/*
 * Copyright (C) 2020 Christian Pierre MOMON <christian@momon.org>
 * 
 * This file is part of StatoolInfos, simple service statistics tool.
 * 
 * StatoolInfos 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.
 * 
 * StatoolInfos 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 StatoolInfos.  If not, see <http://www.gnu.org/licenses/>.
 */
package fr.devinsy.statoolinfos.cli;

import java.io.File;
import java.time.LocalDateTime;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import fr.devinsy.statoolinfos.core.StatoolInfos;
import fr.devinsy.statoolinfos.util.BuildInformation;
import fr.devinsy.statoolinfos.util.Files;
import fr.devinsy.strings.StringList;

/**
 * The Class <code>StatoolInfosCLI</code> manages a Command Line Interface for
 * StatoolInfos.
 * 
 */
public final class StatoolInfosCLI
{
    private static Logger logger = LoggerFactory.getLogger(StatoolInfosCLI.class);

    /**
     * Instantiates a new statool infos CLI.
     */
    private StatoolInfosCLI()
    {
    }

    /**
     * Convert path.
     *
     * @param path
     *            the path
     * @return the files
     */
    public static Files convertPath(final String path)
    {
        Files result;

        result = new Files();

        if (StringUtils.isNotBlank(path))
        {
            File input = new File(path);

            if (input.exists())
            {
                if (input.isFile())
                {
                    result.add(input);
                }
                else
                {
                    for (File file : input.listFiles())
                    {
                        if ((file.isFile()) && (file.getName().endsWith(".conf")))
                        {
                            result.add(file);
                        }
                    }
                }
            }
            else
            {
                result.add(input);
            }
        }

        //
        return result;
    }

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

        message.append("StatoolInfos CLI version ").appendln(BuildInformation.instance().version());
        message.appendln("Usage:");
        message.appendln("    statoolinfos [ -h | -help | --help ]");
        message.appendln("    statoolinfos [ -v | -version | --version ]");
        message.appendln("    statoolinfos clear   [ directory | file ]");
        message.appendln("    statoolinfos probe   [ directory | file ]");
        message.appendln("    statoolinfos build   [ directory | file ]");
        message.appendln("    statoolinfos crawl   [ directory | file ]");
        message.appendln("    statoolinfos htmlize [ directory | file ]");

        logger.info(message.toString());
    }

    /**
     * Display version.
     */
    public static void displayVersion()
    {
        StringList message = new StringList();

        message.appendln(BuildInformation.instance().version());

        logger.info(message.toString());
    }

    /**
     * Checks if is matching.
     *
     * @param args
     *            the args
     * @param regexps
     *            the regexps
     * @return true, if is matching
     */
    public static boolean isMatching(final String[] args, final String... regexps)
    {
        boolean result;

        if ((args.length == 0) && (regexps == null))
        {
            result = true;
        }
        else if ((args.length != 0) && (regexps == null))
        {
            result = false;
        }
        else if (args.length != regexps.length)
        {
            result = false;
        }
        else
        {
            boolean ended = false;
            int index = 0;
            result = false;
            while (!ended)
            {
                if (index < args.length)
                {
                    String arg = args[index];
                    String regexp = regexps[index];

                    if (arg.matches(regexp))
                    {
                        index += 1;
                    }
                    else
                    {
                        ended = true;
                        result = false;
                    }
                }
                else
                {
                    ended = true;
                    result = true;
                }
            }
        }

        //
        return result;
    }

    /**
     * 
     * This method launch CLI.
     * 
     * @param args
     *            necessary arguments
     */
    public static void run(final String[] args)
    {
        // Set default catch.
        Thread.setDefaultUncaughtExceptionHandler(new Thread.UncaughtExceptionHandler()
        {
            @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());
                }

                logger.error("uncaughtException ", exception);
                logger.error(message);
                logger.info("Oups, an unexpected error occured. Please try again.");
            }
        });

        logger.info("{} StatoolInfos call: {}", LocalDateTime.now(), new StringList(args).toStringSeparatedBy(" "));

        if (isMatching(args))
        {
            logger.info("No parameter.");
            displayHelp();
        }
        else if (isMatching(args, "(-h|--h|--help)"))
        {
            displayHelp();
        }
        else if (isMatching(args, "(-v|-version|--version)"))
        {
            displayVersion();
        }
        else if (isMatching(args, "clear", "\\s*.+\\s*"))
        {
            Files inputs = convertPath(StringUtils.trim(args[1]));
            for (File input : inputs)
            {
                try
                {
                    StatoolInfos.clear(input);
                }
                catch (Exception exception)
                {
                    logger.error("Error with [{}]: {}", input.getAbsoluteFile(), exception.getMessage());
                }
            }
        }
        else if (isMatching(args, "probe", "\\s*.+\\s*"))
        {
            Files inputs = convertPath(StringUtils.trim(args[1]));
            for (File input : inputs)
            {
                try
                {
                    StatoolInfos.probe(input);
                }
                catch (Exception exception)
                {
                    logger.error("Error with [{}]: {}", input.getAbsoluteFile(), exception.getMessage());
                }
            }
        }
        else if (isMatching(args, "build", "\\s*.+\\s*"))
        {
            Files inputs = convertPath(StringUtils.trim(args[1]));
            for (File input : inputs)
            {
                try
                {
                    StatoolInfos.build(input);
                }
                catch (Exception exception)
                {
                    logger.error("Error with [{}]: {}", input.getAbsoluteFile(), exception.getMessage());
                }
            }
        }
        else if (isMatching(args, "crawl", "\\s*.+\\s*"))
        {
            Files inputs = convertPath(StringUtils.trim(args[1]));
            for (File input : inputs)
            {
                try
                {
                    StatoolInfos.crawl(input);
                }
                catch (Exception exception)
                {
                    logger.error("Error with [{}]: {}", input.getAbsoluteFile(), exception.getMessage());
                    exception.printStackTrace();
                }
            }
        }
        else if (isMatching(args, "htmlize", "\\s*.+\\s*"))
        {
            Files inputs = convertPath(StringUtils.trim(args[1]));
            for (File input : inputs)
            {
                try
                {
                    StatoolInfos.htmlize(input);
                }
                catch (Exception exception)
                {
                    logger.error("Error with [{}]: {}", input.getAbsoluteFile(), exception.getMessage());
                    exception.printStackTrace();
                }
            }
        }
        else
        {
            logger.info("Bad usage.");
            displayHelp();
        }

        //
        logger.info("Done.");
    }
}