package org.kuali.student.common.ui.client.configurable.mvc.layouts;

 import java.util.ArrayList;

 import java.util.HashMap;

 import java.util.List;

 import java.util.Map;

 import org.kuali.student.common.ui.client.configurable.mvc.LayoutController;

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

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

 import org.kuali.student.common.ui.client.widgets.KSButton;

 import org.kuali.student.common.ui.client.widgets.headers.KSDocumentHeader;

 import org.kuali.student.common.ui.client.widgets.menus.KSMenuItemData;

 import org.kuali.student.common.ui.client.widgets.menus.impl.KSBlockMenuImpl;

 import org.kuali.student.common.ui.client.widgets.panels.collapsable.VerticalCollapsableDrawer;

 import com.google.gwt.event.dom.client.ClickEvent;

 import com.google.gwt.event.dom.client.ClickHandler;

 import com.google.gwt.user.client.Command;

 import com.google.gwt.user.client.DeferredCommand;

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

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

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

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

 /**

  * A layout controller which generates a menu for views that added to it through addMenuItem calls.

  * The user can click on items in the menu to show the view.

  * 

  * @author Kuali Student Team

  *

  */

 public class MenuSectionController extends LayoutController implements ContentNavLayoutController {

     private KSBlockMenuImpl menu = new KSBlockMenuImpl();

     private List<KSMenuItemData> topLevelMenuItems = new ArrayList<KSMenuItemData>();

     protected Map<String, List<View>> menuViewMap = new HashMap<String, List<View>>();

     private Map<Enum<?>, List<KSButton>> viewButtonsMap = new HashMap<Enum<?>, List<KSButton>>();

     protected Map<Enum<?>, KSMenuItemData> viewMenuItemMap = new HashMap<Enum<?>, KSMenuItemData>();

     private List<View> menuOrder = new ArrayList<View>();

     private FlowPanel layout = new FlowPanel();

     private KSDocumentHeader header = new KSDocumentHeader();

     private FlowPanel rightPanel = new FlowPanel();

     private FlowPanel contentPanel = new FlowPanel();

     private FlowPanel buttonPanel = new FlowPanel();

     private VerticalPanel leftPanel = new VerticalPanel();

     private SimplePanel sideBar = new SimplePanel();

     private boolean refreshMenuOnAdd = true;

     private VerticalCollapsableDrawer collapsablePanel = new VerticalCollapsableDrawer();

     private Callback<Boolean> showViewCallback = new Callback<Boolean>() {

         @Override

         public void exec(Boolean result) {

             if (result == false) {

                 KSMenuItemData item = viewMenuItemMap.get(MenuSectionController.this.getCurrentView().getViewEnum());

                 if (item != null) {

                     item.setSelected(true, false);

                 }

             }

         }

     };

     public MenuSectionController() {

         super();

         List<View> list = new ArrayList<View>();

         menuViewMap.put("", list);

         menu.setStyleName("ks-menu-layout-menu");

         rightPanel.setStyleName("ks-menu-layout-rightColumn");

         collapsablePanel.addStyleName("ks-menu-layout-leftColumn");

         layout.addStyleName("ks-menu-layout");

         menu.setTopLevelItems(topLevelMenuItems);

         collapsablePanel.setContent(leftPanel);

         leftPanel.add(menu);

         leftPanel.add(sideBar);

         rightPanel.add(header);

         rightPanel.add(contentPanel);

         rightPanel.add(buttonPanel);

         layout.add(collapsablePanel);

         layout.add(rightPanel);

         header.setVisible(false);

         this.showPrint(true);

         this.initWidget(layout);

     }

     public void removeMenuNavigation() {

         collapsablePanel.removeFromParent();

     }

     public void setContentTitle(String title) {

         header.setTitle(title);

         header.setVisible(true);

     }

     public void addContentWidget(Widget w) {

         header.addWidget(w);

         header.setVisible(true);

     }

     public void setSideBarWidget(Widget w) {

         sideBar.setWidget(w);

     }

     public void setContentInfo(String info) {

         header.getInfoLabel().setHTML(info);

         header.getInfoLabel().removeStyleName("content-warning");

         header.getInfoLabel().addStyleName("content-info");

     }

     public void setContentWarning(String info) {

         header.getInfoLabel().setHTML(info);

         header.getInfoLabel().removeStyleName("content-info");

         header.getInfoLabel().addStyleName("content-warning");

     }

     public void showPrint(boolean show){

             header.showPrint(show);

     }

     /**

      * @see org.kuali.student.common.ui.client.configurable.mvc.layouts.ContentNavLayoutController#addCommonButton(java.lang.String, org.kuali.student.common.ui.client.widgets.KSButton)

      */

     public void addCommonButton(String parentMenu, KSButton button) {

         if (parentMenu != null) {

             List<View> views = menuViewMap.get(parentMenu);

             if (views != null) {

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

                     addButtonForView(views.get(i).getViewEnum(), button);

                 }

             }

         }

     }

     /**

      * @see org.kuali.student.common.ui.client.configurable.mvc.layouts.ContentNavLayoutController#addCommonButton(java.lang.String, org.kuali.student.common.ui.client.widgets.KSButton, java.util.List)

      */

     public void addCommonButton(String parentMenu, KSButton button, List<Enum<?>> excludedViews) {

         if (parentMenu != null) {

             List<View> views = menuViewMap.get(parentMenu);

             if (views != null) {

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

                     if (!excludedViews.contains(views.get(i).getViewEnum())) {

                         addButtonForView(views.get(i).getViewEnum(), button);

