/*
    * 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.maven.plugin.eclipse.writers;
  
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.OutputStreamWriter;
  import java.io.Writer;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.eclipse.BuildCommand;
  import org.apache.maven.plugin.eclipse.Constants;
  import org.apache.maven.plugin.eclipse.EclipseSourceDir;
  import org.apache.maven.plugin.eclipse.Messages;
  import org.apache.maven.plugin.ide.IdeDependency;
  import org.apache.maven.plugin.ide.IdeUtils;
  import org.codehaus.plexus.util.IOUtil;
  import org.codehaus.plexus.util.StringUtils;
  import org.codehaus.plexus.util.xml.PrettyPrintXMLWriter;
  import org.codehaus.plexus.util.xml.XMLWriter;
  
  /**
   * Writes eclipse .classpath file.
   *
   * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l</a>
   * @author <a href="mailto:kenney@neonics.com">Kenney Westerhof</a>
   * @author <a href="mailto:fgiust@apache.org">Fabrizio Giustina</a>
   * @version $Id: EclipseClasspathWriter.java 1672304 2015-04-09 12:04:28Z khmarbaise $
   */
  public class EclipseClasspathWriter
      extends AbstractEclipseWriter
  {
  
      /**
       *
       */
      private static final String ORG_ECLIPSE_AJDT_INPATH = "org.eclipse.ajdt.inpath";
  
      /**
       *
       */
      private static final String ORG_ECLIPSE_AJDT_ASPECTPATH = "org.eclipse.ajdt.aspectpath";
  
      private static final String ASPECTJRT_CONTAINER = "org.eclipse.ajdt.core.ASPECTJRT_CONTAINER";
  
      /**
       *
       */
      private static final String NAME = "name";
  
      /**
       *
       */
      private static final String VALUE = "value";
  
      /**
       *
       */
      private static final String ATTRIBUTE = "attribute";
  
      /**
       *
       */
      private static final String ATTRIBUTES = "attributes";
  
      /**
       * Eclipse build path variable M2_REPO
       */
      protected static final String M2_REPO = "M2_REPO"; //$NON-NLS-1$
  
      /**
       * Attribute for sourcepath.
       */
      private static final String ATTR_SOURCEPATH = "sourcepath"; //$NON-NLS-1$
  
      /**
      * Attribute for output.
      */
     private static final String ATTR_OUTPUT = "output"; //$NON-NLS-1$
 
     /**
      * Attribute for path.
      */
     private static final String ATTR_PATH = "path"; //$NON-NLS-1$
 
     /**
      * Attribute for kind - Container (con), Variable (var)..etc.
      */
     private static final String ATTR_KIND = "kind"; //$NON-NLS-1$
 
     /**
      * Attribute value for kind: var
      */
     private static final String ATTR_VAR = "var"; //$NON-NLS-1$
 
     /**
      * Attribute value for kind: lib
      */
     private static final String ATTR_LIB = "lib"; //$NON-NLS-1$
 
     /**
      * Attribute value for kind: src
      */
     private static final String ATTR_SRC = "src"; //$NON-NLS-1$
 
     /**
      * Attribute name for source file includes in a path.
      */
     private static final String ATTR_INCLUDING = "including";
 
     /**
      * Attribute name for source file excludes in a path.
      */
     private static final String ATTR_EXCLUDING = "excluding";
 
     /**
      * Element for classpathentry.
      */
     private static final String ELT_CLASSPATHENTRY = "classpathentry"; //$NON-NLS-1$
 
     /**
      * Element for classpath.
      */
     private static final String ELT_CLASSPATH = "classpath"; //$NON-NLS-1$
 
     /**
      * File name that stores project classpath settings.
      */
     private static final String FILE_DOT_CLASSPATH = ".classpath"; //$NON-NLS-1$
 
     /**
      * @see org.apache.maven.plugin.eclipse.writers.EclipseWriter#write()
      */
     public void write()
         throws MojoExecutionException
     {
 
