################################################################################
# WeBWorK Online Homework Delivery System
# Copyright © 2000-2007 The WeBWorK Project, http://openwebwork.sf.net/
# $CVSHeader: webwork2/lib/WeBWorK/ContentGenerator/Instructor/SetMaker.pm,v 1.85 2008/07/01 13:18:52 glarose Exp $
# 
# This program is free software; you can redistribute it and/or modify it under
# the terms of either: (a) the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any later
# version, or (b) the "Artistic License" which comes with this package.
# 
# This program 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 either the GNU General Public License or the
# Artistic License for more details.
################################################################################


package WeBWorK::ContentGenerator::Instructor::SetMaker2;
use base qw(WeBWorK::ContentGenerator::Instructor);

=head1 NAME

WeBWorK::ContentGenerator::Instructor::SetMaker2 - Make homework sets.

=cut

use strict;
use warnings;


#use CGI qw(-nosticky);
use WeBWorK::CGI;
use WeBWorK::Debug;
use WeBWorK::Form;
use WeBWorK::Utils qw(readDirectory max sortByName);
use WeBWorK::Utils::Tasks qw(renderProblems);
use File::Find;

require WeBWorK::Utils::ListingDB;

use constant SHOW_HINTS_DEFAULT => 0;
use constant SHOW_SOLUTIONS_DEFAULT => 0;
use constant MAX_SHOW_DEFAULT => 20;
use constant NO_LOCAL_SET_STRING => 'No sets in this course yet';
use constant SELECT_SET_STRING => 'Select a Set from this Course';
use constant SELECT_LOCAL_STRING => 'Select a Problem Collection';
use constant MY_PROBLEMS => '  My Problems  ';
use constant MAIN_PROBLEMS => '  Unclassified Problems  ';
use constant CREATE_SET_BUTTON => 'Create New Set';
use constant ALL_CHAPTERS => 'All Chapters';
use constant ALL_SUBJECTS => 'All Subjects';
use constant ALL_SECTIONS => 'All Sections';
use constant ALL_TEXTBOOKS => 'All Textbooks';

use constant LIB2_DATA => {
  'dbchapter' => {name => 'library_chapters', all => 'All Chapters'},
  'dbsection' =>  {name => 'library_sections', all =>'All Sections' },
  'dbsubject' =>  {name => 'library_subjects', all => 'All Subjects' },
  'textbook' =>  {name => 'library_textbook', all =>  'All Textbooks'},
  'textchapter' => {name => 'library_textchapter', all => 'All Chapters'},
  'textsection' => {name => 'library_textsection', all => 'All Sections'},
  'keywords' =>  {name => 'library_keywords', all => '' },
  };

## Flags for operations on files

use constant ADDED => 1;
use constant HIDDEN => (1 << 1);
use constant SUCCESS => (1 << 2);
use constant DELETED => (1 << 3);

##	for additional problib buttons
my %problib;	## filled in in global.conf
my %ignoredir = (
	'.' => 1, '..' => 1, 'Library' => 1, 'CVS' => 1, 'tmpEdit' => 1,
	'headers' => 1, 'macros' => 1, 'email' => 1, '.svn' => 1,
);

sub prepare_activity_entry {
	my $self=shift;
	my $r = $self->r;
	my $user = $self->r->param('user') || 'NO_USER';
	return("In SetMaker as user $user");
}

## This is for searching the disk for directories containing pg files.
## to make the recursion work, this returns an array where the first 
## item is the number of pg files in the directory.  The second is a
## list of directories which contain pg files.
##
## If a directory contains only one pg file and the directory name
## is the same as the file name, then the directory is considered
## to be part of the parent directory (it is probably in a separate
## directory only because it has auxiliary files that want to be
## kept together with the pg file).
##
## If a directory has a file named "=library-ignore", it is never
## included in the directory menu.  If a directory contains a file
## called "=library-combine-up", then its pg are included with those
## in the parent directory (and the directory does not appear in the
## menu).  If it has a file called "=library-no-combine" then it is
## always listed as a separate directory even if it contains only one
## pg file.

sub get_library_sets {
	my $top = shift; my $dir = shift;
	# ignore directories that give us an error
	my @lis = eval { readDirectory($dir) };
	if ($@) {
		warn $@;
		return (0);
	}
	return (0) if grep /^=library-ignore$/, @lis;

	my @pgfiles = grep { m/\.pg$/ and (not m/(Header|-text)\.pg$/) and -f "$dir/$_"} @lis;
	my $pgcount = scalar(@pgfiles);
	my $pgname = $dir; $pgname =~ s!.*/!!; $pgname .= '.pg';
	my $combineUp = ($pgcount == 1 && $pgname eq $pgfiles[0] && !(grep /^=library-no-combine$/, @lis));

	my @pgdirs;
	my @dirs = grep {!$ignoredir{$_} and -d "$dir/$_"} @lis;
	if ($top == 1) {@dirs = grep {!$problib{$_}} @dirs}
	foreach my $subdir (@dirs) {
		my @results = get_library_sets(0, "$dir/$subdir");
		$pgcount += shift @results; push(@pgdirs,@results);
	}

	return ($pgcount, @pgdirs) if $top || $combineUp || grep /^=library-combine-up$/, @lis;
	return (0,@pgdirs,$dir);
}

sub get_library_pgs {
	my $top = shift; my $base = shift; my $dir = shift;
	my @lis = readDirectory("$base/$dir");
	return () if grep /^=library-ignore$/, @lis;
	return () if !$top && grep /^=library-no-combine$/, @lis;

	my @pgs = grep { m/\.pg$/ and (not m/(Header|-text)\.pg$/) and -f "$base/$dir/$_"} @lis;
	my $others = scalar(grep { (!m/\.pg$/ || m/(Header|-text)\.pg$/) &&
	                            !m/(\.(tmp|bak)|~)$/ && -f "$base/$dir/$_" } @lis);

	my @dirs = grep {!$ignoredir{$_} and -d "$base/$dir/$_"} @lis;
	if ($top == 1) {@dirs = grep {!$problib{$_}} @dirs}
	foreach my $subdir (@dirs) {push(@pgs, get_library_pgs(0,"$base/$dir",$subdir))}

	return () unless $top || (scalar(@pgs) == 1 && $others) || grep /^=library-combine-up$/, @lis;
	return (map {"$dir/$_"} @pgs);
}

sub list_pg_files {
	my ($templates,$dir) = @_;
	my $top = ($dir eq '.')? 1 : 2;
	my @pgs = get_library_pgs($top,$templates,$dir);
	return sortByName(undef,@pgs);
}