                     }

                 }

             }

         }

     }

     public void showNextViewOnMenu() {

         int i = menuOrder.indexOf(this.getCurrentView());

         if (i != -1 && i + 1 < menuOrder.size()) {

             this.showView(menuOrder.get(i + 1).getViewEnum());

         }

     }

     public void addButtonForView(Enum<?> viewType, KSButton button) {

         List<KSButton> buttons = viewButtonsMap.get(viewType);

         if (buttons == null) {

             buttons = new ArrayList<KSButton>();

             button.addStyleName("ks-button-spacing");

             buttons.add(button);

             viewButtonsMap.put(viewType, buttons);

         } else {

             buttons.add(button);

         }

     }

     @Override

     protected void hideView(View view) {

         contentPanel.clear();

         buttonPanel.clear();

     }

     @Override

     protected void renderView(View view) {

         contentPanel.add(view.asWidget());

         List<KSButton> buttons = viewButtonsMap.get(view.getViewEnum());

         if (buttons != null) {

             for (KSButton button : buttons) {

                 buttonPanel.add(button);

             }

         }

         KSMenuItemData item = viewMenuItemMap.get(view.getViewEnum());

         if (item != null) {

             item.setSelected(true, false);

         }

     }

     /* Adds 'name' of the menu above menu items. This menu name has no view */

     public void addMenu(String title) {

         if (title != null && !title.equals("")) {

             KSMenuItemData item = new KSMenuItemData(title);

             topLevelMenuItems.add(item);

             List<View> list = new ArrayList<View>();

             menuViewMap.put(title, list);

             if (refreshMenuOnAdd) {

                 menu.refresh();

             }

         }

     }

     /**

      * Adds a view whose view the menu at first.  addMenuItem() should not be called before this method if it is

      * intended for this to be the first view the user sees.  revealMenuItems()

      * must be called to show any items that were added after this call.

      * IMPORTANT: the order in which you call this method, addMenuItem and addSpecialMenuItem affects the order in which they appear

      * on the menu, but also the order in which they are shown when the showNextViewOnMenu is called.  Care must be

      * taken when calling these methods to insure a consistent/logical UI.

      */

     public void addStartMenuItem(String parentMenu, final View view) {

         addMenuItem(parentMenu, view);

         this.setDefaultView(view.getViewEnum());

         refreshMenuOnAdd = false;

         menu.refresh();

     }

     public void revealMenuItems() {

         menu.refresh();

         refreshMenuOnAdd = true;

     }

     /**

      * Adds a view whose view name will appear as a link on the menu, the view will be shown when this item is clicked.

      * IMPORTANT: the order in which you call addMenuItem and addSpecialMenuItem affects the order in which they appear

      * on the menu, but also the order in which they are shown when the showNextViewOnMenu is called.  Care must be

      * taken when calling these methods to insure a consistent/logical UI.

      */

     @Override

     public void addMenuItem(String parentMenu, final View view) {

         super.addView(view);

         KSMenuItemData parentItem = null;

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

             if (topLevelMenuItems.get(i).getLabel().equals(parentMenu)) {

                 parentItem = topLevelMenuItems.get(i);

                 break;

             }

         }

         KSMenuItemData item = new KSMenuItemData(view.getName());

         viewMenuItemMap.put(view.getViewEnum(), item);

         item.setClickHandler(new ClickHandler() {

             @Override

             public void onClick(ClickEvent event) {

                 DeferredCommand.addCommand(new Command() {

                     @Override

                     public void execute() {

                         MenuSectionController.this.showView(view.getViewEnum(), showViewCallback);

                     }

                 });

             }

         });

         if (parentItem != null) {

             menuOrder.add(view);

             parentItem.addSubItem(item);

             menuViewMap.get(parentMenu).add(view);

         } else {

             menuOrder.add(view);

             topLevelMenuItems.add(item);

             menuViewMap.get("").add(view);

         }

         if (refreshMenuOnAdd) {

             menu.refresh();

         }

     }

     /**

      * This adds a special item that is a top level menu item to the menu, this will appear directly below other

      * menus that are currently added to the menu.  This menu item has special styling to make it more apparent on

      * the menu visually.

      * IMPORTANT: the order in which you call addMenuItem and addSpecialMenuItem affects the order in which they appear

      * on the menu, but also the order in which they are shown when the showNextViewOnMenu is called.  Care must be

      * taken when calling these methods to insure a consistent/logical UI.

      */

     @Override

     public void addSpecialMenuItem(final View view, String description) {

         //TODO add description to the menu item

         super.addView(view);

         menuViewMap.get("").add(view);

         menuOrder.add(view);

         KSMenuItemData item = new KSMenuItemData(view.getName());

         item.addSpecialStyle("ks-menu-layout-special-menu-item-panel");

         viewMenuItemMap.put(view.getViewEnum(), item);

         item.setClickHandler(new ClickHandler() {

             @Override

             public void onClick(ClickEvent event) {

                 DeferredCommand.addCommand(new Command() {

                     @Override

                     public void execute() {

                         MenuSectionController.this.showView(view.getViewEnum(), showViewCallback);

                     }

                 });

             }

         });

         topLevelMenuItems.add(item);

         if (refreshMenuOnAdd) {

             menu.refresh();

         }

     }

     /**

      * This version of updateModel only traverses views that can be accessed through its menu.

      * Views that are part of this controller, but not part of the menu, can update their views through

      * updateModelFromCurrentView and updateModelFromView methods.

      */

     @Override

     public void updateModel() {

         for (View v : menuOrder) {

             v.updateModel();

         }

     }

 }