package org.apache.maven.plugin.assembly.archive;

/*
 * 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.maven.archiver.MavenArchiveConfiguration;
import org.apache.maven.archiver.MavenArchiver;
import org.apache.maven.artifact.DependencyResolutionRequiredException;
import org.apache.maven.execution.MavenSession;
import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.archiver.AbstractArchiveFinalizer;
import org.codehaus.plexus.archiver.Archiver;
import org.codehaus.plexus.archiver.ArchiverException;
import org.codehaus.plexus.archiver.jar.JarArchiver;
import org.codehaus.plexus.archiver.jar.Manifest;
import org.codehaus.plexus.archiver.jar.ManifestException;
import org.codehaus.plexus.util.IOUtil;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.Collections;
import java.util.List;

/**
 * @version $Id$
 */
public class ManifestCreationFinalizer
    extends AbstractArchiveFinalizer
{

    private final MavenProject project;

    private final MavenSession session;

    private final MavenArchiveConfiguration archiveConfiguration;

    // TODO: I'd really prefer to rewrite MavenArchiver as either a
    // separate manifest creation utility (and to
    // create an include pom.properties etc into another archiver), or
    // an implementation of an archiver
    // (the first is preferable).
    private final MavenArchiver mavenArchiver = new MavenArchiver();

    public ManifestCreationFinalizer( final MavenSession session, final MavenProject project,
                                      final MavenArchiveConfiguration archiveConfiguration )
    {
        this.session = session;
        this.project = project;
        this.archiveConfiguration = archiveConfiguration;
    }

    @Override
    public void finalizeArchiveCreation( final Archiver archiver ) throws ArchiverException
    {
        if ( archiveConfiguration != null )
        {
            try
            {
                Manifest manifest;
                final File manifestFile = archiveConfiguration.getManifestFile();

                if ( manifestFile != null )
                {
                    Reader manifestFileReader = null;
                    try
                    {
                        manifestFileReader = new InputStreamReader( new FileInputStream( manifestFile ), "UTF-8" );
                        manifest = new Manifest( manifestFileReader );
                    }
                    catch ( final FileNotFoundException e )
                    {
                        throw new ArchiverException( "Manifest not found: " + e.getMessage(), e );
                    }
                    catch ( final IOException e )
                    {
                        throw new ArchiverException( "Error processing manifest: " + e.getMessage(), e );
                    }
                    finally
                    {
                        IOUtil.close( manifestFileReader );
                    }
                }
                else
                {
                    manifest = mavenArchiver.getManifest( session, project, archiveConfiguration );
                }

                if ( ( manifest != null ) && ( archiver instanceof JarArchiver ) )
                {
                    final JarArchiver jarArchiver = (JarArchiver) archiver;
                    jarArchiver.addConfiguredManifest( manifest );
                }
            }
            catch ( final ManifestException e )
            {
                throw new ArchiverException( "Error creating manifest: " + e.getMessage(), e );
            }
            catch ( final DependencyResolutionRequiredException e )
            {
                throw new ArchiverException( "Dependencies were not resolved: " + e.getMessage(), e );
            }
        }
    }

    public List<String> getVirtualFiles()
    {
        if ( archiveConfiguration != null )
        {
            try
            {
                if ( mavenArchiver.getManifest( project, archiveConfiguration.getManifest() ) != null )
                {
                    return Collections.singletonList( "META-INF/MANIFEST.MF" );
                }
            }
            catch ( final ManifestException ignore )
            {
            }
            catch ( final DependencyResolutionRequiredException ignore )
            {
            }
        }

        return null;
    }

}