/*******************************************************************************
 * Copyright (c) 2007-2009 Red Hat, Inc.
 * Distributed under license by Red Hat, Inc. All rights reserved.
 * This program is 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
 *
 * Contributor:
 *     Red Hat, Inc. - initial API and implementation
 ******************************************************************************/

package org.jboss.tools.jst.jsp.outline.cssdialog;

import java.util.Map;

import org.eclipse.core.databinding.AggregateValidationStatus;
import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.observable.ChangeEvent;
import org.eclipse.core.databinding.observable.IChangeListener;
import org.eclipse.core.databinding.observable.IObservable;
import org.eclipse.core.databinding.observable.value.IValueChangeListener;
import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.dialogs.TitleAreaDialog;
import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.custom.SashForm;
import org.eclipse.swt.events.FocusAdapter;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
import org.jboss.tools.common.model.ui.widgets.Split;
import org.jboss.tools.jst.jsp.messages.JstUIMessages;
import org.jboss.tools.jst.jsp.outline.cssdialog.common.Constants;
import org.jboss.tools.jst.jsp.outline.cssdialog.common.StyleAttributes;

/**
 * @author Sergey Dzmitrovich
 * 
 */
public abstract class AbstractCSSDialog extends TitleAreaDialog {

	private Browser browser;

	private Text previewText;

	private String previewContent;

	private StyleAttributes styleAttributes;

	private StyleComposite styleComposite;

	private DataBindingContext bindingContext = new DataBindingContext();
	
	private AggregateValidationStatus aggregateStatus;

	private IStatus status = Status.OK_STATUS;

	final public static int DEFAULT_DIALOG_WIDTH = 500;
	final public static int DEFAULT_DIALOG_HEIGHT = 500;
	final public static int DEFAULT_BROWTHER_WEIGHT = 15;
	final public static int DEFAULT_CONTROLS_WEIGHT = 85;

	/**
	 * 
	 */
	public AbstractCSSDialog(Shell shell) {
		super(shell);

		previewContent = JstUIMessages.DEFAULT_TEXT_FOR_BROWSER_PREVIEW;
		styleAttributes = new StyleAttributes();
	}

	@Override
	protected Control createDialogArea(Composite parent) {

		Composite parentComposite = (Composite) super.createDialogArea(parent);
		GridData gridData = (GridData) parentComposite.getLayoutData();
		gridData.heightHint = DEFAULT_DIALOG_HEIGHT;
		gridData.widthHint = DEFAULT_DIALOG_WIDTH;

		createControlPane(parentComposite);

		return parentComposite;
	}

	public Composite createControlPane(Composite parent) {

		// Create split component that separates dialog on 2 parts
		Split dialogContainer = new Split(parent, SWT.VERTICAL);

		createBrowserComposite(dialogContainer);
		createControlComposite(dialogContainer);

		dialogContainer.setWeights(new int[] { DEFAULT_BROWTHER_WEIGHT,
				DEFAULT_CONTROLS_WEIGHT });
		dialogContainer.setLayoutData(new GridData(GridData.FILL,
				GridData.BEGINNING, true, true));

		getStyleAttributes().addChangeListener(new IChangeListener() {

			public void handleChange(ChangeEvent event) {
				handleStyleChanged();

			}

		});

		aggregateStatus = new AggregateValidationStatus(
				getBindingContext().getValidationStatusProviders(),
				AggregateValidationStatus.MAX_SEVERITY);
		aggregateStatus.addValueChangeListener(new IValueChangeListener() {
			public void handleValueChange(ValueChangeEvent event) {

				handleStatusChanged((IStatus) event.diff.getNewValue());
			}
		});

		return dialogContainer;
	}

	protected Composite createControlComposite(Composite parent) {

		// Create down splitter container
		Composite controlsContainer = new Composite(parent, SWT.None);
		controlsContainer.setLayout(new GridLayout());
		controlsContainer.setLayoutData(new GridData(GridData.FILL,
				GridData.FILL, true, true));

		createExtensionComposite(controlsContainer);
		styleComposite = createStyleComposite(controlsContainer);

		return controlsContainer;

