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.navigation.search;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.FocusEvent;

import org.eclipse.swt.events.FocusListener;

import org.eclipse.swt.events.KeyAdapter;

import org.eclipse.swt.events.KeyEvent;

import org.eclipse.swt.events.SelectionAdapter;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.graphics.Point;

import org.eclipse.swt.graphics.Rectangle;

import org.eclipse.swt.layout.RowLayout;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Control;

import org.eclipse.swt.widgets.Menu;

import org.eclipse.swt.widgets.MenuItem;

import org.eclipse.swt.widgets.Text;

import org.eclipse.swt.widgets.ToolBar;

import org.eclipse.swt.widgets.ToolItem;

import org.eclipse.ui.IViewPart;

import org.eclipse.ui.IWorkbenchPage;

import org.eclipse.ui.PartInitException;

import org.eclipse.ui.PlatformUI;

import org.eclipse.ui.menus.WorkbenchWindowControlContribution;

import org.eclipse.ui.swt.IFocusService;

import eu.etaxonomy.cdm.api.service.config.ITaxonServiceConfigurator;

import eu.etaxonomy.taxeditor.navigation.NavigationUtil;

import eu.etaxonomy.taxeditor.navigation.internal.TaxeditorNavigationPlugin;

import eu.etaxonomy.taxeditor.preference.PreferencesUtil;

import eu.etaxonomy.taxeditor.preference.Resources;

/**

 * <p>SearchBar class.</p>

 *

 * @author n.hoffmann

 * @author e.-m.lee

 * @created 15.04.2009

 * @version 1.0

 */

public class SearchBar extends WorkbenchWindowControlContribution{

	private Text text_search;

	private String srv;

	private String defaultText = "Use \"*\" for wildcard searching";

	final private ConfigurationSelectionListener configurationListener = new ConfigurationSelectionListener();

	/** {@inheritDoc} */

	@Override

	protected Control createControl(Composite parent) {

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

		createLayout(composite);

		createSearchTextField(composite);

		createToolBar(composite);

		registerAtFocusService();

		return composite;

	}

	/**

	 * Handles focus changes for the search textfield.

	 */

	private void registerAtFocusService() {

		IFocusService focusService = 

			(IFocusService) PlatformUI.getWorkbench().getService(IFocusService.class);

		if (focusService != null) {

			focusService.addFocusTracker(text_search, "navigation.textControlId");

		}

	}

	/**

	 * Creates the search toolbar.

	 * @param composite

	 */

	private void createToolBar(Composite composite) {

		final ToolBar toolBar = new ToolBar(composite, SWT.NULL);

		ToolItem toolItem = new ToolItem(toolBar, SWT.DROP_DOWN | SWT.BORDER);

		toolItem.setText("Search");

		DropdownSelectionListener dropdownListener = new DropdownSelectionListener(

				toolItem);

		for(SearchOption searchOption : SearchOption.values()){

			dropdownListener.add(searchOption);

		}

		toolItem.addSelectionListener(dropdownListener);

	}

	/**

	 * Creates the search textfield.

	 * @param composite

	 */

	private void createSearchTextField(Composite composite) {

		// TODO for some reason the text_search composite has a margin when

		// either SWT.BORDER or SWT.SEARCH

		// is applied. I am not sure how to get rid of this.

		text_search = new Text(composite, SWT.BORDER | SWT.SINGLE

				| SWT.FULL_SELECTION);

		text_search.setForeground(NavigationUtil.getColor(Resources.SEARCH_VIEW_FOREGROUND));

		text_search.setText(defaultText);

		addTextListeners();

	}

	/**

	 * Adds listeners to the search textfield.

	 */

	private void addTextListeners() {

		text_search.addFocusListener(new FocusListener() {

			public void focusGained(FocusEvent e) {

				text_search.setForeground(NavigationUtil.getColor(Resources.SEARCH_VIEW_FOCUS));

				if (defaultText.equals(text_search.getText())) {

					text_search.setText("");

				}

			}

			public void focusLost(FocusEvent e) {

				if (text_search.getText() == "") {

					text_search.setForeground(NavigationUtil.getColor(Resources.SEARCH_VIEW_FOREGROUND));

					text_search.setText(defaultText);

				}

			}

		});

		text_search.addKeyListener(new KeyAdapter() {

			/*

			 * (non-Javadoc)

			 * @see org.eclipse.swt.events.KeyAdapter#keyPressed(org.eclipse.swt.events.KeyEvent)

			 */

			@Override

			public void keyPressed(KeyEvent e) {

				if (e.keyCode == SWT.CR) {

					search();

				}

			}

		});

	}

	/**

	 * Creates the search layout.

	 * @param composite

	 */

	private void createLayout(Composite composite) {

		final RowLayout layout = new RowLayout();

		layout.wrap = false;

		layout.pack = true;

		layout.justify = true;

		layout.type = SWT.HORIZONTAL;

		layout.marginLeft = 0;

		layout.marginTop = 0;

		layout.marginRight = 0;

		layout.marginBottom = 0;

		layout.spacing = 0;

		composite.setLayout(layout);

	}

	private void search(){

		final String searchString = getSearchString();

		if(searchString == null){

			return;

		}

		if("*".equals(searchString.trim())){

			NavigationUtil.warningDialog("Could not execute search", this, "Please type at least one character when using the \"*\" wildcard.");

			return;

		}

		ITaxonServiceConfigurator configurator = configurationListener.getConfigurator();

		configurator.setSearchString(searchString);

		openSearchResultsView(configurator);

	}

	private String getSearchString(){

		String searchString = text_search.getText().trim();

		if (searchString.equals(defaultText) || searchString.length() == 0)

			return null;

		return searchString;

	}

	/**

	 * Opens a new instance of the search result view to display the result to the user.

