/*
    * #%L
    * License Maven Plugin
    * 
    * $Id: LicenseListMojo.java 13616 2011-02-14 11:38:39Z tchemit $
    * $HeadURL: http://svn.codehaus.org/mojo/tags/license-maven-plugin-1.0/src/main/java/org/codehaus/mojo/license/LicenseListMojo.java $
    * %%
    * Copyright (C) 2008 - 2011 CodeLutin, Codehaus, Tony Chemit
    * %%
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU Lesser General Public License as 
   * published by the Free Software Foundation, either version 3 of the 
   * License, or (at your option) any later version.
   * 
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Lesser Public License for more details.
   * 
   * You should have received a copy of the GNU General Lesser Public 
   * License along with this program.  If not, see
   * <http://www.gnu.org/licenses/lgpl-3.0.html>.
   * #L%
   */
  
  package org.codehaus.mojo.license;
  
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoFailureException;
  import org.codehaus.mojo.license.model.License;
  import org.codehaus.mojo.license.model.LicenseStore;
  
  import java.io.IOException;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  
  /**
   * Display all available licenses.
   *
   * @author tchemit <chemit@codelutin.com>
   * @goal license-list
   * @requiresProject false
   * @requiresDirectInvocation
   * @since 1.0
   */
  public class LicenseListMojo
      extends AbstractLicenseMojo
  {
  
      /**
       * the url of an extra license repository.
       *
       * @parameter expression="${extraResolver}"
       * @since 1.0
       */
      private String extraResolver;
  
      /**
       * A flag to display also the content of each license.
       *
       * @parameter expression="${detail}"
       * @since 1.0
       */
      private boolean detail;
  
      /**
       * store of licenses
       */
      protected LicenseStore licenseStore;
  
      @Override
      protected void init()
          throws Exception
      {
  
          // obtain licenses store
          licenseStore = LicenseStore.createLicenseStore( getLog(), getExtraResolver() );
      }
  
      @Override
      public void doAction()
          throws MojoExecutionException, MojoFailureException
      {
          StringBuilder buffer = new StringBuilder();
  
          if ( isVerbose() )
          {
              buffer.append( "\n\n-------------------------------------------------------------------------------\n" );
              buffer.append( "                           maven-license-plugin\n" );
              buffer.append( "-------------------------------------------------------------------------------\n\n" );
          }
          buffer.append( "Available licenses :\n\n" );
  
          List<String> names = Arrays.asList( licenseStore.getLicenseNames() );
  
          int maxLength = 0;
          for ( String name : names )
          {
             if ( name.length() > maxLength )
             {
                 maxLength = name.length();
             }
         }
         Collections.sort( names );
 
         String pattern = " * %1$-" + maxLength + "s : %2$s\n";
         for ( String licenseName : names )
         {
             License license = licenseStore.getLicense( licenseName );
             buffer.append( String.format( pattern, licenseName, license.getDescription() ) );
             if ( isDetail() )
             {
                 try
                 {
                     buffer.append( "\n" );
                     buffer.append( license.getHeaderContent( getEncoding() ) );
                     buffer.append( "\n\n" );
                 }
                 catch ( IOException ex )
                 {
                     throw new MojoExecutionException(
                         "could not instanciate license with name " + licenseName + " for reason " + ex.getMessage(),
                         ex );
                 }
             }
         }
         getLog().info( buffer.toString() );
     }
 
     public String getExtraResolver()
     {
         return extraResolver;
     }
 
     public boolean isDetail()
     {
         return detail;
     }
 
     public void setExtraResolver( String extraResolver )
     {
         this.extraResolver = extraResolver;
     }
 
     public void setDetail( boolean detail )
     {
         this.detail = detail;
     }
 }