         Writer w;
 
         try
         {
             w =
                 new OutputStreamWriter( new FileOutputStream( new File( config.getEclipseProjectDirectory(),
                                                                         FILE_DOT_CLASSPATH ) ), "UTF-8" );
         }
         catch ( IOException ex )
         {
             throw new MojoExecutionException( Messages.getString( "EclipsePlugin.erroropeningfile" ), ex ); //$NON-NLS-1$
         }
 
         XMLWriter writer = new PrettyPrintXMLWriter( w, "UTF-8", null );
 
         writer.startElement( ELT_CLASSPATH );
 
         String defaultOutput =
             IdeUtils.toRelativeAndFixSeparator( config.getProjectBaseDir(), config.getBuildOutputDirectory(), false );
 
         // ----------------------------------------------------------------------
         // Source roots and resources
         // ----------------------------------------------------------------------
 
         // List<EclipseSourceDir>
         List specialSources = new ArrayList();
 
         // Map<String,List<EclipseSourceDir>>
         Map byOutputDir = new HashMap();
 
         for ( int j = 0; j < config.getSourceDirs().length; j++ )
         {
             EclipseSourceDir dir = config.getSourceDirs()[j];
 
             // List<EclipseSourceDir>
             List byOutputDirs = (List) byOutputDir.get( dir.getOutput() );
             if ( byOutputDirs == null )
             {
                 // ArrayList<EclipseSourceDir>
                 byOutputDir.put( dir.getOutput() == null ? defaultOutput : dir.getOutput(), byOutputDirs =
                     new ArrayList() );
             }
             byOutputDirs.add( dir );
         }
 
         for ( int j = 0; j < config.getSourceDirs().length; j++ )
         {
             EclipseSourceDir dir = config.getSourceDirs()[j];
 
             log.debug( "Processing classpath for: " + dir.toString() + "; default output=" + defaultOutput );
 
             boolean isSpecial = false;
 
             // handle resource with nested output folders
             if ( dir.isResource() )
             {
                 // Check if the output is a subdirectory of the default output,
                 // and if the default output has any sources that copy there.
 
                 if ( dir.getOutput() != null // resource output dir is set
                     && !dir.getOutput().equals( defaultOutput ) // output dir is not default target/classes
                     && dir.getOutput().startsWith( defaultOutput ) // ... but is nested
                     && byOutputDir.get( defaultOutput ) != null // ???
                     && !( (List) byOutputDir.get( defaultOutput ) ).isEmpty() // ???
                 )
                 {
                     // do not specify as source since the output will be nested. Instead, mark
                     // it as a todo, and handle it with a custom build.xml file later.
 
                     log.debug( "Marking as special to prevent output folder nesting: " + dir.getPath() + " (output="
                         + dir.getOutput() + ")" );
 
                     isSpecial = true;
                     specialSources.add( dir );
                 }
             }
 
             writer.startElement( ELT_CLASSPATHENTRY );
 
             writer.addAttribute( ATTR_KIND, "src" ); //$NON-NLS-1$
             writer.addAttribute( ATTR_PATH, dir.getPath() );
 
             if ( !isSpecial && dir.getOutput() != null && !defaultOutput.equals( dir.getOutput() ) )
             {
                 writer.addAttribute( ATTR_OUTPUT, dir.getOutput() );
             }
 
             String includes = dir.getIncludeAsString();
             if ( StringUtils.isNotEmpty( includes ) )
             {
                 writer.addAttribute( ATTR_INCLUDING, includes );
             }
 
             String excludes = dir.getExcludeAsString();
             if ( StringUtils.isNotEmpty( excludes ) )
             {
                 writer.addAttribute( ATTR_EXCLUDING, excludes );
             }
 
             writer.endElement();
 
