/**
 * Copyright (C) 2011-2013 Nicolas Vinot <aeris@imirhil.fr>
 * Copyright (C) 2017 Christian Pierre MOMON <cmomon@april.org>
 *
 * This file is part of (April) Hebdobot.
 *
 * Hebdobot is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Hebdobot 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Hebdobot.  If not, see <http://www.gnu.org/licenses/>
 */
package org.april.hebdobot;

import java.io.File;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.DefaultParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import fr.devinsy.util.strings.StringList;

/**
 * The Class Launcher.
 */
public class HebdobotLauncher
{
    private static final Logger logger = LoggerFactory.getLogger(HebdobotLauncher.class);

    public static final String HEBDOBOT_VERSION = "v2.0";
    private static final String DEFAULT_CONFIG_FILE = "hebdobot.conf";

    /**
     * Instantiates a new hebdobot launcher.
     */
    private HebdobotLauncher()
    {
    }

    /**
     * Help.
     */
    public static void help()
    {
        StringList message = new StringList();

        message.append("Hebdobot version ").appendln(HEBDOBOT_VERSION);
        message.appendln("Usage:");
        message.appendln("    hebdobot [ -h | -help | --help ]");
        message.appendln("    hebdobot [ -c configuration-file ]");

        System.out.println(message.toString());
    }

    /**
     * The main method.
     *
     * @param args
     *            the arguments
     */
    public static void main(final String[] args)
    {
        try
        {
            setDefaultException();

            Options options = new Options();

            options.addOption("h", "help", false, "Help option");
            options.addOption("c", true, "Config file");

            CommandLineParser parser = new DefaultParser();
            CommandLine commandLine = parser.parse(options, args);

            if (commandLine.hasOption("h"))
            {
                logger.debug("Help requires.");
                help();

                HelpFormatter formatter = new HelpFormatter();
                formatter.printHelp("hebdobot", options);
            }
            else
            {
                // Find the configuration file.
                File configFile;
                if (commandLine.hasOption("c"))
                {
                    logger.debug("'-c' option detected with value [{}].", commandLine.getOptionValue("c"));

                    // Check configuration file.
                    String value = commandLine.getOptionValue("c");
                    if (StringUtils.isBlank(value))
                    {
                        throw new HebdobotException("Missing config file value.");
                    }
                    else
                    {
                        configFile = new File(commandLine.getOptionValue("c"));
                    }
                }
                else
                {
                    logger.debug("'-c' option NOT detected.");

                    // Try to load default configuration file in current work
                    // directory.
                    configFile = new File(DEFAULT_CONFIG_FILE);
                }

                // Load configuration file.
                HebdobotSettings settings = HebdobotConfigFile.load(configFile);

                if (HebdobotSettings.isValid(settings))
                {
                    Hebdobot bot = new Hebdobot(settings.getHost(), settings.getPort(), settings.getName(), settings.getChannel(),
                            settings.getReviewFileSuffix());
                    bot.setIdenticaSettings(settings.getIdentica());
                    bot.setPastebinSettings(settings.getPastebin());
                    bot.setTwitterSettings(settings.getTwitter());
                    bot.run();
                }
                else
                {
                    throw new HebdobotException("Invalid config file [" + configFile.getPath() + "]");
                }
            }
        }
        catch (ParseException exception)
        {
            System.out.print("Parse error: ");
            System.out.println(exception.getMessage());
        }
        catch (HebdobotException exception)
        {
            System.err.println("HebdobotException = " + exception.getMessage());
            logger.error(exception.getMessage(), exception);
            help();
        }
    }

    /**
     * Sets the default exception.
     */
    public static void setDefaultException()
    {
        Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler()
        {
            /* (non-Javadoc)
             * @see java.lang.Thread.UncaughtExceptionHandler#uncaughtException(java.lang.Thread, java.lang.Throwable)
             */
            @Override
            public void uncaughtException(final Thread thread, final Throwable exception)
            {
                String message;
                if (exception instanceof OutOfMemoryError)
                {
                    message = "Java ran out of memory!\n\n";
                }
                else
                {
                    message = String.format("An error occured: %1s(%2s)", exception.getClass(), exception.getMessage());
                }

                HebdobotLauncher.logger.error("uncaughtException ", exception);
                HebdobotLauncher.logger.error(message);
                HebdobotLauncher.logger.info("Unexpected error.");
            }
        });
    }
}