/**
 * 
 */
package org.gcube.portlets.user.dataminermanager.client.form;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.gcube.portlets.user.dataminermanager.client.DataMinerManager;
import org.gcube.portlets.user.dataminermanager.client.bean.parameters.Parameter;
import org.gcube.portlets.user.dataminermanager.client.rpc.DataMinerPortletServiceAsync;
import org.gcube.portlets.user.dataminermanager.client.util.UtilsGXT3;
import org.gcube.portlets.user.dataminermanager.shared.exception.ExpiredSessionServiceException;
import org.gcube.portlets.user.dataminermanager.shared.workspace.ItemDescription;
import org.gcube.portlets.widgets.wsexplorer.client.notification.WorkspaceExplorerSelectNotification.WorskpaceExplorerSelectNotificationListener;
import org.gcube.portlets.widgets.wsexplorer.client.select.WorkspaceExplorerSelectDialog;
import org.gcube.portlets.widgets.wsexplorer.shared.Item;
import org.gcube.portlets.widgets.wsexplorer.shared.ItemType;

import com.allen_sauer.gwt.log.client.Log;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Widget;
import com.sencha.gxt.core.client.dom.XDOM;
import com.sencha.gxt.core.client.util.Format;
import com.sencha.gxt.widget.core.client.button.TextButton;
import com.sencha.gxt.widget.core.client.container.HorizontalLayoutContainer;
import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer;
import com.sencha.gxt.widget.core.client.event.SelectEvent;

/**
 * 
 * @author Giancarlo Panichi
 * email: <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
 *
 */
public class FileFld extends AbstractFld {

	private VerticalLayoutContainer vp;

	// FileSelector fileSelector;
	private WorkspaceExplorerSelectDialog wselectDialog;
	private TextButton selectButton, selectButton2, cancelButton;
	private ItemDescription selectedFileItem = null;

	/**
	 * @param parameter
	 */
	public FileFld(Parameter parameter) {
		super(parameter);
		vp=new VerticalLayoutContainer();
		/*
		 * fileSelector = new FileSelector() {
		 * 
		 * @Override public void fireSelection(TableItemSimple fileItem) {
		 * super.fireSelection(fileItem); selectedFileItem = fileItem;
		 * showFieldWithSelection(); } };
		 */

		List<ItemType> selectableTypes = new ArrayList<ItemType>();
		selectableTypes.add(ItemType.EXTERNAL_FILE);
		List<ItemType> showableTypes = new ArrayList<ItemType>();
		showableTypes.addAll(Arrays.asList(ItemType.values()));

		wselectDialog = new WorkspaceExplorerSelectDialog("Select CSV", false);
		// filterCriteria, selectableTypes);

		WorskpaceExplorerSelectNotificationListener handler = new WorskpaceExplorerSelectNotificationListener() {

			@Override
			public void onSelectedItem(Item item) {

				if (item.isFolder() || item.isRoot()) {
					UtilsGXT3.info("Attention", "Select a valid csv!");

				} else {
					retrieveFileInformation(item);

				}

			}

			@Override
			public void onFailed(Throwable throwable) {
				Log.error("Error in create project: "
						+ throwable.getLocalizedMessage());
				UtilsGXT3.alert("Error", throwable.getLocalizedMessage());
				throwable.printStackTrace();
			}

			@Override
			public void onAborted() {

			}

			@Override
			public void onNotValidSelection() {
				UtilsGXT3.info("Attention", "Select a valid csv!");
			}
		};

		wselectDialog.addWorkspaceExplorerSelectNotificationListener(handler);
		wselectDialog.setZIndex(XDOM.getTopZIndex());

		selectButton = new TextButton("Select File");
		selectButton.setIcon(DataMinerManager.resources.folderExplore());	
		selectButton.addSelectHandler(new SelectEvent.SelectHandler() {
			
			@Override
			public void onSelect(SelectEvent event) {
				wselectDialog.show();
				
			}
		});
		selectButton.setToolTip("Select File");

		
		
		selectButton2 = new TextButton("");	
		selectButton2.setIcon(DataMinerManager.resources.folderExplore());
		selectButton2.addSelectHandler(new SelectEvent.SelectHandler() {
			
			@Override
			public void onSelect(SelectEvent event) {
				wselectDialog.show();
			}
		});
		selectButton2.setToolTip("Select Another File");

		cancelButton = new TextButton("");
		cancelButton.setIcon(DataMinerManager.resources.cancel());
		cancelButton.addSelectHandler(new SelectEvent.SelectHandler() {
			
			@Override
			public void onSelect(SelectEvent event) {
				selectedFileItem = null;
				showNoSelectionField();
			}
		});

		showNoSelectionField();
	}

	private void retrieveFileInformation(final Item item) {
		Log.debug("Retrieved: " + item);
		final ItemDescription itemDescription = new ItemDescription(item.getId(),
				item.getName(), item.getOwner(), item.getPath(), item.getType()
						.name());

		DataMinerPortletServiceAsync.INSTANCE.getPublicLink(itemDescription,
				new AsyncCallback<String>() {

					@Override
					public void onFailure(Throwable caught) {
						Log.error("Error in retrieveFileInformation: "
								+ caught.getMessage());
						if (caught instanceof ExpiredSessionServiceException) {
							UtilsGXT3.alert("Error", "Expired Session");
							// sessionExpiredShowDelayed();

						} else {
							UtilsGXT3.alert(
									"Error",
									"Error retrieving file informations: "
											+ caught.getLocalizedMessage());
						}

					}

					@Override
					public void onSuccess(String result) {
						itemDescription.setPublicLink(result);
						selectedFileItem = itemDescription;
						Log.debug("SelectedFileItem: " + selectedFileItem);
						showFieldWithSelection();

					}
				});

		

	}

	private void showNoSelectionField() {
		vp.clear();
		vp.add(selectButton);
		vp.forceLayout();
	}

	private void showFieldWithSelection() {
		// final String fileId = selectedFileItem.getId();
		final String fileName = selectedFileItem.getName();

		vp.clear();
		HorizontalLayoutContainer hp = new HorizontalLayoutContainer();
		hp.add(new HTML("<div class='workflow-parameters-tableDescription'>"
				+ Format.ellipse(fileName, 30) + "</div>"));
		hp.add(selectButton2);
		hp.add(cancelButton);
		vp.add(hp);
		vp.forceLayout();
	}

	/**
	 * 
	 */
	@Override
	public boolean isValid() {
		return (selectedFileItem != null);
	}

	@Override
	public Widget getWidget() {
		return vp;
	}

	@Override
	public String getValue() {
		return (selectedFileItem == null) ? null : selectedFileItem.getPublicLink();
	}

}