/**

  * Alt2XML

  * Copyright © 2014 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 cz.frantovo.alt2xml.cli;

 import cz.frantovo.alt2xml.out.Action;

 import cz.frantovo.alt2xml.out.ActionContext;

 import cz.frantovo.alt2xml.out.ActionFactory;

 import cz.frantovo.alt2xml.out.OutputActionException;

 import java.util.HashMap;

 import java.util.Map;

 import java.util.ServiceLoader;

 import java.util.logging.Level;

 import java.util.logging.LogRecord;

 import java.util.logging.Logger;

 import javax.xml.parsers.ParserConfigurationException;

 import javax.xml.parsers.SAXParser;

 import javax.xml.parsers.SAXParserFactory;

 import org.xml.sax.SAXException;

 /**

  *

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

  */

 public class CLIStarter {

 	// help:exit-codes

 	public static final int EXIT_SUCCESS = 0; // doc:success

 	public static final int EXIT_UNEXPECTED_ERROR = 1; // doc:unexpected error (probably bug)

 	// 2 is reserved: http://www.tldp.org/LDP/abs/html/exitcodes.html#EXITCODESREF

 	public static final int EXIT_SAX_ERROR = 3; // doc:SAX error

 	public static final int EXIT_CLI_PARSE_ERROR = 4; // doc:CLI options parse error

 	public static final int EXIT_CLI_VALIDATE_ERROR = 5; // doc:CLI options validation error

 	public static final int EXIT_CONFIGURATION_ERROR = 6; // doc:configuration error

 	public static final int EXIT_OUTPUT_ACTION_ERROR = 7; // doc:formatting error

 	// public static final int EXIT_BATCH_ERROR = 8; // doc:batch error

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

 	private static final String PROGRAM_NAME = "alt2xml";

 	public static void main(String[] args) {

 		log.log(Level.FINE, "Starting " + PROGRAM_NAME);

 		int exitCode;

 		try {

 			CLIParser cliParser = new CLIParser();

 			CLIOptions cliOptions = cliParser.parseOptions(args);

 			cliOptions.validate();

 			Map<String, ActionFactory> actionFactories = new HashMap<>();

 			for (ActionFactory f : ServiceLoader.load(ActionFactory.class)) {

 				String code = f.getActionCode();

 				actionFactories.put(code, f);

 				log.log(Level.CONFIG, "Discovered output module: {0} = {1}", new Object[]{code, f.getClass().getName()});

 			}

 			String actionCode = cliOptions.getAction();

 			ActionFactory actionFactory = actionFactories.get(actionCode);

 			if (actionFactory == null) {

 				InvalidOptionsException e = new InvalidOptionsException();

 				e.addProblem(new InvalidOptionsException.OptionProblem("No such output action with code: " + actionCode));

 				throw e;

 			} else {

 				ActionContext actionContext = new ActionContext(cliOptions.getOutputStream());

 				Action action = actionFactory.getAction(actionContext);

 				SAXParserFactory t = SAXParserFactory.newInstance();

 				SAXParser p = t.newSAXParser();

 				action.run(p, cliOptions.getInputSource());

 			}

 			log.log(Level.FINE, "All done");

 			exitCode = EXIT_SUCCESS;

 		} catch (CLIParserException e) {

 			log.log(Level.SEVERE, "Unable to parse CLI options", e);

 			exitCode = EXIT_CLI_PARSE_ERROR;

 		} catch (InvalidOptionsException e) {

 			log.log(Level.SEVERE, "Invalid CLI options", e);

 			for (InvalidOptionsException.OptionProblem p : e.getProblems()) {

 				LogRecord r = new LogRecord(Level.SEVERE, "Option problem: {0}");

 				r.setThrown(p.getException());

 				r.setParameters(new Object[]{p.getDescription()});

 				log.log(r);

 			}

 			exitCode = EXIT_CLI_VALIDATE_ERROR;

 		} catch (OutputActionException e) {

 			log.log(Level.SEVERE, "Ouput module problem", e);

 			exitCode = EXIT_OUTPUT_ACTION_ERROR;

 		} catch (ParserConfigurationException | SAXException e) {

 			log.log(Level.SEVERE, "Unable to create SAX parser", e);

 			exitCode = EXIT_SAX_ERROR;

 		}

 		System.exit(exitCode);

 	}

 }