## Search for set definition files

sub get_set_defs {
	my $topdir = shift;
	my @found_set_defs;
	# get_set_defs_wanted is a closure over @found_set_defs
	my $get_set_defs_wanted = sub {
		#my $fn = $_;
		#my $fdir = $File::Find::dir;
		#return() if($fn !~ /^set.*\.def$/);
		##return() if(not -T $fn);
		#push @found_set_defs, "$fdir/$fn";
		push @found_set_defs, $_ if m|/set[^/]*\.def$|;
	};
	find({ wanted => $get_set_defs_wanted, follow_fast=>1, no_chdir=>1}, $topdir);
	map { $_ =~ s|^$topdir/?|| } @found_set_defs;
	return @found_set_defs;
}

## Try to make reading of set defs more flexible.  Additional strategies
## for fixing a path can be added here.

sub munge_pg_file_path {
	my $self = shift;
	my $pg_path = shift;
	my $path_to_set_def = shift;
	my $end_path = $pg_path;
	# if the path is ok, don't fix it
	return($pg_path) if(-e $self->r->ce->{courseDirs}{templates}."/$pg_path");
	# if we have followed a link into a self contained course to get
	# to the set.def file, we need to insert the start of the path to
	# the set.def file
	$end_path = "$path_to_set_def/$pg_path";
	return($end_path) if(-e $self->r->ce->{courseDirs}{templates}."/$end_path");
	# if we got this far, this path is bad, but we let it produce
	# an error so the user knows there is a troublesome path in the
	# set.def file.
	return($pg_path);
}

## Read a set definition file.  This could be abstracted since it happens
## elsewhere.  Here we don't have to process so much of the file.

sub read_set_def {
	my $self = shift;
	my $r = $self->r;
	my $filePathOrig = shift;
	my $filePath = $r->ce->{courseDirs}{templates}."/$filePathOrig";
	$filePathOrig =~ s/set.*\.def$//;
	$filePathOrig =~ s|/$||;
	$filePathOrig = "." if ($filePathOrig !~ /\S/);
	my @pg_files = ();
	my ($line, $got_to_pgs, $name, @rest) = ("", 0, "");
	if ( open (SETFILENAME, "$filePath") )    {
		while($line = <SETFILENAME>) {
			chomp($line);
			$line =~ s|(#.*)||; # don't read past comments
			if($got_to_pgs) {
				unless ($line =~ /\S/) {next;} # skip blank lines
				($name,@rest) = split (/\s*,\s*/,$line);
				$name =~ s/\s*//g;
				push @pg_files, $name;
			} else {
				$got_to_pgs = 1 if ($line =~ /problemList\s*=/);
			}
		}
	} else {
		$self->addbadmessage("Cannot open $filePath");
	}
	# This is where we would potentially munge the pg file paths
	# One possibility
	@pg_files = map { $self->munge_pg_file_path($_, $filePathOrig) } @pg_files;
	return(@pg_files);
}

## go through past page getting a list of identifiers for the problems
## and whether or not they are selected, and whether or not they should
## be hidden

sub get_past_problem_files {
	my $r = shift;
	my @found=();
	my $count =1;
	while (defined($r->param("filetrial$count")) || defined($r->param("mysetfiletrial$count"))) {
		my $val = 0;
		$val |= ADDED if($r->param("trial$count"));
		$val |= DELETED if($r->param("deleted$count"));
		$val |= HIDDEN if($r->param("hideme$count"));
		if(defined($r->param("mysetfiletrial$count"))){
		  push @found, [$r->param("mysetfiletrial$count"), $val];
		}
		else{
		  push @found, [$r->param("filetrial$count"), $val];			
		}
		$count++;
	}
	
	return(\@found);
}

#### For adding new problems

sub add_selected {
	my $self = shift;
	my $db = shift;
	my $setName = shift;
	my @past_problems = @{$self->{past_problems}};
	my @selected = @past_problems;
	my (@path, $file, $selected, $freeProblemID);
	# DBFIXME count would work just as well
	$freeProblemID = max($db->listGlobalProblems($setName)) + 1;
	my $addedcount=0;

	for $selected (@selected) {
		if($selected->[1] & ADDED) {
			$file = $selected->[0];
			my $problemRecord = $self->addProblemToSet(setName => $setName,
				sourceFile => $file, problemID => $freeProblemID);
			$freeProblemID++;
			$self->assignProblemToAllSetUsers($problemRecord);
			$selected->[1] |= SUCCESS;
			$addedcount++;
		}
		if($selected->[1] & DELETED) {
		  foreach my $problem ($db->listGlobalProblems($setName)) {
			  my $problemRecord = $db->getGlobalProblem($setName, $problem);
			  if($problemRecord->source_file eq $selected->[0]){
			    $db->deleteGlobalProblem($setName, $problemRecord->problem_id);
			  }
		  }
			$selected->[1] |= SUCCESS;
			$addedcount++;
		}
	}
	return($addedcount);
}


############# List of sets of problems in templates directory

sub get_problem_directories {
	my $ce = shift;
	my $lib = shift;
	my $source = $ce->{courseDirs}{templates};
	my $main = MY_PROBLEMS; my $isTop = 1;
	if ($lib) {$source .= "/$lib"; $main = MAIN_PROBLEMS; $isTop = 2}
	my @all_problem_directories = get_library_sets($isTop, $source);
	my $includetop = shift @all_problem_directories;
	my $j;
	for ($j=0; $j<scalar(@all_problem_directories); $j++) {
		$all_problem_directories[$j] =~ s|^$ce->{courseDirs}->{templates}/?||;
	}
	@all_problem_directories = sortByName(undef, @all_problem_directories);
	unshift @all_problem_directories, $main if($includetop);
	return (\@all_problem_directories);
}

