package org.gcube.portlets.user.dataminermanager.client;

import java.util.List;

import org.gcube.data.analysis.dataminermanagercl.shared.data.OutputData;
import org.gcube.data.analysis.dataminermanagercl.shared.data.computations.ComputationData;
import org.gcube.data.analysis.dataminermanagercl.shared.data.computations.ComputationId;
import org.gcube.data.analysis.dataminermanagercl.shared.perspective.PerspectiveType;
import org.gcube.data.analysis.dataminermanagercl.shared.process.OperatorsClassification;
import org.gcube.data.analysis.dataminermanagercl.shared.workspace.DataMinerWorkArea;
import org.gcube.data.analysis.dataminermanagercl.shared.workspace.ItemDescription;
import org.gcube.portlets.user.dataminermanager.client.common.EventBusProvider;
import org.gcube.portlets.user.dataminermanager.client.events.CancelComputationExecutionRequestEvent;
import org.gcube.portlets.user.dataminermanager.client.events.CancelExecutionFromComputationsRequestEvent;
import org.gcube.portlets.user.dataminermanager.client.events.ComputationDataEvent;
import org.gcube.portlets.user.dataminermanager.client.events.ComputationDataRequestEvent;
import org.gcube.portlets.user.dataminermanager.client.events.DataMinerWorkAreaEvent;
import org.gcube.portlets.user.dataminermanager.client.events.DataMinerWorkAreaRequestEvent;
import org.gcube.portlets.user.dataminermanager.client.events.DeleteItemRequestEvent;
import org.gcube.portlets.user.dataminermanager.client.events.MenuEvent;
import org.gcube.portlets.user.dataminermanager.client.events.MenuSwitchEvent;
import org.gcube.portlets.user.dataminermanager.client.events.OperatorsClassificationEvent;
import org.gcube.portlets.user.dataminermanager.client.events.OperatorsClassificationRequestEvent;
import org.gcube.portlets.user.dataminermanager.client.events.OutputDataEvent;
import org.gcube.portlets.user.dataminermanager.client.events.OutputDataRequestEvent;
import org.gcube.portlets.user.dataminermanager.client.events.RefreshDataMinerWorkAreaEvent;
import org.gcube.portlets.user.dataminermanager.client.events.RemoveSelectedOperatorEvent;
import org.gcube.portlets.user.dataminermanager.client.events.ResubmitComputationExecutionEvent;
import org.gcube.portlets.user.dataminermanager.client.events.ResubmitComputationExecutionRequestEvent;
import org.gcube.portlets.user.dataminermanager.client.events.SessionExpiredEvent;
import org.gcube.portlets.user.dataminermanager.client.events.StartComputationExecutionEvent;
import org.gcube.portlets.user.dataminermanager.client.events.StartComputationExecutionRequestEvent;
import org.gcube.portlets.user.dataminermanager.client.monitor.StatusMonitor;
import org.gcube.portlets.user.dataminermanager.client.rpc.DataMinerPortletServiceAsync;
import org.gcube.portlets.user.dataminermanager.client.type.DataMinerWorkAreaElementType;
import org.gcube.portlets.user.dataminermanager.client.type.DataMinerWorkAreaEventType;
import org.gcube.portlets.user.dataminermanager.client.type.MenuType;
import org.gcube.portlets.user.dataminermanager.client.util.InfoMessageBox;
import org.gcube.portlets.user.dataminermanager.client.util.UtilsGXT3;
import org.gcube.portlets.user.dataminermanager.shared.Constants;
import org.gcube.portlets.user.dataminermanager.shared.exception.SessionExpiredServiceException;
import org.gcube.portlets.user.dataminermanager.shared.session.UserInfo;

import com.allen_sauer.gwt.log.client.Log;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.sencha.gxt.widget.core.client.event.HideEvent;
import com.sencha.gxt.widget.core.client.event.HideEvent.HideHandler;