	}

	protected void createExtensionComposite(Composite parent) {

	}

	/**
	 * 
	 * @param parent
	 */
	protected Composite createBrowserComposite(final Composite parent) {

		final SashForm previewComposite = new SashForm(parent, SWT.None);
		previewComposite.setLayout(new GridLayout());
		GridData gridData = new GridData(GridData.FILL, GridData.FILL, true,
				true);
		previewComposite.setLayoutData(gridData);

		browser = new Browser(previewComposite, SWT.BORDER | SWT.MOZILLA);
		browser.setText(generateBrowserPage());
		browser.setLayoutData(gridData);
		browser.addMouseListener(new MouseAdapter() {
			public void mouseDoubleClick(MouseEvent e) {
				if (e.widget == browser) {
					browser.setEnabled(false);
					previewComposite.setMaximizedControl(previewText);
					previewText.setFocus();
				}
			}
		});

		previewText = new Text(previewComposite, SWT.NONE | SWT.H_SCROLL);
		previewText.setLayoutData(gridData);
		previewText.setText(getPreviewContent());
		previewText.addFocusListener(new FocusAdapter() {
			public void focusLost(FocusEvent e) {
				if (e.widget == previewText) {
					String text = previewText.getText();
					if (text == null || text.equals(Constants.EMPTY)) {
						setPreviewContent(JstUIMessages.DEFAULT_TEXT_FOR_BROWSER_PREVIEW);
					} else {
						setPreviewContent(text);
					}

					browser.setEnabled(true);
					browser.setText(generateBrowserPage());
					previewComposite.setMaximizedControl(browser);
				}
			}
		});

		previewComposite.setMaximizedControl(browser);
		return previewComposite;
	}

	protected StyleComposite createStyleComposite(Composite parent) {
		return new StyleComposite(parent, getStyleAttributes(),
				getBindingContext());
	}

	protected void handleStyleChanged() {
		browser.setText(generateBrowserPage());
	}

	protected void handleStatusChanged(IStatus newStatus) {
		if (newStatus.isOK() && !status.isOK()) {
			setErrorMessage(null);
		} else if (newStatus.getSeverity() == IStatus.ERROR) {
			setErrorMessage(newStatus.getMessage());
		}
		if (newStatus.getSeverity() != status.getSeverity()) {
			getButton(OK).setEnabled(newStatus.isOK());
		}

		status = newStatus;
	}

	public IStatus getStatus() {
		return status;
	}

	/**
	 * /** Method is used to build html body that is appropriate to browse.
	 * 
	 * @return String html text representation
	 */
	public String generateBrowserPage() {
		StringBuffer html = new StringBuffer(Constants.OPEN_DIV_TAG);

		for (Map.Entry<String, String> styleItem : getStyleAttributes()
				.entrySet()) {

			html.append(styleItem.getKey() + Constants.COLON
					+ styleItem.getValue() + Constants.SEMICOLON);
		}

		html.append("\">" + getPreviewContent() + Constants.CLOSE_DIV_TAG); //$NON-NLS-1$

		return html.toString();
	}
	
	public void releaseResources() {
		aggregateStatus.dispose();
	}

	@Override
	public boolean close() {
		releaseResources();
		return super.close();
	}

	public Browser getBrowser() {
		return browser;
	}

	public StyleAttributes getStyleAttributes() {
		return styleAttributes;
	}

	public String getPreviewContent() {
		return previewContent;
	}

	public void setPreviewContent(String previewContent) {
		this.previewContent = previewContent;
	}

	public DataBindingContext getBindingContext() {
		return bindingContext;
	}

	public StyleComposite getStyleComposite() {
		return styleComposite;
	}

	public void setStatus(IStatus status) {
		this.status = status;
	}

}
