/*

 * Copyright (C) 2011 Openismus GmbH

 *

 * This file is part of GWT-Glom.

 *

 * GWT-Glom is free software: you can redistribute it and/or modify it

 * under the terms of the GNU Lesser General Public License as published by the

 * Free Software Foundation, either version 3 of the License, or (at your

 * option) any later version.

 *

 * GWT-Glom is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License

 * for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with GWT-Glom.  If not, see <http://www.gnu.org/licenses/>.

 */

package org.glom.web.client.activity;

import org.glom.web.client.StringUtils;

import org.glom.web.client.ClientFactory;

import org.glom.web.client.OnlineGlomServiceAsync;

import org.glom.web.client.Utils;

import org.glom.web.client.event.LocaleChangeEvent;

import org.glom.web.client.event.QuickFindChangeEvent;

import org.glom.web.client.event.TableChangeEvent;

import org.glom.web.client.place.DetailsPlace;

import org.glom.web.client.place.HasSelectableTablePlace;

import org.glom.web.client.place.ListPlace;

import org.glom.web.client.ui.TableSelectionView;

import org.glom.web.client.ui.View;

import org.glom.web.shared.DocumentInfo;

import com.google.gwt.activity.shared.AbstractActivity;

import com.google.gwt.core.client.GWT;

import com.google.gwt.event.dom.client.ChangeEvent;

import com.google.gwt.event.dom.client.ChangeHandler;

import com.google.gwt.event.dom.client.HasChangeHandlers;

import com.google.gwt.event.shared.EventBus;

import com.google.gwt.event.shared.HandlerRegistration;

import com.google.gwt.i18n.client.LocaleInfo;

import com.google.gwt.place.shared.Place;

import com.google.gwt.user.client.Window;

import com.google.gwt.user.client.rpc.AsyncCallback;

import com.google.gwt.user.client.ui.AcceptsOneWidget;

/**

 *

 */

public class TableSelectionActivity extends AbstractActivity implements View.Presenter {

	private final ClientFactory clientFactory;

	private String documentID;

	private String documentTitle;

	private String tableName;

	private String quickFind;

	private HandlerRegistration tableChangeHandlerRegistration = null;

	private HandlerRegistration quickFindChangeHandlerRegistration = null;

	private HandlerRegistration localeChangeHandlerRegistration = null;

	// This activity isn't properly configured until the List or Details Place is set with the appropriate methods

	public TableSelectionActivity(final ClientFactory clientFactory) {

		this.clientFactory = clientFactory;

	}

	/**

	 * Invoked by the ActivityManager to start a new Activity

	 */

	@Override

	public void start(final AcceptsOneWidget containerWidget, final EventBus eventBus) {

		final TableSelectionView tableSelectionView = clientFactory.getTableSelectionView();

		tableSelectionView.setPresenter(this);

		// For table changes with the tableSelector:

		final HasChangeHandlers tableSelector = tableSelectionView.getTableSelector();

		tableChangeHandlerRegistration = tableSelector.addChangeHandler(new ChangeHandler() {

			@Override

			public void onChange(final ChangeEvent event) {

				// Fire a table change event so that other views (e.g. the details view) know about the change and can

				// update themselves.

				eventBus.fireEvent(new TableChangeEvent(tableSelectionView.getSelectedTableName()));

				// Update the browser title because there's place change and the setPlace() method will not be called.

				Window.setTitle(documentTitle + ": " + tableSelectionView.getSelectedTableTitle());

			}

		});

		// For quick find changes with the quick find box:

		final HasChangeHandlers quickFindBox = tableSelectionView.getQuickFindBox();

		quickFindChangeHandlerRegistration = quickFindBox.addChangeHandler(new ChangeHandler() {

			@Override

			public void onChange(final ChangeEvent event) {

				// Fire a quickfind change event so that other views (e.g. the details view) know about the change and

				// can

				// update themselves.

				eventBus.fireEvent(new QuickFindChangeEvent(tableSelectionView.getQuickFindText()));

				// Update the browser title because there's place change and the setPlace() method will not be called.

