/**
    * Copyright 2010-2012 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.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;
     }
 }