/**
 * This file is part of Graylog.
 *
 * Graylog 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.
 *
 * Graylog 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 Graylog.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.graylog2.shared;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class UI {

    private static final String HELP_DOCS = "http://docs.graylog.org/";
    private static final String HELP_COMMUNITY = "https://www.graylog.org/community-support/";
    private static final String HELP_COMMERCIAL = "https://www.graylog.com/support/";

    private static final Logger LOG = LoggerFactory.getLogger(UI.class);

    public static void exitHardWithWall(String msg) {
        exitHardWithWall(msg, new String[0]);
    }

    public static void exitHardWithWall(String msg, String... docLinks) {
        LOG.error(wallString(msg, docLinks));
        throw new IllegalStateException(msg);
    }

    public static String wallString(String msg, String... docLinks) {
        StringBuilder sb = new StringBuilder("\n");

        sb.append("\n").append(wall("#")).append("\n");

        sb.append("ERROR: ").append(msg).append("\n\n");

        sb.append("Need help?").append("\n\n");
        sb.append("* Official documentation: ").append(HELP_DOCS).append("\n");
        sb.append("* Community support: ").append(HELP_COMMUNITY).append("\n");
        sb.append("* Commercial support: ").append(HELP_COMMERCIAL).append("\n");

        if (docLinks != null && docLinks.length > 0) {
            sb.append("\n").append("But we also got some specific help " +
                                           "pages that might help you in this case:").append("\n\n");

            for (final String docLink : docLinks) {
                sb.append("* ").append(docLink).append("\n");
            }
        }

        sb.append("\n").append("Terminating. :(").append("\n\n");
        sb.append(wall("#"));

        return sb.toString();
    }

    private static String wall(String symbol) {
        StringBuilder sb = new StringBuilder();

        for(int i = 0; i < 80; i++) {
            sb.append(symbol);
        }

        return sb.append("\n").toString();
    }
}