/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2000 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written 
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package org.apache.tools.ant.taskdefs;

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

/**
 * Deletes a file or directory, or set of files defined by a fileset.
 * The original delete task would delete a file, or a set of files 
 * using the include/exclude syntax.  The deltree task would delete a 
 * directory tree.  This task combines the functionality of these two
 * originally distinct tasks.
 * <p>Currently Delete extends MatchingTask.  This is intend <i>only</i>
 * to provide backwards compatibility for a release.  The future position
 * is to use nested filesets exclusively.</p>
 * 
 * @author Stefano Mazzocchi <a href="mailto:stefano@apache.org">stefano@apache.org</a>
 * @author Tom Dimock <a href="mailto:tad1@cornell.edu">tad1@cornell.edu</a>
 * @author Glenn McAllister <a href="mailto:glennm@ca.ibm.com">glennm@ca.ibm.com</a>
 * @author Jon S. Stevens <a href="mailto:jon@latchkey.com">jon@latchkey.com</a>
 */
public class Delete extends MatchingTask {
    protected File file = null;
    protected File dir = null;
    protected Vector filesets = new Vector();
    protected boolean usedMatchingTask = false;
    protected boolean includeEmpty = false;     // by default, remove matching empty dirs

    private int verbosity = Project.MSG_VERBOSE;
    private boolean quiet = false;
    private boolean failonerror = true;

    /**
     * Set the name of a single file to be removed.
     *
     * @param file the file to be deleted
     */
    public void setFile(File file) {
        this.file = file;
    }

    /**
     * Set the directory from which files are to be deleted
     *
     * @param dir the directory path.
     */
    public void setDir(File dir) {
        this.dir = dir;
    }

    /**
     * Used to force listing of all names of deleted files.
     *
     * @param verbose "true" or "on"
     */
    public void setVerbose(boolean verbose) {
        if (verbose) {
            this.verbosity = Project.MSG_INFO;
        } else {
            this.verbosity = Project.MSG_VERBOSE;
        }
    }

    /**
     * If the file does not exist, do not display a diagnostic
     * message or modify the exit status to reflect an error.
     * This means that if a file or directory cannot be deleted,
     * then no error is reported. This setting emulates the
     * -f option to the Unix &quot;rm&quot; command.
     * Default is false meaning things are &quot;noisy&quot;
     * @param quiet "true" or "on"
     */
    public void setQuiet(boolean quiet) {
        this.quiet = quiet;
        if (quiet) {
            this.failonerror = false;
        }
    }

    /**
     * this flag means 'note errors to the output, but keep going'
     * @param failonerror true or false
     */
     public void setFailOnError(boolean failonerror) {
         this.failonerror=failonerror;
     }


    /**
     * Used to delete empty directories.
     */
    public void setIncludeEmptyDirs(boolean includeEmpty) {
        this.includeEmpty = includeEmpty;
    }

   /**
     * Adds a set of files (nested fileset attribute).
     */
    public void addFileset(FileSet set) {
        filesets.addElement(set);
    }

    /**
     * add a name entry on the include list
     */
    public PatternSet.NameEntry createInclude() {
        usedMatchingTask = true;
        return super.createInclude();
    }

    /**
     * add a name entry on the exclude list
     */
    public PatternSet.NameEntry createExclude() {
        usedMatchingTask = true;
        return super.createExclude();
    }

    /**
     * add a set of patterns
     */
    public PatternSet createPatternSet() {
        usedMatchingTask = true;
        return super.createPatternSet();
    }

    /**
     * Sets the set of include patterns. Patterns may be separated by a comma
     * or a space.
     *
     * @param includes the string containing the include patterns
     */
    public void setIncludes(String includes) {
        usedMatchingTask = true;
        super.setIncludes(includes);
    }

    /**
     * Sets the set of exclude patterns. Patterns may be separated by a comma
     * or a space.
     *
     * @param excludes the string containing the exclude patterns
     */
    public void setExcludes(String excludes) {
        usedMatchingTask = true;
        super.setExcludes(excludes);
    }

    /**
     * Sets whether default exclusions should be used or not.
     *
     * @param useDefaultExcludes "true"|"on"|"yes" when default exclusions
     *                           should be used, "false"|"off"|"no" when they
     *                           shouldn't be used.
     */
    public void setDefaultexcludes(boolean useDefaultExcludes) {
        usedMatchingTask = true;
        super.setDefaultexcludes(useDefaultExcludes);
    }

    /**
     * Sets the name of the file containing the includes patterns.
     *
     * @param includesfile A string containing the filename to fetch
     * the include patterns from.
     */
    public void setIncludesfile(File includesfile) {
        usedMatchingTask = true;
        super.setIncludesfile(includesfile);
    }

    /**
     * Sets the name of the file containing the includes patterns.
     *
     * @param excludesfile A string containing the filename to fetch
     * the include patterns from.
     */
    public void setExcludesfile(File excludesfile) {
        usedMatchingTask = true;
        super.setExcludesfile(excludesfile);
    }

    /**
     * Delete the file(s).
     */
    public void execute() throws BuildException {
        if (usedMatchingTask) {
            log("DEPRECATED - Use of the implicit FileSet is deprecated.  Use a nested fileset element instead.");
        }

        if (file == null && dir == null && filesets.size() == 0) {
            throw new BuildException("At least one of the file or dir attributes, or a fileset element, must be set.");
        }

        if (quiet && failonerror) {
            throw new BuildException("quiet and failonerror cannot both be set to true",
                                     location);
        }
        