         }
 
         // handle the special sources.
         if ( !specialSources.isEmpty() )
         {
             log.info( "Creating maven-eclipse.xml Ant file to handle resources" );
 
             try
             {
                 Writer buildXmlWriter =
                     new OutputStreamWriter( new FileOutputStream( new File( config.getEclipseProjectDirectory(),
                                                                             "maven-eclipse.xml" ) ), "UTF-8" );
                 PrettyPrintXMLWriter buildXmlPrinter = new PrettyPrintXMLWriter( buildXmlWriter );
 
                 buildXmlPrinter.startElement( "project" );
                 buildXmlPrinter.addAttribute( "default", "copy-resources" );
 
                 buildXmlPrinter.startElement( "target" );
                 buildXmlPrinter.addAttribute( NAME, "init" );
                 // initialize filtering tokens here
                 buildXmlPrinter.endElement();
 
                 buildXmlPrinter.startElement( "target" );
                 buildXmlPrinter.addAttribute( NAME, "copy-resources" );
                 buildXmlPrinter.addAttribute( "depends", "init" );
 
                 for (Object specialSource : specialSources) {
                     // TODO: merge source dirs on output path+filtering to reduce
                     // <copy> tags for speed.
                     EclipseSourceDir dir = (EclipseSourceDir) specialSource;
                     buildXmlPrinter.startElement("copy");
                     buildXmlPrinter.addAttribute("todir", dir.getOutput());
                     buildXmlPrinter.addAttribute("filtering", "" + dir.isFiltering());
 
                     buildXmlPrinter.startElement("fileset");
                     buildXmlPrinter.addAttribute("dir", dir.getPath());
                     if (dir.getIncludeAsString() != null) {
                         buildXmlPrinter.addAttribute("includes", dir.getIncludeAsString());
                     }
                     if (dir.getExcludeAsString() != null) {
                         buildXmlPrinter.addAttribute("excludes", dir.getExcludeAsString());
                     }
                     buildXmlPrinter.endElement();
 
                     buildXmlPrinter.endElement();
                 }
 
                 buildXmlPrinter.endElement();
 
                 buildXmlPrinter.endElement();
 
                 IOUtil.close( buildXmlWriter );
             }
             catch ( IOException e )
             {
                 throw new MojoExecutionException( "Cannot create " + config.getEclipseProjectDirectory()
                     + "/maven-eclipse.xml", e );
             }
 
             log.info( "Creating external launcher file" );
             // now create the launcher
             new EclipseAntExternalLaunchConfigurationWriter().init( log, config, "Maven_Ant_Builder.launch",
                                                                     "maven-eclipse.xml" ).write();
 
             // finally add it to the project writer.
 
             config.getBuildCommands().add(
                                            new BuildCommand(
                                                              "org.eclipse.ui.externaltools.ExternalToolBuilder",
                                                              "LaunchConfigHandle",
                                                              "<project>/"
                                                                  + EclipseLaunchConfigurationWriter.FILE_DOT_EXTERNAL_TOOL_BUILDERS
                                                                  + "Maven_Ant_Builder.launch" ) );
         }
 
         // ----------------------------------------------------------------------
         // The default output
         // ----------------------------------------------------------------------
 
         writer.startElement( ELT_CLASSPATHENTRY );
         writer.addAttribute( ATTR_KIND, ATTR_OUTPUT );
         writer.addAttribute( ATTR_PATH, defaultOutput );
         writer.endElement();
 
         Set addedDependencies = new HashSet();
         
         // ----------------------------------------------------------------------
         // Java API dependencies that may complete the classpath container must
         // be declared BEFORE all other dependencies so that container access rules don't fail
         // ----------------------------------------------------------------------
         IdeDependency[] depsToWrite = config.getDeps();
         for (IdeDependency dep : depsToWrite) {
             if (dep.isJavaApi()) {
                 String depId = getDependencyId(dep);
                 if (!addedDependencies.contains(depId)) {
                     addDependency(writer, dep);
                     addedDependencies.add(depId);
                 }
             }
         }
         
 
         if (!config.isClasspathContainersLast())
         {
             writeClasspathContainers(writer);
         }
 
