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	Does not allow overwriting existing file when uploading.
	User instead receives this message:
	Unable to upload $filename, a file by that name was found in $path
	To upload, rename or delete existing $filename in $path.

# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or 
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#

package Apache::portfolio;
use strict;
use Apache::Constants qw(:common :http);
use Apache::loncommon;
use Apache::lonnet;
use Apache::lontexconvert;
use Apache::lonfeedback;
use Apache::lonlocal;

# receives a file name and path stub from username/userfiles/portfolio/
# returns an anchor tag consisting encoding filename and currentpath
sub make_anchor {
    my ($filename, $current_path) = @_;
    my $anchor = '<a href="/adm/portfolio?selectfile='.$filename.'&currentpath='.$current_path.'">'.$filename.'</a>';
    return $anchor;
}

# returns html with <br /> separated contents of the directory
# returns a <strong>currentFile</strong> (bolds the selected file/dir)
sub display_directory_old {
    my ($currentPath, $currentFile, @dirList,) = @_;
    my $displayOut='';  
    my $filename;
    my $upPath;
    if ($currentPath ne '/') {
        $displayOut = 'Listing of '.$currentPath.'<br /><hr />';
        # provides the "up one directory level" function
        # it means shortening the currentpath to the parent directory
        $currentPath =~ m:(^/.*)(/.*/$):;
        if ($1 ne '/') {
            $upPath = $1.'/';
        } else {
            $upPath = $1;
        }
        
        # $displayOut = $displayOut.'<a href="/adm/portfolio?selectfile='.$upPath.'&currentpath='.$upPath.'">..</a><br />';
    } else {
        # $displayOut = $displayOut.'at root '.$currentPath.'<br />';
    }
    foreach my $line (@dirList) {
    	#$strip holds directory/file name
    	#$dom 
    	my ($filename,$dom,undef,$testdir,undef,undef,undef,undef,undef,undef,undef,undef,undef,undef,$obs,undef)=split(/\&/,$line,16); 
        if (($filename ne '.') && ($filename ne '..')) {
            if ($testdir =~ m:^1:) {
                # handle directories different from files
                if ($filename eq $currentFile) {
		    #checks to bold the selected file
                    $displayOut.= '<strong>'.(&make_anchor($filename.'/', $filename.'/').'</strong><br />'."\n");
                } else {
                    $displayOut.= (&make_anchor($filename.'/', $filename.'/').'<br />'."\n");
                }
            } else {
                if ($filename eq $currentFile) {
		    #checks to bold the selected file
                    $displayOut.='<strong>'.(&make_anchor($filename, $currentPath).'</strong><br />'."\n");
                } else {
                    $displayOut.=(&make_anchor($filename, $currentPath).'<br />'."\n");
                }
            }
            
        }
    	
    }
    return $displayOut;
}

sub displayActions {
    # returns html to offer user appropriate actions depending on selected file/directory
    my $displayOut;
    my ($currentPath, $currentFile, $isEmpty) = @_;
#   $displayOut = 'here are actions for '.$currentFile;
    if ($currentFile =~ m:/$:) {
        # if the selected file is a directory, these are the options
        # offer the chance to delete the directory only if it is empty
        if ($isEmpty && ($currentPath ne '/')) {
            $displayOut =   $displayOut.'<form method="POST">
            <input type="hidden" name="selectfile" 
            value="'.$currentFile.'" />
            <input type="hidden" name="fileaction" value="delete" /> 
            <input type="hidden" name="currentpath" value="'.$currentPath.'" /> 
            <center>
            <input type="submit" 
            value="Delete '.$currentFile.'" />
            </center>
            </form>';
        } 
        if ($currentPath ne '/') {
            $displayOut = $displayOut.'<hr />
            <form method="POST">
            <input type="hidden" name="selectfile" 
            value="'.$currentFile.'" />
            <input type="hidden" name="fileaction" value="rename" /> 
            <input type="hidden" name="currentpath" value="'.$currentPath.'" /> 
            <input type="input" name="filenewname" value="Type new name here" /> 
            <input type="submit" 
            value="Rename '.$currentFile.'" />
            </form>';
        }
    } else {  #action options offered for files
        $displayOut = $displayOut.'<form method="POST">';
        $displayOut = $displayOut.'<input type="hidden" name="selectfile"';
        $displayOut = $displayOut.'value="'.$currentFile;
        $displayOut = $displayOut.'" /><input type="hidden" name="fileaction" value="delete" /> 
        <input type="hidden" name="currentpath" value="'.$currentPath.'" /> 
        <center>
        <input type="submit"
        value="Delete '.$currentFile.'" />
        </center>
        </form>';
    