/**
 * 
 * @author Giancarlo Panichi
 *
 *
 */
public class DataMinerManagerController {
	private UserInfo userInfo;
	private DataMinerWorkArea dataMinerWorkArea;
	private List<OperatorsClassification> operatorsClassifications;
	private MenuType currentVisualization;
	private String operatorId;

	public DataMinerManagerController() {
		init();
	}

	public UserInfo getUserInfo() {
		return userInfo;
	}

	public DataMinerWorkArea getDataMinerWorkArea() {
		return dataMinerWorkArea;
	}

	public String getOperatorId() {
		return operatorId;
	}

	private void init() {
		currentVisualization = MenuType.HOME;
		restoreUISession();
		bind();
		callHello();
		checkSession();
	}

	private void checkSession() {
		// if you do not need to something when the session expire
		// CheckSession.getInstance().startPolling();
	}

	private void sessionExpiredShow() {
		// CheckSession.showLogoutDialog();
	}

	/*
	 * private void sessionExpiredShowDelayed() { Timer timeoutTimer = new
	 * Timer() { public void run() { sessionExpiredShow();
	 * 
	 * } }; int TIMEOUT = 3; // 3 second timeout
	 * 
	 * timeoutTimer.schedule(TIMEOUT * 1000); // timeout is in milliseconds
	 * 
	 * }
	 */

	private void bind() {

		EventBusProvider.INSTANCE.addHandler(SessionExpiredEvent.TYPE,
				new SessionExpiredEvent.SessionExpiredEventHandler() {

					@Override
					public void onChange(SessionExpiredEvent event) {
						Log.debug("Catch SessionExpiredEvent");
						sessionExpiredShow();

					}
				});

		EventBusProvider.INSTANCE.addHandler(MenuEvent.TYPE, new MenuEvent.MenuEventHandler() {

			@Override
			public void onSelect(MenuEvent event) {
				Log.debug("Catch MenuEvent:" + event);
				manageMenuEvent(event);

			}
		});

		EventBusProvider.INSTANCE.addHandler(StartComputationExecutionRequestEvent.TYPE,
				new StartComputationExecutionRequestEvent.StartComputationExecutionRequestEventHandler() {

					@Override
					public void onStart(StartComputationExecutionRequestEvent event) {
						Log.debug("Catch StartComputationExecutionRequestEvent: " + event);
						startComputationRequest(event);

					}
				});

		EventBusProvider.INSTANCE.addHandler(CancelComputationExecutionRequestEvent.TYPE,
				new CancelComputationExecutionRequestEvent.CancelComputationExecutionRequestEventHandler() {

					@Override
					public void onCancel(CancelComputationExecutionRequestEvent event) {
						Log.debug("Catch CancelComputationRequestEvent: " + event);
						cancelComputationRequest(event);

					}
				});

		EventBusProvider.INSTANCE.addHandler(CancelExecutionFromComputationsRequestEvent.TYPE,
				new CancelExecutionFromComputationsRequestEvent.CancelExecutionFromComputationsRequestEventHandler() {

					@Override
					public void onCancel(CancelExecutionFromComputationsRequestEvent event) {
						Log.debug("Catch CancelExecutionFromComputationsRequestEvent: " + event);
						cancelExecutionFromComputationsRequest(event);

					}

				});

		EventBusProvider.INSTANCE.addHandler(ResubmitComputationExecutionRequestEvent.TYPE,
				new ResubmitComputationExecutionRequestEvent.ResubmitComputationExecutionRequestEventHandler() {

					@Override
					public void onResubmit(ResubmitComputationExecutionRequestEvent event) {
						Log.debug("Catch ResubmitComputationExecutionRequestEvent: " + event);
						resubmitComputationRequest(event);

					}

				});

		EventBusProvider.INSTANCE.addHandler(OutputDataRequestEvent.TYPE,
				new OutputDataRequestEvent.OutputDataRequestEventHandler() {

					@Override
					public void onOutputRequest(OutputDataRequestEvent event) {
						Log.debug("Catch OutputDataRequestEvent: " + event);
						manageOutputDataRequestEvent(event);

					}

				});

		EventBusProvider.INSTANCE.addHandler(ComputationDataRequestEvent.TYPE,
				new ComputationDataRequestEvent.ComputationDataRequestEventHandler() {

