/**

 * 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);

	}

}