	 * 

	 * @param searchResult

	 */

	private void openSearchResultsView(ITaxonServiceConfigurator configurator) {

		// This variable is needed to address new instances of the view.

		srv += "1";

		try {

			IViewPart resultsView = TaxeditorNavigationPlugin.getDefault()

					.getWorkbench().getActiveWorkbenchWindow()

					.getActivePage().showView(SearchResultView.ID, srv,

							IWorkbenchPage.VIEW_ACTIVATE);

			((SearchResultView) resultsView).performSearch(configurator);

		} catch (PartInitException e) {

			NavigationUtil.error(this.getClass(), "Error opening search result.", e);

		}

	}

	/**

	 * Handles drop down menu selection. Available items are defined in the enumeration SearchOption.

	 * 

	 * @author n.hoffmann

	 * @created Feb 2, 2010

	 * @version 1.0

	 */

	class DropdownSelectionListener extends SelectionAdapter {

		private Menu menu;

		public DropdownSelectionListener(ToolItem dropdown) {

			menu = new Menu(dropdown.getParent().getShell());

		}

		public void add(SearchOption option) {

			MenuItem menuItem = new MenuItem(menu, SWT.CHECK);

			menuItem.setData(option);

			menuItem.setText(option.getLabel());

			menuItem.setSelection(option.getPreference());

			menuItem.addSelectionListener(configurationListener);

		}

		public void widgetSelected(SelectionEvent event) {

			if (event.detail == SWT.ARROW) {

				ToolItem item = (ToolItem) event.widget;

				Rectangle rect = item.getBounds();

				Point pt = item.getParent().toDisplay(new Point(rect.x, rect.y));

				menu.setLocation(pt.x, pt.y + rect.height);

				menu.setVisible(true);

			} else {

				search();

			}

		}

	}

	/**

	 * Handles search configuration selection.

	 * 

	 * @author n.hoffmann

	 * @created Feb 2, 2010

	 * @version 1.0

	 */

	class ConfigurationSelectionListener extends SelectionAdapter {

		private ITaxonServiceConfigurator configurator = PreferencesUtil.getSearchConfigurator();

		/*

		 * (non-Javadoc)

		 * 

		 * @see

		 * org.eclipse.swt.events.SelectionListener#widgetSelected(org.eclipse

		 * .swt.events.SelectionEvent)

		 */

		public void widgetSelected(SelectionEvent e) {

			NavigationUtil.info("configuration menu clicked");

			SearchOption option = (SearchOption) e.widget.getData();

			switch (option){

			case TAXON:

				configurator.setDoTaxa(configurator.isDoTaxa() ? false : true);

				break;

			case SYNONYM:

				configurator.setDoSynonyms(configurator.isDoSynonyms() ? false : true);

				break;

			case NAME:

				configurator.setDoNamesWithoutTaxa(configurator.isDoNamesWithoutTaxa() ? false : true);

				break;

			case COMMON_NAME:

				configurator.setDoTaxaByCommonNames(getConfigurator().isDoTaxaByCommonNames() ? false : true);

				break;				

			}

			saveConfigurator();

		}

		public ITaxonServiceConfigurator getConfigurator() {

			return configurator;

		}

		private void saveConfigurator() {

			PreferencesUtil.setSearchConfigurator(getConfigurator());

			this.configurator = PreferencesUtil.getSearchConfigurator();

		}

	}

	/**

	 * Available search options.

	 * 

	 * @author n.hoffmann

	 * @created Feb 2, 2010

	 * @version 1.0

	 */

	enum SearchOption {

		TAXON("Taxa"), 

		SYNONYM("Synonyms"), 

		NAME("Names (without taxa)"), 

		COMMON_NAME("Common Names");

		private String label;

		private SearchOption(String label) {

			this.label = label;

		}

		public String getLabel() {

			return label;

		}

		public boolean getPreference() {

			if (!PreferencesUtil.getPreferenceStore().contains(

					PreferencesUtil.TAXON_SERVICE_CONFIGURATOR_TAXA)) {

				// initializes the search configurator

				PreferencesUtil.initializeSearchConfigurator();

			}

			switch (this) {

			case TAXON:

				boolean result = PreferencesUtil.getPreferenceStore().getBoolean(

								PreferencesUtil.TAXON_SERVICE_CONFIGURATOR_TAXA);

				return result;

			case SYNONYM:

				return PreferencesUtil.getPreferenceStore().getBoolean(

						PreferencesUtil.TAXON_SERVICE_CONFIGURATOR_SYNONYMS);

			case NAME:

				return PreferencesUtil.getPreferenceStore().getBoolean(

						PreferencesUtil.TAXON_SERVICE_CONFIGURATOR_NAMES);

			case COMMON_NAME:

				return PreferencesUtil.getPreferenceStore().getBoolean(

								PreferencesUtil.TAXON_SERVICE_CONFIGURATOR_COMMON_NAMES);

			}

			return true;

		}

	}

}