         // ----------------------------------------------------------------------
         // The project's dependencies
         // ----------------------------------------------------------------------
         for (IdeDependency dep : depsToWrite) {
             if (dep.isAddedToClasspath()) {
                 String depId = getDependencyId(dep);
                 /* avoid duplicates in the classpath for artifacts with different types (like ejbs or test-jars) */
                 if (!addedDependencies.contains(depId)) {
                     addDependency(writer, dep);
                     addedDependencies.add(depId);
                 }
             }
         }
 
         if (config.isClasspathContainersLast())
         {
             writeClasspathContainers(writer);
         }
         
         writer.endElement();
 
         IOUtil.close( w );
 
     }
 
     /**
      * @param writer
      */
     private void writeClasspathContainers(XMLWriter writer)
     {
         // ----------------------------------------------------------------------
         // Container classpath entries
         // ----------------------------------------------------------------------
 
         for (Object o : config.getClasspathContainers()) {
             writer.startElement(ELT_CLASSPATHENTRY);
             writer.addAttribute(ATTR_KIND, "con"); //$NON-NLS-1$
             writer.addAttribute(ATTR_PATH, (String) o);
             writer.endElement(); // name
         }
     }
 
     private String getDependencyId( IdeDependency dep )
     {
         String depId =
             dep.getGroupId() + ":" + dep.getArtifactId() + ":" + dep.getClassifier() + ":" + dep.getVersion();
 
         if ( dep.isReferencedProject() )
         {
             // This dependency will be refered as an eclipse project
             depId = dep.getEclipseProjectName();
         }
         return depId;
     }
 
     protected void addDependency( XMLWriter writer, IdeDependency dep )
         throws MojoExecutionException
     {
 
         String path;
         String kind;
         String sourcepath = null;
         String javadocpath = null;
 
         if ( dep.isReferencedProject() )
         {
             path = "/" + dep.getEclipseProjectName(); //$NON-NLS-1$
             kind = ATTR_SRC;
         }
         else
         {
             File artifactPath = dep.getFile();
 
             if ( artifactPath == null )
             {
                 log.error( Messages.getString( "EclipsePlugin.artifactpathisnull", dep.getId() ) ); //$NON-NLS-1$
                 return;
             }
 
             if ( dep.isSystemScoped() )
             {
                 path = IdeUtils.toRelativeAndFixSeparator( config.getEclipseProjectDirectory(), artifactPath, false );
 
                 if ( log.isDebugEnabled() )
                 {
                     log.debug( Messages.getString( "EclipsePlugin.artifactissystemscoped", //$NON-NLS-1$
                                                    new Object[] { dep.getArtifactId(), path } ) );
                 }
 
                 kind = ATTR_LIB;
             }
             else
             {
                 File localRepositoryFile = new File( config.getLocalRepository().getBasedir() );
 
                 String fullPath = artifactPath.getPath();
                 String relativePath =
                     IdeUtils.toRelativeAndFixSeparator( localRepositoryFile, new File( fullPath ), false );
 
                 if ( !new File( relativePath ).isAbsolute() )
                 {
                     path = M2_REPO + "/" //$NON-NLS-1$
                         + relativePath;
                     kind = ATTR_VAR; //$NON-NLS-1$
                 }
                 else
                 {
                     path = relativePath;
                     kind = ATTR_LIB;
                 }
 
                 if ( dep.getSourceAttachment() != null )
                 {
                     if ( ATTR_VAR.equals( kind ) )
                     {
                         sourcepath =
                             M2_REPO
                                 + "/" //$NON-NLS-1$
                                 + IdeUtils.toRelativeAndFixSeparator( localRepositoryFile, dep.getSourceAttachment(),
                                                                       false );
                     }
                     else
                     {
                         // source archive must be referenced with the full path, we can't mix a lib with a variable
                         sourcepath = IdeUtils.getCanonicalPath( dep.getSourceAttachment() );
                     }
                 }
 
                 if ( dep.getJavadocAttachment() != null )
                 {
                     // NB eclipse (3.1) doesn't support variables in javadoc paths, so we need to add the
                     // full path for the maven repo
                     javadocpath = IdeUtils.fixSeparator( IdeUtils.getCanonicalPath( dep.getJavadocAttachment() ) );
                 }
 