############# Everyone has a view problems line.	Abstract it
sub view_problems_line {
	my $internal_name = shift;
	my $label = shift;
	my $r = shift; # so we can get parameter values
	my $result = CGI::submit(-name=>"$internal_name", -value=>$label);

	my %display_modes = %{WeBWorK::PG::DISPLAY_MODES()};
	my @active_modes = grep { exists $display_modes{$_} }
		@{$r->ce->{pg}->{displayModes}};
	push @active_modes, 'None';
	# We have our own displayMode since its value may be None, which is illegal
	# in other modules.
	my $mydisplayMode = $r->param('mydisplayMode') || $r->ce->{pg}->{options}->{displayMode};
	$result .= '&nbsp;Display&nbsp;Mode:&nbsp;'.CGI::popup_menu(-name=> 'mydisplayMode',
	                                                            -values=>\@active_modes,
	                                                            -default=> $mydisplayMode);
	# Now we give a choice of the number of problems to show
	my $defaultMax = $r->param('max_shown') || MAX_SHOW_DEFAULT;
	$result .= '&nbsp;Max. Shown:&nbsp'.
		CGI::popup_menu(-name=> 'max_shown',
		                -values=>[5,10,15,20,25,30,50,'All'],
		                -default=> $defaultMax);
	# Option of whether to show hints and solutions
	my $defaultHints = $r->param('showHints') || SHOW_HINTS_DEFAULT;
	$result .= "&nbsp;".CGI::checkbox(-name=>"showHints",-checked=>$defaultHints,-label=>"Hints");
	my $defaultSolutions = $r->param('showSolutions') || SHOW_SOLUTIONS_DEFAULT;
	$result .= "&nbsp;".CGI::checkbox(-name=>"showSolutions",-checked=>$defaultSolutions,-label=>"Solutions");
	
	return($result);
}


### The browsing panel has three versions
#####	 Version 1 is local problems
sub browse_local_panel {
	my $self = shift;
	my $library_selected = shift;
	my $lib = shift || ''; $lib =~ s/^browse_//;
	my $name = ($lib eq '')? 'Local' : $problib{$lib};
    
	my $list_of_prob_dirs= get_problem_directories($self->r->ce,$lib);
	if(scalar(@$list_of_prob_dirs) == 0) {
		$library_selected = "Found no directories containing problems";
		unshift @{$list_of_prob_dirs}, $library_selected;
	} else {
		my $default_value = SELECT_LOCAL_STRING;
		if (not $library_selected or $library_selected eq $default_value) {
			unshift @{$list_of_prob_dirs},	$default_value;
			$library_selected = $default_value;
		}
	}
	debug("library is $lib and sets are $library_selected");
	my $view_problem_line = view_problems_line('view_local_set', 'View Problems', $self->r);
	my @popup_menu_args = (
		-name => 'library_sets',
		-values => $list_of_prob_dirs,
		-default => $library_selected,
	);
	# make labels without the $lib prefix -- reduces the width of the popup menu
	if (length($lib)) {
		my %labels = map { my($l)=$_=~/^$lib\/(.*)$/;$_=>$l } @$list_of_prob_dirs;
		push @popup_menu_args, -labels => \%labels;
	}
	print CGI::div({-class=>"InfoPanel", -align=>"left"}, "$name Problems: ",
		              CGI::popup_menu(@popup_menu_args),
		              CGI::br(), 
		              $view_problem_line,
	);
}

#####	 Version 2 is local homework sets
sub browse_mysets_panel {
	my $self = shift;
	my $library_selected = shift;
	my $list_of_local_sets = shift;
	my $remember_local_set = shift;
	my $default_value = "Select a Homework Set";

	if(scalar(@$list_of_local_sets) == 0) {
		$list_of_local_sets = [NO_LOCAL_SET_STRING];
	} elsif (not $library_selected or $library_selected eq $default_value) { 
		unshift @{$list_of_local_sets},	 $default_value; 
		$library_selected = $default_value; 
	} 

	#my $view_problem_line = view_problems_line('view_mysets_set', 'View Problems', $self->r);
	print CGI::div({-class=>"InfoPanel", -align=>"left"},
	  CGI::submit(-name=>"update", -style=>"width: 25ex; font-weight:bold;",
			            -value=>"Update Set"),
		CGI::popup_menu(-name=> 'myset_sets', 
		                -values=>$list_of_local_sets, 
		                -default=> $library_selected),
		CGI::hidden(-name=> 'local_sets', -value=>$remember_local_set),
		CGI::br(), 
		CGI::submit(-name=>"view_mysets_set", -value=>"View Set"),
	);
}

#####	 Version 2.1 is local homework sets
sub edit_mysets_panel {
	my $self = shift;
	my $library_selected = shift;
	my $list_of_local_sets = shift;
	my $remember_local_set = shift;
	my $default_value = "Select a Homework Set";

	if(scalar(@$list_of_local_sets) == 0) {
		$list_of_local_sets = [NO_LOCAL_SET_STRING];
	} elsif (not $library_selected or $library_selected eq $default_value) { 
		unshift @{$list_of_local_sets},	 $default_value; 
		$library_selected = $default_value; 
	} 

	#my $view_problem_line = view_problems_line('view_mysets_set', 'View Problems', $self->r);
	print CGI::div({-class=>"InfoPanel", -align=>"left"},
	  CGI::submit(-name=>"update", -style=>"width: 25ex; font-weight:bold;",
			            -value=>"Update Set"),
		CGI::popup_menu(-name=> 'library_sets', 
		                -values=>$list_of_local_sets, 
		                -default=> $library_selected),
		CGI::br(), 
		CGI::submit(-name=>"edit_mysets_set", -value=>"View Set"),
	);
}

#####	 Version 3 is the problem library
# 
# This comes in 3 forms, problem library version 1, and for version 2 there
# is the basic, and the advanced interfaces.  This function checks what we are
# supposed to do, or aborts if the problem library has not been installed.

sub browse_library_panel {
	my $self=shift;
	my $r = $self->r;
	my $ce = $r->ce;

	# See if the problem library is installed
	my $libraryRoot = $r->{ce}->{problemLibrary}->{root};

	unless($libraryRoot) {
		print CGI::div({class=>'ResultsWithError', align=>"center"}, 
			"The problem library has not been installed.");
		return;
	}
	# Test if the Library directory link exists.  If not, try to make it
	unless(-d "$ce->{courseDirs}->{templates}/Library") {
		unless(symlink($libraryRoot, "$ce->{courseDirs}->{templates}/Library")) {
			my $msg =	 <<"HERE";
You are missing the directory <code>templates/Library</code>, which is needed
for the Problem Library to function.	It should be a link pointing to
<code>$libraryRoot</code>, which you set in <code>conf/global.conf</code>.
I tried to make the link for you, but that failed.	Check the permissions
in your <code>templates</code> directory.
HERE
			$self->addbadmessage($msg);
		}
	}

