package net.sf.statscm;
   
   /*
    * Copyright 2006 Doug Culnane
    *
    * 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 net.sf.statsvn.util.SvnStartupUtils;
  import net.sf.statsvn.util.SvnVersionMismatchException;
  import net.sf.statcvs.Messages;
  import net.sf.statcvs.input.LogSyntaxException;
  import net.sf.statcvs.output.CommandLineParser;
  import net.sf.statsvn.output.SvnCommandLineParser;
  import net.sf.statsvn.output.SvnConfigurationOptions;
  import net.sf.statcvs.output.ConfigurationException;
  import org.apache.maven.doxia.sink.Sink;
  import org.apache.maven.doxia.siterenderer.Renderer;
  import org.apache.maven.reporting.AbstractMavenReport;
  import org.apache.maven.reporting.MavenReportException;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.util.Locale;
  import java.util.ResourceBundle;
  
  import org.apache.maven.model.Reporting;
  import org.apache.maven.project.MavenProject;
  
  /**
   * Generate a Source Code Management Metrics Report.
   * 
   * @goal stats
   * @phase site
   */
  public class StatScmMojo extends AbstractMavenReport
  {
  
      /**
       * Maven Project. This represents the POM where StatSCM gets most of its configuration from. This object is provided
       * by Maven.
       * 
       * @parameter expression="${project}"
       * @required
       * @readonly
       */
      private MavenProject project;
  
      /**
       * Each <include> tag inside here gives one Ant-style wildcard pattern indicating what to include. Example:
       * "src / ** / *.java" matches all java files in the src directory or its subdirectories. Note that "*.java "only
       * matches java files in the root directory, because '*' does not match subdirectories. (Quotes not needed.)<br/>
       * <br/>
       * If not specified, all files will be included.<br/>
       * <br/>
       * First we add in all files or all these files and then we subtract all the excluded files.
       * 
       * @parameter
       */
      private String[] includes;
  
      /**
       * Each &lt;exclude&gt; tag inside here gives one Ant-style wildcard pattern indicating what to exclude. Example:
       * "** /test/*.java" matches all java files in with a 'test' folder somewhere in the path. Note that "*.java" only
       * matches java files in the root directory, because '*' does not match subdirectories. (Quotes not needed.)<br/>
       * <br/>
       * If not specified, no files will be excluded.<br/>
       * <br/>
       * First we add in all files or all these files and then we subtract all the excluded files.
       * 
       * @parameter
       */
      private String[] excludes;
  
      /**
       * Each &lt;nonDeveloperLogin&gt; tag in inside here gives one scm login account name. Each account name given here
       * will be excluded from all developer reports. This is useful to reduce noise from administrative and other
       * non-developer accounts. <br/>
       * <br/>
       * Multiple accounts can be excluded by adding a tag for each such account.
       * 
       * @parameter
       */
      private String[] nonDeveloperLogins;
  
      /**
      * Specify a cache directory for information retrieved from the Subversion server (e.g. line counts). The data will
      * be saved in this directory. The directory will be created if it doesn't exist. By default, the current user
      * directory is used. This is only relevant when the SCM is subversion and is ignored if it is CVS.
      * 
      * @parameter
      */
     private String cacheDir;
 
     /**
      * The contents of the specified file will be included at the top of the report's index page. The file should
      * contain a valid block-level HTML fragment, for example: <br/>
      * 
      * <pre>
      * &lt;p&gt;
      *     These are development statistics for the
      *     &lt;a href=&quot;http://www.statsvn.org&quot;&gt;StatSVN&lt;/a&gt;
      *     project, created by StatSVN itself.
      * &lt;/p&gt;
      * &lt;p&gt;
      *     &lt;strong&gt;Note:&lt;/strong&gt;
      *     This report was generated by an unreleased
      *     development version of StatSVN. It might
      *     contain features not yet found in the
      *     official release.
      * &lt;/p&gt;
      * </pre>
      * 
      * 
      */
     private String notesFile;
     
     /**
      * The config file allows you to set some user or chart configurations.
      * 
      * @see http://statcvs.sourceforge.net/manual.html#section_config
      * @parameter
      */
    	private String configFile = "src/site/stat-scm.properties";
     
 	/**
      * Set this true to avoid running the stat-scm report in this project. Useful in child projects where the parent pom 
      * project specifies the stat-scm report.
      * 
      * @parameter expression="false"
      */
     private boolean skip;
 
