/*
 * 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.gui;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.swing.JOptionPane;

import eu.omp.irap.vespa.epntapclient.EpnTapController;
import eu.omp.irap.vespa.epntapclient.service.Queries;
import eu.omp.irap.vespa.votable.controller.CantGetVOTableException;

/**
 * @author N. Jourdane
 */
public class GUIController extends EpnTapController implements ViewListener {

	/** The logger for the class GUIController. */
	private static final Logger logger = Logger.getLogger(GUIController.class.getName());

	private EpnTapMainView mainView;

	private String voTablePath;

	/** 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 int nbMaxResult = 10;


	public GUIController() {
		super();
		mainView = new EpnTapMainView(this);
	}

	@Override
	public void readServices() {
		try {
			servicesCtrl.readTable();
		} catch (CantGetVOTableException e) {
			displayError("Can not get services.", e);
		}
		mainView.getServicesPanel().fillTable(servicesCtrl.getVOTableData());
	}

	public EpnTapMainView getView() {
		return mainView;
	}

	/** Update the row selected by the user on the Services Panel. */
	@Override
	public void onServiceSelected(int selectedServiceRow) {
		String url = mainView.getServicesPanel().getServiceURL(selectedServiceRow);
		String tableName = mainView.getServicesPanel().getTableName(selectedServiceRow);
		updateService(url, tableName);
	}

	/** Send the specified query on selectedTableServiceURL */
	@Override
	public void onSendButtonClicked(String query) {
		GUIController.logger.info("Sending query: " + query + " on " + selectedTableServiceURL);
		try {
			voTablePath = sendQuery(query, selectedTableServiceURL);
		} catch (CantGetVOTableException e) {
			displayError("Can not send the query.", e);
			GUIController.logger.log(Level.WARNING, "Can not send query.", e);
		}

		mainView.getResultsPanel().fillTable(resultsCtrl.getVOTableData());
	}

	@Override
	public void displayError(String message, Exception e) {
		logger.log(Level.SEVERE, message, e);
		JOptionPane.showMessageDialog(mainView, e.getMessage(), message, JOptionPane.ERROR_MESSAGE);
	}

	/** 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
			mainView.displayError("Can not save the file.",
					"Check that you can write on the specified directory.");
			GUIController.logger.log(Level.WARNING, "Can not save the file.", e);
		}
	}

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

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

	/**
	 * Update the query area with a working ADQL query, based on the parameters list.
	 */
	private void updateQueryArea() {
		String query = Queries.getQuery(selectedTableName, paramValues, getNbMaxResult());
		mainView.getRequestPanel().updateQueryArea(query);
	}

	/**
	 * @return the nb max of result
	 */
	public int getNbMaxResult() {
		return nbMaxResult;
	}
	
	/**
	 * set the nb max of result for a query
	 */
	public void setNbMaxResult(int nb) {
		nbMaxResult = nb;
	}

	public void updateService(String serviceURL, String tableName) {
		if (!tableName.equals(selectedTableName)) {
			selectedTableServiceURL = serviceURL;
			selectedTableName = tableName;
			updateQueryArea();
			GUIController.logger.info("Selected table: " + selectedTableName + " - service: "
					+ selectedTableServiceURL);
		}
	}

}