(3.0-RC1) Maven Java API does not give nice error messages when improperly configured

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 */
package org.jboss.arqmvn;

import java.io.File;
import java.util.ArrayList;

import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.repository.ArtifactRepositoryPolicy;
import org.apache.maven.artifact.repository.MavenArtifactRepository;
import org.apache.maven.artifact.repository.layout.ArtifactRepositoryLayout;
import org.apache.maven.project.DefaultProjectBuildingRequest;
import org.apache.maven.project.ProjectBuilder;
import org.apache.maven.project.ProjectBuildingException;
import org.apache.maven.project.ProjectBuildingRequest;
import org.apache.maven.project.ProjectBuildingResult;
import org.codehaus.plexus.DefaultPlexusContainer;
import org.codehaus.plexus.logging.console.ConsoleLoggerManager;
import org.sonatype.aether.impl.internal.SimpleLocalRepositoryManager;
import org.sonatype.aether.util.DefaultRepositorySystemSession;

/**
 * @author <a href="mailto:lincolnbaxter@gmail.com">Lincoln Baxter, III</a>
 */
public class MavenFacet
{
   private final ProjectBuildingRequest request = new DefaultProjectBuildingRequest();
   private DefaultPlexusContainer container = null;
   private ProjectBuilder builder = null;

   private void bootstrapMaven()
   {
      if (!initialized())
      {
         try
         {
            container = new DefaultPlexusContainer();
            ConsoleLoggerManager loggerManager = new ConsoleLoggerManager();
            loggerManager.setThreshold("ERROR");
            container.setLoggerManager(loggerManager);

            builder = container.lookup(ProjectBuilder.class);

            // TODO this needs to be configurable via the project/.sidekick file.
            String localRepository = getUserHomeDir().getAbsolutePath() + "/.m2/repository";

            request.setLocalRepository(new MavenArtifactRepository(
                     "local", new File(localRepository).toURI().toURL().toString(),
                     container.lookup(ArtifactRepositoryLayout.class),
                     new ArtifactRepositoryPolicy(true, ArtifactRepositoryPolicy.UPDATE_POLICY_NEVER,
                              ArtifactRepositoryPolicy.CHECKSUM_POLICY_WARN),
                     new ArtifactRepositoryPolicy(true, ArtifactRepositoryPolicy.UPDATE_POLICY_NEVER,
                              ArtifactRepositoryPolicy.CHECKSUM_POLICY_WARN)));
            request.setRemoteRepositories(new ArrayList<ArtifactRepository>());

            DefaultRepositorySystemSession repositorySession = new DefaultRepositorySystemSession();
            repositorySession.setLocalRepositoryManager(new SimpleLocalRepositoryManager(localRepository));
            repositorySession.setOffline(true);

            request.setRepositorySession(repositorySession);
            request.setProcessPlugins(true);
            request.setResolveDependencies(true);
            // request.setOffline(true);

         }
         catch (Exception e)
         {
            throw new RuntimeException(e);
         }
      }
   }

   private boolean initialized()
   {
      return request == null;
   }

   /*
    * POM manipulation methods
    */
   public ProjectBuildingResult getProjectBuildingResult()
   {
      bootstrapMaven();
      try
      {
         ProjectBuildingResult buildingResult = builder.build(getPOMFile(), request);
         return buildingResult;
      }
      catch (ProjectBuildingException e)
      {
         throw new RuntimeException(e);
      }
   }

   private File getPOMFile()
   {
      File file = new File("pom.xml");
      return file;
   }

   private File getUserHomeDir()
   {
      return new File(System.getProperty("user.home")).getAbsoluteFile();
   }
}