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/*
 *  Copyright (C) 2007-2014 Christian Bockermann 
 *
 *  This file is part of the  web-audit  library.
 *
 *  web-audit library 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.
 *
 *  The  web-audit  library 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, see .
 *
 */
package org.jwall;


import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.util.Date;

import com.thoughtworks.xstream.annotations.XStreamAlias;


/**
 * 
 * This is a simple class for providing version information about this
 * package. The version information is obtained from the /org.jwall.web.audit.info file.
 * 
 * 
 * @author Christian Bockermann <[email protected]>
 *
 */
@XStreamAlias("Version")
public class Version
{
	String groupId;

	String artifactId;

	String version;

	String revision = "";

	String build = "";

	Date released;


	public Version( String ver, String rev, Date releaseDate ){
		this.version = ver;
		this.revision = rev;
		this.released = releaseDate;
	}


	public Version( String groupId, String artifactId, String ver, String rev, String build, Date releaseDate ){
		this( ver, rev, releaseDate );
		this.groupId = groupId;
		this.artifactId = artifactId;
		this.build = build;
	}


	/**
	 * @return the version
	 */
	public String getVersion()
	{
		return version;
	}


	/**
	 * @param version the version to set
	 */
	public void setVersion(String version)
	{
		this.version = version;
	}


	/**
	 * @return the revision
	 */
	public String getRevision()
	{
		return revision;
	}


	/**
	 * @param revision the revision to set
	 */
	public void setRevision(String revision)
	{
		this.revision = revision;
	}


	/**
	 * @return the released
	 */
	public Date getReleased()
	{
		return released;
	}


	/**
	 * @param released the released to set
	 */
	public void setReleased(Date released)
	{
		this.released = released;
	}


	public final static Version getVersion( String groupId, String artifactId ){

		final String propertiesPath = "/" + artifactId + ".info"; //+ PATH_POSTFIX;
		//log.debug( "Looking for version-file: {}", propertiesPath );
		try {
			final InputStream resourceStream = Version.class.getResourceAsStream(propertiesPath);
			if( resourceStream == null )
				return new Version( groupId, artifactId, "?", "?", "", new Date() );

			LineNumberReader reader = new LineNumberReader(new InputStreamReader(resourceStream));

			String versionString = "";
			String groupString = "";
			String artifactString = artifactId;
			String buildString = "";

			// find "version=..."
			String line = reader.readLine();
			while( line != null ){

				if( !line.trim().startsWith( "#" ) ){
					String[] t = line.split( "=", 2 );
					if( t[0].equals( "version" ) )
						versionString = t[1].trim();

					if( t[0].equals( "groupId" ) )
						groupString = t[1].trim();

					if( t[0].equals( "artifactId" ) )
						artifactString = t[1].trim();

					if( t[0].equals( "build" ) )
						buildString = t[1].trim();

				}

				line = reader.readLine();
			}

			reader.close();
			return new Version( groupString, artifactString, versionString, "", buildString, new Date() );

		} catch (Exception e) {
			System.err.println( "can't load pom.properites => version information will be unavailable"  );
		}

		return new Version( groupId, artifactId, "?", "?", "", new Date() );
	}


	public String toString(){
		String b = build;
		if( b != null )
			b = b.replaceAll( "\\D*", "" );

		StringBuffer s = new StringBuffer();
		if( groupId != null && !groupId.isEmpty() )
			s.append( groupId + "/" );

		if( artifactId != null )
			s.append( artifactId );

		if( version != null && !version.trim().isEmpty() )
			s.append( "-" + version.trim() );

		if( b != null && ! b.trim().isEmpty() )
			s.append( "-b" + b );

		return s.toString();
	}


	/**
	 * This method extracts the revision number from the given string. The
	 * input string is expected to simply contain the subversion $Revision...$
	 * format. 
	 * 
	 * @param revision
	 * @return
	 */
	public static String extractRevision( String revision ){
		int st = revision.indexOf( " " );
		if( st < 0 )
			return "";
		int en = revision.indexOf( " ", st + 1 );
		if( en < st )
			return "";

		String rev = revision.substring( st + 1, en );
		return rev;
	}
	
	
	public String getBuild(){
		return build;
	}
	

	public static void main( String[] args ){

		if( args.length > 1 ){
			System.out.println( Version.getVersion( args[0], args[1] ) );
		} else {
			System.out.println( Version.getVersion( "org.jwall", "org.jwall.web.audit" ) );
		}
	}
}