/**
 * 
 */
package org.gcube.portlets.widgets.wsexplorer.client;

import java.util.List;

import org.gcube.portlets.widgets.wsexplorer.client.event.ClickItemEvent;
import org.gcube.portlets.widgets.wsexplorer.client.event.ClickItemEventHandler;
import org.gcube.portlets.widgets.wsexplorer.client.event.LoadFolderEvent;
import org.gcube.portlets.widgets.wsexplorer.client.event.LoadFolderEventHandler;
import org.gcube.portlets.widgets.wsexplorer.client.event.LoadMySpecialFolderEvent;
import org.gcube.portlets.widgets.wsexplorer.client.event.LoadMySpecialFolderEventHandler;
import org.gcube.portlets.widgets.wsexplorer.client.event.LoadRootEvent;
import org.gcube.portlets.widgets.wsexplorer.client.event.LoadRootEventHandler;
import org.gcube.portlets.widgets.wsexplorer.client.resources.WorkspaceExplorerResources;
import org.gcube.portlets.widgets.wsexplorer.client.rpc.WorkspaceExplorerService;
import org.gcube.portlets.widgets.wsexplorer.client.rpc.WorkspaceExplorerServiceAsync;
import org.gcube.portlets.widgets.wsexplorer.client.view.Breadcrumbs;
import org.gcube.portlets.widgets.wsexplorer.client.view.Navigation;
import org.gcube.portlets.widgets.wsexplorer.client.view.WorkspaceExplorer;
import org.gcube.portlets.widgets.wsexplorer.shared.Item;
import org.gcube.portlets.widgets.wsexplorer.shared.ItemCategory;
import org.gcube.portlets.widgets.wsexplorer.shared.ItemType;

import com.github.gwtbootstrap.client.ui.Alert;
import com.github.gwtbootstrap.client.ui.constants.AlertType;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.dom.client.Style.VerticalAlign;
import com.google.gwt.event.shared.EventHandler;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.Label;


/**
 * The Class WorkspaceExplorerController.
 *
 * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
 * Jun 25, 2015
 */
public class WorkspaceExplorerController implements EventHandler {
	
	public final static HandlerManager eventBus = new HandlerManager(null);
	private WorkspaceExplorerPanel workspaceExplorerPanel;
	private WorkspaceExplorer wsExplorer;
	private Breadcrumbs breadcrumbs = new Breadcrumbs();
	private Navigation navigation = new Navigation();

	public static final WorkspaceExplorerServiceAsync workspaceNavigatorService = GWT.create(WorkspaceExplorerService.class);
	
	/**
	 * Instantiates a new workspace explorer controller.
	 */
	public WorkspaceExplorerController(){
		bindEvents();
		wsExplorer = new WorkspaceExplorer();
		workspaceExplorerPanel = new WorkspaceExplorerPanel(5, wsExplorer.getPanel(), breadcrumbs, navigation);
	}
	
//	public void loadRoot(){
//		wsExplorer.loadRoot();
//	}
	
	/**
	 * Bind events.
	 */
	private void bindEvents() {
		
		eventBus.addHandler(LoadFolderEvent.TYPE, new LoadFolderEventHandler() {
			
			@Override
			public void onLoadFolder(LoadFolderEvent loadFolderEvent) {
				
				if(loadFolderEvent.getTargetItem()!=null && loadFolderEvent.getTargetItem().isFolder()){
					wsExplorer.loadFolder(loadFolderEvent.getTargetItem());
					loadParentBreadcrumbByItemId(loadFolderEvent.getTargetItem().getId(), true);
					clearMoreInfo();
				}
			}
		});
		
		eventBus.addHandler(LoadRootEvent.TYPE, new LoadRootEventHandler() {
			
			@Override
			public void onLoadRoot(LoadRootEvent loadRootEvent) {
				wsExplorer.loadRoot();
				
				workspaceNavigatorService.getItemByCategory(ItemCategory.HOME, new AsyncCallback<Item>() {

					@Override
					public void onFailure(Throwable caught) {
						GWT.log(caught.getMessage());
						breadcrumbs.clear();
						
					}

					@Override
					public void onSuccess(Item result) {
						result.setName(WorkspaceExplorerConstants.HOME_LABEL); //FORCE SET NAME LIKE "HOME_LABEL"
						breadcrumbs.init(result);
						clearMoreInfo();
					}
				});
			}
		});
		
		eventBus.addHandler(ClickItemEvent.TYPE, new ClickItemEventHandler() {
			
			@Override
			public void onClick(final ClickItemEvent clickItemEvent) {
				
				Item item = clickItemEvent.getItem();
				if(item!=null){
					updateMoreInfo(item);
				}
				
			}
		});
		
		eventBus.addHandler(LoadMySpecialFolderEvent.TYPE, new LoadMySpecialFolderEventHandler() {
			
			@Override
			public void onLoadMySpecialFolder(LoadMySpecialFolderEvent loadMySpecialFolderEvent) {
				wsExplorer.loadMySpecialFolder();

				workspaceNavigatorService.getItemByCategory(ItemCategory.VRE_FOLDER, new AsyncCallback<Item>() {