     /**
      * Specifies a display title to be used in the reports. The setting in &lt;project&gt;&lt;name&gt; is used if no
      * title is specified here and the name of the Subversion module will be used as default if no title is otherwise
      * specified.
      * 
      * @parameter
      */
     private String title;
 
     /**
      * Configuration for this instance.
      */
     private StatConf statConf = new StatConf();
     
     /**
      * For running directly.
      * @todo This direct call should generate HTML reports by changing the output from Xdoc to html and the outputDir.
      */
     public void execute()
     {
         getLog().error( "StatSCM can not be run directly!" );
         getLog().info( "Configure it to run with the \"mvn site\" command." );
         getLog().info( "See: http://sourceforge.net/tracker/index.php?func=detail&aid=1610964&group_id=182522&atid=901553." );
     }
 
     /**
      * Main mojo execution method called by plugin environment.
      * 
      * @param locale Locale for 118n.
      * @throws MavenReportException
      *             Throws an error if any failure.
      */
     public void executeReport( Locale locale ) throws MavenReportException
     {
         if (skip) 
         {
             getLog().info( getMessage("info.greeting.skip") );
         }
         else
         {
             // Start
             getLog().info( getMessage("info.greeting.ok") );
             
             // Configure
             try
             {
                 getLog().info( "StatSCM Version:" + getStatSCMVersion() );
                 getLog().info( "Configuring StatXXX" );
                 StatConf.setConfigFile(configFile);
                 statConf.configure( project, locale );
                 configFromMojoProperties();
                 getLog().info( "SCM Connection Type :" + statConf.getConnectionType() );
                 getLog().info( "Output Directory    :" + this.getOutputDirectory() );
             }
             catch ( ConfigurationException e )
             {
                 getLog().error( getMessage( "error.config" ), e );
                 return;
             }
     
             // Get the Log file
             SrcManager scm = new SrcManager();
             if ( !scm.log( statConf.getBaseDirectory(), getLog(), statConf ) )
             {
                 getLog().error( getMessage( "error.scmlog.file_missing" ) );
                 return;
             }
     
             // Create Output dirs
             if ( !createOutputDirectory() )
             {
                 getLog().error( getMessage( "error.ouput.can_not_create_output_folder" )  );
                 return;
             }
     
             // Perform report
             try
             {
                 if ( statConf.isStatSVN() || statConf.isStatCVS() )
                 {
                     if ( statConf.isStatSVN() )
                     {
                         doSvnStats();
                     }
                     else if ( statConf.isStatCVS() )
                     {
                         doCvsStats();
                     }
                     doGenerateReport( getSink() );
                     copyResourceFiles( getOutputDirectory(), getReportingTargetDirectory() );
                 }
                 else
                 {
                     getLog().error( getMessage( "warn.scm.type_xxx" ) );
                 }
             }
             catch ( Exception e )
             {
                 getLog().error( getMessage( "error.config" ), e );
             }
         }        
     }
 
     /**
      * Use StatSVN to generate xDoc output.
      * 
      * @throws MavenReportException if there is an error.
      */
     private void doSvnStats() throws MavenReportException
     {
         Messages.setPrimaryResource( "net.sf.statsvn.statcvs" );
         try
         {
             Messages.setPrimaryResource( "net.sf.statsvn.statcvs" );
             new SvnCommandLineParser( new String[] { statConf.getSCMLogFileName(), "." } ).parse();
             SvnStartupUtils.checkSvnVersionSufficient();
             SvnStartupUtils.checkRepoRootAvailable();
             net.sf.statsvn.Main.generateDefaultHTMLSuite();
         }
         catch ( LogSyntaxException e )
         {
             getLog().error( getMessage( "error.scmlog.parsing" ), e );
             throw new MavenReportException( e.getMessage() );
         }
         catch ( IOException e )
         {
             getLog().error( "Error generating Subversion Stats.", e );
             throw new MavenReportException( e.getMessage() );
         }
         catch ( ConfigurationException e )
         {
             getLog().error( getMessage( "error.config" ), e );
             throw new MavenReportException( e.getMessage() );
 
         }
         catch ( SvnVersionMismatchException e )
         {
             getLog().error( e.getMessage(), e );
             throw new MavenReportException( e.getMessage() );
         }
         catch ( NullPointerException e )
         {
         	getLog().warn("Null Pointer: Sometimes happens when local files are not synced with the repository!");
             getLog().error( e.getMessage(), e );
             //throw new MavenReportException( e.getMessage() );
         }
     }
 