        // delete the single file
        if (file != null) {
            if (file.exists()) {
                if (file.isDirectory()) {
                    log("Directory " + file.getAbsolutePath() + " cannot be removed using the file attribute.  Use dir instead.");
                } else {
                    log("Deleting: " + file.getAbsolutePath());

                    if (!file.delete()) {
                        String message="Unable to delete file " + file.getAbsolutePath();
                        if(failonerror)
                            throw new BuildException(message);
                        else 
                            log(message, 
                                quiet ? Project.MSG_VERBOSE : Project.MSG_WARN);
                    }
                }
            } else {
                log("Could not find file " + file.getAbsolutePath() + " to delete.", 
                    Project.MSG_VERBOSE);
            }
        }

        // delete the directory
        if (dir != null && dir.exists() && dir.isDirectory() && !usedMatchingTask) {
            /*
               If verbosity is MSG_VERBOSE, that mean we are doing regular logging
               (backwards as that sounds).  In that case, we want to print one
               message about deleting the top of the directory tree.  Otherwise,
               the removeDir method will handle messages for _all_ directories.
             */
            if (verbosity == Project.MSG_VERBOSE) {
                log("Deleting directory " + dir.getAbsolutePath());
            }
            removeDir(dir);
        }

        // delete the files in the filesets
        for (int i=0; i<filesets.size(); i++) {
            FileSet fs = (FileSet) filesets.elementAt(i);
            try {
                DirectoryScanner ds = fs.getDirectoryScanner(project);
                String[] files = ds.getIncludedFiles();
                String[] dirs = ds.getIncludedDirectories();
                removeFiles(fs.getDir(project), files, dirs);
            } catch (BuildException be) {
                // directory doesn't exist or is not readable
                if (failonerror) {
                    throw be;
                } else {
                    log(be.getMessage(), 
                        quiet ? Project.MSG_VERBOSE : Project.MSG_WARN);
                }
            }
        }

        // delete the files from the default fileset
        if (usedMatchingTask && dir != null) {
            try {
                DirectoryScanner ds = super.getDirectoryScanner(dir);
                String[] files = ds.getIncludedFiles();
                String[] dirs = ds.getIncludedDirectories();
                removeFiles(dir, files, dirs);
            } catch (BuildException be) {
                // directory doesn't exist or is not readable
                if (failonerror) {
                    throw be;
                } else {
                    log(be.getMessage(), 
                        quiet ? Project.MSG_VERBOSE : Project.MSG_WARN);
                }
            }
        }
    }

//************************************************************************
//  protected and private methods
//************************************************************************

    protected void removeDir(File d) {
        String[] list = d.list();
        if (list == null) list = new String[0];
        for (int i = 0; i < list.length; i++) {
            String s = list[i];
            File f = new File(d, s);
            if (f.isDirectory()) {
                removeDir(f);
            } else {
                log("Deleting " + f.getAbsolutePath(), verbosity);
                if (!f.delete()) {
                    String message="Unable to delete file " + f.getAbsolutePath();
                    if(failonerror)
                        throw new BuildException(message);
                    else
                        log(message,
                            quiet ? Project.MSG_VERBOSE : Project.MSG_WARN);
                }
            }
        }
        log("Deleting directory " + d.getAbsolutePath(), verbosity);
        if (!d.delete()) {
            String message="Unable to delete directory " + dir.getAbsolutePath();
            if(failonerror)
                throw new BuildException(message);
            else
                log(message,
                    quiet ? Project.MSG_VERBOSE : Project.MSG_WARN);
        }
    }

    /**
     * remove an array of files in a directory, and a list of subdirectories
     * which will only be deleted if 'includeEmpty' is true
     * @param d directory to work from
     * @param files array of files to delete; can be of zero length
     * @param dirs array of directories to delete; can of zero length
     */
    protected void removeFiles(File d, String[] files, String[] dirs) {
        if (files.length > 0) {
            log("Deleting " + files.length + " files from " + d.getAbsolutePath());
            for (int j=0; j<files.length; j++) {
                File f = new File(d, files[j]);
                log("Deleting " + f.getAbsolutePath(), verbosity);
                if (!f.delete()) {
                    String message="Unable to delete file " + f.getAbsolutePath();
                    if(failonerror)
                        throw new BuildException(message);
                    else
                        log(message,
                            quiet ? Project.MSG_VERBOSE : Project.MSG_WARN);
                }
            }
        }

        if (dirs.length > 0 && includeEmpty) {
            int dirCount = 0;
            for (int j=dirs.length-1; j>=0; j--) {
                File dir = new File(d, dirs[j]);
                String[] dirFiles = dir.list();
                if (dirFiles == null || dirFiles.length == 0) {
                    log("Deleting " + dir.getAbsolutePath(), verbosity);
                    if (!dir.delete()) {
                        String message="Unable to delete directory "
                                + dir.getAbsolutePath();
                        if(failonerror)
                            throw new BuildException(message);
                        else
                            log(message,
                                quiet ? Project.MSG_VERBOSE : Project.MSG_WARN);
                    } else {
                        dirCount++;
                    }
                }
            }

            if (dirCount > 0) {
                log("Deleted " + dirCount + " director" +
                    (dirCount==1 ? "y" : "ies") +
                    " from " + d.getAbsolutePath());
            }
        }
    }
}