					@Override
					public void onComputationDataRequest(ComputationDataRequestEvent event) {
						Log.debug("Catch ComputationDataRequestEvent: " + event);
						manageComputationDataRequestEvent(event);

					}

				});

		EventBusProvider.INSTANCE.addHandler(OperatorsClassificationRequestEvent.TYPE,
				new OperatorsClassificationRequestEvent.OperatorsClassificationRequestEventHandler() {

					@Override
					public void onRequest(OperatorsClassificationRequestEvent event) {
						Log.debug("Catch OperatorsClassificationRequestEvent: " + event);
						operatorsClassificationRequest(event);

					}

				});

		EventBusProvider.INSTANCE.addHandler(DeleteItemRequestEvent.TYPE,
				new DeleteItemRequestEvent.DeleteItemRequestEventHandler() {

					@Override
					public void onDeleteRequest(DeleteItemRequestEvent event) {
						Log.debug("Catch DeleteItemRequestEvent: " + event);
						deleteItemRequest(event);

					}

				});

		EventBusProvider.INSTANCE.addHandler(DataMinerWorkAreaRequestEvent.TYPE,
				new DataMinerWorkAreaRequestEvent.DataMinerWorkAreaRequestEventHandler() {

					@Override
					public void onRequest(DataMinerWorkAreaRequestEvent event) {
						Log.debug("Catch DataMinerWorkAreaRequestEvent: " + event);
						retrieveDataMinerWorkArea(event);

					}

				});

	}

	private void restoreUISession() {
		// checkLocale();
		operatorId = com.google.gwt.user.client.Window.Location.getParameter(Constants.DATA_MINER_OPERATOR_ID);
	}

	private void callHello() {

		DataMinerPortletServiceAsync.INSTANCE.hello(new AsyncCallback<UserInfo>() {

			@Override
			public void onFailure(Throwable caught) {
				if (caught instanceof SessionExpiredServiceException) {
					UtilsGXT3.alert("Error", "Expired Session!");
					EventBusProvider.INSTANCE.fireEvent(new SessionExpiredEvent());
				} else {
					UtilsGXT3.alert("Error", "No user found: " + caught.getLocalizedMessage());
				}
			}

			@Override
			public void onSuccess(UserInfo result) {
				userInfo = result;
				Log.info("Hello: " + userInfo.getUsername());
			}

		});

	}

	private void manageMenuEvent(MenuEvent event) {
		Log.debug("CurrentVisualization=" + currentVisualization);
		if (event == null || event.getMenuType() == null
				|| (currentVisualization == null && event.getMenuType().compareTo(MenuType.HOME) == 0)
				|| (currentVisualization != null && event.getMenuType().compareTo(currentVisualization) == 0)) {

			return;
		}
		currentVisualization = event.getMenuType();
		MenuSwitchEvent menuSwitchEvent = new MenuSwitchEvent(event.getMenuType());
		EventBusProvider.INSTANCE.fireEvent(menuSwitchEvent);
	}

	private void startComputationRequest(final StartComputationExecutionRequestEvent event) {
		DataMinerPortletServiceAsync.INSTANCE.startComputation(event.getOp(), new AsyncCallback<ComputationId>() {

			@Override
			public void onFailure(Throwable caught) {
				if (caught instanceof SessionExpiredServiceException) {
					UtilsGXT3.alert("Error", "Expired Session!");
					EventBusProvider.INSTANCE.fireEvent(new SessionExpiredEvent());
				} else {
					UtilsGXT3.alert("Error", "Failed start computation " + event.getOp().getName() + "! "
							+ caught.getLocalizedMessage());
					caught.printStackTrace();
				}
			}

			@Override
			public void onSuccess(ComputationId computationId) {
				if (computationId == null)
					UtilsGXT3.alert("Error",
							"Failed start computation " + event.getOp().getName() + ", the computation id is null!");
				else {
					startComputation(computationId, event.getComputationStatusPanelIndex());
				}
			}
		});