	# Now check what version we are supposed to use
	my $libraryVersion = $r->{ce}->{problemLibrary}->{version} || 1;
	if($libraryVersion == 1) {
		return $self->browse_library_panel1;
	} elsif($libraryVersion == 2) {
		return $self->browse_library_panel2	if($self->{library_basic}==1);
		return $self->browse_library_panel2adv;
	} else {
		print CGI::div({class=>'ResultsWithError', align=>"center"}, 
			"The problem library version is set to an illegal value.");
		return;
	}
}

sub browse_library_panel1 {
	my $self = shift;
	my $r = $self->r;
	my $ce = $r->ce;
	
	my @chaps = WeBWorK::Utils::ListingDB::getAllChapters($r->{ce});
	unshift @chaps, LIB2_DATA->{dbchapter}{all};
	my $chapter_selected = $r->param('library_chapters') || LIB2_DATA->{dbchapter}->{all};

	my @sects=();
	if ($chapter_selected ne LIB2_DATA->{dbchapter}{all}) {
		@sects = WeBWorK::Utils::ListingDB::getAllSections($r->{ce}, $chapter_selected);
	}

	unshift @sects, ALL_SECTIONS;
	my $section_selected =	$r->param('library_sections') || LIB2_DATA->{dbsection}{all};

	my $view_problem_line = view_problems_line('lib_view', 'View Problems', $self->r);

	print CGI::div({-class=>"InfoPanel", -align=>"left"},
				CGI::div(["Chapter:",
					CGI::popup_menu(-name=> 'library_chapters', 
					                -values=>\@chaps,
					                -default=> $chapter_selected,
					                -onchange=>"submit();return true"
					),
					CGI::submit(-name=>"lib_select_chapter", -value=>"Update Section List")]),
				CGI::div("Section:", 
					CGI::popup_menu(-name=> 'library_sections', 
					                -values=>\@sects,
					                -default=> $section_selected
			)),
			CGI::div($view_problem_line)
		);
}

sub browse_library_panel2 {
	my $self = shift;
	my $r = $self->r;
	my $ce = $r->ce;

	my @subjs = WeBWorK::Utils::ListingDB::getAllDBsubjects($r);
	unshift @subjs, LIB2_DATA->{dbsubject}{all};

	my @chaps = WeBWorK::Utils::ListingDB::getAllDBchapters($r);
	unshift @chaps, LIB2_DATA->{dbchapter}{all};

	my @sects=();
	@sects = WeBWorK::Utils::ListingDB::getAllDBsections($r);
	unshift @sects, LIB2_DATA->{dbsection}{all};

	my $subject_selected = $r->param('library_subjects') || LIB2_DATA->{dbsubject}{all};
	my $chapter_selected = $r->param('library_chapters') || LIB2_DATA->{dbchapter}{all};
	my $section_selected =	$r->param('library_sections') || LIB2_DATA->{dbsection}{all};

	my $view_problem_line = view_problems_line('lib_view', 'View Problems', $self->r);

	my $count_line = WeBWorK::Utils::ListingDB::countDBListings($r);
	if($count_line==0) {
		$count_line = "There are no matching pg files";
	} else {
		$count_line = "There are $count_line matching WeBWorK problem files";
	}

	print CGI::div({-class=>"InfoPanel", -align=>"left"}, 
		CGI::hidden(-name=>"library_is_basic", -default=>1,-override=>1),
		CGI::div(["Subject:",
				CGI::popup_menu(-name=> 'library_subjects', 
					            -values=>\@subjs,
					            -default=> $subject_selected,
					             -onchange=>"submit();return true"
				)]),
			CGI::div({-colspan=>2, -align=>"right"},
				CGI::submit(-name=>"lib_select_subject", -value=>"Update Chapter/Section Lists")),
			CGI::div(["Chapter:",
				CGI::popup_menu(-name=> 'library_chapters', 
					            -values=>\@chaps,
					            -default=> $chapter_selected,
					             -onchange=>"submit();return true"
		    )]),
			CGI::div({-colspan=>2, -align=>"right"},
					CGI::submit(-name=>"library_advanced", -value=>"Advanced Search")),
			CGI::div(["Section:",
			CGI::popup_menu(-name=> 'library_sections', 
					        -values=>\@sects,
					        -default=> $section_selected,
							-onchange=>"submit();return true"
		    )]),
		    CGI::div({-colspan=>3}, $view_problem_line),
		    CGI::div({-colspan=>3, -align=>"center"}, $count_line)
	 );
	
}

sub browse_library_panel2adv {
	my $self = shift;
	my $r = $self->r;
	my $ce = $r->ce;
	my $right_button_style = "width: 18ex";

	my @subjs = WeBWorK::Utils::ListingDB::getAllDBsubjects($r);
	if(! grep { $_ eq $r->param('library_subjects') } @subjs) {
		$r->param('library_subjects', '');
	}
	unshift @subjs, LIB2_DATA->{dbsubject}{all};

	my @chaps = WeBWorK::Utils::ListingDB::getAllDBchapters($r);
	if(! grep { $_ eq $r->param('library_chapters') } @chaps) {
		$r->param('library_chapters', '');
	}
	unshift @chaps, LIB2_DATA->{dbchapter}{all};

	my @sects = WeBWorK::Utils::ListingDB::getAllDBsections($r);
	if(! grep { $_ eq $r->param('library_sections') } @sects) {
		$r->param('library_sections', '');
	}
	unshift @sects, LIB2_DATA->{dbsection}{all};

	my $texts = WeBWorK::Utils::ListingDB::getDBTextbooks($r);
	my @textarray = map { $_->[0] }  @{$texts};
	my %textlabels = ();
	for my $ta (@{$texts}) {
		$textlabels{$ta->[0]} = $ta->[1]." by ".$ta->[2]." (edition ".$ta->[3].")";
	}
	if(! grep { $_ eq $r->param('library_textbook') } @textarray) {
		$r->param('library_textbook', '');
	}
	unshift @textarray, LIB2_DATA->{textbook}{all};
	my $atb = LIB2_DATA->{textbook}{all}; $textlabels{$atb} = LIB2_DATA->{textbook}{all};

	my $textchap_ref = WeBWorK::Utils::ListingDB::getDBTextbooks($r, 'textchapter');
	my @textchaps = map { $_->[0] } @{$textchap_ref};
	if(! grep { $_ eq $r->param('library_textchapter') } @textchaps) {
		$r->param('library_textchapter', '');
	}
	unshift @textchaps, LIB2_DATA->{textchapter}{all};

	my $textsec_ref = WeBWorK::Utils::ListingDB::getDBTextbooks($r, 'textsection');
	my @textsecs = map { $_->[0] } @{$textsec_ref};
	if(! grep { $_ eq $r->param('library_textsection') } @textsecs) {
		$r->param('library_textsection', '');
	}
	unshift @textsecs, LIB2_DATA->{textsection}{all};