     /**
      * Use StatCVS to generate xDoc output.
      * 
      * @throws MavenReportException if there is an error.
      */
     private void doCvsStats() throws MavenReportException
     {
 
         try
         {
             new CommandLineParser( new String[] { statConf.getSCMLogFileName(), "." } ).parse();
             net.sf.statcvs.Main.generateDefaultHTMLSuite();
         }
         catch ( LogSyntaxException e )
         {
             getLog().error( getMessage( "error.scmlog.parsing" ), e );
             throw new MavenReportException( e.getMessage() );
         }
         catch ( IOException e )
         {
             getLog().error( "Error generating Subversion Stats.", e );
             throw new MavenReportException( e.getMessage() );
         }
         catch ( ConfigurationException e )
         {
             getLog().error( getMessage( "error.config" ), e );
             throw new MavenReportException( e.getMessage() );
         }
     }
 
     /**
      * Create the output directory for generated xdoc output.
      * 
      * @return True if directory there or was sucessfully created.
      */
     private boolean createOutputDirectory()
     {
         File outputDir = new File( getOutputDirectory() );
         if ( outputDir.exists() )
         {
             if ( outputDir.isDirectory() )
             {
                 return true;
             }
             else
             {
                 getLog().error( getMessage( "error.outputDir.file_in_the_way" )
                                                 + outputDir.getAbsolutePath() );
                 return false;
             }
         }
         else
         {
             if ( outputDir.mkdirs() )
             {
                 return true;
             }
             else
             {
                 getLog().error( "Can  not make output directory at: " + outputDir.getAbsolutePath() );
                 return false;
             }
         }
     }
 
     /**
      * Use settings in the POM to configure some more things for STATSCM.
      * 
      * @throws ConfigurationException if any of the POM settings are invalid 
      */
     private void configFromMojoProperties() throws ConfigurationException
     {
         configIncludeExclude();
         configNonDeveloperLogins();
         configCacheSettings();
         configNotesFile();
         configTitle();        
     }
 
     /**
      * Use POM content to set the title appearing on the window. This takes precedence over the name of the POM project
      * name, which is the default title.
      */
     private void configTitle()
     {
         if ( title != null )
         {
             String projectName = title.trim();
             if ( projectName.length() > 0 )
             {
                 statConf.setProjectName( projectName );
             }
             getLog().info( "Page title: " + statConf.getProjectName() );
         }
     }
 
     /**
      * Use POM settings to configure a 'notes' file holding HTML to appear at the top of pages.
      * 
      * @throws ConfigurationException if the notes file can't be used
      */
     private void configNotesFile() throws ConfigurationException
     {
         if ( notesFile != null )
         {
             String filename = notesFile.trim();
             if ( filename.length() > 0 )
             {
                 try
                 {
                     statConf.setNotesFile( filename );
                     getLog().info( "Notes file: " + filename );
                 }
                 catch ( ConfigurationException e )
                 {
                     getLog().info( "Notes file: " + filename );
                     throw e;
                     // @todo: convert this to use message file
 //                    getLog().error( e.getMessage() );
                 }
             }
         }
     }
 
     /**
      * Use POM setting to configure where the cache file is stored.
      * 
      * @throws ConfigurationException if the cache folder cannot be used
      */
     private void configCacheSettings() throws ConfigurationException
     {
         if ( cacheDir != null )
         {
             String dir = cacheDir.trim();
             if ( dir.length() > 0 )
             {
                 try
                 {
                     SvnConfigurationOptions.setCacheDir( dir );
                     getLog().info( "Cache directory: " + dir );
                 }
                 catch ( ConfigurationException e )
                 {
                     getLog().info( "Cache directory: " + dir );
                     throw e;
 //                    getLog().error( getMessage( "error.config.bad_cache_dir" ) + dir );
                 }
             }
         }
     }
 
     /**
      * Use the parameters configured in the POM to set things up for the list of files that will be included or
      * excluded.
      */
     private void configIncludeExclude()
     {
         String patternList = buildIncludeExcludeString( includes );
         if ( patternList.length() > 0 )
         {
             statConf.setIncludePattern( patternList );
             getLog().info( "Includes: " + patternList );
         }
         else
         {
             getLog().info( "Include all" );
         }
 
         patternList = buildIncludeExcludeString( excludes );
         if ( patternList.length() > 0 )
         {
             statConf.setExcludePattern( patternList );
             getLog().info( "Excludes: " + patternList );
         }
         else
         {
             getLog().info( "Exclude none" );
         }
     }
 
