/*
    *  
    *  Fosstrak LLRP Commander (www.fosstrak.org)
    * 
    *  Copyright (C) 2008 ETH Zurich
    *
    *  This program 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, 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 General Public License
   *  along with this program.  If not, see <http://www.gnu.org/licenses/> 
   *
   */
  
  package org.fosstrak.llrp.commander.dialogs;
  
  import org.eclipse.jface.dialogs.Dialog;
  import org.eclipse.jface.window.Window;
  import org.eclipse.swt.SWT;
  import org.eclipse.swt.events.SelectionAdapter;
  import org.eclipse.swt.events.SelectionEvent;
  import org.eclipse.swt.events.SelectionListener;
  import org.eclipse.swt.layout.GridData;
  import org.eclipse.swt.layout.GridLayout;
  import org.eclipse.swt.widgets.Button;
  import org.eclipse.swt.widgets.Composite;
  import org.eclipse.swt.widgets.Control;
  import org.eclipse.swt.widgets.Event;
  import org.eclipse.swt.widgets.Label;
  import org.eclipse.swt.widgets.Listener;
  import org.eclipse.swt.widgets.Shell;
  import org.eclipse.swt.widgets.Text;
  import org.fosstrak.llrp.client.Repository;
  import org.fosstrak.llrp.commander.ResourceCenter;
  import org.fosstrak.llrp.commander.views.MessageboxView;
  
  /**
   * models a dialog to set the options for the message box view.
   * @author sawielan
   *
   */
  public class MessageboxViewOptionsDialog extends Dialog {
  
  	/** the refresh time. */
  	private long refreshTime;
  	
  	/** the number of messages to be displayed. */
  	private int numberOfMessages;
  	
  	/** the message-box view. */
  	private MessageboxView mbv;
  	
  	/**
  	 * create a new options dialog. 
  	 * @param aShell Shell instance.
  	 * @param mbv a link to the surrounding message box view.
  	 */
  	public MessageboxViewOptionsDialog(Shell aShell, MessageboxView mbv) {
  		super(aShell);
  		numberOfMessages = mbv.getDisplayNumMessages();
  		refreshTime = ResourceCenter.getInstance().getMessageBoxRefresh().getRefreshTime();
  		this.mbv = mbv;
  	}
  		
  	/**
  	 * Create GUI elements in the dialog.
  	 */
  	protected Control createContents(Composite parent) {
  	
  		GridLayout layout = new GridLayout();
  		layout.numColumns = 3;
  		
  		GridData gridLabel = new GridData(GridData.FILL_BOTH);
  		gridLabel.verticalSpan = 1;
  		gridLabel.horizontalSpan = 1;
  		gridLabel.widthHint = 250;
  		gridLabel.heightHint = 20;
  		
  		GridData gridText = new GridData(GridData.FILL_BOTH);
  		gridText.verticalSpan = 1;
  		gridText.horizontalSpan = 2;
  		gridText.widthHint = 150;
  		gridText.heightHint = 20;
  		
  		parent.getShell().setLayout(layout);
  		parent.getShell().setText("Messagebox View Options");
  		
  		Label lblRefreshTime = new Label(parent, SWT.NONE);
  		lblRefreshTime.setText("Refresh Time (ms):");
  		lblRefreshTime.setLayoutData(gridLabel);
  		
  		final Text txtRefreshTime = new Text(parent, SWT.BORDER);
 		txtRefreshTime.setText(String.format("%d", getRefreshTime()));
 		txtRefreshTime.setLayoutData(gridText);
 	
 		
 		Label lblNMsg = new Label(parent, SWT.NONE);
 		lblNMsg.setText(String.format("Number of Messages (of %d):",
 				ResourceCenter.getInstance().getRepository().count(
 						mbv.getSelectedAdapter(), 
 						mbv.getSelectedReader())));
 		lblNMsg.setLayoutData(gridLabel);
 		
 		final Text txtNMsg = new Text(parent, SWT.BORDER);
 		txtNMsg.setText(String.format("%d", getNumberOfMessages()));
 		txtNMsg.setLayoutData(gridText);
 		
