/*
 * #%L
 * GeoWE Project
 * %%
 * Copyright (C) 2015 - 2016 GeoWE.org
 * %%
 * This file is part of GeoWE.org.
 * 
 * GeoWE is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * GeoWE 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with GeoWE.  If not, see <http://www.gnu.org/licenses/>.
 * #L%
 */
package org.geowe.client.local.main.tool.info;

import java.util.ArrayList;
import java.util.List;

import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;

import org.geowe.client.local.ImageProvider;
import org.geowe.client.local.layermanager.LayerManagerWidget;
import org.geowe.client.local.layermanager.tool.LayerTool;
import org.geowe.client.local.layermanager.tool.export.exporter.FileExporter;
import org.geowe.client.local.main.map.GeoMap;
import org.geowe.client.local.messages.UIMessages;
import org.geowe.client.local.model.vector.VectorLayer;
import org.geowe.client.local.ui.ProgressBarDialog;
import org.gwtopenmaps.openlayers.client.feature.VectorFeature;
import org.jboss.errai.common.client.api.tasks.ClientTaskManager;

import com.google.gwt.core.client.GWT;
import com.google.gwt.resources.client.ImageResource;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.user.client.ui.HTML;
import com.sencha.gxt.core.client.XTemplates;
import com.sencha.gxt.core.client.dom.ScrollSupport;
import com.sencha.gxt.core.client.dom.ScrollSupport.ScrollMode;
import com.sencha.gxt.widget.core.client.Dialog;
import com.sencha.gxt.widget.core.client.Dialog.PredefinedButton;
import com.sencha.gxt.widget.core.client.button.TextButton;
import com.sencha.gxt.widget.core.client.container.HorizontalLayoutContainer;
import com.sencha.gxt.widget.core.client.event.SelectEvent;
import com.sencha.gxt.widget.core.client.event.SelectEvent.SelectHandler;

/**
 * Herramienta para generar informe html de una capa
 * 
 * @author [email protected]
 *
 */
@ApplicationScoped
public class HtmlReportLayerTool extends LayerTool {

	@Inject
	private ClientTaskManager taskManager;
	
	public interface VectorLayerTemplate extends XTemplates {
		@XTemplate(source = "LayerInfoTemplate.html")
		public SafeHtml renderTemplate(UIMessages uimessages, VectorLayer data,
				List<List<String>> attrValues, List<String> attrNames);
	}

	@Inject
	public HtmlReportLayerTool(LayerManagerWidget layerManagerWidget,
			GeoMap geoMap) {
		super(layerManagerWidget, geoMap);
		setText(UIMessages.INSTANCE.htmlReportButtonText());
	}

	@Override
	public String getName() {
		return UIMessages.INSTANCE.htmlReportButtonText();
	}

	@Override
	public ImageResource getIcon() {
		return ImageProvider.INSTANCE.fileText24();
	}

	@Override
	public void onClick() {
		final ProgressBarDialog autoMessageBox = new ProgressBarDialog(false,
				UIMessages.INSTANCE.processing());
		autoMessageBox.center();
		autoMessageBox.show();
		taskManager.execute(new Runnable() {
			@Override
			public void run() {
				showDialog(getHtmlReport());
				autoMessageBox.hide();
			}
		});
			
	}

	private void showDialog(final HTML htmlReport) {
		final Dialog simple = new Dialog();
		simple.setHeadingText("GeoWe Report");
		simple.setSize("420px", "420px");
		simple.setResizable(true);
		simple.setHideOnButtonClick(true);
		simple.setPredefinedButtons(PredefinedButton.CLOSE);
		simple.setBodyStyleName("pad-text");
		simple.getBody().addClassName("pad-text");
		simple.add(getPanel(htmlReport));
		simple.addButton(new TextButton(UIMessages.INSTANCE.download(),
				new SelectHandler() {
					@Override
					public void onSelect(SelectEvent event) {
						FileExporter.saveAs(htmlReport.getHTML(),
								getSelectedVectorLayer().getName() + ".html");
					}
				}));
		simple.show();
	}

	private HorizontalLayoutContainer getPanel(final HTML data) {
		HorizontalLayoutContainer panel = new HorizontalLayoutContainer();
		panel.setSize("400px", "400px");
		panel.add(data);
		ScrollSupport scrollSupport = panel.getScrollSupport();
		scrollSupport.setScrollMode(ScrollMode.AUTO);
		return panel;
	}

	public HTML getHtmlReport() {
		VectorLayerTemplate template = GWT.create(VectorLayerTemplate.class);
		VectorFeature[] features = getSelectedVectorLayer().getFeatures();
		if (features == null) {
			features = new ArrayList<VectorFeature>()
					.toArray(new VectorFeature[0]);
		}
		return new HTML(template.renderTemplate(UIMessages.INSTANCE,
				getSelectedVectorLayer(), getAttributesValue(features),
				getAttributeNames()));
	}
	
	private List<List<String>> getAttributesValue(VectorFeature... features) {
		List<List<String>> attrValues = new ArrayList<List<String>>();
		for (VectorFeature feature : features) {
			attrValues.add(feature.getAttributes().getAttributeValues());
		}
		return attrValues;
	}

	private List<String> getAttributeNames() {
		return new ArrayList<String>(getSelectedVectorLayer().getSchema()
				.getAttributeNames());
	}
}