/**
 * 
 */
package org.gcube.portlets.user.dataminermanager.client;

import org.gcube.portlets.user.dataminermanager.client.DataMinerManager.MenuItem;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Image;

/**
 * @author ceras
 *
 */
public abstract class Header extends HorizontalPanel {

	public abstract void select(MenuItem menuItem);

	Image menuGoBack, menuExperiment; // menuInputSpace, menuComputations;
	MenuItem currentSelection = null;
	Image currentImageSelection = null;
	//private Image menuDataSpace;

	/**
	 * 
	 */
	public Header() {
		super();
		// this.setStyleAttribute("background-color", "#FFFFFF");
		Image logo = new Image(DataMinerManager.resources.logoLittle());
		logo.setAltText("Data Miner Manager");
		logo.setTitle("Data Miner Manager");
		logo.addStyleName("menuImgLogo");

		menuGoBack = new Image(DataMinerManager.resources.goBack());
		menuGoBack.addStyleName("menuItemImage");
		menuGoBack.addClickHandler(new ClickHandler() {
			@Override
			public void onClick(ClickEvent event) {
				if (setMenuSelected(null))
					select(null);
			}
		});

		/*
		menuDataSpace = new Image(
				DataMinerManager.resources.menuItemInputspace());
		menuDataSpace.addStyleName("menuItemImage");
		menuDataSpace.addClickHandler(new ClickHandler() {
			@Override
			public void onClick(ClickEvent event) {
				if (setMenuSelected(MenuItem.DATA_SPACE))
					select(MenuItem.DATA_SPACE);
			}
		});
		*/

		menuExperiment = new Image(
				DataMinerManager.resources.menuItemExperiment());
		menuExperiment.addStyleName("menuItemImage");
		menuExperiment.addClickHandler(new ClickHandler() {
			@Override
			public void onClick(ClickEvent event) {
				if (setMenuSelected(MenuItem.EXPERIMENT))
					select(MenuItem.EXPERIMENT);
			}
		});

		/*
		 * menuComputations = new Image(
		 * DataMinerManager.resources.menuItemComputations());
		 * menuComputations.addStyleName("menuItemImage");
		 * menuComputations.addClickHandler(new ClickHandler() {
		 * 
		 * @Override public void onClick(ClickEvent event) { if
		 * (setMenuSelected(MenuItem.COMPUTATIONS))
		 * select(MenuItem.COMPUTATIONS); } });
		 */

		this.add(logo);
		this.add(menuGoBack);
		//this.add(menuDataSpace);
		this.add(menuExperiment);
		// this.add(menuComputations);

		this.setCellWidth(logo, "100px");
		this.setCellWidth(menuGoBack, "100px");
		//this.setCellWidth(menuDataSpace, "80px");
		this.setCellWidth(menuExperiment, "80px");
		// this.setCellWidth(menuComputations, "80px");

		menuGoBack.setVisible(false);
		//menuDataSpace.setVisible(false);
		menuExperiment.setVisible(false);
		// menuComputations.setVisible(false);
	}

	/**
	 * @param inputSpace
	 */
	public boolean setMenuSelected(MenuItem menuItem) {
		// return true if the menu was changed

		if (menuItem == currentSelection)
			return false; // nothing to change

		if (menuItem == null) {
			menuGoBack.setVisible(false);
			//menuDataSpace.setVisible(false);
			menuExperiment.setVisible(false);
			// menuComputations.setVisible(false);

			if (currentSelection == MenuItem.EXPERIMENT)
				menuExperiment.removeStyleName("menuItemImage-selected");
			/*
			else if (currentSelection == MenuItem.DATA_SPACE)
				menuDataSpace.removeStyleName("menuItemImage-selected");
			*/
			/*
			 * else if (currentSelection == MenuItem.COMPUTATIONS)
			 * menuComputations.removeStyleName("menuItemImage-selected");
			 */
		} else {
			if (currentSelection == null) {

				menuGoBack.setVisible(true);
				//menuDataSpace.setVisible(true);
				menuExperiment.setVisible(true);
				// menuComputations.setVisible(true);
			}

			if (currentSelection == MenuItem.EXPERIMENT)
				menuExperiment.removeStyleName("menuItemImage-selected");
			/*else if (currentSelection == MenuItem.DATA_SPACE)
				menuDataSpace.removeStyleName("menuItemImage-selected");*/

			/*
			 * else if (currentSelection == MenuItem.COMPUTATIONS)
			 * menuComputations.removeStyleName("menuItemImage-selected");
			 */

			Image imgNew=menuExperiment;
			
			/*
			Image imgNew = (menuItem == MenuItem.DATA_SPACE ? menuDataSpace
					: menuExperiment);
			*/
			/*
			 * Image imgNew = (menuItem == MenuItem.DATA_SPACE ? menuDataSpace :
			 * (menuItem == MenuItem.EXPERIMENT ? menuExperiment :
			 * menuComputations));
			 */

			imgNew.addStyleName("menuItemImage-selected");
		}

		currentSelection = menuItem;
		return true;
	}
}