/*
 * NOTE: This copyright does *not* cover user programs that use HQ
 * program services by normal system calls through the application
 * program interfaces provided as part of the Hyperic Plug-in Development
 * Kit or the Hyperic Client Development Kit - this is merely considered
 * normal use of the program, and does *not* fall under the heading of
 * "derived work".
 * 
 * Copyright (C) [2004, 2005, 2006], Hyperic, Inc.
 * This file is part of HQ.
 * 
 * HQ is free software; you can redistribute it and/or modify
 * it under the terms version 2 of the GNU General Public License as
 * published by the Free Software Foundation. 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA.
 */

package org.hyperic.hq.common.shared;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ProductProperties {
    private static final String PROP_VERSION = "version";
    private static final String PROP_BUILD_DATE = "build.date";
    private static final String PROP_BUILD_NUMBER = "build.number";
    private static final String PROP_FLAVOUR = "hq.flavour";

    private static Properties _props;
    private static final Object _propsLock = new Object();

    private ProductProperties() {
    }

    public static String getVersion() {
        return getRequiredProperty(PROP_VERSION);
    }

    public static String getBuildDate() {
        return getRequiredProperty(PROP_BUILD_DATE);
    }

    public static String getFlavour() {
        return getRequiredProperty(PROP_FLAVOUR);
    }

    public static String getBuildNumber() {
        String build =  getRequiredProperty(PROP_BUILD_NUMBER);
        Pattern p = Pattern.compile("(.*-)(\\d+)");
        Matcher m = p.matcher(build);
        if (m.matches()) {
            if (build.toLowerCase().contains("ci")) {
                return "CI-" + m.group(2);
            } 
            if (build.toLowerCase().contains("daily")) {
                return "Daily-" + m.group(2);
            } 
            return m.group(2);
        }
        return build;
    }

   

    private static void load(String name, boolean required) {
        InputStream in = ProductProperties.class.getClassLoader().getResourceAsStream(name);

        if (in == null) {
            if (required) {
                throw new IllegalStateException("Package not packed " + "correctly, missing: " +
                                                name);
            }
            return;
        }

        try {
            _props.load(in);
        } catch (IOException e) {
            throw new IllegalStateException("Failed to read " + name + ": " + e);
        }
    }

    public static Properties getProperties() {
        synchronized (_propsLock) {
            if (_props == null) {
                _props = new Properties();

                load("hq-version.properties", false);
                load("product.properties", false);
            }
        }
        return _props;
    }

    public static String getProperty(String key) {
        return getProperties().getProperty(key);
    }

    private static String getRequiredProperty(String prop) {
        String res;

        if ((res = getProperty(prop)) == null) {
            throw new IllegalStateException("Failed to find " + prop);
        }

        return res;
    }

}