             }
 
         }
 
         // Replace aspectJ runtime library with ajdt ASPECTJRT_CONTAINER.
         if ( ( config.getAjdtVersion() != 0 ) && isAspectJRuntime( dep ) )
         {
             if ( ! config.getClasspathContainers().contains( ASPECTJRT_CONTAINER ) )
             {
                 config.getClasspathContainers().add( ASPECTJRT_CONTAINER );
             }
             return;
         }
 
         writer.startElement( ELT_CLASSPATHENTRY );
         writer.addAttribute( ATTR_KIND, kind );
         writer.addAttribute( ATTR_PATH, path );
 
         if ( sourcepath != null )
         {
             writer.addAttribute( ATTR_SOURCEPATH, sourcepath );
         }
 
         boolean attributeElemOpen = false;
 
         if ( javadocpath != null )
         {
             if ( !attributeElemOpen )
             {
                 writer.startElement( ATTRIBUTES ); //$NON-NLS-1$
                 attributeElemOpen = true;
             }
 
             writer.startElement( ATTRIBUTE ); //$NON-NLS-1$
             writer.addAttribute( VALUE, "jar:" + new File( javadocpath ).toURI() + "!/" ); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
             writer.addAttribute( NAME, "javadoc_location" ); //$NON-NLS-1$ //$NON-NLS-2$
             writer.endElement();
 
         }
 
         if ( Constants.PROJECT_PACKAGING_WAR.equals( this.config.getPackaging() ) && config.getWtpapplicationxml()
             && kind.equals( ATTR_VAR ) && !dep.isTestDependency() && !dep.isProvided()
             && !dep.isSystemScopedOutsideProject( this.config.getProject() ) )
         {
             if ( !attributeElemOpen )
             {
                 writer.startElement( ATTRIBUTES ); //$NON-NLS-1$
                 attributeElemOpen = true;
             }
 
             writer.startElement( ATTRIBUTE ); //$NON-NLS-1$
             writer.addAttribute( VALUE, "/WEB-INF/lib" ); //$NON-NLS-1$ //$NON-NLS-2$
             writer.addAttribute( NAME, "org.eclipse.jst.component.dependency" ); //$NON-NLS-1$ //$NON-NLS-2$
             writer.endElement();
 
         }
 
         if ( dep.isAjdtDependency() && ( config.getAjdtVersion() >= 1.5 ) )
         {
             if ( !attributeElemOpen )
             {
                 writer.startElement( ATTRIBUTES ); //$NON-NLS-1$
                 attributeElemOpen = true;
             }
 
             writer.startElement( ATTRIBUTE ); //$NON-NLS-1$
             writer.addAttribute( NAME, ORG_ECLIPSE_AJDT_ASPECTPATH ); //$NON-NLS-1$ //$NON-NLS-2$
             writer.addAttribute( VALUE, Boolean.TRUE.toString() ); //$NON-NLS-1$ //$NON-NLS-2$
             writer.endElement();
 
         }
 
         if ( dep.isAjdtWeaveDependency() && ( config.getAjdtVersion() >= 1.5 ) )
         {
             if ( !attributeElemOpen )
             {
                 writer.startElement( ATTRIBUTES ); //$NON-NLS-1$
                 attributeElemOpen = true;
             }
 
             writer.startElement( ATTRIBUTE ); //$NON-NLS-1$
             writer.addAttribute( NAME, ORG_ECLIPSE_AJDT_INPATH ); //$NON-NLS-1$ //$NON-NLS-2$
             writer.addAttribute( VALUE, Boolean.TRUE.toString() ); //$NON-NLS-1$ //$NON-NLS-2$
             writer.endElement();
 
         }
 
         if ( attributeElemOpen )
         {
             writer.endElement();
         }
         writer.endElement();
 
     }
 
     /**
      * @return
      */
     private boolean isAspectJRuntime( IdeDependency dep )
     {
         if ( dep.getArtifactId().equals( "aspectjrt" ) )
         {
             return dep.getGroupId().equals( "org.aspectj" ) || dep.getGroupId().equals( "aspectj" );
         }
         return false;
     }
 }