/*

 * 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.ClientFactory;

import org.glom.web.client.OnlineGlomServiceAsync;

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

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

import org.glom.web.shared.Documents;

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

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

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 DocumentSelectionActivity extends AbstractActivity implements View.Presenter {

	// TODO inject with GIN

	private final ClientFactory clientFactory;

	private final DocumentSelectionView documentSelectionView;

	public DocumentSelectionActivity(final ClientFactory clientFactory) {

		this.clientFactory = clientFactory;

		this.documentSelectionView = clientFactory.getDocumentSelectionView();

	}

	@Override

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

		Window.setTitle("Online Glom");

		documentSelectionView.setPresenter(this);

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

			@Override

			public void onFailure(final Throwable caught) {

				// Try to get an error message. Most likely this won't work but it's worth a try.

				getAndSetErrorMessage();

			}

			@Override

			public void onSuccess(final Documents documents) {

				documentSelectionView.clearHyperLinks();

				if (documents.getCount() > 0) {

					for (int i = 0; i < documents.getCount(); i++) {

						documentSelectionView

								.addDocumentLink(documents.getDocumentID(i), documents.getTitle(i));

						// TODO: Get default locale.

					}

				} else {

					getAndSetErrorMessage();

				}

			}

		};

		OnlineGlomServiceAsync.Util.getInstance().getDocuments(callback);

		panel.setWidget(documentSelectionView.asWidget());

	}

	@Override

	public void goTo(final Place place) {

		clientFactory.getPlaceController().goTo(place);

	}

	private void getAndSetErrorMessage() {

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

			@Override

			public void onFailure(final Throwable caught) {

				documentSelectionView

						.setErrorMessage("Unable to communicate with the servlet. Check the error log for more information.");

			}

			@Override

			public void onSuccess(final String errorMessage) {

				documentSelectionView.setErrorMessage("Configuration Error: " + errorMessage);

			}

		};

		OnlineGlomServiceAsync.Util.getInstance().getConfigurationErrorMessage(callback);

	}

}