        $displayOut = $displayOut.'<hr />
        <form method="POST">
        <input type="hidden" name="selectfile" 
        value="'.$currentFile.'" />
        <input type="hidden" name="fileaction" value="rename" /> 
        <input type="hidden" name="currentpath" value="'.$currentPath.'" /> 
        <input type="input" name="filenewname" value="Type new name here" /> 
        <input type="submit" 
        value="Rename '.$currentFile.'" />
        </form>
        <hr />';
    }
    $displayOut = $displayOut.'<hr />Add a file to '.$currentPath;
    # file upload form 
    $displayOut = $displayOut.'<form method="post" enctype="multipart/form-data">';
    $displayOut = $displayOut.'<input name="uploaddoc" type="file" />'.
        '<input type="hidden" name="currentpath" value="'.$currentPath.'" />'.
        '<input type="submit" name="storeupl" value="Upload" />'.
        '</form><hr />';
    $displayOut = $displayOut.'<form method="POST">
        <input name="subdir" type="text" />
        <input type="submit" value="Create Subdirectory" />
        </form>
            ';
    return $displayOut;
}

my $dirptr=16384;
sub display_directory {
    my ($r,$current_path,$is_empty,$dir_list)=@_;
    my $iconpath= $r->dir_config('lonIconsURL') . "/";
    $r->print('<table border="0" cellspacing="2" cellpadding="2"><tr valign="middle">');
    $r->print('<td bgcolor="#ccddaa" align="center">');
    my $displayOut = '<form method="post" enctype="multipart/form-data">';
    $displayOut = $displayOut.'<input name="uploaddoc" type="file" />'.
        '<input type="hidden" name="currentpath" value="'.$current_path.'" />'.
        '<input type="submit" name="storeupl" value="Upload" />'.
        '</form>';
    $r->print($displayOut);
    $r->print('</td></tr><tr><td bgcolor="#ccddaa" align="center">');
    $displayOut = '<form method="post">';
    $displayOut .= '<input name="newdir" type="input" />'.
        '<input type="hidden" name="currentpath" value="'.$current_path.'" />'.
        '<input type="submit" name="createdir" value="'.&mt("Create Directory").'" />'.
        '</form>';
    $r->print($displayOut);
    $r->print('</td></tr></table>');
    my @tree = split (/\//,$current_path);
    $r->print('<font size="+2">'.&make_anchor('portfolio','/').'/');
    if (@tree > 1){
        my $newCurrentPath = '';
        for (my $i = 1; $i< @tree; $i++){
            $newCurrentPath .= $tree[$i].'/';
            $r->print(&make_anchor($tree[$i],'/'.$newCurrentPath).'/');
        }
    }
    $r->print('</font>');
    &Apache::lonhtmlcommon::store_recent('portfolio',$current_path,$current_path);
    $r->print('<br /><form method=post action="/adm/portfolio">'.
	      &Apache::lonhtmlcommon::select_recent('portfolio','currentpath',
						    'this.form.submit();'));
    $r->print("</form>");
    if ($is_empty) {
        $displayOut = '<form method="post" action="/adm/portfolio">'.
        '<input type="hidden" name="action" value="deletedir" />'.
        '<input type="submit" name="deletedir" value="'.&mt("Delete Directory").'" />'.
        '<input type="hidden" name="selectfile" value="" />'.
        '<input type="hidden" name="currentpath" value="'.$current_path.'" />'.
        '</form>';
        