	}

	private void startComputation(ComputationId computationId, int computationStatusPanelIndex) {
		StartComputationExecutionEvent event = new StartComputationExecutionEvent(computationId,
				computationStatusPanelIndex);
		EventBusProvider.INSTANCE.fireEvent(event);
	}

	private void cancelExecutionFromComputationsRequest(CancelExecutionFromComputationsRequestEvent event) {
		final ItemDescription itemDescription = event.getItemDescription();
		DataMinerPortletServiceAsync.INSTANCE.cancelComputation(itemDescription, new AsyncCallback<String>() {

			@Override
			public void onFailure(Throwable caught) {
				if (caught instanceof SessionExpiredServiceException) {
					UtilsGXT3.alert("Error", "Expired Session!");
					EventBusProvider.INSTANCE.fireEvent(new SessionExpiredEvent());
				} else {
					Log.error("Error in cancenExecutionFromComputations:" + caught.getLocalizedMessage());
					UtilsGXT3.alert("Error", "Error in cancel computation " + itemDescription.getName() + ": "
							+ caught.getLocalizedMessage());
				}

			}

			@Override
			public void onSuccess(String result) {
				Log.debug("Computation Cancelled!");
				final InfoMessageBox d = new InfoMessageBox("Info",
						"Computation cancellation request has been accepted!");
				d.addHideHandler(new HideHandler() {

					public void onHide(HideEvent event) {
						fireRefreshDataMinerWorkAreaEvent(DataMinerWorkAreaElementType.Computations);
					}
				});
				d.show();

			}
		});

	}

	private void cancelComputationRequest(CancelComputationExecutionRequestEvent event) {
		final ComputationId computationId = event.getComputationId();
		DataMinerPortletServiceAsync.INSTANCE.cancelComputation(computationId, new AsyncCallback<String>() {

			@Override
			public void onFailure(Throwable caught) {
				if (caught instanceof SessionExpiredServiceException) {
					UtilsGXT3.alert("Error", "Expired Session!");
					EventBusProvider.INSTANCE.fireEvent(new SessionExpiredEvent());
				} else {
					UtilsGXT3.alert("Error", "Error in cancel computation " + computationId.getId() + ": "
							+ caught.getLocalizedMessage());
				}

			}

			@Override
			public void onSuccess(String result) {
				Log.debug("Computation Cancelled!");

			}
		});
	}

	private void resubmitComputationRequest(final ResubmitComputationExecutionRequestEvent event) {
		currentVisualization = MenuType.EXPERIMENT;
		MenuSwitchEvent menuSwitchEvent = new MenuSwitchEvent(MenuType.EXPERIMENT);
		EventBusProvider.INSTANCE.fireEvent(menuSwitchEvent);

		DataMinerPortletServiceAsync.INSTANCE.resubmit(event.getItemDescription(), new AsyncCallback<ComputationId>() {

			@Override
			public void onFailure(Throwable caught) {
				if (caught instanceof SessionExpiredServiceException) {
					UtilsGXT3.alert("Error", "Expired Session!");
					EventBusProvider.INSTANCE.fireEvent(new SessionExpiredEvent());
				} else {
					UtilsGXT3.alert("Error", "Failed to resubmit computation: " + caught.getMessage());
				}
			}

			@Override
			public void onSuccess(ComputationId result) {
				if (result == null)
					UtilsGXT3.alert("Error", "Failed to resubmit computation, the computation id is null!");
				else {
					resubmitComputation(result);
				}

			}
		});
	}

	private void resubmitComputation(ComputationId computationId) {
		ResubmitComputationExecutionEvent event = new ResubmitComputationExecutionEvent(computationId);
		EventBusProvider.INSTANCE.fireEvent(event);
	}

	private void operatorsClassificationRequest(OperatorsClassificationRequestEvent event) {
		if (operatorsClassifications == null) {
			getOperatorsClassifications(event);
		} else {
			if (event.isRefresh()) {
				RemoveSelectedOperatorEvent rEvent=new RemoveSelectedOperatorEvent();
				EventBusProvider.INSTANCE.fireEvent(rEvent);
				getOperatorsClassifications(event);
			} else {
				organizesOperatorsClassification(event);
			}
		}

