# 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 makeAnchor{
    my ($fileName, $currentPath) = @_;
    my $anchor = '<a href="/adm/portfolio?selectfile='.$fileName.'&currentpath='.$currentPath.'">'.$fileName.'</a>';
    return $anchor;
}

# returns html with <br /> separated contents of the directory
# returns a <strong>currentFile</strong> (bolds the selected file/dir)
sub displayDirectory {
    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,$obs,undef,$path,$debug)=split(/\&/,$line,18); 
    	$path =~ m:/:;
    	my $dirDepth = @-;
        if (($fileName ne '.') && ($fileName ne '..')){
          	for (my $i = 0; $i <= $dirDepth; $i += 1){
    	        $displayOut.='<blockquote>';
    	    }
            if ($testdir =~ m:^1:){
                # handle directories different from files
                if ($fileName eq $currentFile){ #checks to bold the selected file
                    $displayOut.= $debug.'<strong>'.(makeAnchor($fileName.'/', $path.$fileName.'/').'</strong><br />'."\n");
                }else{
                    $displayOut.= $debug.(makeAnchor($fileName.'/', $path.$fileName.'/').'<br />'."\n");
                }
            }else{
                if ($fileName eq $currentFile){ #checks to bold the selected file
                    $displayOut.=$debug.'<strong>'.(makeAnchor($fileName, $currentPath).'</strong><br />'."\n");
                }else{
                    $displayOut.=$debug.(makeAnchor($fileName, $currentPath).'<br />'."\n");
                }
            }
        	for (my $i = 0; $i <= $dirDepth; $i += 1){
        	    $displayOut.='</blockquote>';
    	    }
            
        }
    	
    }
    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;
}
sub handler {
    # this handles file management
    my $r = shift;
    my @dirList; # will hold directory listing as array
    my $udir; # returned from home server
    my $currentPath; # path assuming /userfiles/portfolio/ as root
    my $currentFile; # directory or file contained in $pathToRoot.$currentPath
    my $action; # delete, rename, makedirectory, removedirectory,
    my $filenewname; # for rename action (guess what we do with it!)
    my $isFile;
    my $isEmpty;
    &Apache::loncommon::no_cache($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']);
    # currentPath and currentFile need to be set for the rest of things to happen
    # sometimes, currentFile will be passed by a form field, selectedfile
    # if there is no 'form.selectedfile' then the current directory is 
    # considered as selected 
    if ($ENV{'form.currentpath'}) {
        $currentPath = $ENV{'form.currentpath'};
    } else {
        $currentPath = '/';
    }
    if ($ENV{'form.selectfile'}) {
        # have to check if the selected file is a subdirectory
        if ($ENV{'form.selectfile'} =~ /-\(Dir\)/){
            # $currentPath =~ /\-\(Dir\)/;
            $currentPath = $`.'/';
            $r->print('<br />'.$currentPath.'<br />');
        }
        $currentFile = $ENV{'form.selectfile'};
    } else {
        $currentFile = '';
    }
    # if we're uploading a file, we need to do it early so it will show in the directory list
    if ($ENV{'form.uploaddoc.filename'}) {
        $r->print($ENV{'form.storeupl'}.'<br />');
        $r->print(&Apache::lonnet::userfileupload('uploaddoc','','portfolio'.$currentPath).'<br />');  
    }
    # similarly, we need to delete or rename files before getting directory list
    if ($ENV{'form.selectfile'}){
        if ($ENV{'form.fileaction'} eq 'delete') {
            $r->print('<br />trying to delete '.$currentPath.$ENV{'form.selectfile'}.'<br />');
            $r->print(&Apache::lonnet::removeuserfile($ENV{'user.name'}, $ENV{'user.domain'},'portfolio'.$currentPath.$ENV{'form.selectfile'}));
            $currentFile = '';
        } elsif ($ENV{'form.fileaction'} eq 'rename') {
            &Apache::lonnet::portfoliomanage($currentPath.$ENV{'form.selectfile'}, 'rename', $currentPath.$ENV{'form.filenewname'} );
        }
    }
    # we always need $dirList, plus this will return information about the current file
    # as well as information about he home server directory structure, specifically
    # the path to the users userfiles directory.    
    # 
    my $portfolio_root = &Apache::loncommon::propath($ENV{'user.domain'},
						     $ENV{'user.name'}).
						       '/userfiles/portfolio';
    my $done = 0;
    my $subdir = '';
    my @workinglist; # intermediate array, holds directory listing lines (dirlist), and path information
    my $readDirectory = 1; # flag for directory
    my $loopCounter = 0; # needed only for development to prevent run away program (or maybe more?)
    while (!$done){
        # Needed while developing. Later, too?
        $loopCounter += 1;
        if ($loopCounter > 50) {
            $r->print('<br />stop runaway');
            return OK;
        }
        # ---
        if ($readDirectory){ # is true the first time through, then true if dirlist line is a subdir
            # $r->print('<br />reading '.$portfolio_root.$subdir);
            my @list = &Apache::lonnet::dirlist($currentPath,  $ENV{'user.domain'}, $ENV{'user.name'}, $portfolio_root.$subdir);
            $r->print('value in @list = '.@list);
            for (my $i = 0; $i <= @list; $i++ ){
                my $line = pop @list;
                $line = $line.'&'.$subdir.'&'.$loopCounter; # append the subdirectory information and loopcounter for debug
                my ($fileName,$dom,undef,$testdir,undef,undef,undef,undef,undef,undef,undef,undef,undef,undef,$obs,undef,$subpath)=split(/\&/,$line,17); 
                if (($fileName ne '.') && ($fileName ne '..')){ # we throw away the current and parent directories
                    $r->print('<br />'.$line); #for debugging
                    unshift @workinglist, $line; # add the line to the working list array
                    
