/*******************************************************************************
 * Copyright (c) 2004, 2011 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 - [142500] WTP properties pages fonts don't follow Eclipse preferences
 *******************************************************************************/
package org.eclipse.wst.html.ui.internal.contentproperties.ui;

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

import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceVisitor;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.swt.SWT;
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.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
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.html.core.internal.contentproperties.HTMLContentProperties;
import org.eclipse.wst.html.core.internal.document.HTMLDocumentTypeEntry;
import org.eclipse.wst.html.core.internal.document.HTMLDocumentTypeRegistry;
import org.eclipse.wst.html.ui.internal.HTMLUIMessages;
import org.eclipse.wst.html.ui.internal.Logger;
import org.eclipse.wst.html.ui.internal.editor.IHelpContextIds;

public class WebContentSettingsPropertyPage extends PropertyPage {
	private static final String SELECT_NONE = HTMLUIMessages.UI_none;
	private String maxLengthStringInHTMLDocumentTypeRegistry = ""; //$NON-NLS-1$

	private class ComboSelectionListener implements SelectionListener {
		public void widgetDefaultSelected(SelectionEvent e) {
			// do nothing
		}

		public void widgetSelected(SelectionEvent e) {
			int index = fDocumentTypeCombo.getSelectionIndex();
			String doctype = (String) fDocumentTypeIds.get(index);
			updateDoctypeText(index, doctype);
		}
	}

	Combo fDocumentTypeCombo;
	List fDocumentTypeIds;
	private Text fPublicIdText;
	private Text fSystemIdText;
	private Combo fProfileCombo;
	private List fProfileIds;
	private SelectionListener fListener;

	public WebContentSettingsPropertyPage() {
		super();
		setDescription(HTMLUIMessages.WebContentSettingsPropertyPage_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);

		createDoctypeContents(propertyPage);
		createCSSProfileContents(propertyPage);

		populateValues();
		initializeValues();
		computeMaxWidthHint();

		fListener = new ComboSelectionListener();
		fDocumentTypeCombo.addSelectionListener(fListener);

		PlatformUI.getWorkbench().getHelpSystem().setHelp(propertyPage, IHelpContextIds.WEB_CONTENT_SETTINGS_HELPID);
		Dialog.applyDialogFont(parent);
		return propertyPage;
	}

	private void createCSSProfileContents(Composite parent) {
		// CSS Profile
		Label languageLabel = new Label(parent, SWT.NONE);
		languageLabel.setText(HTMLUIMessages.UI_CSS_profile___2);
		fProfileCombo = new Combo(parent, SWT.READ_ONLY);
		GridData data = new GridData(GridData.FILL, GridData.FILL, true, false);
		data.horizontalIndent = 0;
		fProfileCombo.setLayoutData(data);
	}

	private void createDoctypeContents(Composite parent) {
		// create description of implicit DOCTYPE
		Text doctypeLabel = new Text(parent, SWT.READ_ONLY);
		doctypeLabel.setText(HTMLUIMessages.UI_Description_of_role_of_following_DOCTYPE);
		GridData data = new GridData(GridData.FILL, GridData.FILL, true, false);
		data.horizontalIndent = 0;
		data.horizontalSpan = 2;
		doctypeLabel.setLayoutData(data);

		// document type
		Label languageLabel = new Label(parent, SWT.NONE);
		languageLabel.setText(HTMLUIMessages.UI_Default_HTML_DOCTYPE_ID___1);
		fDocumentTypeCombo = new Combo(parent, SWT.READ_ONLY);
		data = new GridData(GridData.FILL, GridData.FILL, true, false);
		data.horizontalIndent = 0;
		fDocumentTypeCombo.setLayoutData(data);

		// public ID
		Label publicIdLabel = new Label(parent, SWT.NONE);
		publicIdLabel.setText(HTMLUIMessages.UI_Public_ID);
		fPublicIdText = new Text(parent, SWT.READ_ONLY | SWT.BORDER);
		data = new GridData(GridData.FILL, GridData.FILL, true, false);
		data.horizontalIndent = 0;
		fPublicIdText.setLayoutData(data);

		// system ID
		Label systemIdLabel = new Label(parent, SWT.NONE);
		systemIdLabel.setText(HTMLUIMessages.UI_System_ID);
		fSystemIdText = new Text(parent, SWT.READ_ONLY | SWT.BORDER);
		data = new GridData(GridData.FILL, GridData.FILL, true, false);
		data.horizontalIndent = 0;
		fSystemIdText.setLayoutData(data);

		// create separator
		Label label = new Label(parent, SWT.SEPARATOR | SWT.HORIZONTAL);
		data = new GridData();
		data.horizontalAlignment = GridData.FILL;
		data.horizontalSpan = 2;
		data.verticalSpan = 8;
		label.setLayoutData(data);

