package org.gcube.portlets.widgets.wstaskexecutor.client;

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

import org.gcube.common.workspacetaskexecutor.shared.dataminer.TaskConfiguration;
import org.gcube.common.workspacetaskexecutor.shared.exception.ItemNotConfiguredException;
import org.gcube.common.workspacetaskexecutor.shared.exception.WorkspaceFolderLocked;
import org.gcube.portlets.widgets.wstaskexecutor.client.TaskCompletedNotification.TaskCompletedNotificationListner;
import org.gcube.portlets.widgets.wstaskexecutor.client.event.PerformRunTaskEvent;
import org.gcube.portlets.widgets.wstaskexecutor.client.event.PerformRunTaskEventHandler;
import org.gcube.portlets.widgets.wstaskexecutor.client.rpc.WsTaskExecutorWidgetServiceAsync;
import org.gcube.portlets.widgets.wstaskexecutor.client.view.LoaderIcon;
import org.gcube.portlets.widgets.wstaskexecutor.client.view.WsTaskExecutorWidgetViewManager;
import org.gcube.portlets.widgets.wstaskexecutor.client.view.binder.MonitorFolderTaskExecutionStatusView;
import org.gcube.portlets.widgets.wstaskexecutor.shared.WsFolder;

import com.github.gwtbootstrap.client.ui.Alert;
import com.github.gwtbootstrap.client.ui.Modal;
import com.github.gwtbootstrap.client.ui.constants.AlertType;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.VerticalPanel;


/**
 * Entry point classes define <code>onModuleLoad()</code>.
 *
 * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
 * May 4, 2018
 */
public class WsTaskExecutorWidget {

	/**
	 * The message displayed to the user when the server cannot be reached or
	 * returns an error.
	 */
	private static final String SERVER_ERROR = "An error occurred while "
		+ "attempting to contact the server. Please check your network "
		+ "connection and try again.";
	/**
	 * Create a remote service proxy to talk to the server-side Greeting
	 * service.
	 */
	public static final WsTaskExecutorWidgetServiceAsync wsTaskService = WsTaskExecutorWidgetServiceAsync.Util.getInstance();

	/** The Constant eventBus. */
	public final static HandlerManager eventBus = new HandlerManager(null);

	private WsTaskExecutorWidgetViewManager viewManager = new WsTaskExecutorWidgetViewManager();

	private final List<TaskCompletedNotificationListner> taskEventsListeners = new ArrayList<TaskCompletedNotificationListner>();

	/**
	 * Instantiates a new ws task executor widget.
	 */
	public WsTaskExecutorWidget() {
		bindEvents();
		// TODO Auto-generated constructor stub
	}

	/**
	 * Bind events.
	 */
	private void bindEvents() {

		eventBus.addHandler(PerformRunTaskEvent.TYPE, new PerformRunTaskEventHandler() {

			@Override
			public void onPerformRunTask(PerformRunTaskEvent perforRunTaskEvent) {

				try {
					performRunTask(perforRunTaskEvent.getFolder(), perforRunTaskEvent.getConf());
				}
				catch (Exception e) {
					Window.alert(e.getMessage());
				}
			}
		});

	}


	/**
	 * Perform run task.
	 *
	 * @param folder the folder
	 * @param conf the conf
	 * @throws Exception the exception
	 */
	public void performRunTask(WsFolder folder, TaskConfiguration conf) throws Exception {

		if(folder==null || folder.getFolderId()==null)
			throw new Exception("Invalid parameter folder null");

		if(conf==null)
			throw new Exception("Invalid parameter the configuration is null");


		//WsTaskExecutorWidget.wsTaskService.runTask()
	}


	/**
	 * Show task configurations for folder.
	 *
	 * @param folder the folder
	 * @throws Exception the exception
	 */
	public void showTaskConfigurationsForFolder(final WsFolder folder) throws Exception {

		if(folder==null || folder.getFolderId()==null)
			throw new Exception("Invalid parameter folder null");


		MonitorFolderTaskExecutionStatusView monitor = viewManager.getMonitor(folder);

		//SHOWING CURRENT ACTIVE MONITOR
		if(monitor!=null) {
			GWT.log("Monitor for folder: "+folder.getFolderId() +" exists showing it..");
			viewManager.showMonitorTaskStatusFor(folder, monitor.getTaskConfiguration(), monitor.getTaskComputation(), taskEventsListeners);
			return;
		}

		final Modal box = new Modal(true);
		box.setTitle("Checking configurations...");
		LoaderIcon loader = new LoaderIcon("Checking folder configurations...");
		box.add(loader);

		GWT.log("Performing checkItemTaskConfigurations: "+folder.getFolderId());

		WsTaskExecutorWidget.wsTaskService.checkItemTaskConfigurations(folder.getFolderId(), new AsyncCallback<List<TaskConfiguration>>() {

			@Override
			public void onSuccess(List<TaskConfiguration> result) {

				viewManager.showTaskConfigurationsFolderInfo(folder, result, taskEventsListeners);
			}

			@Override
			public void onFailure(Throwable caught) {

				if(caught instanceof ItemNotConfiguredException){

					viewManager.showCreateTaskConfigurationForFolder(folder, null);

				}else if(caught instanceof WorkspaceFolderLocked){
					VerticalPanel v = new VerticalPanel();
					Alert alert = new Alert("Current Folder is locked by another proccess. Do you want see Task status?");
					alert.setClose(true);
					alert.setType(AlertType.INFO);

					Button butt = new Button("Show Status");
					butt.addClickHandler(new ClickHandler() {

						@Override
						public void onClick(ClickEvent event) {
							//WsThreddsWidget.eventBus.fireEvent(new ShowMonitorSyncStatusEvent(folder));
						}
					});

					v.add(alert);
					v.add(butt);
					box.add(v);
				}

				Window.alert(caught.getMessage());

			}
		});

		box.show();

	}
}