package org.apache.maven.plugins.acr;

/*
 * 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 java.io.File;
import java.io.IOException;
import java.util.List;

import org.apache.commons.io.IOUtils;
import org.apache.commons.io.input.XmlStreamReader;
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.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugins.annotations.Component;
import org.apache.maven.plugins.annotations.LifecyclePhase;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.plugins.annotations.ResolutionScope;
import org.apache.maven.project.MavenProject;
import org.apache.maven.shared.filtering.MavenFileFilter;
import org.apache.maven.shared.filtering.MavenFilteringException;
import org.apache.maven.shared.filtering.MavenResourcesExecution;
import org.apache.maven.shared.utils.io.FileUtils.FilterWrapper;
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.ManifestException;
import org.codehaus.plexus.util.FileUtils;

/**
 * Build a JavaEE Application Client jar file from the current project.
 *
 * @author <a href="pablo@anahata-it.com">Pablo Rodriguez</a>
 * @author <a href="snicoll@apache.org">Stephane Nicoll</a>
 * @version $Id:
 */
// CHECKSTYLE_OFF: LineLength
@Mojo( name = "acr", requiresDependencyResolution = ResolutionScope.RUNTIME, threadSafe = true, defaultPhase = LifecyclePhase.PACKAGE )
// CHECKSTYLE_ON: LineLength
public class AcrMojo
    extends AbstractMojo
{

    private static final String APP_CLIENT_XML = "META-INF/application-client.xml";

    // TODO: will null work instead?
    private static final String[] DEFAULT_INCLUDES = { "**/**" };

    private static final String[] DEFAULT_EXCLUDES = { APP_CLIENT_XML };

    /**
     * The directory for the generated jar.
     */
    @Parameter( defaultValue = "${project.build.directory}", required = true, readonly = true )
    private File basedir;

    /**
     * Directory that resources are copied to during the build.<br/>
     * Starting with <b>3.0.0</b> the property has been renamed from <code>outputDirectory</code> to
     * <code>maven.acr.outputDirectory</code>.
     */
    @Parameter( property = "maven.acr.outputDirectory", defaultValue = "${project.build.outputDirectory}" )
    private File outputDirectory;

    /**
     * The name of the Application client JAR file to generate.
     */
    @Parameter( defaultValue = "${project.build.finalName}" )
    private String jarName;

    /**
     * The files and directories to exclude from the main Application Client jar. Usage:
     * <p/>
     * 
     * <pre>
     * &lt;excludes&gt;
     *   &lt;exclude&gt;**&#47;*DevOnly.class&lt;&#47;exclude&gt;
     * &lt;&#47;excludes&gt;
     * </pre>
     * 
     * <br/>
     * Default exclusions: META-INF&#47;application-client.xml,
     */
    @Parameter
    private List<String> excludes;

    /**
     * The Maven project.
     */
    @Parameter( defaultValue = "${project}", readonly = true, required = true )
    private MavenProject project;

    /**
     * The Jar archiver.
     */
    @Component( role = Archiver.class, hint = "jar" )
    private JarArchiver jarArchiver;

    /**
     * The archive configuration to use. See <a href="http://maven.apache.org/shared/maven-archiver/index.html">Maven
     * Archiver Reference</a>.
     */
    @Parameter
    private MavenArchiveConfiguration archive = new MavenArchiveConfiguration();

    /**
     * To escape interpolated value with windows path. c:\foo\bar will be replaced with c:\\foo\\bar.<br/>
     * Starting with <b>3.0.0</b> the property has been renamed from <code>acr.escapeBackslashesInFilePath</code> to
     * <code>maven.acr.escapeBackslashesInFilePath</code>.
     */
    @Parameter( property = "maven.acr.escapeBackslashesInFilePath", defaultValue = "false" )
    private boolean escapeBackslashesInFilePath;

    /**
     * An expression preceded with this String won't be interpolated. \${foo} will be replaced with ${foo}.<br/>
     * Starting with <b>3.0.0</b> the property has been renamed from <code>acr.escapeString</code> to
     * <code>maven.acr.escapeString</code>.
     */
    @Parameter( property = "maven.acr.escapeString" )
    protected String escapeString;

    /**
     * To filter the deployment descriptor. Starting with <b>3.0.0</b> the property has been renamed from
     * <code>acr.filterDeploymentDescriptor</code> to <code>maven.acr.filterDeploymentDescriptor</code>.
     */
    @Parameter( property = "maven.acr.filterDeploymentDescriptor", defaultValue = "false" )
    private boolean filterDeploymentDescriptor;

    /**
     * Filters (properties files) to include during the interpolation of the deployment descriptor.
     */
    @Parameter
    private List<String> filters;

