/**

 * SQL-DK

 * Copyright © 2013 František Kučera (frantovo.cz)

 *

 * 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 info.globalcode.sql.dk;

import info.globalcode.sql.dk.configuration.ConfigurationException;

import info.globalcode.sql.dk.configuration.ConfigurationProvider;

import info.globalcode.sql.dk.configuration.DatabaseDefinition;

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.io.PrintStream;

import java.sql.SQLException;

import java.util.EnumSet;

import java.util.List;

import java.util.logging.Level;

import java.util.logging.Logger;

/**

 * Displays info like help, version etc.

 *

 * @author Ing. František Kučera (frantovo.cz)

 */

public class InfoLister {

	private static final Logger log = Logger.getLogger(InfoLister.class.getName());

	private PrintStream out;

	private ConfigurationProvider configurationProvider;

	public InfoLister(PrintStream out, ConfigurationProvider configurationProvider) {

		this.out = out;

		this.configurationProvider = configurationProvider;

	}

	public void showInfo(CLIOptions options) throws ConfigurationException {

		EnumSet<CLIOptions.INFO_TYPE> infoTypes = options.getShowInfo();

		for (CLIOptions.INFO_TYPE infoType : infoTypes) {

			switch (infoType) {

				/**

				 * TODO: implement show info

				 */

				case FORMATTERS:

					println("TODO: list available formatters");

					break;

				case HELP:

					printResource(Constants.HELP_FILE);

					break;

				case LICENSE:

					printResource(Constants.LICENSE_FILE);

					break;

				case TYPES:

					println("TODO: list supported types");

					break;

				case VERSION:

					printResource(Constants.VERSION_FILE);

					break;

				case DATABASES:

					final List<DatabaseDefinition> configuredDatabases = configurationProvider.getConfiguration().getDatabases();

					if (configuredDatabases.isEmpty()) {

						log.log(Level.WARNING, "No databases are configured.");

					} else {

						for (DatabaseDefinition dd : configuredDatabases) {

							log.log(Level.INFO, "Configured database: {0}", dd.getName());

						}

					}

					break;

				case CONNECTION:

					boolean connectionTestResult = false;

					String dbName = options.getDatabaseNameToTest();

					log.log(Level.FINE, "Testing connection to database: {0}", dbName);

					try {

						DatabaseDefinition dd = configurationProvider.getConfiguration().getDatabase(dbName);

						if (dd == null) {

							log.log(Level.SEVERE, "No database with this name is configured: {0}", dbName);

						} else {

							log.log(Level.FINE, "Database definition was loaded from configuration");

							DatabaseConnection dc = dd.connect();

							connectionTestResult = dc.test();

						}

					} catch (ConfigurationException | SQLException e) {

						log.log(Level.SEVERE, "Error during testing connection", e);

					}

					log.log(Level.INFO, "Connection test result: {0}", connectionTestResult ? "success" : "failure");

					break;

				default:

					throw new IllegalArgumentException("Unsupported INFO_TYPE: " + infoType);

			}

		}

	}

	private void printResource(String fileName) {

		try (BufferedReader reader = new BufferedReader(new InputStreamReader(getClass().getClassLoader().getResourceAsStream(fileName)))) {

			while (true) {

				String line = reader.readLine();

				if (line == null) {

					break;

				} else {

					println(line);

				}

			}

		} catch (Exception e) {

			log.log(Level.SEVERE, "Unable to print this info. Please see our website for it: " + Constants.WEBSITE, e);

		}

	}

	private void println(String line) {

		out.println(line);

	}

}