				// TODO? Window.setTitle(documentTitle + ": " + tableSelectionView.getSelectedTableTitle());

			}

		});

		// For locale changes with the localeSelector:

		final HasChangeHandlers localeSelector = tableSelectionView.getLocaleSelector();

		localeChangeHandlerRegistration = localeSelector.addChangeHandler(new ChangeHandler() {

			@Override

			public void onChange(final ChangeEvent event) {

				// Show the translated version of the document title and the table names:

				final String localeID = tableSelectionView.getSelectedLocale();

				fillView(tableSelectionView);

				final String newURL = Window.Location.createUrlBuilder().setParameter(LocaleInfo.getLocaleQueryParam(), localeID).buildString();

				Window.Location.assign(newURL);

				// Fire a locale change event so that other views (e.g. the details view) know about the change and can

				// update themselves.

				eventBus.fireEvent(new LocaleChangeEvent(localeID));

			}

		});

		fillView(tableSelectionView);

		// we're done, set the widget

		containerWidget.setWidget(tableSelectionView.asWidget());

	}

	private void fillView(final TableSelectionView tableSelectionView) {

		// get the table names, table titles and default table index for the current document

		final AsyncCallback<DocumentInfo> callback = new AsyncCallback<DocumentInfo>() {

			@Override

			public void onFailure(final Throwable caught) {

				// TODO: create a way to notify users of asynchronous callback failures

				GWT.log("AsyncCallback Failed: OnlineGlomService.getDocumentInfo()");

			}

			@Override

			public void onSuccess(final DocumentInfo result) {

				tableSelectionView.setTableSelection(result.getTableNames(), result.getTableTitles());

				if (StringUtils.isEmpty(tableName)) {

					tableName = result.getTableNames().get(result.getDefaultTableIndex());

				}

				tableSelectionView.setSelectedTableName(tableName);

				tableSelectionView.setLocaleList(result.getLocaleIDs(), result.getLocaleTitles());

				final String localeID = Utils.getCurrentLocaleID();

				tableSelectionView.setSelectedLocale(localeID);

				documentTitle = result.getTitle();

				tableSelectionView.setDocumentTitle(documentTitle);

				Window.setTitle(documentTitle + ": " + tableSelectionView.getSelectedTableTitle());

			}

		};

		final String localeID = Utils.getCurrentLocaleID();

		OnlineGlomServiceAsync.Util.getInstance().getDocumentInfo(documentID, localeID, callback);

		// Show the quickFind text that was specified by the URL token:

		tableSelectionView.setQuickFindText(quickFind);

	}

	// This method will be called before the {@link TableSelectionActivity#start(AcceptsOneWidget, EventBus)} method and

	// any time the Place changes after the start method has been called.

	public void setPlace(final HasSelectableTablePlace place) {

		documentID = place.getDocumentID();

		tableName = place.getTableName();

		try {

			final ListPlace asPlace = (ListPlace) place;

			quickFind = asPlace.getQuickFind();

		} catch (final ClassCastException ex) {

			quickFind = "";

		}

		final TableSelectionView tableSelectionView = clientFactory.getTableSelectionView();

		// Update the selected table if it's not correct.

		if (!tableSelectionView.getSelectedTableName().equals(tableName)) {

			tableSelectionView.setSelectedTableName(tableName);

		}

		// show the 'back to list' link if we're at a DetailsPlace, hide it otherwise

		if (place instanceof DetailsPlace) {

			tableSelectionView.setBackLinkVisible(true);

			tableSelectionView.setBackLink(documentID, tableName, ""); // TODO: quickfind?

		} else if (place instanceof ListPlace) {

			tableSelectionView.setBackLinkVisible(false);

		}

		fillView(tableSelectionView);

	}

	private void clearView() {

		clientFactory.getTableSelectionView().clear();

		if (tableChangeHandlerRegistration != null) {

			tableChangeHandlerRegistration.removeHandler();

			tableChangeHandlerRegistration = null;

		}

		if (quickFindChangeHandlerRegistration != null) {

			quickFindChangeHandlerRegistration.removeHandler();

			quickFindChangeHandlerRegistration = null;

		}

		if (localeChangeHandlerRegistration != null) {

			localeChangeHandlerRegistration.removeHandler();

			localeChangeHandlerRegistration = null;

		}

	}

	/*

	 * (non-Javadoc)

	 * 

	 * @see com.google.gwt.activity.shared.AbstractActivity#onCancel()

	 */

	@Override

	public void onCancel() {

		clearView();

	}

	/*

	 * (non-Javadoc)

	 * 

	 * @see com.google.gwt.activity.shared.AbstractActivity#onStop()

	 */

	@Override

	public void onStop() {

		clearView();

	}

	/*

	 * (non-Javadoc)

	 * 

	 * @see org.glom.web.client.ui.View.Presenter#goTo(com.google.gwt.place.shared.Place)

	 */

	@Override

	public void goTo(final Place place) {

		clientFactory.getPlaceController().goTo(place);

	}

}