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

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

import org.gcube.portlets.widgets.ckandatapublisherwidget.client.CKanPublisherService;
import org.gcube.portlets.widgets.ckandatapublisherwidget.client.CKanPublisherServiceAsync;
import org.gcube.portlets.widgets.ckandatapublisherwidget.shared.LicensesBean;

import com.github.gwtbootstrap.client.ui.Button;
import com.github.gwtbootstrap.client.ui.ControlGroup;
import com.github.gwtbootstrap.client.ui.ListBox;
import com.github.gwtbootstrap.client.ui.TextArea;
import com.github.gwtbootstrap.client.ui.TextBox;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.uibinder.client.UiHandler;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Widget;

/**
 * Edit metadata form for ckan dataset.
 * @author Costantino Perciante at ISTI-CNR (costantino.perciante@isti.cnr.it)
 */
public class EditMetadataForm extends Composite{
	
	/**
	 * Create a remote service proxy to talk to the server-side ckan service.
	 */
	private final CKanPublisherServiceAsync ckanServices = GWT.create(CKanPublisherService.class);

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

	interface EditMetadataFormUiBinder extends
	UiBinder<Widget, EditMetadataForm> {
	}

	@UiField TextBox titleTextBox;
	@UiField TextBox urlTextbox;
	@UiField TextArea descriptionTextarea;
	@UiField TextBox tagsTextbox;
	@UiField ListBox licenseListbox;
	@UiField ListBox visibilityListbox;
	@UiField ListBox searchableListbox;
	@UiField TextBox sourceTextbox;
	@UiField TextBox versionTextbox;
	@UiField TextBox authorTextbox;
	@UiField TextBox authorEmailTextbox;
	@UiField TextBox maintainerTextbox;
	@UiField TextBox maintainerEmailTextbox;
	@UiField ControlGroup customFields;
	@UiField Button addCustomFieldButton;
	@UiField Button createButton;
	@UiField Button resetButton;
	
	// the licenses
	private LicensesBean licenseBean;

	// added custom field entries 
	List<CustomFieldEntry> customFieldEntries = new ArrayList<CustomFieldEntry>();

	public EditMetadataForm() {
		initWidget(uiBinder.createAndBindUi(this));
		
		// get back the licenses
		ckanServices.getLicenses(new AsyncCallback<LicensesBean>() {
			
			@Override
			public void onSuccess(LicensesBean result) {
				
				if(result != null && !result.getLicenses().isEmpty()){
					
					licenseBean = result;
					
					// fill the listbox
					for(String license: licenseBean.getLicenses()){
						
						licenseListbox.addItem(license);
						
					}
					
				}else
				{
					// TODO
				}
			}
			
			@Override
			public void onFailure(Throwable caught) {
				
				// TODO
				
			}
		});
	}

	@UiHandler("addCustomFieldButton")
	void addCustomFieldEvent(ClickEvent e){

		CustomFieldEntry toAdd = new CustomFieldEntry();
		customFieldEntries.add(toAdd);
		customFields.add(toAdd);

	}

	@UiHandler("createButton")
	void createDatasetEvent(ClickEvent e){

		// TODO

	}

	@UiHandler("resetButton")
	void resetFormEvent(ClickEvent e){

		// reset main fields
		titleTextBox.setText("");
		urlTextbox.setText("");
		descriptionTextarea.setText("");
		tagsTextbox.setText("");
		sourceTextbox.setText("");
		versionTextbox.setText("");
		authorTextbox.setText("");
		authorEmailTextbox.setText("");
		maintainerTextbox.setText("");
		maintainerEmailTextbox.setText("");

		// delete custom fields
		for (CustomFieldEntry customField : customFieldEntries) {
			customField.removeFromParent();
		}
		customFieldEntries.clear();
		
	}
}