/*
 *                 Sun Public License Notice
 *
 * The contents of this file are subject to the Sun Public License
 * Version 1.0 (the "License"). You may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.sun.com/
 *
 * The Original Code is NetBeans. The Initial Developer of the Original
 * Code is Sun Microsystems, Inc. Portions Copyright 1997-2003 Sun
 * Microsystems, Inc. All Rights Reserved.
 */

package org.netbeans.nbbuild;

import org.apache.tools.ant.*;
import org.apache.tools.ant.util.*;
import org.apache.tools.ant.taskdefs.*;
import org.apache.tools.ant.types.FileSet;
import java.io.*;
import java.util.*;

/** This task copies the localizable files to a directory.
 * This task uses the L10nTask's getLocalizableFiles() function
 * to get the list of localizable files for each module.
 */
public class GetL9eFiles extends Task {

  /** The name of file that contains the localizable file
   * regular expressions.
   * 
Default: l10n.list
   */
  protected String listFile = "l10n.list";

  /** The grandparent directory of the l10n.list files.
   * 
Default: ..
   */
  protected String baseDir = "..";
  protected File grandParent = null ;

  /** The target directory to copy all translatable files to.
   * 
Default: src-todo
   */
  protected File targetDir = null ;

  /** List of exclude patterns that override the listFiles.
   * 
Default: Ja localized files
   */
  protected String excludes = "**/ja/,**/*_ja.*" ;

  /** Used internally. */
  protected FileUtils fileUtils = null ;

  public void setBaseDir(String s) {
    File f ;

    baseDir = s;
    f = new File( antBaseDir() + baseDir) ;
    try {
      grandParent = new File( f.getCanonicalPath()) ;
    }
    catch( Exception e) {
      e.printStackTrace();
      throw new BuildException() ;
    }
  }
  public void setListFile( String s) {
    listFile = s ;
  }
  public void setTargetDir( File f) {
    targetDir = f ;
  }
  public void setExcludes( String s) {
    excludes = s ;
  }

  /** A file filter that accepts only directories
   */
  class DirectoryFilter implements FileFilter {
    public boolean accept(File f) {
      return( f.isDirectory()) ;
    }
  }

  class TarFileFilter implements FileFilter {
    public boolean accept(File f) {
      return( f.getName().endsWith( ".tar")) ;
    }
  }

  public void execute() throws BuildException {
    File module ;
    LinkedList modules ;
    ListIterator iter ;

    if( targetDir == null) {
      targetDir = new File( antBaseDir() + "src-todo") ;
    }

    // If needed, setup the grandParent variable. //
    if( grandParent == null) {
      setBaseDir( baseDir) ;
    }

    // For each module with a list file. //
    modules = getModulesWithListFiles() ;
    iter = modules.listIterator() ;
    while( iter.hasNext()) {
      module = (File) iter.next() ;

      // Copy the module's localizable files. //
      copyL9eFiles( module) ;
    }
  }

  protected void copyL9eFiles( File module) {
    String[] l9eFiles, changedFiles ;
    int i ;
    File fromFile, toFile ;
    L10nTask l10nTask ;

    // Setup the file utils. //
    if( fileUtils == null) {
      fileUtils = FileUtils.newFileUtils() ;
    }

    // Use the l10n task to read the list file and get a list of the //
    // localizable files.					     //
    project.addTaskDefinition( "l10nTask", L10nTask.class) ;
    l10nTask = (L10nTask) project.createTask( "l10nTask") ;
    l10nTask.init() ;
    l10nTask.setLocalizableFile( listFile) ;
    l10nTask.setExcludePattern( excludes) ;
    l9eFiles = l10nTask.getLocalizableFiles( grandParent, module.getName()) ;
    if( l9eFiles != null) {

      // Get a list of the files that have changed. //
      changedFiles = getChangedFiles( l9eFiles) ;

      // Copy the localizable files that have changed. //
      if( changedFiles != null && changedFiles.length > 0) {
	log( "Copying " + changedFiles.length + " files to " + targetDir.getPath()) ;
	for( i = 0; i < changedFiles.length; i++) {
	  fromFile = new File( changedFiles[i]) ;
	  toFile = new File( mapL9eFile( changedFiles[i],
					 targetDir.getPath(),
					 grandParent.getPath())) ;
	  try {
	    //log("Copying " + fromFile.getPath() + " to " + toFile.getPath()) ;
	    fileUtils.copyFile( fromFile, toFile) ;
	  } catch (IOException ioe) {
	    String msg = "Failed to copy " + fromFile.getPath() + " to " +
	      toFile.getPath() + " due to " + ioe.getMessage();
	    throw new BuildException(msg, ioe, location);
	  }
	}
      }
    }
  }

  protected String[] getChangedFiles( String[] files) {
    L9eMapper mapper = new L9eMapper() ;
    mapper.setFrom( grandParent.getPath()) ;
    mapper.setTo( targetDir.getPath()) ;

    SourceFileScanner ds = new SourceFileScanner( this);
    return( ds.restrict( files, null, null, mapper)) ;
  }

  protected class L9eMapper implements FileNameMapper {

    protected String m_grandParent ;
    protected String m_toDir ;

    public void setFrom(String from) {
      m_grandParent = from ;
    }

    public void setTo(String to) {
      m_toDir = to ;
    }

    // Returns an one-element array containing the destination file //
    // name.							    //
    public String[] mapFileName(String file) {
      return new String[] { GetL9eFiles.mapL9eFile( file, m_toDir, m_grandParent) } ;
    }
  }

  protected static String mapL9eFile( String file, String toDir, 
				      String grandParentName) {
    return toDir + file.substring( grandParentName.length()) ;
  }

  protected LinkedList getModulesWithListFiles() {
    File module, list ;
    File[] parents ;
    LinkedList modules = new LinkedList() ;
    int i ;

    parents = grandParent.listFiles( new DirectoryFilter()) ;
    for( i = 0; i < parents.length; i++) {
      module = parents[ i] ;
      list = new File( module.getPath() + File.separator + listFile) ;
      if( list.exists()) {
	modules.add( module) ;
      }
    }
    return( modules) ;
  }

  protected String antBaseDir() {
    return( getProject().getBaseDir().getAbsolutePath() + File.separator) ;
  }

}