EDIT

// $Id$

/**

* Copyright (C) 2007 EDIT

* European Distributed Institute of Taxonomy 

* http://www.e-taxonomy.eu

* 

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.taxeditor.editor.description;

import java.util.ArrayList;

import java.util.List;

import org.apache.log4j.Logger;

import org.eclipse.jface.dialogs.Dialog;

import org.eclipse.jface.dialogs.IDialogConstants;

import org.eclipse.jface.dialogs.InputDialog;

import org.eclipse.jface.window.Window;

import org.eclipse.swt.SWT;

import org.eclipse.swt.custom.CCombo;

import org.eclipse.swt.events.SelectionAdapter;

import org.eclipse.swt.events.SelectionEvent;

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.Label;

import org.eclipse.swt.widgets.Shell;

import eu.etaxonomy.cdm.model.common.Language;

import eu.etaxonomy.taxeditor.editor.EditorUtil;

import eu.etaxonomy.taxeditor.store.CdmStore;

import eu.etaxonomy.taxeditor.store.model.LanguageUtil;

/**

 * @author p.ciardelli

 * @created 02.04.2009

 * @version 1.0

 */

public class LanguageDialog extends InputDialog {

	private static final Logger logger = Logger.getLogger(LanguageDialog.class);

	private static final int VISIBLE_ITEMS = 20;

	private String message;

	private Language language;

	protected Language languageTemp;

	/**

	 * Language selected last time the dialog was used.

	 */

	private static Language lastLanguage;

	private CCombo combo;

	private List<Language> languages;

	/**

	 * @param shell

	 * @param dialogTitle

	 * @param dialogMessage

	 */

	public LanguageDialog(Shell shell, String dialogTitle, String dialogMessage) {

		super(shell, dialogTitle, 

				dialogMessage, null, null);

		message = dialogMessage;

		// Set selection menu to language chosen last time Dialog was opened 

		if (lastLanguage != null)  {

			language = lastLanguage;

		}

	}

	/**

	 * Lifted from Dialog.

	 * 

	 * @param parent

	 * @return

	 * @see Dialog

	 */

	protected Control createDialogComposite(Composite parent) {

		// create a composite with standard margins and spacing

		Composite composite = new Composite(parent, SWT.NONE);

		GridLayout layout = new GridLayout();

		layout.marginHeight = convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_MARGIN);

		layout.marginWidth = convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_MARGIN);

		layout.verticalSpacing = convertVerticalDLUsToPixels(IDialogConstants.VERTICAL_SPACING);

		layout.horizontalSpacing = convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_SPACING);

		composite.setLayout(layout);

		composite.setLayoutData(new GridData(GridData.FILL_BOTH));

		applyDialogFont(composite);

		return composite;

	}

    /*

     * (non-Javadoc) Method declared on Dialog.

     */

    protected Control createDialogArea(Composite parent) {

        // create composite

        Composite composite = (Composite) createDialogComposite(parent);

        // create message

        if (message != null) {

            Label label = new Label(composite, SWT.WRAP);

            label.setText(message);

            GridData data = new GridData(GridData.GRAB_HORIZONTAL

                    | GridData.GRAB_VERTICAL | GridData.HORIZONTAL_ALIGN_FILL

                    | GridData.VERTICAL_ALIGN_CENTER);

            data.widthHint = convertHorizontalDLUsToPixels(IDialogConstants.MINIMUM_MESSAGE_AREA_WIDTH);

            label.setLayoutData(data);

            label.setFont(parent.getFont());

        }

        // create combo

        combo = new CCombo(composite, SWT.BORDER);

        combo.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL

                | GridData.HORIZONTAL_ALIGN_FILL));

        combo.setVisibleItemCount(VISIBLE_ITEMS);

        combo.addSelectionListener(new SelectionAdapter() {

			@Override

			public void widgetSelected(SelectionEvent e) {

				int i = combo.getSelectionIndex();

				languageTemp = languages.get(i);

			}

		});

        populateLanguages();

        applyDialogFont(composite);

        return composite;

    }

	/**

	 * 

	 */

	private void populateLanguages() {

		languages = new ArrayList<Language>();

		int i = 0;		

		int index = 0;

		for (Language language : CdmStore.getLanguages()) {

			String description = LanguageUtil.getDescription(language); 

			if (description == null) {

				logger.warn("No description for " + language + " - not added to language menu");

				continue;

			}

			combo.add(description);

			languages.add(language);

			if (this.language != null && this.language.equals(language)) {

				index = i;  

			}

			i++;

		}

		combo.select(index);

	}

	/**

	 * @return

	 */

	private Language getLanguage() {

		return language;

	}

	/**

	 * @param dialogTitle 

	 * @param dialogMessage 

	 * @return

	 */

	public static Language getLanguage(String dialogTitle,

			String dialogMessage) {

		LanguageDialog dialog = new LanguageDialog(EditorUtil.getShell(), 

				dialogTitle, 

				dialogMessage);

		if (dialog.open() == Window.CANCEL) {

			return null;

		}

		return dialog.getLanguage();

	}

	protected void createButtonsForButtonBar(Composite parent) {

		createButton(parent, IDialogConstants.OK_ID,

                IDialogConstants.OK_LABEL, true);

        createButton(parent, IDialogConstants.CANCEL_ID,

                IDialogConstants.CANCEL_LABEL, false);

    }

	protected void buttonPressed(int buttonId) {

		if (IDialogConstants.OK_ID == buttonId) {

			okPressed();

		} else if (IDialogConstants.CANCEL_ID == buttonId) {

			cancelPressed();

		}

	}

	protected void okPressed() {

		language = getLanguageSelection();

		lastLanguage = language;		

		super.okPressed();

	}

	protected void cancelPressed() {

		language = null;

		super.cancelPressed();

	}

	private Language getLanguageSelection() {

		int i = combo.getSelectionIndex();

		return languages.get(i);

	}

}