     /**
      * Convert an array of strings to a single semi-colon delimited string of the values. Blank values are discarded.
      * 
      * @return the delimited string or an empty string if there are no non-blank values.
      */
     protected String buildIncludeExcludeString( String[] list )
     {
         StringBuffer patternList;
         patternList = new StringBuffer();
         if ( list != null )
         {
             for ( int i = 0; i < list.length; i++ )
             {
                 String include = list[i].trim();
                 if ( include.indexOf( ';' ) > 0 )
                 {
                     getLog().warn(
                             getMessage( "warn.config.include.exclude.delimiter.1" ) + " ':' "
                                     + getMessage( "warn.config.include.exclude.delimiter.2" ) + include );
                 }
                 if ( include.indexOf( ':' ) > 0 )
                 {
                     getLog().warn(
                             getMessage( "warn.config.include.exclude.delimiter.1" ) + " ';' "
                                     + getMessage( "warn.config.include.exclude.delimiter.2" ) + include );
                 }
                 if ( include.length() > 0 )
                 {
                     if ( patternList.length() > 0 )
                     {
                         patternList.append( ';' );
                     }
                     patternList.append( list[i] );
                 }
             }
         }
         return patternList.toString();
     }
 
     /**
      * Set the list of non-developers so these guys will be ignored in SCM info.
      */
     private void configNonDeveloperLogins()
     {
         if ( nonDeveloperLogins != null )
         {
             for ( int i = 0; i < nonDeveloperLogins.length; i++ )
             {
                 String login = nonDeveloperLogins[i].trim();
                 if ( login.length() > 0 )
                 {
                     statConf.addNonDeveloperLogin( login );
                     getLog().info( "Non-developer login: " + login );
                 }
             }
         }
     }
 
     /**
      * Called my Maven Repoerint API.
      * 
      * @return Null becuase we handel the rendering ourselves.
      */
     protected Renderer getSiteRenderer()
     {
         return null;
     }
 
     /**
      * String repesentation of the output generated XDOC Directory.
      * 
      * @return Absolute path to the generated XDOC Directory.
      */
     protected String getOutputDirectory()
     {
         return StatConf.getOutputDir();
     }
 
     /**
      * Returns the StatSCM report target directory.
      * 
      * @return Absolute path to the directory with final HTML result.
      */
     protected String getReportingTargetDirectory()
     {
         String targetBaseDirectory = null;
         Reporting reporting = getProject().getReporting();
         if ( reporting != null)
         {
             targetBaseDirectory = reporting.getOutputDirectory();
         }
         if ( targetBaseDirectory == null)
         {
             targetBaseDirectory = statConf.getBaseDirectory().getAbsolutePath()
                             + statConf.FILE_SEPARATOR + "target"
                             + statConf.FILE_SEPARATOR + "site";
         }
         return targetBaseDirectory + statConf.FILE_SEPARATOR + StatConf.STATSCM_DIR_NAME;
     }
 
     /**
      * String name of the html file that the Reporting Menu uses for a link.
      * 
      * @return Name of Html file to link to.
      */
     public String getOutputName()
     {
         return StatConf.STATSCM_DIR_NAME + "/statscm";
     }
 
     /**
      * Menu Item name for Reporting API.
      * 
      * @param locale
      *            Locale for i18n.
      * @return link menu name.
      */
     public String getName( Locale locale )
     {
         return "StatSCM";
     }
 
     /**
      * Description of Report for Reporting API.
      * 
      * @param loc Locale fro 118n.
      * @return i18n Description of Report.
      */
     public String getDescription( Locale loc )
     {
         return getMessage( "statscm.description" );
     }
 
     /**
      * Utility method for copying resource files.
      * 
      * @param src
      *            Source Directory.
      * @param dest
      *            Target Directory.
      */
     private void copyResourceFiles( String src, String dest )
     {
     	getLog().info("Copying resources from " + src + " to " + dest);
     	
         File srcDir = new File( src );
         if ( !srcDir.isDirectory() )
         {
             getLog().error( "Can not copy reources src is not a directory: " + srcDir.getAbsolutePath() );
             return;
         }
         File destDir = new File( dest );
         if ( !destDir.isDirectory() )
         {
             destDir.mkdirs();
         }
 