	}

	private void organizesOperatorsClassification(OperatorsClassificationRequestEvent event) {
		if (event.getOperatorsClassificationRequestType() == null) {
			return;
		}
		switch (event.getOperatorsClassificationRequestType()) {
		case ByName:
			getOperatorsClassificationByName(event);
			break;
		case Default:
			getOperatorsClassificationDefault(event);
			break;
		default:
			break;

		}
	}

	private void getOperatorsClassifications(final OperatorsClassificationRequestEvent event) {
		DataMinerPortletServiceAsync.INSTANCE.getOperatorsClassifications(event.isRefresh(),
				new AsyncCallback<List<OperatorsClassification>>() {

					@Override
					public void onSuccess(List<OperatorsClassification> result) {
						operatorsClassifications = result;
						organizesOperatorsClassification(event);
					}

					@Override
					public void onFailure(Throwable caught) {
						if (caught instanceof SessionExpiredServiceException) {
							UtilsGXT3.alert("Error", "Expired Session");
							EventBusProvider.INSTANCE.fireEvent(new SessionExpiredEvent());
						} else {
							UtilsGXT3.alert("Error",
									"Error retrieving operators classification! " + caught.getLocalizedMessage());
							Log.error("Error retrieving operators classification: " + caught.getLocalizedMessage());
							caught.printStackTrace();
						}
					}
				});
	}

	private void getOperatorsClassificationDefault(OperatorsClassificationRequestEvent event) {
		OperatorsClassification find = null;
		for (OperatorsClassification oc : operatorsClassifications) {
			if (oc.getName().equals(PerspectiveType.User.getPerspective())) {
				find = oc;
				break;
			}
		}

		OperatorsClassificationEvent ocEvent;
		if (event.isOperatorId()) {
			ocEvent = new OperatorsClassificationEvent(find, operatorId, event.isRefresh());
		} else {
			ocEvent = new OperatorsClassificationEvent(find, event.isRefresh());
		}
		EventBusProvider.INSTANCE.fireEvent(ocEvent);
	}

	private void getOperatorsClassificationByName(OperatorsClassificationRequestEvent event) {
		OperatorsClassification find = null;
		for (OperatorsClassification oc : operatorsClassifications) {
			if (oc.getName().equals(event.getPerspectiveType().getPerspective())) {
				find = oc;
				break;
			}
		}

		if (find == null) {
			for (OperatorsClassification oc : operatorsClassifications) {
				if (oc.getName().equals(PerspectiveType.User.getPerspective())) {
					find = oc;
					break;
				}
			}
		}

		OperatorsClassificationEvent ocEvent;
		if (event.isOperatorId()) {
			ocEvent = new OperatorsClassificationEvent(event.getPerspectiveType(), find, operatorId, event.isRefresh());
		} else {
			ocEvent = new OperatorsClassificationEvent(event.getPerspectiveType(), find, event.isRefresh());
		}
		EventBusProvider.INSTANCE.fireEvent(ocEvent);
	}

	private void retrieveDataMinerWorkArea(final DataMinerWorkAreaRequestEvent event) {
		final StatusMonitor monitor = new StatusMonitor();
		DataMinerPortletServiceAsync.INSTANCE.getDataMinerWorkArea(new AsyncCallback<DataMinerWorkArea>() {

			@Override
			public void onFailure(Throwable caught) {
				monitor.hide();
				if (caught instanceof SessionExpiredServiceException) {
					UtilsGXT3.alert("Error", "Expired Session");
					EventBusProvider.INSTANCE.fireEvent(new SessionExpiredEvent());
				} else {
					UtilsGXT3.alert("Error",
							"Error retrieving DataMiner work area info: " + caught.getLocalizedMessage());
				}
			}

			@Override
			public void onSuccess(DataMinerWorkArea result) {
				monitor.hide();
				Log.debug("DataMinerWorkArea: " + result);
				fireDataMinerWorkAreaEventRetrieved(event, result);

			}

		});

