/*****************************************************************************
 * Copyright (c) 2004 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
 ****************************************************************************/
package org.eclipse.wst.css.ui.internal.contentproperties.ui;


import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.dialogs.PropertyPage;
import org.eclipse.wst.css.core.internal.contentproperties.CSSContentProperties;
import org.eclipse.wst.css.core.internal.metamodel.CSSProfile;
import org.eclipse.wst.css.core.internal.metamodel.CSSProfileRegistry;
import org.eclipse.wst.css.ui.internal.CSSUIMessages;
import org.eclipse.wst.css.ui.internal.Logger;
import org.eclipse.wst.css.ui.internal.editor.IHelpContextIds;

public final class CSSWebContentSettingsPropertyPage extends PropertyPage {
	private static final String SELECT_NONE = CSSUIMessages.UI_none;

	private Combo fProfileCombo;
	private List fProfileIds;

	public CSSWebContentSettingsPropertyPage() {
		super();
		setDescription(CSSUIMessages.CSSContentSettingsPropertyPage_0);
	}

	private Composite createComposite(Composite parent, int numColumns) {
		Composite composite = new Composite(parent, SWT.NULL);

		// GridLayout
		GridLayout layout = new GridLayout();
		layout.numColumns = numColumns;
		composite.setLayout(layout);

		// GridData
		GridData data = new GridData(GridData.FILL, GridData.FILL, true, false);
		data.horizontalIndent = 0;
		composite.setLayoutData(data);

		return composite;
	}

	protected Control createContents(Composite parent) {
		Composite propertyPage = createComposite(parent, 2);

		// CSS Profile control
		Text languageLabel = new Text(propertyPage, SWT.READ_ONLY);
		languageLabel.setText(CSSUIMessages.CSSContentSettingsPropertyPage_1);
		fProfileCombo = new Combo(propertyPage, SWT.READ_ONLY);
		GridData data = new GridData(GridData.FILL, GridData.FILL, true, false);
		data.horizontalIndent = 0;
		fProfileCombo.setLayoutData(data);

		populateValues();
		initializeValues();

		PlatformUI.getWorkbench().getHelpSystem().setHelp(propertyPage, IHelpContextIds.CSS_CONTENT_SETTINGS_HELPID);
		return propertyPage;
	}

	/**
	 * Get the resource this properties page is for
	 * 
	 * @return IResource for this properties page or null if there is no
	 *         IResource
	 */
	private IResource getResource() {
		IResource resource = null;
		if (getElement() instanceof IResource) {
			resource = (IResource) getElement();
		}
		return resource;
	}

	private void initializeValues() {
		int index = 0;
		String profile = CSSContentProperties.getProperty(CSSContentProperties.CSS_PROFILE, getResource(), false);
		if (profile != null && profile.length() > 0) {
			/*
			 * If item is already part of combo, select it. Otherwise, select
			 * none.
			 */
			index = fProfileIds.indexOf(profile);
		}
		index = index >= 0 ? index : 0;
		fProfileCombo.select(index);
	}

	private void populateValues() {
		fProfileIds = new ArrayList();
		// add none first
		fProfileCombo.add(SELECT_NONE);
		fProfileIds.add(null);

		CSSProfileRegistry reg = CSSProfileRegistry.getInstance();
		Iterator i = reg.getProfiles();
		while (i.hasNext()) {
			CSSProfile profile = (CSSProfile) i.next();
			String id = profile.getProfileID();
			String name = profile.getProfileName();
			fProfileCombo.add(name);
			fProfileIds.add(id);
		}
	}

	protected void performDefaults() {
		int index = fProfileCombo.indexOf(SELECT_NONE);
		if (index > -1)
			fProfileCombo.select(index);

		super.performDefaults();
	}

	public boolean performOk() {
		int index = fProfileCombo.getSelectionIndex();
		if (index > -1) {
			String id = (String) fProfileIds.get(index);
			if (id == null || id.length() == 0 || id.equalsIgnoreCase(SELECT_NONE)) {
				// if none, use null
				id = null;
			}
			try {
				CSSContentProperties.setProperty(CSSContentProperties.CSS_PROFILE, getResource(), id);
			}
			catch (CoreException e) {
				// maybe in future, let user know there was a problem saving
				// file
				Logger.log(Logger.WARNING_DEBUG, e.getMessage(), e);
			}
		}
		return super.performOk();
	}
}