	my %selected = ();
	for my $j (qw( dbsection dbchapter dbsubject textbook textchapter textsection )) {
		$selected{$j} = $r->param(LIB2_DATA->{$j}{name}) || LIB2_DATA->{$j}{all};
	}

	my $text_popup = CGI::popup_menu(-name => 'library_textbook',
									 -values =>\@textarray,
									 -labels => \%textlabels,
									 -default=>$selected{textbook},
									 -onchange=>"submit();return true");

	
	my $library_keywords = $r->param('library_keywords') || '';

	my $view_problem_line = view_problems_line('lib_view', 'View Problems', $self->r);

	my $count_line = WeBWorK::Utils::ListingDB::countDBListings($r);
	if($count_line==0) {
		$count_line = "There are no matching pg files";
	} else {
		$count_line = "There are $count_line matching WeBWorK problem files";
	}

	print CGI::div({-class=>"InfoPanel", -align=>"left"},
		CGI::hidden(-name=>"library_is_basic", -default=>2,-override=>1),
		# Html done by hand since it is temporary
		CGI::div({-colspan=>4, -align=>"center"}, 'All Selected Constraints Joined by "And"'),
			CGI::div(["Subject:",
				CGI::popup_menu(-name=> 'library_subjects', 
					            -values=>\@subjs,
					            -default=> $selected{dbsubject},
					             -onchange=>"submit();return true"
				)]),
			CGI::div({-colspan=>2, -align=>"right"},
				CGI::submit(-name=>"lib_select_subject", -value=>"Update Menus",
					-style=> $right_button_style)),
			CGI::div(["Chapter:",
				CGI::popup_menu(-name=> 'library_chapters', 
					            -values=>\@chaps,
					            -default=> $selected{dbchapter},
					             -onchange=>"submit();return true"
		    )]),
			CGI::div({-colspan=>2, -align=>"right"},
					CGI::submit(-name=>"library_reset", -value=>"Reset",
					-style=>$right_button_style)),
			CGI::div(["Section:",
			CGI::popup_menu(-name=> 'library_sections', 
					        -values=>\@sects,
					        -default=> $selected{dbsection},
							-onchange=>"submit();return true"
		    )]),
			CGI::div({-colspan=>2, -align=>"right"},
					CGI::submit(-name=>"library_basic", -value=>"Basic Search",
					-style=>$right_button_style)),
			CGI::div(["Textbook:", $text_popup]),
			CGI::div(["Text chapter:",
			CGI::popup_menu(-name=> 'library_textchapter', 
					        -values=>\@textchaps,
					        -default=> $selected{textchapter},
							-onchange=>"submit();return true"
		    )]),
			CGI::div(["Text section:",
			CGI::popup_menu(-name=> 'library_textsection', 
					        -values=>\@textsecs,
					        -default=> $selected{textsection},
							-onchange=>"submit();return true"
		    )]),
		     CGI::div("Keywords:"),CGI::div({-colspan=>2},
			 CGI::textfield(-name=>"library_keywords",
							-default=>$library_keywords,
							-override=>1,
							-size=>40)),
      CGI::div({-colspan=>3}, $view_problem_line),
      CGI::div({-colspan=>3, -align=>"center"}, $count_line)
	 );
	
}


#####	 Version 4 is the set definition file panel

sub browse_setdef_panel {
	my $self = shift;
	my $r = $self->r;
	my $ce = $r->ce;
	my $library_selected = shift;
	my $default_value = "Select a Set Definition File";
	# in the following line, the parens after sort are important. if they are
	# omitted, sort will interpret get_set_defs as the name of the comparison
	# function, and ($ce->{courseDirs}{templates}) as a single element list to
	# be sorted. *barf*
	my @list_of_set_defs = sort(get_set_defs($ce->{courseDirs}{templates}));
	if(scalar(@list_of_set_defs) == 0) {
		@list_of_set_defs = (NO_LOCAL_SET_STRING);
	} elsif (not $library_selected or $library_selected eq $default_value) { 
		unshift @list_of_set_defs, $default_value; 
		$library_selected = $default_value; 
	}
	my $view_problem_line = view_problems_line('view_setdef_set', 'View Problems', $self->r);
	my $popupetc = CGI::popup_menu(-name=> 'library_sets',
                                -values=>\@list_of_set_defs,
                                -default=> $library_selected).
		CGI::br().  $view_problem_line;
	if($list_of_set_defs[0] eq NO_LOCAL_SET_STRING) {
		$popupetc = "there are no set definition files in this course to look at."
	}
	print CGI::div({-class=>"InfoPanel", -align=>"left"}, "Browse from: ",
		$popupetc
	);
}

sub make_mysets_row {
  my $self = shift;
	my $r = $self->r;
	my $ce = $r->ce;
	my %data = @_;

	my $list_of_local_sets = $data{all_db_sets};
	my $have_local_sets = scalar(@$list_of_local_sets);
	my $browse_which = 'browse_mysets';
	my $library_selected = $self->{current_myset_set};
	my $set_selected = $r->param('myset_sets');
	my $remember_local_set = $r->param('local_sets');

	##	Make buttons for additional problem libraries
	#my $libs = '';
	#foreach my $lib (sort(keys(%problib))) {
	#	$libs .= ' '. CGI::submit(-name=>"browse_$lib", -value=>$problib{$lib},
	#															 ($browse_which eq "browse_$lib")? (-disabled=>1): ())
	#		if (-d "$ce->{courseDirs}{templates}/$lib");
	#}
	#$libs = CGI::br()."or Problems from".$libs if $libs ne '';

	my $these_widths = "width: 25ex";

	if($have_local_sets ==0) {
		$list_of_local_sets = [NO_LOCAL_SET_STRING];
	} elsif (not defined($set_selected) or $set_selected eq ""
	  or $set_selected eq SELECT_SET_STRING) {
		unshift @{$list_of_local_sets}, SELECT_SET_STRING;
		$set_selected = SELECT_SET_STRING;
	}
	my $myjs = 'document.mainform.selfassign.value=confirm("Should I assign the new set to you now?\nUse OK for yes and Cancel for no.");true;';

	# Tidy this list up since it is used in two different places
	if ($list_of_local_sets->[0] eq SELECT_SET_STRING) {
		shift @{$list_of_local_sets};
	}

	#print CGI::div(CGI::div({-bgcolor=>"black"}));
	#print CGI::hr();