	}

	/**
	 * 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;
		IAdaptable adaptable = getElement();
		if (adaptable instanceof IResource) {
			resource = (IResource) adaptable;
		}
		else if (adaptable != null) {
			Object o = adaptable.getAdapter(IResource.class);
			if (o instanceof IResource) {
				resource = (IResource) o;
			}
		}
		return resource;
	}

	private String getSystemIdFrom(String publicId) {
		if (publicId == null || publicId.length() == 0)
			return null;
		HTMLDocumentTypeRegistry reg = HTMLDocumentTypeRegistry.getInstance();
		Enumeration e = reg.getEntries();
		while (e.hasMoreElements()) {
			HTMLDocumentTypeEntry entry = (HTMLDocumentTypeEntry) e.nextElement();
			if (entry.getPublicId().equals(publicId))
				return entry.getSystemId();
		}
		return null;
	}

	private void initializeValues() {
		initializeDoctypeValues();
		initializeCSSProfileValues();
	}

	private void initializeCSSProfileValues() {
		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 initializeDoctypeValues() {
		int index = 0;
		String doctype = HTMLContentProperties.getProperty(HTMLContentProperties.DOCUMENT_TYPE, getResource(), false);
		if (doctype != null) {
			/*
			 * If item is already part of combo, select it. Otherwise, select
			 * none.
			 */
			index = fDocumentTypeIds.indexOf(doctype);
		}

		// set combobox
		index = index >= 0 ? index : 0;
		fDocumentTypeCombo.select(index);

		updateDoctypeText(index, doctype);
	}

	void updateDoctypeText(int index, String doctype) {
		if (index > 0) {
			// set public/system id text
			fPublicIdText.setText(doctype);
			String systemId = getSystemIdFrom(doctype);
			if (systemId != null)
				fSystemIdText.setText(systemId);
			else
				fSystemIdText.setText(""); //$NON-NLS-1$
		}
		else {
			// set public/system id text
			fPublicIdText.setText(""); //$NON-NLS-1$
			fSystemIdText.setText(""); //$NON-NLS-1$
		}
	}

	private void populateValues() {
		populateDoctypeValues();
		populateCSSProfileValues();
	}

	private void populateCSSProfileValues() {
		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);
		}
	}

	private void populateDoctypeValues() {
		fDocumentTypeIds = new ArrayList();
		// add none first
		fDocumentTypeCombo.add(SELECT_NONE);
		fDocumentTypeIds.add(null);

		HTMLDocumentTypeRegistry reg = HTMLDocumentTypeRegistry.getInstance();
		Enumeration e = reg.getEntries();
		while (e.hasMoreElements()) {
			HTMLDocumentTypeEntry entry = (HTMLDocumentTypeEntry) e.nextElement();
			String publicId = entry.getPublicId();
			String displayName = entry.getDisplayName();
			displayName = displayName != null ? displayName : publicId;

			fDocumentTypeCombo.add(displayName);
			fDocumentTypeIds.add(publicId);

			if (displayName.length() > maxLengthStringInHTMLDocumentTypeRegistry.length()) {
				maxLengthStringInHTMLDocumentTypeRegistry = displayName;
			}

			if (entry.getSystemId() == null)
				continue; // if HTML entry


			if (entry.getSystemId().length() > maxLengthStringInHTMLDocumentTypeRegistry.length())
				maxLengthStringInHTMLDocumentTypeRegistry = entry.getSystemId();
		}
	}

	private void computeMaxWidthHint() {
		// maxLengthString was set populateDoctypeValues was called
		String maxLengthString = maxLengthStringInHTMLDocumentTypeRegistry;
		String backup = fSystemIdText.getText();
		fSystemIdText.setText(maxLengthString);
		int maxWidthHint = fSystemIdText.computeSize(SWT.DEFAULT, SWT.DEFAULT).x;
		fSystemIdText.setText(backup);

		if (fDocumentTypeCombo.getLayoutData() != null)
			((GridData) fDocumentTypeCombo.getLayoutData()).widthHint = maxWidthHint;
		if (fPublicIdText.getLayoutData() != null)
			((GridData) fPublicIdText.getLayoutData()).widthHint = maxWidthHint;
		if (fSystemIdText.getLayoutData() != null)
			((GridData) fSystemIdText.getLayoutData()).widthHint = maxWidthHint;
		if (fProfileCombo.getLayoutData() != null)
			((GridData) fProfileCombo.getLayoutData()).widthHint = maxWidthHint;
	}

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

		super.performDefaults();
	}

	private boolean performCSSProfileOk() {
		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 false;
			}
		}
		return true;
	}

	protected void performDefaults() {
		super.performDefaults();

		performDoctypeDefaults();
		performCSSProfileDefaults();
	}

	private void performDoctypeDefaults() {
		fPublicIdText.setText("");//$NON-NLS-1$
		fSystemIdText.setText(""); //$NON-NLS-1$
		int index = fDocumentTypeCombo.indexOf(SELECT_NONE);
		if (index > -1)
			fDocumentTypeCombo.select(index);
	}

	private boolean performDoctypeOk() {
		int index = fDocumentTypeCombo.getSelectionIndex();
		if (index > -1) {
			String id = (String) fDocumentTypeIds.get(index);
			if (id == null || id.equalsIgnoreCase(SELECT_NONE)) {
				// if none, use null
				id = null;
			}
			try {
				HTMLContentProperties.setProperty(HTMLContentProperties.DOCUMENT_TYPE, 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 false;
			}
		}
		return true;
	}

	public boolean performOk() {
		if (performDoctypeOk() || performCSSProfileOk()) {
			// touch to mark for build-driven revalidation
			IResource resource = getResource();
			if (resource != null) {
				try {
					resource.accept(new IResourceVisitor() {

						public boolean visit(IResource resource) throws CoreException {
							try {
								resource.touch(null);
							}
							catch (CoreException e) {
								return false;
							}
							return true;
						}
					}, IResource.DEPTH_INFINITE, false);
				}
				catch (CoreException e) {
					Logger.logException(e);
				}
			}
		}

		return super.performOk();
	}
}