/*******************************************************************************
 * Copyright (c) 2003, 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     David Schneider, david.schneider@unisys.com - bug 142500
 *     Kiril Mitov, k.mitov@sap.com	- bug 204160
 *     Kaloyan Raev, kaloyan.raev@sap.com
 *******************************************************************************/
package org.eclipse.jst.servlet.ui.internal.wizard;

import static org.eclipse.jst.j2ee.web.IServletConstants.QUALIFIED_SERVLET;

import java.util.Iterator;

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jst.j2ee.internal.web.operations.INewServletClassDataModelProperties;
import org.eclipse.jst.j2ee.internal.web.operations.ServletSupertypesValidator;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.KeyListener;
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.wst.common.frameworks.datamodel.IDataModel;

public class NewServletClassOptionsWizardPage extends
		NewWebClassOptionsWizardPage implements ISelectionChangedListener {
	
	protected Button initButton;
	protected Button destroyButton;
	protected Button getConfigButton;
	protected Button getInfoButton;
	protected Button serviceButton;
	protected Button doGetButton;
	protected Button doPostButton;
	protected Button doPutButton;
	protected Button doDeleteButton;
	protected Button doHeadButton;
	protected Button doOptionsButton;
	protected Button doTraceButton;
	
	public NewServletClassOptionsWizardPage(IDataModel model, String pageName, String pageDesc, String pageTitle) {
		super(model, pageName, pageDesc, pageTitle);
	}
	
	@Override
	protected void enter() {
		super.enter();
		
		boolean httpServlet = ServletSupertypesValidator.isHttpServletSuperclass(model);
		doGetButton.setVisible(httpServlet);
		doPostButton.setVisible(httpServlet);
		doPutButton.setVisible(httpServlet);
		doDeleteButton.setVisible(httpServlet);
		doHeadButton.setVisible(httpServlet);
		doOptionsButton.setVisible(httpServlet);
		doTraceButton.setVisible(httpServlet);
	}
	
	/**
	 * Create the composite with all the stubs
	 */
	@Override
	protected void createStubsComposite(Composite parent) {
		super.createStubsComposite(parent);
		
		inheritButton.addSelectionListener(new SelectionListener() {
			public void widgetSelected(SelectionEvent e) {
				boolean enable = inheritButton.getSelection();
				enableGenericServletButtons(enable);
				enableHttpServletButtons(enable);
			}
			
			public void widgetDefaultSelected(SelectionEvent e) {
				//Do nothing
			}
			
			private void enableGenericServletButtons(boolean enable) {
				if (ServletSupertypesValidator.isGenericServletSuperclass(model)) {
					initButton.setEnabled(enable);
					destroyButton.setEnabled(enable);
					getConfigButton.setEnabled(enable);
					getInfoButton.setEnabled(enable);
					serviceButton.setEnabled(enable);
				}
			}
			
			private void enableHttpServletButtons(boolean enable) {
				doGetButton.setEnabled(enable);
				doPostButton.setEnabled(enable);
				doPutButton.setEnabled(enable);
				doDeleteButton.setEnabled(enable);
				doHeadButton.setEnabled(enable);
				doOptionsButton.setEnabled(enable);
				doTraceButton.setEnabled(enable);
			}
		});
		
		Composite comp = new Composite(methodStubs, SWT.NULL);
		GridLayout layout = new GridLayout(3, false);
		layout.marginWidth = 0;
		layout.makeColumnsEqualWidth = true;
		comp.setLayout(layout);
		GridData data = new GridData(GridData.FILL_BOTH);
		comp.setLayoutData(data);
		
		initButton = new Button(comp, SWT.CHECK);
		initButton.setText("&init"); //$NON-NLS-1$
		synchHelper.synchCheckbox(initButton, INewServletClassDataModelProperties.INIT, null);

		destroyButton = new Button(comp, SWT.CHECK);
		destroyButton.setText("destro&y"); //$NON-NLS-1$
		synchHelper.synchCheckbox(destroyButton, INewServletClassDataModelProperties.DESTROY, null);

