
 			grid.add(colLabel);
 		}
 		List forms = subDivider.generateSubForms();
 		for (Iterator i = forms.iterator(); i.hasNext();) {
 			Form f = (Form) i.next();
 			FormControl[] fcs = f.getIOControls().getChildren();
 			for (int j = 0; j < fcs.length; j++) {
 				JComponent jc = getRenderer()
 						.getModelMapper().getModelFor(fcs[j]).getComponent();
 				jc.addFocusListener(new RowChanger(ii));
 				grid.add(jc);
 			}
 			ii++;
 		}
 	}
 
 	/**
 	 * See {@link RepeatModelGrid#layout}.
 	 * @return The layout used for the JPanel containing the repeat sub components.
 	 */
 	protected GridLayout getLayout(){
 		return layout;
 	}
 	
 	protected JPanel getButtonPanel() {
 		Repeat r = (Repeat)fc;
 
 		JPanel buttonPanel = new JPanel();
 		if (r.listAcceptsNewEntries()) {
 			buttonPanel.add(new AddTableButton());
 		}
 		if (r.listEntriesDeletable()) {
 			buttonPanel.add(new DeleteTableButton());
 		}
 		return buttonPanel;
 	}
 	
 	/**
 	 * Class representing the Add button for Tables.
 	 * @author amedrano
 	 */
 	public class AddTableButton extends JButton implements ActionListener {
 
 		public AddTableButton(Icon icon) {
 			super(icon);
 			this.addActionListener(this);
 			this.setName(fc.getURI()+"_Add");
 		}
 
 		public AddTableButton(String text, Icon icon) {
 			super(text, icon);
 			this.addActionListener(this);
 			this.setName(fc.getURI()+"_Add");
 		}
 
 		public AddTableButton(String text) {
 			super(text);
 			this.addActionListener(this);
 			this.setName(fc.getURI()+"_Add");
 		}
 
 		/**
 		 * Java Serializer Variable
 		 */
 		private static final long serialVersionUID = 1L;
 
 		/**
 		 * Constructor for Add button
 		 */
 		public AddTableButton() {
 			super();
 			this.addActionListener(this);
 			this.setName(fc.getURI()+"_Add");
 		}
 
 		/** {@inheritDoc}*/
 		public void actionPerformed(ActionEvent e) {
 			SwingUtilities.invokeLater(new Runnable() {
 				public void run() {
 					if (((Repeat)fc).addValue()){
 						// re draw the whole Panel.
 						reDrawPanel();
 					}
 				}
 			});
 		}
 	}
 
 	/**
 	 * Class representing the Delete button for Tables.
 	 * @author amedrano
 	 */
 	public class DeleteTableButton extends JButton implements ActionListener {
 
 		public DeleteTableButton(Icon icon) {
 			super(icon);
 			this.addActionListener(this);
 			this.setName(fc.getURI()+"_Delete");
 		}
 
 		public DeleteTableButton(String text, Icon icon) {
 			super(text, icon);
 			this.addActionListener(this);
 			this.setName(fc.getURI()+"_Delete");
 		}
 
 		public DeleteTableButton(String text) {
 			super(text);
 			this.addActionListener(this);
 			this.setName(fc.getURI()+"_Delete");
 		}
 
 		/**
 		 * Java Serializer Variable
 		 */
 		private static final long serialVersionUID = 1L;
 
 		
 		/**
 		 * Constructor for Remove Button
 		 */
 		public DeleteTableButton() {
 			super();
 			this.addActionListener(this);
 			this.setName(fc.getURI()+"_Delete");
 		}
 		
 		/** {@inheritDoc}*/
 		public void actionPerformed(ActionEvent e) {
 			SwingUtilities.invokeLater(new Runnable() {
 				public void run() {
 					if (((Repeat)fc).addValue()){
 						// re draw the whole Panel.
 						reDrawPanel();
 					}
 				}
 			});
 		}
 	}
 	
 	private class RowChanger implements FocusListener {
 		
 		private int row;
 		
 		
 
 		/**
 		 * Create a Row listener that will change the selected row when the element is selected.
 		 * @param row the row at which the listened element is at.
 		 */
 		public RowChanger(int row) {
 			super();
 			this.row = row;
 		}
 
 		/** {@ inheritDoc}	 */
 		public void focusGained(FocusEvent e) {
 			TaskQueue.addTask(new Runnable() {
 				public void run() {
 					// change the repeat's lselected row to the row of this component.
 					Repeat r = (Repeat) fc;
 					r.setSelection(row);
 				}
 			});
 		}
 
 		/** {@ inheritDoc}	 */
 		public void focusLost(FocusEvent e) {
 			// Nothing, another component will be called to focusGained().
 		}
 		
 	}
 }