	$self->browse_mysets_panel($library_selected, $list_of_local_sets, $remember_local_set);
}

sub make_top_row {
	my $self = shift;
	my $r = $self->r;
	my $ce = $r->ce;
	my %data = @_;

	my $list_of_local_sets = $data{all_db_sets};
	my $have_local_sets = scalar(@$list_of_local_sets);
	my $browse_which = $data{browse_which};
	my $library_selected = $self->{current_library_set};
	my $set_selected = $r->param('local_sets');
	my (@dis1, @dis2, @dis3, @dis4) = ();
	@dis1 =	 (-disabled=>1) if($browse_which eq 'browse_npl_library');	 
	@dis2 =	 (-disabled=>1) if($browse_which eq 'browse_local');
	@dis3 =	 (-disabled=>1) if($browse_which eq 'browse_mysets');
	@dis4 =	 (-disabled=>1) if($browse_which eq 'browse_setdefs');

	##	Make buttons for additional problem libraries
	my $libs = '';
	foreach my $lib (sort(keys(%problib))) {
		$libs .= ' '. CGI::submit(-name=>"browse_$lib", -value=>$problib{$lib},
																 ($browse_which eq "browse_$lib")? (-disabled=>1): ())
			if (-d "$ce->{courseDirs}{templates}/$lib");
	}
	$libs = CGI::br()."or Problems from".$libs if $libs ne '';

	my $these_widths = "width: 25ex";

	if($have_local_sets ==0) {
		$list_of_local_sets = [NO_LOCAL_SET_STRING];
	} elsif (not defined($set_selected) or $set_selected eq ""
	  or $set_selected eq SELECT_SET_STRING) {
		unshift @{$list_of_local_sets}, SELECT_SET_STRING;
		$set_selected = SELECT_SET_STRING;
	}
	my $myjs = 'document.mainform.selfassign.value=confirm("Should I assign the new set to you now?\nUse OK for yes and Cancel for no.");true;';
## edited this, as a demo for the current set problem list
	print CGI::div({-class=>"InfoPanel", -align=>"left"},
		CGI::submit(-name=>"new_local_set", -value=>"Create a New Set in This Course:",
		-onclick=>$myjs
		),
		"  ",
		CGI::textfield(-name=>"new_set_name", 
					   -default=>"Name for new set here",
					   -override=>1, -size=>30),
	);

	# Tidy this list up since it is used in two different places
	if ($list_of_local_sets->[0] eq SELECT_SET_STRING) {
		shift @{$list_of_local_sets};
	}

	print CGI::div({-class=>"InfoPanel", -align=>"center"},
		"Browse ",
		CGI::submit(-name=>"browse_npl_library", -value=>"National Problem Library", -style=>$these_widths, @dis1),
		CGI::submit(-name=>"browse_local", -value=>"Local Problems", -style=>$these_widths, @dis2),
		CGI::submit(-name=>"browse_mysets", -value=>"From This Course", -style=>$these_widths, @dis3),
		CGI::submit(-name=>"browse_setdefs", -value=>"Set Definition Files", -style=>$these_widths, @dis4),
		$libs,
	);

	if ($browse_which eq 'browse_local') {
		$self->browse_local_panel($library_selected);
	} elsif ($browse_which eq 'browse_mysets') {
		$self->edit_mysets_panel($library_selected, $list_of_local_sets);
	} elsif ($browse_which eq 'browse_npl_library') {
		$self->browse_library_panel();
	} elsif ($browse_which eq 'browse_setdefs') {
		$self->browse_setdef_panel($library_selected);
	} else { ## handle other problem libraries
		$self->browse_local_panel($library_selected,$browse_which);
	}

	print CGI::div({-class=>"InfoPanel", -align=>"center"},
			       CGI::submit(-name=>"select_all", -style=>$these_widths,
			            -value=>"Mark All For Adding"),
			       CGI::submit(-name=>"select_none", -style=>$these_widths,
			            -value=>"Clear All Marks"),
		     ), 
		CGI::div({},
		    CGI::submit(-name=>"rerandomize", 
		                -style=>$these_widths,
		                -value=>"Rerandomize"),
		    CGI::submit(-name=>"cleardisplay", 
		            -style=>$these_widths,
		            -value=>"Clear Problem Display")
	  );
}

sub make_data_row {
	my $self = shift;
	my $sourceFileName = shift;
	my $pg = shift;
	my $cnt = shift;
	my $mark = shift || 0;

	$sourceFileName =~ s|^./||; # clean up top ugliness

	my $urlpath = $self->r->urlpath;
	my $db = $self->r->db;

	## to set up edit and try links elegantly we want to know if
	##    any target set is a gateway assignment or not
	my $localSet = $self->r->param('local_sets');
	my $setRecord;
	if ( defined($localSet) && $localSet ne SELECT_SET_STRING &&
	     $localSet ne NO_LOCAL_SET_STRING ) {
		$setRecord = $db->getGlobalSet( $localSet );
	}
	my $isGatewaySet = ( defined($setRecord) && 
			     $setRecord->assignment_type =~ /gateway/ );

	my $problem_output = $pg->{flags}->{error_flag} ?
		CGI::div({class=>"ResultsWithError"}, CGI::em("This problem produced an error"))
		: CGI::div({class=>"RenderSolo"}, $pg->{body_text});
	$problem_output .= $pg->{flags}->{comment} if($pg->{flags}->{comment});


	#if($self->{r}->param('browse_which') ne 'browse_npl_library') {
	my $problem_seed = $self->{'problem_seed'} || 1234;
	my $edit_link = CGI::a({href=>$self->systemLink(
		 $urlpath->newFromModule("WeBWorK::ContentGenerator::Instructor::PGProblemEditor",
			  courseID =>$urlpath->arg("courseID"),
			  setID=>"Undefined_Set",
			  problemID=>"1"),
			params=>{sourceFilePath => "$sourceFileName", problemSeed=> $problem_seed}
		  ), target=>"WW_Editor"}, "Edit it" );
	
	my $displayMode = $self->r->param("mydisplayMode");
	$displayMode = $self->r->ce->{pg}->{options}->{displayMode}
		if not defined $displayMode or $displayMode eq "None";
	my $module = ( $isGatewaySet ) ? "GatewayQuiz" : "Problem";
	my %pathArgs = ( courseID =>$urlpath->arg("courseID"),
			setID=>"Undefined_Set" );
	$pathArgs{problemID} = "1" if ( ! $isGatewaySet );

	my $try_link = CGI::a({href=>$self->systemLink(
		$urlpath->newFromModule("WeBWorK::ContentGenerator::$module",
			%pathArgs ),
			params =>{
				effectiveUser => scalar($self->r->param('user')),
				editMode => "SetMaker",
				problemSeed=> $problem_seed,
				sourceFilePath => "$sourceFileName",
				displayMode => $displayMode,
			}
		), target=>"WW_View"}, "Try it");

