/*
 * 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.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;

import eu.omp.irap.vespa.epntapclient.utils.Queries;
import eu.omp.irap.vespa.epntapclient.view.EpnTapMainView;
import eu.omp.irap.vespa.epntapclient.votable.controller.VOTableController;
import eu.omp.irap.vespa.epntapclient.votable.controller.VOTableException.CantDisplayVOTableException;
import eu.omp.irap.vespa.epntapclient.votable.controller.VOTableException.CantSendQueryException;
import eu.omp.irap.vespa.epntapclient.votable.utils.Const;

/**
 * The main controller which manage views and controllers.
 *
 * @author N. Jourdane
 */
public class EpnTapController implements ViewListener {

	/** 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;

	private String voTablePath;

	/**
	 * 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(this, servicesController.getView(),
				resultsController.getView());
		// 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 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);
	}

	/** Update the row selected by the user on the Services Panel. */
	@Override
	public void onServiceSelected(int selectedServiceRow) {
		String serviceURL = mainView.getServicesPanel().getServiceURL(selectedServiceRow);
		String tableName = mainView.getServicesPanel().getTableName(selectedServiceRow);
		if (!tableName.equals(selectedTableName)) {
			selectedTableServiceURL = serviceURL;
			selectedTableName = tableName;
			updateQueryArea();
			logger.info("Selected table: " + selectedTableName + " - service: "
					+ selectedTableServiceURL);
		}
	}

	/** Send the specified query on selectedTableServiceURL */
	@Override
	public void onSendButtonClicked(String query) {
		logger.info("Sending query: " + query + " on " + selectedTableServiceURL);
		try {
			voTablePath = resultsController.fillTable(selectedTableServiceURL, "ADQL", query);
		} catch (CantDisplayVOTableException e) {
			// TODO Create exception
			e.printStackTrace();
		} catch (CantSendQueryException e) {
			// TODO Create exception
			e.printStackTrace();
		}
	}

	/** Copy the VOTable to a specified location. */
	@Override
	public void onDownloadButtonClicked(File outputFile) {
		try {
			Files.copy(Paths.get(voTablePath), Paths.get(outputFile.getAbsolutePath()));
		} catch (IOException e) {
			// TODO Create exception
			e.printStackTrace();
		}
	}

	/** Update a query parameter in the parameter list. */
	@Override
	public void onParameterChanged(String paramName, Object paramValue) {
		paramValues.put(paramName, paramValue);
		updateQueryArea();
		logger.info("uploaded " + paramName + ": " + paramValue);
	}

	/** Remove a query parameter from the parameters list. */
	@Override
	public void onParameterRemoved(String paramName) {
		paramValues.remove(paramName);
		updateQueryArea();
		logger.info("removed " + paramName);
	}
}