        $r->print($displayOut);
	return;
    }
    $r->print('<table border="0" cellspacing="2" cellpadding="2">'.
            '<tr><th>Actions</th><th>&nbsp;</th><th>Name</th><th>Size</th><th>Last Modified</th></tr>');
    my $href_location="/uploaded/$ENV{'user.domain'}/$ENV{'user.name'}/portfolio/$current_path/";
    foreach my $line (sort 
		      { 
			  my ($afile)=split('&',$a,2);
			  my ($bfile)=split('&',$b,2);
			  return (lc($afile) cmp lc($bfile));
		      } (@$dir_list)) {
    	#$strip holds directory/file name
    	#$dom 
    	my ($filename,$dom,undef,$testdir,undef,undef,undef,undef,$size,undef,$mtime,undef,undef,undef,$obs,undef)=split(/\&/,$line,16); 
    	if (($filename ne '.') && ($filename ne '..')) {
            if ($dirptr&$testdir) {
                $r->print('<tr bgcolor="#FFAA99"><td><img src="'.$iconpath.'folder_closed.gif"></td>');
                $r->print('<td>Go to ...</td>');
                $r->print('<td>'.&make_anchor($filename.'/',$current_path.$filename.'/').'</td>'); 
                $r->print('</tr>'); 
            } else {
                $r->print('<tr bgcolor="#CCCCFF">');
                $r->print('<td>
<form method="post" action="/adm/portfolio">
<select name="action">
  <option value=""></option>
  <option value="delete">'.&mt("Delete").'</option>
  <option value="rename">'.&mt("Rename").'</option>
</select>
<input type="submit" name="doit" value="Go" />
<input type="hidden" name="selectfile" value="'.$filename.'" />
<input type="hidden" name="currentpath" value="'.$current_path.'" />
</form>
</td>');
                $r->print('<td><img src="'.$iconpath.'unknown.gif"></td>');
                $r->print('<td><a href="'.$href_location.$filename.'">'.
			  $filename.'</a></td>'); 
                $r->print('<td>'.$size.'</td>');
                $r->print('<td>'.&Apache::lonlocal::locallocaltime($mtime).'</td>');
                $r->print('</tr>'); 
            }
        }
    }
#   <tr bgcolor="#FFAA99"> pink bg 
#   <tr bgcolor="#CCCCFF"> blue bg            
#   $r->print(&display_directory($current_path, $currentFile, @dir_list));
#    $r->print('</td>><td>');
#   $r->print(&display_actions($current_path, $currentFile, $isEmpty));
    $r->print('</table></form>');
}

sub open_form {
    my ($r)=@_;
    $r->print('<form method="post" action="/adm/portfolio">');
    $r->print('<input type="hidden" name="action" value="'.
	      $ENV{'form.action'}.'" />');
    $r->print('<input type="hidden" name="confirmed" value="1" />');
    $r->print('<input type="hidden" name="selectfile" value="'.
	      $ENV{'form.selectfile'}.'" />');
    $r->print('<input type="hidden" name="currentpath" value="'.
	      $ENV{'form.currentpath'}.'" />');
}

sub clean_filename {
    my ($fname)=@_;
# Replace Windows backslashes by forward slashes
    $fname=~s/\\/\//g;
# Get rid of everything but the actual filename
    $fname=~s/^.*\/([^\/]+)$/$1/;
# Replace spaces by underscores
    $fname=~s/\s+/\_/g;
# Replace all other weird characters by nothing
    $fname=~s/[^\w\.\-]//g;
    return $fname;
}

sub close_form {
    my ($r)=@_;
    $r->print('<p><input type="submit" value="'.&mt('Continue').
	      '" /></p></form>');
    $r->print('<form action="/adm/portfolio" method="POST">
               <p>
              <input type="hidden" name="currentpath" value="'.
	      $ENV{'form.currentpath'}.'" />
                 <input type="submit" value="'.&mt('Cancel').'" />
               </p></form>');

