package org.gcube.portlets.user.newsfeed.client.ui;

import org.gcube.portal.databook.shared.Attachment;

import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Anchor;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HTMLPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Widget;

/**
 * Class to show an attached file.
 * @author Costantino Perciante at ISTI-CNR
 *
 */
public class AttachmentPreviewer extends Composite {	

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

	interface AttachmentPreviewerUiBinder extends
	UiBinder<Widget, AttachmentPreviewer> {
	}

	public AttachmentPreviewer() {
		initWidget(uiBinder.createAndBindUi(this));
	}

	@UiField
	HTMLPanel attachmentContainer;

	@UiField
	Image imagePreview;

	@UiField
	Label fileNameLabel;

	@UiField
	Anchor downloadLabel;

	@UiField
	Anchor showPreviewLabel;

	// save attachment
	private Attachment attachment;

	public AttachmentPreviewer(Attachment a) {

		// init
		initWidget(uiBinder.createAndBindUi(this));

		// save the attachment
		attachment = a;

		// set image preview
		imagePreview.setUrl(a.getThumbnailURL());

		// set file name (be careful on file name length)
		String shownName = a.getName().length() > 21 ? a.getName().substring(0, 18) + "..." : a.getName();
		fileNameLabel.setText(shownName);
		fileNameLabel.setTitle(a.getName());

		// download label
		downloadLabel.setText("Download");
		downloadLabel.setHref(attachment.getUri());
		downloadLabel.setTarget("_blank");

		// preview TODO
		showPreviewLabel.setText("Show");
		showPreviewLabel.addClickHandler(new ClickHandler() {

			@Override
			public void onClick(ClickEvent event) {

				Window.alert("Image preview widget will be made soon...");

			}
		});
		
		// style links
		downloadLabel.addStyleName("link");
		showPreviewLabel.addStyleName("link");

	}

	/**
	 * Change the width of this container.
	 * @param newWidth
	 * @param unit
	 */
	public void changeAttachmentWidth(int newWidth, Unit unit){

		attachmentContainer.getElement().getStyle().setWidth(newWidth, unit);

	}

}