					@Override
					public void onFailure(Throwable caught) {
						GWT.log(caught.getMessage());
					}

					@Override
					public void onSuccess(Item result) {
						breadcrumbs.init(result);
						clearMoreInfo();
					}
				});
			}
		});
	}

	/**
	 * Load parent breadcrumb by item id.
	 *
	 * @param itemIdentifier the item identifier
	 * @param includeItemAsParent the include item as parent
	 */
	protected void loadParentBreadcrumbByItemId(final String itemIdentifier, boolean includeItemAsParent){

		GWT.log("Reload Parent Breadcrumb: [Item id: "+itemIdentifier+"]");

		workspaceNavigatorService.getBreadcrumbsByItemIdentifier(itemIdentifier, includeItemAsParent, new AsyncCallback<List<Item>>() {

			@Override
			public void onFailure(Throwable caught) {
				GWT.log(caught.getMessage());
				wsExplorer.setAlert(caught.getMessage(), AlertType.ERROR);
			}

			@Override
			public void onSuccess(List<Item> result) {
				if(result!=null){
					breadcrumbs.setPath(result);
					clearMoreInfo();
				}
			}
		});
	}
	
	private void clearMoreInfo(){
		workspaceExplorerPanel.getSouthPanel().clear();
	}
	
	private void updateMoreInfo(Item item){
		
		if(item!=null){
			workspaceExplorerPanel.getSouthPanel().clear();
			Alert alert = new Alert();
			alert.addStyleName("alert-custom");
			
			final HorizontalPanel hp = new HorizontalPanel();
			Image iconInfo = WorkspaceExplorerResources.getIconInfo().createImage();
			iconInfo.getElement().getStyle().setVerticalAlign(VerticalAlign.MIDDLE);
			hp.add(WorkspaceExplorerResources.getIconInfo().createImage());
			final Label labelName = new Label("Name: "+item.getName());
			double marginValue = 10.0;
			labelName.getElement().getStyle().setMarginLeft(marginValue, Unit.PX);
			labelName.getElement().getStyle().setMarginRight(marginValue, Unit.PX);
			final Label labelSize = new Label("Size: ");
			labelSize.getElement().getStyle().setMarginRight(marginValue, Unit.PX);
			final Label labelMime = new Label("Mime Type: ");
			labelMime.getElement().getStyle().setMarginRight(marginValue, Unit.PX);
			final Label labelACL = new Label("Rights: ");
			labelACL.getElement().getStyle().setMarginRight(marginValue, Unit.PX);
			hp.add(labelName);
			hp.add(labelSize);
			if(!item.isFolder())
				hp.add(labelMime);
			hp.add(labelACL);
			workspaceNavigatorService.getReadableSizeByItemId(item.getId(), new AsyncCallback<String>() {

				@Override
				public void onFailure(Throwable caught) {
				}

				@Override
				public void onSuccess(String result) {
					labelSize.setText("Size: " +result);
				}
			});
			
			if(!item.isFolder()){
				workspaceNavigatorService.getMimeType(item.getId(), new AsyncCallback<String>() {

					@Override
					public void onFailure(Throwable caught) {
					}

					@Override
					public void onSuccess(String result) {
						if(result!=null)
							labelMime.setText("Mime Type: "+result);
					}
				});
			}
			
			workspaceNavigatorService.getUserACLForFolderId(item.getId(), new AsyncCallback<String>() {

				@Override
				public void onFailure(Throwable caught) {
				}

				@Override
				public void onSuccess(String result) {
					labelACL.setText("Rights: "+result);
				}
			});
			alert.add(hp);
			alert.setType(AlertType.DEFAULT);
			alert.setClose(false);
			workspaceExplorerPanel.getSouthPanel().add(alert);		}
	}
	
	/**
	 * @return the breadcrumbs
	 */
	public Breadcrumbs getBreadcrumbs() {
		return breadcrumbs;
	}

	/**
	 * Gets the workspace explorer panel.
	 *
	 * @return the workspaceExplorerPanel
	 */
	public WorkspaceExplorerPanel getWorkspaceExplorerPanel() {
		return workspaceExplorerPanel;
	}

	/**
	 * @return the wsExplorer
	 */
	public WorkspaceExplorer getWsExplorer() {
		return wsExplorer;
	}

	/**
	 * @param selectableTypes
	 */
	public void setSelectableTypes(ItemType[] selectableTypes) {
		wsExplorer.setSelectableTypes(selectableTypes);
	}
	
	/**
	 * @return the selectableTypes
	 */
	public List<ItemType> getSelectableTypes() {
		return wsExplorer.getSelectableTypes();
	}

	/**
	 * @return
	 */
	public List<ItemType> getShowableTypes() {
		return wsExplorer.getShowableTypes();
	}

	/**
	 * @param showableTypes
	 */
	public void setShowableTypes(ItemType[] showableTypes) {
		wsExplorer.setShowableTypes(showableTypes);
	}
}