/*
 * 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.
 */
package org.apache.servicemix.maven.plugin.jbi;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.resolver.filter.ScopeArtifactFilter;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.codehaus.plexus.util.FileUtils;

/**
 * A Mojo used to build the jbi.xml file for a shared library
 * 
 * @author <a href="pdodds@apache.org">Philip Dodds</a>
 * @version $Id: GenerateComponentDescriptorMojo 314956 2005-10-12 16:27:15Z
 *          brett $
 * @goal generate-jbi-shared-library-descriptor
 * @phase generate-resources
 * @requiresDependencyResolution runtime
 * @description generates the jbi.xml deployment descriptor for a shared library
 */
public class GenerateSharedLibraryDescriptorMojo extends AbstractJbiMojo {

    public static final String UTF_8 = "UTF-8";

    /**
     * Whether the jbi.xml should be generated or not.
     * 
     * @parameter
     */
    private Boolean generateJbiDescriptor = Boolean.TRUE;

    /**
     * The shared library name.
     * 
     * @parameter expression="${project.artifactId}"
     */
    private String name;

    /**
     * The shared library description.
     * 
     * @parameter expression="${project.name}"
     */
    private String description;

    /**
     * The shared library version.
     * 
     * @parameter expression="${project.version}"
     */
    private String version;

    /**
     * The shared library class loader delegation
     * 
     * @parameter expression="parent-first"
     */
    private String classLoaderDelegation;

    /**
     * Character encoding for the auto-generated application.xml file.
     * 
     * @parameter
     */
    private String encoding = UTF_8;

    /**
     * Directory where the application.xml file will be auto-generated.
     * 
     * @parameter expression="${project.build.directory}"
     */
    private String generatedDescriptorLocation;

    public void execute() throws MojoExecutionException, MojoFailureException {

        getLog()
                .debug(
                        " ======= GenerateSharedLibraryDescriptorMojo settings =======");
        getLog().debug("workDirectory[" + workDirectory + "]");
        getLog().debug("generateJbiDescriptor[" + generateJbiDescriptor + "]");
        getLog().debug("name[" + name + "]");
        getLog().debug("description[" + description + "]");
        getLog().debug("encoding[" + encoding + "]");
        getLog().debug(
                "generatedDescriptorLocation[" + generatedDescriptorLocation
                        + "]");
        getLog().debug("version[" + version + "]");

        if (!generateJbiDescriptor.booleanValue()) {
            getLog().debug("Generation of jbi.xml is disabled");
            return;
        }

        // Generate jbi descriptor and copy it to the build directory
        getLog().info("Generating jbi.xml");
        try {
            generateJbiDescriptor();
        } catch (JbiPluginException e) {
            throw new MojoExecutionException("Failed to generate jbi.xml", e);
        }

        try {
            FileUtils.copyFileToDirectory(new File(generatedDescriptorLocation,
                    JBI_DESCRIPTOR), new File(getWorkDirectory(), META_INF));
        } catch (IOException e) {
            throw new MojoExecutionException(
                    "Unable to copy jbi.xml to final destination", e);
        }
    }

    /**
     * Generates the deployment descriptor if necessary.
     */
    protected void generateJbiDescriptor() throws JbiPluginException {
        File outputDir = new File(generatedDescriptorLocation);
        if (!outputDir.exists()) {
            outputDir.mkdirs();
        }

        File descriptor = new File(outputDir, JBI_DESCRIPTOR);

        List embeddedLibraries = new ArrayList();

        DependencyInformation info = new DependencyInformation();
        info.setFilename(LIB_DIRECTORY + "/" + project.getArtifactId() + "-"
                + project.getVersion() + ".jar");
        info.setVersion(project.getVersion());
        info.setName(project.getArtifactId());
        info.setType("jar");
        embeddedLibraries.add(info);

        Set artifacts = project.getArtifacts();
        for (Iterator iter = artifacts.iterator(); iter.hasNext();) {
            Artifact artifact = (Artifact) iter.next();

            // TODO: utilise appropriate methods from project builder
            ScopeArtifactFilter filter = new ScopeArtifactFilter(
                    Artifact.SCOPE_RUNTIME);
            if (!artifact.isOptional() && filter.include(artifact)) {
                String type = artifact.getType();
                if ("jar".equals(type)) {
                    info = new DependencyInformation();
                    info.setFilename(LIB_DIRECTORY + "/"
                            + artifact.getFile().getName());
                    embeddedLibraries.add(info);
                }
            }
        }

        JbiSharedLibraryDescriptorWriter writer = new JbiSharedLibraryDescriptorWriter(
                encoding);
        writer.write(descriptor, name, description, version,
                classLoaderDelegation, embeddedLibraries);
    }
}