package org.apache.maven.archiva.repository.metadata;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import org.apache.commons.lang.math.NumberUtils;
import org.apache.maven.archiva.model.ArchivaRepositoryMetadata;
import org.apache.maven.archiva.model.Plugin;
import org.apache.maven.archiva.model.SnapshotVersion;
import org.apache.maven.archiva.xml.XMLException;
import org.apache.maven.archiva.xml.XMLReader;
import org.dom4j.Element;

import java.io.File;
import java.util.Date;

/**
 * RepositoryMetadataReader - read maven-metadata.xml files.
 *
 * @author <a href="mailto:joakime@apache.org">Joakim Erdfelt</a>
 * @version $Id$
 */
public class RepositoryMetadataReader
{
    /**
     * Read and return the {@link ArchivaRepositoryMetadata} object from the provided xml file.
     * 
     * @param metadataFile the maven-metadata.xml file to read.
     * @return the archiva repository metadata object that represents the provided file contents.
     * @throws RepositoryMetadataException
     */
    public static ArchivaRepositoryMetadata read( File metadataFile )
        throws RepositoryMetadataException
    {
        try
        {
            XMLReader xml = new XMLReader( "metadata", metadataFile );
            // invoke this to remove namespaces, see MRM-1136
            xml.removeNamespaces();
            
            ArchivaRepositoryMetadata metadata = new ArchivaRepositoryMetadata();

            metadata.setGroupId( xml.getElementText( "//metadata/groupId" ) );
            metadata.setArtifactId( xml.getElementText( "//metadata/artifactId" ) );
            metadata.setVersion( xml.getElementText( "//metadata/version" ) );
            metadata.setFileLastModified( new Date( metadataFile.lastModified() ) );
            metadata.setFileSize( metadataFile.length() );
            metadata.setWhenIndexed( null );

            metadata.setLastUpdated( xml.getElementText( "//metadata/versioning/lastUpdated" ) );
            metadata.setLatestVersion( xml.getElementText( "//metadata/versioning/latest" ) );
            metadata.setReleasedVersion( xml.getElementText( "//metadata/versioning/release" ) );
            metadata.setAvailableVersions( xml.getElementListText( "//metadata/versioning/versions/version" ) );

            Element snapshotElem = xml.getElement( "//metadata/versioning/snapshot" );
            if ( snapshotElem != null )
            {
                SnapshotVersion snapshot = new SnapshotVersion();
                snapshot.setTimestamp( snapshotElem.elementTextTrim( "timestamp" ) );
                String tmp = snapshotElem.elementTextTrim( "buildNumber" );
                if( NumberUtils.isNumber( tmp ))
                {
                    snapshot.setBuildNumber( NumberUtils.toInt( tmp ) );
                }
                metadata.setSnapshotVersion( snapshot );
            }

            for ( Element plugin : xml.getElementList( "//metadata/plugins/plugin" ) )
            {
                Plugin p = new Plugin();
                p.setPrefix( plugin.elementTextTrim( "prefix" ) );
                p.setArtifactId( plugin.elementTextTrim( "artifactId" ) );
                p.setName( plugin.elementTextTrim( "name" ) );
                metadata.addPlugin( p );
            }

            return metadata;
        }
        catch ( XMLException e )
        {
            throw new RepositoryMetadataException( e.getMessage(), e );
        }
    }
}