package org.apache.maven;

/* ====================================================================
 *   Copyright 2001-2004 The Apache Software Foundation.
 *
 *   Licensed 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.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.maven.project.Dependency;
import org.apache.maven.project.Project;

/**
 * @author <a href="michal.maczka@dimatics.com">Michal Maczka</a>
 * @version $Id: DependencyDescriberBean.java,v 1.3 2004/03/02 15:36:14 evenisse Exp $
 */
public class DependencyDescriberBean
{
    /** for debug output */
    private Log log = LogFactory.getLog(DependencyDescriberBean.class);
    
    /** */
    private List dependencies = new ArrayList();
    private Project project;

    /**
     * @return
     */
    public List getDependencies()
    {
        return dependencies;
    }

    /**
     * Project provides context/session related information.
     * e.g where maven repo local is  
     * @param project
     */
    public void build(Project project)
    {
        this.project = project;
        for (Iterator iter = project.getDependencies().iterator();
            iter.hasNext();
            )
        {
            Dependency dependency = (Dependency) iter.next();
            DescribedDependency describedDependency =
                new DescribedDependency(dependency);
            dependencies.add(describedDependency);
            Project resolvedProject = resolveProject(dependency);
            if (resolvedProject != null)
            {
                log.debug("POM URL:" + resolvedProject.getUrl());
                describedDependency.setUrl(resolvedProject.getUrl());
                describedDependency.setDescription(
                    resolvedProject.getDescription());
            }
        }
        Collections.sort(dependencies);
    }
    /**
     * @param dependency
     * @return
     * @throws Exception
     */
    private Project resolveProject(Dependency dependency)
    {

        File projectFile = null;
        if ("pom".equals(dependency.getType()))
        {
            projectFile =
                new File(
                    project.getContext().getMavenRepoLocal(),
                    dependency.getArtifact());
        }
        else
        {
            projectFile =
                new File(
                    project.getContext().getMavenRepoLocal(),
                    dependency.getArtifactDirectory()
                        + "/poms/"
                        + dependency.getArtifactId()
                        + "-"
                        + dependency.getVersion()
                        + ".pom");
        }
        try
        {
            if (projectFile.exists() && projectFile.canRead())
            {

                return MavenUtils.getProject(projectFile, null, false);
            }
            else
            {
                log.debug("Failed to read POM:" + projectFile);
                return null;
            }
        }
        catch (Exception e)
        {
            log.debug("Failed to read POM:" + projectFile);
            return null;
        }
    }
}