}

sub display_file {
    my ($path,$filename)=@_;
    if (!defined($path)) { $path=$ENV{'form.currentpath'}; }
    if (!defined($filename)) { $filename=$ENV{'form.selectfile'}; }
    return '<tt>'.$path.$filename.'</tt>';
}

sub done {
    return ('<h3><a href="/adm/portfolio?currentpath='.
	    $ENV{'form.currentpath'}.'">'.&mt('Done').'</a></h3>');
}

sub delete {
    my ($r)=@_;
    &open_form($r);
    $r->print('<p>'.&mt('Delete').' '.&display_file().'?</p>');
    &close_form($r);
} 

sub delete_confirmed {
    my ($r)=@_;
    my $result=&Apache::lonnet::removeuserfile($ENV{'user.name'},
					       $ENV{'user.domain'},'portfolio'.
					       $ENV{'form.currentpath'}.
					       $ENV{'form.selectfile'});
    if ($result ne 'ok') {
	$r->print('<font color="red"> An error occured ('.$result.
		  ') while trying to delete '.&display_file().'</font><br />');
    }
    $r->print(&done());
}

sub delete_dir {
    my ($r)=@_;
    &open_form($r);
    $r->print('<p>'.&mt('Delete').' '.&display_file().'?</p>');
    &close_form($r);
} 

sub delete_dir_confirmed {
    my ($r)=@_;
    my $directory_name = $ENV{'form.currentpath'};
    $directory_name =~ m/\/$/;
    $directory_name = $`;
    my $result=&Apache::lonnet::removeuserfile($ENV{'user.name'},
					       $ENV{'user.domain'},'portfolio'.
					       $directory_name);
					       
    if ($result ne 'ok') {
	$r->print('<font color="red"> An error occured (dir) ('.$result.
		  ') while trying to delete '.$directory_name.'</font><br />');
    } else {
        my @dirs = split m!/!, $directory_name;
        
#        $directory_name =~ m/^(\/*\/)(\/*.)$/;
        $directory_name='/';
        for (my $i=1; $i < (@dirs - 1); $i ++){
            $directory_name .= $dirs[$i].'/';
        }
        $ENV{'form.currentpath'} = $directory_name;
    }
    $r->print(&done());
}

sub rename {
    my ($r)=@_;
    &open_form($r);
    $r->print('<p>'.&mt('Rename').' '.&display_file().' to 
               <input name="filenewname" type="input" size="50" />?</p>');
    &close_form($r);
}

sub rename_confirmed {
    my ($r)=@_;
    my $filenewname=&Apache::lonnet::clean_filename($ENV{'form.filenewname'});
    if ($filenewname eq '') {
	$r->print('<font color="red">'.
		  &mt("Error: no valid filename was provided to rename to.").
		  '</font><br />');
	$r->print(&done());
	return;
    } 
    my $result=
	&Apache::lonnet::renameuserfile($ENV{'user.name'},$ENV{'user.domain'},
            'portfolio'.$ENV{'form.currentpath'}.$ENV{'form.selectfile'},
            'portfolio'.$ENV{'form.currentpath'}.$ENV{'form.filenewname'});
    if ($result ne 'ok') {
	$r->print('<font color="red"> An errror occured ('.$result.
		  ') while trying to rename '.&display_file().' to '.
		  &display_file(undef,$filenewname).'</font><br />');
    }
    $r->print(&done());
}

