/*
 * This file is a part of EpnTAPClient.
 * This program aims to provide EPN-TAP support for software clients, like CASSIS spectrum analyzer.
 * See draft specifications: https://voparis-confluence.obspm.fr/pages/viewpage.action?pageId=559861
 * Copyright (C) 2016 Institut de Recherche en Astrophysique et Planétologie.
 * 
 * This program is free software: you can
 * redistribute it and/or modify it under the terms of the GNU General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or (at your option) any later
 * version. This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE. See the GNU General Public License for more details. You should have received a copy of
 * the GNU General Public License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 */

package eu.omp.irap.vespa.epntapclient.controller;

import java.util.HashMap;
import java.util.Map;
import java.util.logging.Level;

import java.util.logging.Logger;

import eu.omp.irap.vespa.epntapclient.utils.Const;

import eu.omp.irap.vespa.epntapclient.utils.Queries;

import eu.omp.irap.vespa.epntapclient.view.EpnTapMainView;

import eu.omp.irap.vespa.epntapclient.view.EpnTapMainView.MainViewListener;
import eu.omp.irap.vespa.epntapclient.view.Event;

import eu.omp.irap.vespa.epntapclient.votable.controller.VOTableController;

import eu.omp.irap.vespa.epntapclient.votable.controller.VOTableException;

/**

 * The main controller which manage views and controllers.
 * 

 * @author N. Jourdane
 */

public class EpnTapController implements MainViewListener {

	/** The logger for the class EpnTapController. */

	private Logger logger = Logger.getLogger(EpnTapController.class.getName());

	/** The view of EPN-TAP application. */

	private EpnTapMainView mainView;

	/** The controller of the VOTable displaying the list of services. */

	private VOTableController servicesController;

	/** The controller of the VOTable displaying the query results. */

	private VOTableController resultsController;

	/** The name of the table selected by the user on the table list panel. */

	private String selectedTableName;

	/** The URL of the service corresponding to the selected table. */

	private String selectedTableServiceURL;

	/**

	 * The parameters fields for the request.
	 */
	private Map<String, Object> paramValues = new HashMap<>();

	/**

	 * Method constructor, which initialize servicesController, resultsController and mainView.

	 */
	public EpnTapController() {

		servicesController = new VOTableController(Const.DEFAULT_REGISTRY_URL, "ADQL",

				Queries.GET_EPN_TAP_SERVICES);

		resultsController = new VOTableController();

		mainView = new EpnTapMainView(servicesController.getView(), resultsController.getView());

		mainView.addMainViewListener(this);

		updateSelected(0);

	}

	/**

	 * @return the EPN-TAP main view.

	 */
	public EpnTapMainView getView() {

		return mainView;

	}

	/**

	 * @return The controller of the VOTable which displays the result of the query.

	 */
	public VOTableController getResultsController() {
		return resultsController;
	}

	/**

	 * @return The controller of the VOTable which displays the list of services.

	 */
	public VOTableController getServicesController() {
		return servicesController;
	}

	/**

	 * Update the row selected by the user on the Services Panel.
	 * 

	 * @param row The row selected by the user on the Jtable.
	 */

	public void updateSelected(int row) {

		String serviceURL = mainView.getServicesPanel().getServiceURL(row);
		String tableName = mainView.getServicesPanel().getTableName(row);

		if (!tableName.equals(selectedTableName)) {
			selectedTableServiceURL = serviceURL;
			selectedTableName = tableName;

			updateQueryArea();

			logger.info("Selected table: " + selectedTableName + " - service: "
					+ selectedTableServiceURL);

		}
	}

	/**
	 * Remove a query parameter from the parameters list.
	 * 
	 * @param paramName The name of the parameter as described in REG-TAP specifications.
	 */

	public void removeParameter(String paramName) {
		paramValues.remove(paramName);
		updateQueryArea();
		logger.info("removed " + paramName);
	}

	/**
	 * Update a query parameter in the parameter list.
	 * 
	 * @param paramName The name of the parameter as described in REG-TAP specifications.
	 * @param value The value of the parameter to update.
	 */

	public void updateParameter(String paramName, Object value) {
		paramValues.put(paramName, value);
		updateQueryArea();
		logger.info("uploaded " + paramName + ": " + value);
	}

	/**
	 * Update the query area with a working ADQL query, based on the parameters list.
	 */

	private void updateQueryArea() {
		String query = Queries.getQuery(selectedTableName, paramValues, 10);
		mainView.getRequestPanel().updateQueryArea(query);

	}

	/**

	 * Send a query to the selected service on the services panel.
	 * 

	 * @param query The query to send to the selected service.

	 * @throws VOTableException Can not fill the Table

	 */

	public void sendQuery(String query) throws VOTableException {

		logger.info("Sending query: " + query + " on " + selectedTableServiceURL);
		resultsController.fillTable(selectedTableServiceURL, "ADQL", query);

	}

	/**

	 * This methods is called each time a graphical event is detected from a view.
	 * 
	 * @param event The type of the detected event. @see Event
	 * @param args The possible arguments which comes with the event (ie. a row column).

	 */

	@Override
	public void event(Event event, Object... args) {

		logger.info("new event: " + event.toString());

		try {

			Object object = args[0];

			switch (event) {

			case SERVICE_SELECTED:

				updateSelected(((Integer) args[0]).intValue());

				break;

			case SEND_BUTTON_CLICKED:

				sendQuery((String) object);

				break;

			case PARAMETER_CHANGED:

				updateParameter((String) object, args[1]);

				break;

			case PARAMETER_REMOVED:

				removeParameter((String) object);

				break;
			default:
				logger.warning("Event " + event.toString() + " detected but is not implemented.");
			}
		} catch (Exception e) {

			mainView.displayError("Error", e.getMessage());
			logger.log(Level.WARNING,

					"Exception thrown when " + event.toString() + ": " + e.getMessage(), e);

		}
	}

}