		getConfigButton = new Button(comp, SWT.CHECK);
		getConfigButton.setText("getServlet&Config"); //$NON-NLS-1$
		synchHelper.synchCheckbox(getConfigButton, INewServletClassDataModelProperties.GET_SERVLET_CONFIG, null);

		getInfoButton = new Button(comp, SWT.CHECK);
		getInfoButton.setText("getServletI&nfo"); //$NON-NLS-1$
		synchHelper.synchCheckbox(getInfoButton, INewServletClassDataModelProperties.GET_SERVLET_INFO, null);
		
		serviceButton = new Button(comp, SWT.CHECK);
		serviceButton.setText("&service"); //$NON-NLS-1$
		synchHelper.synchCheckbox(serviceButton, INewServletClassDataModelProperties.SERVICE, null);
		
		doGetButton = new Button(comp, SWT.CHECK);
		doGetButton.setText("do&Get"); //$NON-NLS-1$
		synchHelper.synchCheckbox(doGetButton, INewServletClassDataModelProperties.DO_GET, null);

		doPostButton = new Button(comp, SWT.CHECK);
		doPostButton.setText("do&Post"); //$NON-NLS-1$
		synchHelper.synchCheckbox(doPostButton, INewServletClassDataModelProperties.DO_POST, null);

		doPutButton = new Button(comp, SWT.CHECK);
		doPutButton.setText("doP&ut"); //$NON-NLS-1$
		synchHelper.synchCheckbox(doPutButton, INewServletClassDataModelProperties.DO_PUT, null);

		doDeleteButton = new Button(comp, SWT.CHECK);
		doDeleteButton.setText("do&Delete"); //$NON-NLS-1$
		synchHelper.synchCheckbox(doDeleteButton, INewServletClassDataModelProperties.DO_DELETE, null);

		doHeadButton = new Button(comp, SWT.CHECK);
		doHeadButton.setText("do&Head"); //$NON-NLS-1$
		synchHelper.synchCheckbox(doHeadButton, INewServletClassDataModelProperties.DO_HEAD, null);

		doOptionsButton = new Button(comp, SWT.CHECK);
		doOptionsButton.setText("do&Options"); //$NON-NLS-1$
		synchHelper.synchCheckbox(doOptionsButton, INewServletClassDataModelProperties.DO_OPTIONS, null);

		doTraceButton = new Button(comp, SWT.CHECK);
		doTraceButton.setText("do&Trace"); //$NON-NLS-1$
		synchHelper.synchCheckbox(doTraceButton, INewServletClassDataModelProperties.DO_TRACE, null);
		
		interfaceViewer.addSelectionChangedListener(this);
		
	    Dialog.applyDialogFont(parent);
	}

	public void selectionChanged(SelectionChangedEvent event) {
		IStructuredSelection selection = (IStructuredSelection) event.getSelection();
		removeButton.setEnabled(canRemoveSelectedInterfaces(selection));
	}
	
	protected KeyListener getInterfaceKeyListener() {
		return new KeyListener() {

			public void keyPressed(KeyEvent e) {
			}

			public void keyReleased(KeyEvent e) {
				if (e.keyCode == SWT.DEL) {
					IStructuredSelection selection = (IStructuredSelection) interfaceViewer.getSelection();
					if (canRemoveSelectedInterfaces(selection)) {
						handleInterfaceRemoveButtonSelected();
					}
				}
			}
			
		};
	}
	
	private boolean canRemoveSelectedInterfaces(IStructuredSelection selection) {
		// if the selection is empty, then remove is not possible
		if (selection.isEmpty()) {
			return false;
		}
		
		// if the selection is non-empty and the servlet extends GenericServlet, then
		// remove is possible 
		if (ServletSupertypesValidator.isGenericServletSuperclass(model)) {
			return true;
		} 
		
		// if the selection is non-empty and the servlet does not extend GenericServlet, 
		// then remove is not possible only if the Servlet interface is in the selection
		Iterator iter = selection.iterator();
		while (iter.hasNext()) {
			if (QUALIFIED_SERVLET.equals(iter.next())) {
				return false;
			}
		}

		// in all other cases remove is possible
		return true;
	}
}