package org.kuali.student.common.ui.client.mvc.breadcrumb;

 import java.util.ArrayList;

 import java.util.List;

 import org.kuali.student.common.ui.client.mvc.Controller;

 import org.kuali.student.common.ui.client.mvc.history.HistoryManager;

 import org.kuali.student.common.ui.client.widgets.field.layout.element.SpanPanel;

 import com.google.gwt.user.client.ui.ComplexPanel;

 import com.google.gwt.user.client.ui.Composite;

 import com.google.gwt.user.client.ui.Hyperlink;

 import com.google.gwt.user.client.ui.InlineLabel;

 import com.google.gwt.user.client.ui.Panel;

 import com.google.gwt.user.client.ui.Widget;

 /**

  * Manages breadcrumbs for the application

  * 

  * @author Kuali Student Team

  *

  */

 public class BreadcrumbManager extends Composite{

         public static List<Hyperlink> links = new ArrayList<Hyperlink>();

         private static List<String> names = new ArrayList<String>();

         private static Controller root;

         private static ComplexPanel panel = new SpanPanel();

         private static boolean panelEmpty = true;

         private static Panel parentPanel;

         private static class BreadcrumbData{

                 private String name;

                 private String path;

                 public BreadcrumbData(String name, String path) {

                         super();

                         this.name = name;

                         this.path = path;

                 }

         }

         /**

          * Binds the controller as the top level controller to call collectBreadcrumbNames on.

          * 

          * @param controller

          */

         public static void bind(Controller controller){

                 root = controller;

         }

         /**

          * Updates the breadcrumb panel with the current breadcrumb by walking the controller hierarchy by calling

          * collectBreadcrumbNames on the root controller bound to the BreadcrumbManager.

          * 

          * @param historyStack

          */

         public static void updateLinks(String historyStack){

                 links.clear();

                 panel.clear();

                 panelEmpty = true;

                 names.clear();

                 root.collectBreadcrumbNames(names);

                 String[] arr = HistoryManager.splitHistoryStack(historyStack);

                 List<BreadcrumbData> breadcrumbs = new ArrayList<BreadcrumbData>();

                 if(arr.length == names.size()){

                         String path = "";

                         //account for applicationController - skip first item from both

                         for(int i = 1; i < names.size(); i++){

                                 path = path + "/" + arr[i];

                                 String name = names.get(i);

                                 //Views with empty names do not appear on the breadcrumbs

                                 if(name != null && !name.isEmpty()){

                                         breadcrumbs.add(new BreadcrumbData(name, path));

                                 }

                         }

                 }

                 //Special link, a controller is adding a breadcrumb outside the scope of the current controller

                 //in format name@path

                 else if(names.size() > arr.length){

                         String path = "";

                         int j = 1;

                         //account for applicationController - skip first item from both

                         for(int i = 1; i < names.size(); i++){

                                 String name = names.get(i);

                                 if(name.contains("@")){

                                         String[] split = name.split("@");

                                         name = split[0];

                                         if(name != null && !name.isEmpty()){

                                                 //In the special case the path is the second part of the split

                                                 breadcrumbs.add(new BreadcrumbData(name, split[1]));

                                         }

                                 }

                                 else{

                                         if(j == arr.length){

                                                 break;

                                         }

                                         path = path + "/" + arr[j];

                                         j++;

                                         if(name != null && !name.isEmpty()){

                                                 breadcrumbs.add(new BreadcrumbData(name, path));

                                         }

                                 }

                         }

                 }

                 if(parentPanel != null){

                         if(breadcrumbs.size() == 1){

                                 panel.getParent().setVisible(false);

                         }

                         else{

                                 panel.getParent().setVisible(true);

                         }

                 }

                 for(int i = 0; i < breadcrumbs.size(); i++){

                         if(i < breadcrumbs.size() - 1){

                                 createLink(breadcrumbs.get(i).name, breadcrumbs.get(i).path);

                         }

                         else{

                                 createLabel(breadcrumbs.get(i).name);

                                 //WindowTitleUtils.setSubtitle(breadcrumbs.get(i).name);

                         }

                 }

         }

         private static void createLabel(String name){

                 addToPanel(new InlineLabel(name));

         }

         private static void createLink(String name, final String viewPath){

                 Hyperlink link = new Hyperlink(name, viewPath);

                 links.add(link);

                 addToPanel(link);

         }

         private static void addToPanel(Widget w){

                 if(panelEmpty){

                         panel.add(w);

                         panelEmpty = false;

                 }

                 else{

                         panel.add(new InlineLabel(" \u00BB "));

                         panel.add(w);

                 }

         }

         /** 

          * @return the breadcrumb panel which contains the breadcrumb links dynamically updated by the 

          * BreadcrumbManager

          */

         public static ComplexPanel getBreadcrumbPanel(){

                 return panel;

         }

         public static void setParentPanel(Panel panel){

                 parentPanel = panel;

                 parentPanel.setVisible(false);

         }

 }