         String[] resoures = srcDir.list( new java.io.FilenameFilter()
         {
             public boolean accept( File dir, String name )
             {
                 String[] extensions = { ".png", ".jar", ".txt" };
                 String fileName = name.toLowerCase( Locale.getDefault() );
                 for ( int i = 0; i < extensions.length; i++ )
                 {
                     if ( fileName.endsWith( extensions[i] ) )
                     {
                         return true;
                     }
                 }
                 return false;
 
             }
         } );
 
         for ( int i = 0; i < resoures.length; i++ )
         {
             FileInputStream fis = null;
             FileOutputStream fos = null;
             try
             {
                 fis = new FileInputStream( new File( src + statConf.FILE_SEPARATOR + resoures[i] ) );
                 fos = new FileOutputStream( new File( dest + statConf.FILE_SEPARATOR + resoures[i] ) );
                 int b = -1;
                 while ( ( b = fis.read() ) != -1 )
                 {
                     fos.write( b );
                 }
 
                 fis.close();
                 fos.close();
             }
             catch ( FileNotFoundException e )
             {
                 getLog().error( "Can not find file " + resoures[i], e );
             }
             catch ( IOException e )
             {
                 getLog().error( "Error copying file: " + src + "/" + resoures[i], e );
             }
             finally
             {
                 try
                 {
                     if ( fis != null )
                     {
                         fis.close();
                     }
                     if ( fos != null )
                     {
                         fos.close();
                     }
                 }
                 catch ( IOException e )
                 {
                     getLog().error( "I/O Exception copying resources.", e );
                 }
                 finally
                 {
                     fis = null;
                     fos = null;
                 }
             }
             if ( getLog().isDebugEnabled() )
             {
                 getLog().debug(
                                 "Copied file " + src + statConf.FILE_SEPARATOR + resoures[i] + " to " + dest
                                                 + statConf.FILE_SEPARATOR + resoures[i] );
             }
         }
     }
 
     /**
      * Create a structured StatSCM / StatSVN report front page.
      * 
      * @param sink
      *            used to write structured report to.
      */
     private void doGenerateReport( Sink sink )
     {
 
         // protect against direct runs.
         if ( sink == null )
         {
             return;
         }
         
         sink.head();
         sink.title();
         sink.text( "StatSCM" );
         sink.title_();
         sink.head_();
 
         sink.body();
         sink.section1();
 
         sink.sectionTitle1();
         sink.text( getDescription( Locale.getDefault() ) );
         sink.sectionTitle1_();
 
         sink.bold();
         sink.link( "index.html" );
         sink.text( "Main page" );
         sink.link_();
         sink.bold_();
         // sink.link_();
         sink.lineBreak();
 
         // TODO Think about adding first page links this back in once the StatSVN and StatCVS output stableises.
 
         sink.link( "index.html" );
         sink.figure();
         sink.figureGraphics( "loc.png" );
         sink.figure_();
         sink.link_();
         sink.lineBreak();
 
         sink.text( "Generated using " );
         sink.link( "http://stat-scm.sourceforge.net/" );
         sink.text( "StatSCM" + getStatSCMVersion() );
         sink.link_();
         sink.text( "." );
 
         sink.flush();
         sink.close();
     }
 
     /**
      * Get the version of StatSCM.  This uses the filtered resource so that 
      * Maven automatically sets this at build time.
      *
      * @return The pom.version or an empty string if this fails.
      */
     private String getStatSCMVersion() {
         String versionText = getMessage("statscm.version");
         if (versionText == null) {
             return "";
         } else if (versionText.equals("${pom.version}")) {
             return "";
         }
         
         return " (" + versionText +")";
     }
 
     /**
      * Access to the Maven Project representation for Reporting API.
      * 
      * @return MavenProject.
      */
     protected MavenProject getProject()
     {
         return project;
     }
 
     /**
      * Setter to allow unit tests to set up Mojo.
      * 
      * @param project Maven Project
      */
     public void setProject( MavenProject project )
     {
         this.project = project;
     }
     
     public String getMessage(String messageKey) {
         return ResourceBundle.getBundle( "net.sf.statscm.message", statConf.getLocale() ).getString( messageKey );
     }
 
     void setSkipParameter( boolean b )
     {
         skip = b;
     }
 
 	public StatConf getStatConf() {
 		return statConf;
 	}
 
 	public void setConfigFileParameter(String configFile) throws ConfigurationException {
 		if (configFile != null) {
 			this.configFile = configFile;
 		}
 	}
 }