 		// we need to create a special grid data object for the check-box 
 		// without width-hint as otherwise the check-box will not be displayed 
 		// in *nix ...
 		GridData gridNoWidthHint = new GridData();
 		gridNoWidthHint.horizontalSpan = 3;
 		
 		final Button allMsg = new Button(parent, SWT.CHECK);
 		allMsg.setText("display all messages");
 		allMsg.setLayoutData(gridNoWidthHint);
 		allMsg.setSelection(false);
 		if (Repository.RETRIEVE_ALL == getNumberOfMessages()) {
 			allMsg.setSelection(true);
 		}
 		// add a selection listener that changes the value of the 
 		// number of messages field whenever the selection is changed.
 		allMsg.addSelectionListener(new SelectionListener() {
 			public void widgetDefaultSelected(SelectionEvent arg0) {
 				// ignore ...
 			}
 
 			public void widgetSelected(SelectionEvent arg0) {
 				if (allMsg.getSelection()) {
 					txtNMsg.setText(String.format("%d", 
 							Repository.RETRIEVE_ALL));
 				} else {
 					txtNMsg.setText(String.format("%d", 
 							ResourceCenter.GET_MAX_MESSAGES));
 				}
 			}
 			
 		});		
 		
 		final Button btnOK = new Button(parent, SWT.PUSH);
 		btnOK.setText("OK");
 		btnOK.setFocus();
 		btnOK.setLayoutData(gridLabel);
 		
 		btnOK.addSelectionListener(new SelectionAdapter() {
 		      public void widgetSelected(SelectionEvent e) {
 		        setRefreshTime(Long.parseLong(txtRefreshTime.getText()));
 		        setNumberOfMessages(Integer.parseInt(txtNMsg.getText()));
 		        
 		        setReturnCode(Window.OK);
 		        close();
 		      }
 		    });
 		
 		
 		txtRefreshTime.addListener(SWT.Modify, new Listener() {
 			public void handleEvent(Event event) {
 				try {
 					if ((txtRefreshTime.getText() == null) || (txtRefreshTime.getText().length() < 3)) {
 						btnOK.setEnabled(false);
 					} else {
 						btnOK.setEnabled(true);
 						setRefreshTime(Long.parseLong(txtRefreshTime.getText()));
 					}
 				} catch (Exception e) {
 					btnOK.setEnabled(false);
 				}
 			}
 		});
 		
 		txtNMsg.addListener(SWT.Modify, new Listener() {
 			public void handleEvent(Event event) {
 				try {
 					final int n = (new Integer(txtNMsg.getText())).intValue();
 					btnOK.setEnabled(true);
 					setNumberOfMessages(n);
 					if (Repository.RETRIEVE_ALL != n) {
 						allMsg.setSelection(false);
 					} else {
 						allMsg.setSelection(true);
 					}
 				} catch (Exception e) {
 					btnOK.setEnabled(false);
 				}
 			}
 		});
 		
 
 		
 		final Button btnCancel = new Button(parent, SWT.PUSH);
 		btnCancel.setText("Cancel");
 		btnCancel.setLayoutData(gridLabel);
 		btnCancel.addSelectionListener(new SelectionAdapter() {
 		      public void widgetSelected(SelectionEvent e) {
 		    	  setReturnCode(Window.CANCEL);
 		    	  close();
 		      }
 		    });
 		
 		parent.pack();
 		return parent;
 	}
 
 	/**
 	 * @param refreshTime the refreshTime to set
 	 */
 	public void setRefreshTime(long refreshTime) {
 		this.refreshTime = refreshTime;
 	}
 
 	/**
 	 * @return the refreshTime
 	 */
 	public long getRefreshTime() {
 		return refreshTime;
 	}
 
 	/**
 	 * @param numberOfMessages the numberOfMessages to set
 	 */
 	public void setNumberOfMessages(int numberOfMessages) {
 		this.numberOfMessages = numberOfMessages;
 	}
 
 	/**
 	 * @return the numberOfMessages
 	 */
 	public int getNumberOfMessages() {
 		return numberOfMessages;
 	}
 }