package org.gcube.portlets.widgets.ckandatapublisherwidget.client.ui;

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

import org.gcube.portlets.widgets.ckandatapublisherwidget.client.events.AddResourceEvent;
import org.gcube.portlets.widgets.ckandatapublisherwidget.client.events.AddResourceEventHandler;
import org.gcube.portlets.widgets.ckandatapublisherwidget.shared.ResourceBean;

import com.github.gwtbootstrap.client.ui.Button;
import com.github.gwtbootstrap.client.ui.constants.ButtonType;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;

/**
 * A summary of the added resources by the user.
 * @author Costantino Perciante at ISTI-CNR (costantino.perciante@isti.cnr.it)
 */
public class AddedResourcesSummary extends Composite{

	private static AddedResourcesSummaryUiBinder uiBinder = GWT
			.create(AddedResourcesSummaryUiBinder.class);

	interface AddedResourcesSummaryUiBinder extends
	UiBinder<Widget, AddedResourcesSummary> {
	}

	// Event bus
	private HandlerManager eventBus;

	// list of added resources
	List<ResourceBean> addedResources;

	@UiField VerticalPanel addResourcesPanel;

	public AddedResourcesSummary(HandlerManager eventBus) {
		initWidget(uiBinder.createAndBindUi(this));

		// save bus
		this.eventBus = eventBus;

		// bind on add resource event
		bind();

		// init list
		addedResources = new ArrayList<ResourceBean>();
	}

	private void bind() {

		// when a new resource is added
		eventBus.addHandler(AddResourceEvent.TYPE, new AddResourceEventHandler() {

			@Override
			public void onAddedResource(AddResourceEvent addResourceEvent) {

				// get the resource
				final ResourceBean justAddedResource = addResourceEvent.getResource();

				// check if a resource with this id already exists
				for (ResourceBean resource : addedResources){

					if(resource.getId().equals(justAddedResource.getId())){

						// clear list and rebuild
						rebuildSummary();
						return;
					}
				}

				Button associatedButton = new Button();
				associatedButton.setType(ButtonType.LINK);
				associatedButton.setText("-" + justAddedResource.getName());

				// add to the list
				addedResources.add(justAddedResource);

				// add to the panel
				addResourcesPanel.add(associatedButton);
				
				// add handler to swap tab on click
				associatedButton.addClickHandler(new ClickHandler() {

					@Override
					public void onClick(ClickEvent event) {

						// TODO show information below this link and swap panel 

					}
				});

			}
		});
	}

	/**
	 * Rebuild the summary list
	 */
	protected void rebuildSummary() {
		
		addResourcesPanel.clear();
		
		for (final ResourceBean resource : addedResources){
			
			Button associatedButton = new Button();
			associatedButton.setType(ButtonType.LINK);
			associatedButton.setText("-" + resource.getName());

			// add to the list
			addedResources.add(resource);

			// add to the panel
			addResourcesPanel.add(associatedButton);
			
			// add handler to swap tab on click
			associatedButton.addClickHandler(new ClickHandler() {

				@Override
				public void onClick(ClickEvent event) {

					// TODO show information below this link and swap panel 

				}
			});
		}
	}
}