/*******************************************************************************
 * Copyright (c) 2013 Tasktop Technologies and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Tasktop Technologies - initial API and implementation
 *******************************************************************************/

package org.eclipse.mylyn.internal.gerrit.core.client;

import static java.lang.Integer.parseInt;

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

import org.eclipse.core.runtime.Assert;
import org.osgi.framework.Version;

public class GerritVersion extends Version {

	private static final Version VERSION_2_4_0 = new Version(2, 4, 0);

	private static final Version VERSION_2_5_0 = new Version(2, 5, 0);

	private static final Version VERSION_2_6_0 = new Version(2, 6, 0);

	private static final Version VERSION_2_7_0 = new Version(2, 7, 0);

	// e.g. 2.6 or 2.6.0
	private static final Pattern MAJOR_MINOR_MICRO_VERSION_PATTERN = Pattern.compile("V?\\d+\\.\\d+(\\.\\d+)?"); //$NON-NLS-1$

	// e.g. 2.6-rc3
	private static final Pattern MAJOR_MINOR_QUALIFIER_VERSION_PATTERN = Pattern.compile("V?(\\d+)\\.(\\d+)-([-\\w]+)"); //$NON-NLS-1$

	// e.g. 2.6.1-rc1
	private static final Pattern MAJOR_MINOR_MICRO_QUALIFIER_VERSION_PATTERN = Pattern.compile("V?(\\d+)\\.(\\d+)\\.(\\d+)-([-\\w]+)"); //$NON-NLS-1$

	public GerritVersion(String version) {
		super(version);
	}

	public static Version parseGerritVersion(String version) {
		Assert.isLegal(version != null);
		Assert.isLegal(!version.isEmpty());

		Matcher matcher = MAJOR_MINOR_MICRO_VERSION_PATTERN.matcher(version);
		if (matcher.matches()) {
			return Version.parseVersion(version);
		}
		matcher = MAJOR_MINOR_QUALIFIER_VERSION_PATTERN.matcher(version);
		if (matcher.matches()) {
			return new Version(parseInt(matcher.group(1)), parseInt(matcher.group(2)), 0, matcher.group(3));
		}
		matcher = MAJOR_MINOR_MICRO_QUALIFIER_VERSION_PATTERN.matcher(version);
		if (matcher.matches()) {
			return new Version(parseInt(matcher.group(1)), parseInt(matcher.group(2)), parseInt(matcher.group(3)),
					matcher.group(4));
		}
		throw new IllegalArgumentException("Unrecognized version pattern : " + version); //$NON-NLS-1$
	}

	public static boolean isVersion26OrLater(Version version) {
		return version.compareTo(VERSION_2_6_0) >= 0;
	}

	public static boolean isVersion27OrLater(Version version) {
		return version.compareTo(VERSION_2_7_0) >= 0;
	}

	public static boolean isVersion24x(Version version) {
		return version.compareTo(VERSION_2_4_0) >= 0 && version.compareTo(VERSION_2_5_0) < 0;
	}
}