    /**
     */
    @Component( role = MavenFileFilter.class, hint = "default" )
    private MavenFileFilter mavenFileFilter;

    /**
     */
    @Parameter( defaultValue = "${session}", readonly = true, required = true )
    private MavenSession session;

    /** {@inheritDoc} */
    public void execute()
        throws MojoExecutionException
    {
        if ( getLog().isInfoEnabled() )
        {
            getLog().info( "Building JavaEE Application client: " + jarName );
        }


        File jarFile = getAppClientJarFile( basedir, jarName );

        MavenArchiver archiver = new MavenArchiver();

        archiver.setArchiver( jarArchiver );

        archiver.setOutputFile( jarFile );

        try
        {
            String[] mainJarExcludes = DEFAULT_EXCLUDES;

            if ( excludes != null && !excludes.isEmpty() )
            {
                excludes.add( APP_CLIENT_XML );
                mainJarExcludes = excludes.toArray( new String[excludes.size()] );
            }

            if ( outputDirectory.exists() )
            {
                archiver.getArchiver().addDirectory( outputDirectory, DEFAULT_INCLUDES, mainJarExcludes );
            }
            else
            {
                // CHECKSTYLE_OFF: LineLength
                getLog().info( "JAR will only contain the META-INF/application-client.xml as no content was marked for inclusion" );
                // CHECKSTYLE_ON: LineLength
            }

            File deploymentDescriptor = new File( outputDirectory, APP_CLIENT_XML );

            if ( deploymentDescriptor.exists() )
            {
                if ( filterDeploymentDescriptor )
                {
                    getLog().debug( "Filtering deployment descriptor." );
                    MavenResourcesExecution mavenResourcesExecution = new MavenResourcesExecution();
                    mavenResourcesExecution.setEscapeString( escapeString );
                    List<FilterWrapper> filterWrappers =
                        mavenFileFilter.getDefaultFilterWrappers( project, filters, escapeBackslashesInFilePath,
                                                                  this.session, mavenResourcesExecution );

                    // Create a temporary file that we can copy-and-filter
                    File unfilteredDeploymentDescriptor = new File( outputDirectory, APP_CLIENT_XML + ".unfiltered" );
                    FileUtils.copyFile( deploymentDescriptor, unfilteredDeploymentDescriptor );
                    mavenFileFilter.copyFile( unfilteredDeploymentDescriptor, deploymentDescriptor, true,
                                              filterWrappers, getEncoding( unfilteredDeploymentDescriptor ) );
                    // Remove the temporary file
                    FileUtils.forceDelete( unfilteredDeploymentDescriptor );
                }
                archiver.getArchiver().addFile( deploymentDescriptor, APP_CLIENT_XML );
            }

            // create archive
            archiver.createArchive( session, project, archive );
            // CHECKSTYLE_OFF: LineLength
        }
        catch ( ArchiverException e )
        {
            throw new MojoExecutionException( "There was a problem creating the JavaEE Application Client  archive: "
                + e.getMessage(), e );
        }
        catch ( ManifestException e )
        {
            throw new MojoExecutionException( "There was a problem reading / creating the manifest for the JavaEE Application Client  archive: "
                + e.getMessage(), e );
        }
        catch ( IOException e )
        {
            throw new MojoExecutionException( "There was a I/O problem creating the JavaEE Application Client archive: "
                + e.getMessage(), e );
        }
        catch ( DependencyResolutionRequiredException e )
        {
            throw new MojoExecutionException( "There was a problem resolving dependencies while creating the JavaEE Application Client archive: "
                + e.getMessage(), e );
        }
        catch ( MavenFilteringException e )
        {
            throw new MojoExecutionException( "There was a problem filtering the deployment descriptor: "
                + e.getMessage(), e );
        }

        project.getArtifact().setFile( jarFile );

        // CHECKSTYLE_ON: LineLength
    }

    /**
     * Returns the App-client Jar file to generate.
     *
     * @param basedir the output directory
     * @param finalName the name of the ear file
     * @return the Application client JAR file to generate
     */
    private static File getAppClientJarFile( File basedir, String finalName )
    {
        return new File( basedir, finalName + ".jar" );
    }

    /**
     * Get the encoding from an XML-file.
     *
     * @param xmlFile the XML-file
     * @return The encoding of the XML-file, or UTF-8 if it's not specified in the file
     * @throws IOException if an error occurred while reading the file
     */
    private String getEncoding( File xmlFile )
        throws IOException
    {
        XmlStreamReader xmlReader = null;
        try
        {
            xmlReader = new XmlStreamReader( xmlFile );
            return xmlReader.getEncoding();
        }
        finally
        {
            IOUtils.closeQuietly( xmlReader );
        }
    }
}