package org.gcube.portlets.user.reportgenerator.client;

import java.util.Date;

import org.gcube.portlets.user.reportgenerator.client.Presenter.Presenter;
import org.gcube.portlets.user.reportgenerator.client.model.TemplateModel;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.i18n.client.DateTimeFormat;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.CellPanel;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HasAlignment;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.HasVerticalAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;

	/**
	 * <code> TitleBar </code> class is the top top bar component of the UI 
	 *
	 * @author Massimiliano Assante, ISTI-CNR - massimiliano.assante@isti.cnr.it
	 * 
	 * @version July 2011 (3.0) 
	 */
	public class TitleBar extends Composite{


		private Presenter presenter;

		/**
		 * the template Model
		 */
		private TemplateModel templateModel;

		/**
		 * mainLayout Panel
		 */
		private CellPanel mainLayout = new HorizontalPanel();

		/**
		 *  contains the current template name
		 */
		private HTML templateNameBox = new HTML();
		
		/**
		 *  contains the last edit date and the the last edit person username
		 */
		private HTML editedOn = new HTML();
		/**
		 * contains the page displayer
		 */
		private HTML pageDisplayer = new HTML(); 


		private HTML prevButton = new HTML("<img src=\"" + ReportConstants.IMAGE_PREV_PAGE + "\" />&nbsp;", true);
		private HTML nextButton = new HTML("&nbsp;&nbsp;&nbsp;&nbsp;<img src=\"" + ReportConstants.IMAGE_NEXT_PAGE + "\" />", true);


		private HorizontalPanel captionPanel = new HorizontalPanel();
		/**
		 * Constructor
		 * @param c the controller instance for this UI component
		 */
		public TitleBar(Presenter c) {
			this.presenter = c;
			this.templateModel = presenter.getModel();


			//initialize the template
			setTemplateName(templateModel.getTemplateName());

			setPageDisplayer(1, 1);

		
			mainLayout.setSize("90%", "24px");
//			mainLayout.setStyleName("newresultset-header");

		

			//design the part for the template name and the pages handling

			HorizontalPanel innerCaptionPanel = new HorizontalPanel();
			captionPanel.setWidth("100%");

			//hide the buttons at the beginning
			nextButton.addStyleName("setVisibilityOff");
			prevButton.addStyleName("setVisibilityOff");

			HorizontalPanel pageHandlerPanel = new HorizontalPanel();
			pageHandlerPanel.setHeight("24");
			pageHandlerPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE);

			pageHandlerPanel.add(prevButton);
			pageHandlerPanel.add(pageDisplayer);
			pageHandlerPanel.add(nextButton);
			pageHandlerPanel.setWidth("100%");
			
			templateNameBox.setStyleName("menubar-font");
			
			captionPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_LEFT);
			innerCaptionPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_LEFT);
			innerCaptionPanel.setVerticalAlignment(HasAlignment.ALIGN_MIDDLE);
			innerCaptionPanel.add(templateNameBox);
			innerCaptionPanel.add(editedOn);
			captionPanel.setVerticalAlignment(HasAlignment.ALIGN_MIDDLE);
			captionPanel.add(innerCaptionPanel);
			mainLayout.add(captionPanel);
			mainLayout.add(pageHandlerPanel);
			editedOn.setStyleName("docEditedBy");
			mainLayout.setCellHorizontalAlignment(captionPanel, HasHorizontalAlignment.ALIGN_LEFT);
			mainLayout.setCellVerticalAlignment(captionPanel, HasVerticalAlignment.ALIGN_MIDDLE);
			
			mainLayout.setCellWidth(pageHandlerPanel, "200");
			initWidget(mainLayout);

			nextButton.addClickHandler(new ClickHandler() {
				public void onClick(ClickEvent event) {	presenter.nextPageButtonClicked();					
				}
			});

			prevButton.addClickHandler(new ClickHandler() {
				public void onClick(ClickEvent event) { presenter.prevPageButtonClicked(); }		
			});
		}
		/**
		 * add the buttons well visible on the top
		 * @param isEdit
		 */
		public void addWorkflowButtons(final boolean isEdit) {
			Button update = new Button("Update (SAVE)");
			update.addClickHandler(new ClickHandler() {
				@Override
				public void onClick(ClickEvent event) {
					presenter.updateWorkflowDocument(isEdit);	
				}
			});
			Button back = new Button("Do not Update");
			back.addClickHandler(new ClickHandler() {
				@Override
				public void onClick(ClickEvent event) {
					presenter.updateWorkflowDocument(isEdit);	
				}
			});
			update.addStyleName("addEntryButton");
			back.addStyleName("deleteEntryButton");
			captionPanel.add(update);
			captionPanel.add(back);
		
		}
		/**
		 * changes the pages label in the UI : e.g. Page x of y
		 * @param currentPage . 
		 * @param totalPages .
		 */
		public void setPageDisplayer(int currentPage, int totalPages) {
			pageDisplayer.setHTML("Section "+ currentPage + " of " + totalPages);	
		}

		/**
		 * changes the template name label in the UI
		 * @param name .
		 */
		public void setTemplateName(String name) {
			templateNameBox.setHTML("&nbsp;&nbsp;" + name);
		}

		/**
		 * changes the template name label in the UI
		 * @param username .
		 * @param date .
		 */
		public void setEditedOnBy(Date date, String username) {
			String dt = DateTimeFormat.getShortDateFormat().format(date);

			editedOn.setHTML("&nbsp;&nbsp;edited on " + dt + "&nbsp;&nbsp;by " + username);
		}
		/**
		 * Shows the previous botton in the UI
		 */
		public void showPrevButton() {
			prevButton.removeStyleName("setVisibilityOff");
			prevButton.addStyleName("setVisibilityOn");
		}
		/**
		 * Shows the next botton in the UI
		 */
		public void showNextButton() {
			nextButton.removeStyleName("setVisibilityOff");
			nextButton.addStyleName("setVisibilityOn");
		}

		/**
		 * Hide the previous botton in the UI
		 */
		public void hidePrevButton() {
			prevButton.removeStyleName("setVisibilityOn");
			prevButton.addStyleName("setVisibilityOff");
		}
		/**
		 * Hide the next botton in the UI
		 */
		public void hideNextButton() {
			nextButton.removeStyleName("setVisibilityOn");
			nextButton.addStyleName("setVisibilityOff");
		}
		/**
		 * temporary command 
		 * @return the command instance
		 */
		public Command getNullCommand() {
			Command openNothing = new Command() {	

				public void execute() {
					Window.alert("Feature not supported yet");

				}
			};

			return openNothing;
		}


	}