	my %add_box_data = ( -id=>"trial$cnt" ,-name=>"trial$cnt",-value=>1,-label=>"Add this problem to the target set on the next update");
	if($mark & SUCCESS) {
		$add_box_data{ -label } .= " (just added this problem)";
	} elsif($mark & ADDED) {
		$add_box_data{ -checked } = 1;
	}

	if(!($self->{isInSet}{$sourceFileName})){

  	print CGI::div({-align=>"left", -draggable=>"true", -href=>"#", -id=>"$cnt"},
  		CGI::div({-style=>"background-color: #DDDDDD; margin: 0px auto"},
  			CGI::span({-style=>"float:left ; text-align: left"},"File name: $sourceFileName "), 
  			CGI::span({-style=>"float:right ; text-align: right"}, $edit_link, " ", $try_link)
  		), CGI::br(),
  		CGI::checkbox(-id=>"hideme$cnt", -name=>"hideme$cnt",-value=>1,-label=>"Don't show this problem on the next update",-override=>1),
  		CGI::br(),
  		CGI::checkbox((%add_box_data),-override=>1),
  		CGI::hidden(-name=>"filetrial$cnt", -default=>$sourceFileName,-override=>1).
  		CGI::p($problem_output)
	  );
	}
	else{
	  print CGI::div({-class=>"used", -align=>"left", -draggable=>"true", -href=>"#", -id=>"$cnt"},
  		CGI::div({-style=>"background-color: #AAAAA; margin: 0px auto"},
  			CGI::span({-style=>"float:left ; text-align: left"},"File name: $sourceFileName "), 
  			CGI::span({-style=>"float:right ; text-align: right"}, $edit_link, " ", $try_link)
  		), CGI::br(),
  		CGI::checkbox(-id=>"hideme$cnt", -name=>"hideme$cnt",-value=>1,-label=>"Don't show this problem on the next update",-override=>1),
  		CGI::br(),
  		CGI::checkbox((%add_box_data),-override=>1),
  		CGI::hidden(-name=>"filetrial$cnt", -default=>$sourceFileName,-override=>1).
  		CGI::p($problem_output),
  		CGI::b("(This problem is in the target set)")
	  );
	}
}

sub make_myset_data_row {
	my $self = shift;
	my $sourceFileName = shift;
	my $pg = shift;
	my $cnt = shift;
	my $mark = shift || 0;

	$sourceFileName =~ s|^./||; # clean up top ugliness

	my $urlpath = $self->r->urlpath;
	my $db = $self->r->db;

	## to set up edit and try links elegantly we want to know if
	##    any target set is a gateway assignment or not
	my $localSet = $self->r->param('local_sets');
	my $setRecord;
	if ( defined($localSet) && $localSet ne SELECT_SET_STRING &&
	     $localSet ne NO_LOCAL_SET_STRING ) {
		$setRecord = $db->getGlobalSet( $localSet );
	}
	my $isGatewaySet = ( defined($setRecord) && 
			     $setRecord->assignment_type =~ /gateway/ );

	my $problem_output = $pg->{flags}->{error_flag} ?
		CGI::div({class=>"ResultsWithError"}, CGI::em("This problem produced an error"))
		: CGI::div({class=>"RenderSolo"}, $pg->{body_text});
	$problem_output .= $pg->{flags}->{comment} if($pg->{flags}->{comment});


	#if($self->{r}->param('browse_which') ne 'browse_npl_library') {
	my $problem_seed = $self->{'problem_seed'} || 1234;
	my $edit_link = CGI::a({href=>$self->systemLink(
		 $urlpath->newFromModule("WeBWorK::ContentGenerator::Instructor::PGProblemEditor",
			  courseID =>$urlpath->arg("courseID"),
			  setID=>"Undefined_Set",
			  problemID=>"1"),
			params=>{sourceFilePath => "$sourceFileName", problemSeed=> $problem_seed}
		  ), target=>"WW_Editor"}, "Edit it" );
	
	my %delete_box_data = ( -id=>"deleted$cnt".'myset' ,-name=>"deleted$cnt",-value=>1,-label=>"Delete this problem from the target set on the next update");
	
	my $displayMode = $self->r->param("mydisplayMode");
	$displayMode = $self->r->ce->{pg}->{options}->{displayMode}
		if not defined $displayMode or $displayMode eq "None";
	my $module = ( $isGatewaySet ) ? "GatewayQuiz" : "Problem";
	my %pathArgs = ( courseID =>$urlpath->arg("courseID"),
			setID=>"Undefined_Set" );
	$pathArgs{problemID} = "1" if ( ! $isGatewaySet );

	my $try_link = CGI::a({href=>$self->systemLink(
		$urlpath->newFromModule("WeBWorK::ContentGenerator::$module",
			%pathArgs ),
			params =>{
				effectiveUser => scalar($self->r->param('user')),
				editMode => "SetMaker",
				problemSeed=> $problem_seed,
				sourceFilePath => "$sourceFileName",
				displayMode => $displayMode,
			}
		), target=>"WW_View"}, "Try it");

	print CGI::div({-class=>"problem myProblem", -draggable=>"true", -href=>"#", -id=>("$cnt".'myset')},
		CGI::div({-style=>"background-color: #DDDDDD; margin: 0px auto"},
			CGI::span({-style=>"float:left ; text-align: left"},"File name: $sourceFileName "), 
			CGI::span({-style=>"float:right ; text-align: right"}, $edit_link, " ", $try_link)
		), CGI::br(),
		CGI::br(),
		CGI::checkbox((%delete_box_data),-override=>1),
		CGI::hidden(-name=>"mysetfiletrial$cnt", -default=>$sourceFileName,-override=>1).
		CGI::p($problem_output),
	);
}

sub clear_default {
	my $r = shift;
	my $param = shift;
	my $default = shift;
	my $newvalue = $r->param($param) || '';
	$newvalue = '' if($newvalue eq $default);
	$r->param($param, $newvalue);
}

sub pre_header_initialize {
	my ($self) = @_;
	my $r = $self->r;
	## For all cases, lets set some things
	$self->{error}=0;
	my $ce = $r->ce;
	my $db = $r->db;
	my $maxShown = $r->param('max_shown') || MAX_SHOW_DEFAULT;
	$maxShown = 10000000 if($maxShown eq 'All'); # let's hope there aren't more
	my $library_basic = $r->param('library_is_basic') || 1;
	$self->{problem_seed} = $r->param('problem_seed') || 1234;
	## Fix some parameters
	for my $key (keys(%{ LIB2_DATA() })) {
		clear_default($r, LIB2_DATA->{$key}->{name}, LIB2_DATA->{$key}->{all} );
	}
    ##  Grab library sets to display from parameters list.  We will modify this
    ##  as we go through the if/else tree
    $self->{current_library_set} =  $r->param('library_sets');
    $self->{current_myset_set} = $r->param('myset_sets');
    if (not defined($self->{current_myset_set}) 
		or $self->{current_myset_set} eq "Select a Homework Set"
		or $self->{current_myset_set} eq NO_LOCAL_SET_STRING) {
      my @all_db_sets = $db->listGlobalSets;
	    @all_db_sets = sortByName(undef, @all_db_sets);
	    $self->{current_myset_set} = shift(@all_db_sets);
	  }
    
