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/**
 * Copyright (c) 2008 Pyxis Technologies inc.
 *
 * This 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 of the License, or
 * (at your option) any later version.
 *
 * This software 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA,
 * or see the FSF site: http://www.fsf.org.
 *
 * @author oaouattara
 * @version $Id: $Id
 */
package com.greenpepper.confluence.utils;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.atlassian.confluence.util.GeneralUtil;
public final class ConfluenceVersion
		implements Comparable
{

	/** Constant V26X */
	public static final ConfluenceVersion V26X = new ConfluenceVersion(2, 6);
	/** Constant V28X */
	public static final ConfluenceVersion V28X = new ConfluenceVersion(2, 8);
	/** Constant V29X */
	public static final ConfluenceVersion V29X = new ConfluenceVersion(2, 9);
	/** Constant V210X */
	public static final ConfluenceVersion V210X = new ConfluenceVersion(2, 10);
	/** Constant V30X */
	public static final ConfluenceVersion V30X = new ConfluenceVersion(3, 0);
    /** Constant V40X */
    public static final ConfluenceVersion V40X = new ConfluenceVersion(4, 0);
    /** Constant V50X */
    public static final ConfluenceVersion V50X = new ConfluenceVersion(5, 0);

	private static final Pattern VERSION_PATTERN = Pattern.compile("(\\d+).(\\d+)(.\\d+)?");

	private static ConfluenceVersion CURRENT;
	
	private final int major;
	private final int minor;

	private ConfluenceVersion(int major, int minor)
	{
		this.major = major;
		this.minor = minor;
	}

	/**
	 * Getter for the field major.
	 *
	 * @return a int.
	 */
	public int getMajor()
	{
		return major;
	}

	/**
	 * Getter for the field minor.
	 *
	 * @return a int.
	 */
	public int getMinor()
	{
		return minor;
	}

	/** {@inheritDoc} */
	@Override
	public boolean equals(Object obj)
	{
		if (!(obj instanceof ConfluenceVersion)) return false;

		ConfluenceVersion version = (ConfluenceVersion)obj;

		return version.getMajor() == getMajor() && version.getMinor() == getMinor();
	}

	/** {@inheritDoc} */
	public int compareTo(Object o)
	{
		ConfluenceVersion version = (ConfluenceVersion)o;

		if (getMajor() > version.getMajor())
		{
			return 1;
		}

		if (getMajor() < version.getMajor())
		{
			return -1;
		}

		return new Integer(getMinor()).compareTo(version.getMinor());
	}

	/**
	 * getCurrentVersion.
	 *
	 * @return a {@link com.greenpepper.confluence.utils.ConfluenceVersion} object.
	 */
	public static ConfluenceVersion getCurrentVersion()
	{
		if (CURRENT == null)
		{
			CURRENT = extractVersionFrom(GeneralUtil.getVersionNumber());
		}

		return CURRENT;
	}

	static ConfluenceVersion extractVersionFrom(String version)
	{
		Matcher m = VERSION_PATTERN.matcher(version);

		if (m.find())
		{
			String major = m.group(1);
			String minor = m.group(2);

			return new ConfluenceVersion(Integer.parseInt(major), Integer.parseInt(minor));
		}

		throw new RuntimeException("Cannot detect major version number from '" + GeneralUtil.getVersionNumber() + "'");
	}
}