/*
 * Copyright 2012-2015 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat 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 2, or (at your
 * option) any later version.
 *
 * Thermostat 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 Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.launcher.internal;

import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.GnuParser;
import org.apache.commons.cli.MissingArgumentException;
import org.apache.commons.cli.MissingOptionException;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;

import com.redhat.thermostat.common.cli.Arguments;
import com.redhat.thermostat.common.cli.CommandLineArgumentParseException;
import com.redhat.thermostat.shared.locale.LocalizedString;
import com.redhat.thermostat.shared.locale.Translate;

public class CommandLineArgumentsParser {

    private static Translate<LocaleResources> tr = LocaleResources.createLocalizer();

    private Options options = new Options();

    @SuppressWarnings("unchecked")
    void addOptions(Options options) {
        for (Option option : (Collection<Option>) options.getOptions()) {
            this.options.addOption(option);
        }
    }

    Arguments parse(String[] args) throws CommandLineArgumentParseException {
        try {
            CommandLineParser parser = new GnuParser();
            CommandLine commandLine;
            commandLine = parser.parse(options, args);
            return new CommandLineArguments(commandLine);
        } catch (MissingOptionException moe) {
            LocalizedString msg = createMissingOptionsMessage(moe);
            throw new CommandLineArgumentParseException(msg, moe);
        } catch (ParseException e) {
            throw new CommandLineArgumentParseException(tr.localize(LocaleResources.PARSE_EXCEPTION_MESSAGE, e.getMessage()), e);
        }
    }

    private LocalizedString createMissingOptionsMessage(MissingOptionException moe) {
        @SuppressWarnings("unchecked")
        List<String> missingOptions = moe.getMissingOptions();
        String[] presentableMissingOptions = new String[missingOptions.size()];
        int optIndex = 0;
        for (Iterator<String> i = missingOptions.iterator(); i.hasNext();) {
            StringBuilder missingOptionBuilder = new StringBuilder();
            String missingOption = i.next();
            if (missingOption.length() > 1) {
                missingOptionBuilder.append("--");
            } else {
                missingOptionBuilder.append("-");
            }
            missingOptionBuilder.append(missingOption);

            presentableMissingOptions[optIndex] = missingOptionBuilder.toString();
            optIndex++;
        }
        if (missingOptions.size() == 1) {
            return tr.localize(LocaleResources.MISSING_OPTION, presentableMissingOptions, ", ", 0, new String[]{});
        } else {
            return tr.localize(LocaleResources.MISSING_OPTIONS, presentableMissingOptions, ", ", 0, new String[]{});
        }
    }
}