	}

	private void fireDataMinerWorkAreaEventRetrieved(DataMinerWorkAreaRequestEvent event, DataMinerWorkArea result) {
		dataMinerWorkArea = result;
		DataMinerWorkAreaEvent dataMinerWorkAreaEvent = new DataMinerWorkAreaEvent(DataMinerWorkAreaEventType.OPEN,
				event.getDataMinerWorkAreaRegionType(), result);
		EventBusProvider.INSTANCE.fireEvent(dataMinerWorkAreaEvent);
	}

	private void deleteItemRequest(final DeleteItemRequestEvent event) {
		final StatusMonitor monitor = new StatusMonitor();
		DataMinerPortletServiceAsync.INSTANCE.deleteItem(event.getItemDescription(), new AsyncCallback<Void>() {

			@Override
			public void onFailure(Throwable caught) {
				monitor.hide();
				if (caught instanceof SessionExpiredServiceException) {
					UtilsGXT3.alert("Error", "Expired Session");
					EventBusProvider.INSTANCE.fireEvent(new SessionExpiredEvent());
				} else {
					UtilsGXT3.alert("Error", "Error deleting item on workspace: " + caught.getLocalizedMessage());
				}
			}

			@Override
			public void onSuccess(Void result) {
				monitor.hide();
				Log.debug("Deleted Item!");
				fireRefreshDataMinerWorkAreaEvent(event.getDataMinerWorkAreaElementType());

			}

		});

	}

	private void fireRefreshDataMinerWorkAreaEvent(DataMinerWorkAreaElementType dataMinerWorkAreaElementType) {
		RefreshDataMinerWorkAreaEvent refreshEvent = new RefreshDataMinerWorkAreaEvent(dataMinerWorkAreaElementType);
		EventBusProvider.INSTANCE.fireEvent(refreshEvent);

	}

	private void manageOutputDataRequestEvent(OutputDataRequestEvent event) {
		if (event == null) {
			UtilsGXT3.alert("Error", "Invalid output request!");
		} else {
			if (event.getComputationId() == null || event.getComputationId().getId() == null
					|| event.getComputationId().getId().isEmpty()) {
				UtilsGXT3.alert("Error", "Invalid output request, computation id: " + event.getComputationId());
			} else {
				final StatusMonitor monitor = new StatusMonitor();
				DataMinerPortletServiceAsync.INSTANCE.getOutputDataByComputationId(event.getComputationId(),
						new AsyncCallback<OutputData>() {
							@Override
							public void onSuccess(OutputData outputData) {
								monitor.hide();
								fireOutputDataEvent(outputData);
							}

							@Override
							public void onFailure(Throwable caught) {
								monitor.hide();
								Log.error("Error in getResourceByComputationId: " + caught.getLocalizedMessage());
								UtilsGXT3.alert("Error",
										"Impossible to retrieve output info. " + caught.getLocalizedMessage());

							}
						});
			}
		}
	}

	private void fireOutputDataEvent(OutputData outputData) {
		OutputDataEvent event = new OutputDataEvent(outputData);
		EventBusProvider.INSTANCE.fireEvent(event);

	}

	private void manageComputationDataRequestEvent(ComputationDataRequestEvent event) {
		if (event == null) {
			UtilsGXT3.alert("Error", "Invalid computation info request!");
		} else {
			if (event.getItemDescription() == null || event.getItemDescription().getId() == null
					|| event.getItemDescription().getId().isEmpty()) {
				UtilsGXT3.alert("Error",
						"Invalid computation info request, item description: " + event.getItemDescription());
			} else {
				final StatusMonitor monitor = new StatusMonitor();
				DataMinerPortletServiceAsync.INSTANCE.getComputationData(event.getItemDescription(),
						new AsyncCallback<ComputationData>() {
							@Override
							public void onSuccess(ComputationData computationData) {
								monitor.hide();
								fireComputationDataEvent(computationData);
							}

							@Override
							public void onFailure(Throwable caught) {
								monitor.hide();
								Log.error("Error in getComputationData: " + caught.getLocalizedMessage());
								caught.printStackTrace();
								UtilsGXT3.alert("Error",
										"Impossible to retrieve computation info. " + caught.getLocalizedMessage());

							}
						});
			}
		}
	}

	private void fireComputationDataEvent(ComputationData computationData) {
		ComputationDataEvent event = new ComputationDataEvent(computationData);
		EventBusProvider.INSTANCE.fireEvent(event);

	}

}