                }else{
                    $r->print('<br /> parent or current '.$line); #for debugging
                }
            }
        }
        $r->print('<br />'.@workinglist.' lines in workinglist');
        my $line = shift @workinglist; #take one off the working list
        $r->print('<br />'.@workinglist.' lines in workinglist');
        if ($line eq '') { # if the working list is empty
            $done = 1;
        }else{
            my ($fileName,$dom,undef,$testdir,undef,undef,undef,undef,undef,undef,undef,undef,undef,undef,$obs,undef,$subpath,$debug)=split(/\&/,$line,18); 
            $r->print('<br />'.$fileName.' is '.$testdir);
            push @dirList, $line; # and put it in the display list
            if ($testdir =~ m:^1:) { # true if this is a directory
                # $r->print('<br />added subdir '.$fileName);
                $subdir = $subpath.'/'.$fileName; 
                $readDirectory = 1;
            }else{
                $readDirectory = 0;
            }
        }
    }
    #	if item is directory {  get the next level down
    #		my @list = &Apache::lonnet::dirlist($currentPath,  $ENV{'user.domain'}, $ENV{'user.name'}, $portfolio_root.$);
    
    if (@dirList == 2) { # need to know if directory is empty so it can be removed if desired
        $isEmpty = 1;
    } else {
        $isEmpty = 0;
    }
   
    if ($ENV{'form.selectfile'}) {
        if ($ENV{'form.fileaction'} eq 'delete') {
            &Apache::lonnet::portfoliomanage($ENV{'form.selectfile'}, 'delete', undef );
            $ENV{'portfolio.file'} = 'Selected File Deleted';
        } elsif ($ENV{'form.fileaction'} eq 'rename') {
            &Apache::lonnet::portfoliomanage($ENV{'form.selectfile'}, 'rename', $ENV{'form.filenewname'});
        } else {
        # Remember user's file selection for later
        $ENV{'portfolio.file'} = $ENV{'form.selectfile'};
        # offer things user can do with selected file
        }
    }else{
        unless ($ENV{'portfolio.file'}){
            $ENV{'portfolio.file'} = 'No File Selected';
        }
    }
    ##############################
    #
    # Display begins here
    #
    ##############################
    $r->print('<table border=1><tr><td>');
    $r->print(displayDirectory($currentPath, $currentFile, @dirList));
    $r->print('</td>><td>');
    $r->print(displayActions($currentPath, $currentFile, $isEmpty));
    $r->print('</td>></tr></table>');
    $r->print('</blockquote>');
    $r->print("</body>\n</html>\n");
    $r->rflush();
    return OK;
}

1;
__END__