ckan-metadata-publisher-widget/src/main/java/org/gcube/portlets/widgets/ckandatapublisherwidget/client/ui/MetaDataFieldSkeleton.java

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

import java.util.List;

import org.gcube.portlets.widgets.ckandatapublisherwidget.client.ui.utils.GcubeDialogExtended;
import org.gcube.portlets.widgets.ckandatapublisherwidget.shared.MetadataFieldWrapper;

import com.github.gwtbootstrap.client.ui.CheckBox;
import com.github.gwtbootstrap.client.ui.ControlLabel;
import com.github.gwtbootstrap.client.ui.Controls;
import com.github.gwtbootstrap.client.ui.Icon;
import com.github.gwtbootstrap.client.ui.ListBox;
import com.github.gwtbootstrap.client.ui.Popover;
import com.github.gwtbootstrap.client.ui.TextBox;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.SpanElement;
import com.google.gwt.dom.client.Style.Cursor;
import com.google.gwt.dom.client.Style.Display;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.logical.shared.ResizeEvent;
import com.google.gwt.event.logical.shared.ResizeHandler;
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.Window;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.FocusPanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.SimplePanel;
import com.google.gwt.user.client.ui.Widget;

public class MetaDataFieldSkeleton extends Composite{

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

	interface MetaDataFieldSkeletonUiBinder extends
	UiBinder<Widget, MetaDataFieldSkeleton> {
	}

	@UiField Element mandatorySymbol;
	@UiField SpanElement name;
	@UiField SimplePanel elementPanel;
	@UiField FlowPanel noteFieldContainer;
	@UiField Popover noteFieldPopover;
	@UiField ControlLabel controlLabel;
	@UiField Controls controls;
	@UiField Icon infoIcon;
	@UiField FocusPanel focusPanelIconContainer;

	// the element that holds the value (it could be a checkbox, textbox or listbox)
	private Widget holder;

	// the field this object represents
	private MetadataFieldWrapper field;

	// the dialog box for this metadata
	private GcubeDialogExtended dialog;

	public MetaDataFieldSkeleton(MetadataFieldWrapper field) {
		initWidget(uiBinder.createAndBindUi(this));

		// prepare information
		this.field = field;

		// add custom css properties
		controls.addStyleName("form-controls-custom");
		controlLabel.addStyleName("form-control-label-custom");

		// save the name
		name.setInnerText(field.getFieldName() + ":");

		// check if it is mandatory
		if(!field.getMandatory())
			mandatorySymbol.getStyle().setDisplay(Display.NONE);

		if(field.getIsBoolean()){

			// its a checkbox
			holder = new CheckBox();

			if(field.getDefaulValue() != null)
				((CheckBox)holder).setValue(Boolean.valueOf(field.getDefaulValue()));

			// add to the elementPanel
			elementPanel.add(holder);

		}else{

			// it could be a listbox or a textbox according to the vocabulary fields
			if(field.getVocabulary() == null || field.getVocabulary().isEmpty()){

				// textbox
				holder = new TextBox();

				if(field.getDefaulValue() != null)
					((TextBox)holder).setText(field.getDefaulValue());

				// add to the elementPanel
				elementPanel.add(holder);


			}else{

				// listbox
				holder = new ListBox();

				// get vocabulary fields
				List<String> vocabulary = field.getVocabulary();

				for (String term : vocabulary) {

					((ListBox)holder).addItem(term);

				}

				// set default value
				((ListBox)holder).setSelectedValue(field.getDefaulValue());

				// add to the elementPanel
				elementPanel.add(holder);

			}
		}

		// set holder width
		if(holder.getClass().equals(ListBox.class))
			holder.setWidth("96%");
		else
			holder.setWidth("95%");

		// set the notes, if any, and the popover
		if(field.getNote() != null && !field.getNote().isEmpty()){
			noteFieldPopover.setText(new HTML("<p style='color:initial'>" + field.getNote() +"</p>").getHTML());
			noteFieldPopover.setHeading(new HTML("<b>" + field.getFieldName() +"</b>").getHTML());
			infoIcon.getElement().getStyle().setCursor(Cursor.HELP);
			noteFieldPopover.setHtml(true);
			noteFieldContainer.setVisible(true);
		}else{
			noteFieldContainer.setVisible(false);
		}

		// add a resize handler to center the dialog box if it's not null
		Window.addResizeHandler(new ResizeHandler() {

			@Override
			public void onResize(ResizeEvent event) {

				if(dialog != null)
					dialog.center();

			}
		});

	}

	@UiHandler("focusPanelIconContainer")
	void onInfoIconClick(ClickEvent c){

		if(dialog == null){

			// create the dialog box
			dialog = new GcubeDialogExtended(field.getFieldName(), field.getNote());

			// set as non modal
			dialog.setModal(false);
		}

		// else just show and center
		dialog.center();
		dialog.show();
	}

	/**
	 * Check if this field has a valid values
	 * @return
	 */
	public boolean isFieldValueValid() {

		String validator = field.getValidator();
		
		GWT.log("Validator is " + validator);

		// if validator is not present and it is not a textbox
		if((validator == null || validator.isEmpty()) && !(holder.getClass().equals(TextBox.class) && field.getMandatory()))
			return true;

		// current value
		String value;

		// we validate only listbox and textbox
		if(holder.getClass().equals(ListBox.class))
			value = ((ListBox)holder).getSelectedItemText();
		else if(holder.getClass().equals(TextBox.class)){
			value = ((TextBox)holder).getText();

			// if there is not a validator...
			if(validator == null){
				if(value.isEmpty() && field.getMandatory())
					return false;
				else if(value.isEmpty() && !field.getMandatory())
					return true;
				else if(!value.isEmpty())
					return true;
			}
		}
		else
			return true; // it's a checkbox (the value doesn't matter)

		return value.matches(validator);

	}

	/**
	 * Returns the current value of the field
	 * @return
	 */
	public String getFieldCurrentValue(){

		String value;

		// we validate only listbox and textbox
		if(holder.getClass().equals(ListBox.class))
			value = ((ListBox)holder).getSelectedItemText();
		else if(holder.getClass().equals(TextBox.class))
			value = ((TextBox)holder).getText();
		else
			value = ((CheckBox)holder).getValue().toString();

		return value;
	}

	/**
	 * Returns the current value of the field
	 * @return
	 */
	public String getFieldName(){

		return field.getFieldName();

	}

	/**
	 * Freeze this widget (after on create)
	 */
	public void freeze() {

		if(holder.getClass().equals(ListBox.class))
			((ListBox)holder).setEnabled(false);
		else if(holder.getClass().equals(TextBox.class))
			((TextBox)holder).setEnabled(false);
		else
			((CheckBox)holder).setEnabled(false);

	}

}