sub upload {
    my ($r)=@_;
    #FIXME if the file already exists we need to do a confirmation pass 
    #before overwriting
    my $fname=$ENV{'form.uploaddoc.filename'};
    $fname=&clean_filename($fname);
   	my $portfolio_root = &Apache::loncommon::propath($ENV{'user.domain'},
						 $ENV{'user.name'}).
						'/userfiles/portfolio';
	my @dir_list=&Apache::lonnet::dirlist($ENV{'form.currentpath'},
					    $ENV{'user.domain'},
					    $ENV{'user.name'},$portfolio_root);
  	my $found_file = 0;
    foreach my $line (@dir_list) {
    	#$strip holds directory/file name
    	#$dom 
    	my ($filename,$dom,undef,$testdir,undef,undef,undef,undef,undef,undef,undef,undef,undef,undef,$obs,undef)=split(/\&/,$line,16); 
        if ($filename eq $fname){
            $found_file = 1;
        }
    }
    if ($found_file){   
        $r->print('<font color="red">Unable to upload <strong>'.$fname.'</strong>, a file by that name was found in <strong>'.$ENV{'form.currentpath'}.'</strong></font>'.
                  '<br />To upload, rename or delete existing '.$fname.' in '.$ENV{'form.currentpath'});
    } else {
        my $result=&Apache::lonnet::userfileupload('uploaddoc','',
	        	 'portfolio'.$ENV{'form.currentpath'});
        if ($result !~ m|^/uploaded/|) {
        	$r->print('<font color="red"> An errror occured ('.$result.
		              ') while trying to upload '.&display_file().'</font><br />');
        }
    }
    $r->print(&done());
}

sub createdir {
    my ($r)=@_;
    #FIXME 1) file exists in place of dir (errormessage needs improvement)
    my $newdir=&Apache::lonnet::clean_filename($ENV{'form.newdir'});
    if ($newdir eq '') {
	$r->print('<font color="red">'.
		  &mt("Error: no valid directory name was provided.").
		  '</font><br />');
	$r->print(&done());
	return;
    } 
    my $result=&Apache::lonnet::mkdiruserfile($ENV{'user.name'},
	     $ENV{'user.domain'},'portfolio'.$ENV{'form.currentpath'}.$newdir);
    if ($result ne 'ok') {
	$r->print('<font color="red"> An errror occured ('.$result.
		  ') while trying to create a new directory '.&display_file().'</font><br />');
    }
    $r->print(&done());
}

sub handler {
    # this handles file management
    my $r = shift;
	my $portfolio_root = &Apache::loncommon::propath($ENV{'user.domain'},
							 $ENV{'user.name'}).
							'/userfiles/portfolio';
    &Apache::loncommon::no_cache($r);
    &Apache::loncommon::content_type($r,'text/html');
    $r->send_http_header;
    # Give the LON-CAPA page header
    $r->print('<html><head><title>'.
              &mt('Portfolio Manager').
              "</title></head>\n".
              &Apache::loncommon::bodytag('Portfolio Manager'));
    $r->rflush();
    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
                                            ['selectfile','currentpath',
					     'currentfile']);

    if ($ENV{'form.uploaddoc.filename'}) {
	&upload($r);
    } elsif ($ENV{'form.action'} eq 'delete' && $ENV{'form.confirmed'}) {
	&delete_confirmed($r);
    } elsif ($ENV{'form.action'} eq 'delete') {
	&delete($r);
    } elsif ($ENV{'form.action'} eq 'deletedir' && $ENV{'form.confirmed'}) {
	&delete_dir_confirmed($r);
    } elsif ($ENV{'form.action'} eq 'deletedir'){
	&delete_dir($r);
    } elsif ($ENV{'form.action'} eq 'rename' && $ENV{'form.confirmed'}) {
	&rename_confirmed($r);
    } elsif ($ENV{'form.action'} eq 'rename') {
	&rename($r);
    } elsif ($ENV{'form.createdir'}) {
	&createdir($r);
    } else {
	my $current_path='/';
	if ($ENV{'form.currentpath'}) {
	    $current_path = $ENV{'form.currentpath'};
	}
	my @dir_list=&Apache::lonnet::dirlist($current_path,
					    $ENV{'user.domain'},
					    $ENV{'user.name'},$portfolio_root);
    
	# need to know if directory is empty so it can be removed if desired
	my $is_empty=(@dir_list == 2);
	&display_directory($r,$current_path,$is_empty,\@dir_list);
	$r->print("</body>\n</html>\n");
	return OK;
    }
}
1;
__END__