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.application.Application;
   import org.kuali.student.common.ui.client.configurable.mvc.SectionTitle;
  import org.kuali.student.common.ui.client.configurable.mvc.views.SectionView;
  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.KSButtonAbstract.ButtonStyle;
  import org.kuali.student.common.ui.client.widgets.menus.KSMenuItemData;
  
  import com.google.gwt.event.dom.client.ClickEvent;
  import com.google.gwt.event.dom.client.ClickHandler;
  import com.google.gwt.user.client.ui.FlowPanel;
  
  public class MenuEditableSectionController extends MenuSectionController{
  	
  	private boolean editMode = false;
  	private boolean isEditable = true;
  	
  	//better way to do this other than 2 maps?
  	private Map<Enum<?>, Enum<?>> readOnlyToEditMap = new HashMap<Enum<?>, Enum<?>>();
  	private Map<Enum<?>, Enum<?>> editToReadOnlyMap = new HashMap<Enum<?>, Enum<?>>();
  	
  	private List<View> readOnlyViews = new ArrayList<View>();
  	private List<KSButton> editLinks = new ArrayList<KSButton>();
  	
  	private Callback<Boolean> editLinkCallback = new Callback<Boolean>(){
  
  		@Override
  		public void exec(Boolean result) {
  			if(result == true){
  				KSMenuItemData item = viewMenuItemMap.get(getCurrentView().getViewEnum());
  				if(item == null){
  					Enum<?> readOnlyEnum = editToReadOnlyMap.get(getCurrentView().getViewEnum());
  					if(readOnlyEnum != null){
  						item = viewMenuItemMap.get(readOnlyEnum);
  					}
  				}
  				if(item != null && !item.isSelected()){
  					item.setSelected(true, false);
  				}
  			}
  		}
  	};
  
  	public MenuEditableSectionController() {
  		super();
  	}
  	
  	public void addMenuItem(String parentMenu, final View readOnlyView, final View editView){
  		super.addMenuItem(parentMenu, readOnlyView);
  		this.addView(editView);
  		readOnlyToEditMap.put(readOnlyView.getViewEnum(), editView.getViewEnum());
  		editToReadOnlyMap.put(editView.getViewEnum(), readOnlyView.getViewEnum());
  		attachEditLink(readOnlyView);
  	}
  	
  	public void attachEditLink(final View v){
  		readOnlyViews.add(v);
  		createEditLink(v);
  	}
  	
  	public KSButton generateEditLink(final View v){
  		KSButton editLink = new KSButton(Application.getApplicationContext().getMessage("edit"), ButtonStyle.DEFAULT_ANCHOR, new ClickHandler(){
  			
  			@Override
  			public void onClick(ClickEvent event) {
  				editMode = true;
  				showView(v.getViewEnum(), editLinkCallback);
  			}
  		});
  		editLinks.add(editLink);
  		
  		editLink.addStyleName("ks-header-edit-link");
  		
  		return editLink;
  	}
  	
  	private void createEditLink(final View v){
  		if(isEditable){
  			KSButton editLink = generateEditLink(v);
  			
  			if(v instanceof SectionView){
  				//TODO Change to put in section header
  				SectionTitle title = ((SectionView) v).getLayout().getLayoutTitle();
  				if(title != null){
  					title.add(editLink);
  				}
  				else{
  					((SectionView) v).getLayout().insert(editLink, 0);
  				}
  			}
  			else if(v.asWidget() instanceof FlowPanel){
 				((FlowPanel)v.asWidget()).insert(editLink, 0);
 			}
 		}
 	}
 	
 	private void detachEditLinks(){
 		for(KSButton b: editLinks){
 			b.removeFromParent();
 		}
 	}
 	
 	@Override
 	public <V extends Enum<?>> void showView(V viewType, Callback<Boolean> onReadyCallback){
 		//show the edit view only
 		if(editMode && isEditable){
 			Enum<?> editViewEnum = readOnlyToEditMap.get(viewType);
 			if(editViewEnum != null){
 				super.showView(editViewEnum, onReadyCallback);
 			}
 			else{
 				super.showView(viewType, onReadyCallback);
 			}
 		}
 		//show the read only view only
 		else{
 			Enum<?> readOnlyEnum = editToReadOnlyMap.get(viewType);
 			if(readOnlyEnum != null){
 				super.showView(readOnlyEnum, onReadyCallback);
 			}
 			else{
 				super.showView(viewType, onReadyCallback);
 			}
 		}
 	}
 	
 	public void setEditable(boolean editable){
 		if(editable && this.isEditable != true){
 			this.isEditable = editable;
 			for(View v: readOnlyViews){
 				createEditLink(v);
 			}
 		}
 		else if(!editable && this.isEditable == true){
 			this.isEditable = editable;
 			detachEditLinks();
 		}
 	}
 	
 	public void setEditMode(final boolean editMode){
 		if(this.editMode != editMode){
 			this.editMode = editMode;
 			this.showView(this.getCurrentViewEnum(), new Callback<Boolean>(){
 
 				@Override
 				public void exec(Boolean result) {
 					if(false){
 						MenuEditableSectionController.this.editMode = !editMode;
 					}
 				}
 			});
 		}
 	}
 	
 	public void addCommonEditButton(String parentMenu, KSButton button){
 		if(parentMenu != null){
 			List<View> views = menuViewMap.get(parentMenu);
 			if(views != null){
 				for(int i=0; i < views.size(); i++){
 					Enum<?> editEnum = readOnlyToEditMap.get(views.get(i).getViewEnum());
 					if(editEnum != null){
 						addButtonForView(editEnum, button);
 					}
 				}
 			}
 		}
 	}
 	
 }