	##	These directories will have individual buttons
	%problib = %{$ce->{courseFiles}{problibs}} if $ce->{courseFiles}{problibs};

	my $userName = $r->param('user');
	my $user = $db->getUser($userName); # checked 
	die "record for user $userName (real user) does not exist." 
		unless defined $user;
	my $authz = $r->authz;
	unless ($authz->hasPermissions($userName, "modify_problem_sets")) {
		return(""); # Error message already produced in the body
	}

	## Now one action we have to deal with here
	if ($r->param('edit_local')) {
		my $urlpath = $r->urlpath;
		my $db = $r->db;
		my $checkset = $db->getGlobalSet($r->param('local_sets'));
		if (not defined($checkset)) {
			$self->{error} = 1;
			$self->addbadmessage('You need to select a "Target Set" before you can edit it.');
		} else {
			my $page = $urlpath->newFromModule('WeBWorK::ContentGenerator::Instructor::ProblemSetDetail', setID=>$r->param('local_sets'), courseID=>$urlpath->arg("courseID"));
			my $url = $self->systemLink($page);
			$self->reply_with_redirect($url);
		}
	}

	## Next, lots of set up so that errors can be reported with message()

	############# List of problems we have already printed

	$self->{past_problems} = get_past_problem_files($r);
	# if we don't end up reusing problems, this will be wiped out
	# if we do redisplay the same problems, we must adjust this accordingly
	my @past_marks = map {$_->[1]} @{$self->{past_problems}};
	my $none_shown = scalar(@{$self->{past_problems}})==0;
	my @pg_files=();
	my @myset_files=();
	my $use_previous_problems = 1;
	my $first_shown = $r->param('first_shown') || 0;
	my $last_shown = $r->param('last_shown'); 
	if (not defined($last_shown)) {
		$last_shown = -1; 
	}
	my @all_past_list = (); # these are include requested, but not shown
	my $j = 0;
	while (defined($r->param("all_past_list$j"))) {
		push @all_past_list, $r->param("all_past_list$j");
		$j++;
	}

	############# Default of which problem selector to display

	my $browse_which = $r->param('browse_which') || 'browse_npl_library';

	

	## check for problem lib buttons
	my $browse_lib = '';
	foreach my $lib (keys %problib) {
		if ($r->param("browse_$lib")) {
			$browse_lib = "browse_$lib";
			last;
		}
	}


	########### Start the logic through if elsif elsif ...
    debug("browse_lib", $r->param("$browse_lib"));
    debug("browse_npl_library", $r->param("browse_npl_library"));
    debug("browse_mysets", $r->param("browse_mysets"));
    debug("browse_setdefs", $r->param("browse_setdefs"));
	##### Asked to browse certain problems
	if ($browse_lib ne '') {
		$browse_which = $browse_lib;
		$self->{current_library_set} = "";
		$use_previous_problems = 0; @pg_files = (); ## clear old problems
	} elsif ($r->param('browse_npl_library')) {
		$browse_which = 'browse_npl_library';
		$self->{current_library_set} = "";
		$use_previous_problems = 0; @pg_files = (); ## clear old problems
	} elsif ($r->param('browse_local')) {
		$browse_which = 'browse_local';
		#$self->{current_library_set} = "";
		$use_previous_problems = 0; @pg_files = (); ## clear old problems
	} elsif ($r->param('browse_mysets')) {
		$browse_which = 'browse_mysets';
		$self->{current_library_set} = "";
		$use_previous_problems = 0; @pg_files = (); ## clear old problems
	} elsif ($r->param('browse_setdefs')) {
		$browse_which = 'browse_setdefs';
		$self->{current_library_set} = "";
		$use_previous_problems = 0; @pg_files = (); ## clear old problems

		##### Change the seed value

	} elsif ($r->param('rerandomize')) {
		$self->{problem_seed}= 1+$self->{problem_seed};
		#$r->param('problem_seed', $problem_seed);
		$self->addbadmessage('Changing the problem seed for display, but there are no problems showing.') if $none_shown;

		##### Clear the display

	} elsif ($r->param('cleardisplay')) {
		@pg_files = ();
		$use_previous_problems=0;
		$self->addbadmessage('The display was already cleared.') if $none_shown;

		##### View problems selected from the local list

	} elsif ($r->param('view_local_set')) {

		my $set_to_display = $self->{current_library_set};
		if (not defined($set_to_display) or $set_to_display eq SELECT_LOCAL_STRING or $set_to_display eq "Found no directories containing problems") {
			$self->addbadmessage('You need to select a set to view.');
		} else {
			$set_to_display = '.' if $set_to_display eq MY_PROBLEMS;
			$set_to_display = substr($browse_which,7) if $set_to_display eq MAIN_PROBLEMS;
			@pg_files = list_pg_files($ce->{courseDirs}->{templates},
				"$set_to_display");
			$use_previous_problems=0;
		}

		##### View problems selected from the a set in this course
  } elsif ($r->param('edit_mysets_set')){
  
  my $set_to_display = $self->{current_library_set};
		debug("set_to_display is $set_to_display");
		if (not defined($set_to_display) 
				or $set_to_display eq "Select a Homework Set"
				or $set_to_display eq NO_LOCAL_SET_STRING) {
			$self->addbadmessage("You need to select a set from this course to view.");
		} else {
			# DBFIXME don't use ID list, use an iterator
			my @problemList = $db->listGlobalProblems($set_to_display);
			my $problem;
			@pg_files=();
			for $problem (@problemList) {
				my $problemRecord = $db->getGlobalProblem($set_to_display, $problem); # checked
				die "global $problem for set $set_to_display not found." unless
					$problemRecord;
				push @pg_files, $problemRecord->source_file;

			}
			@pg_files = sortByName(undef,@pg_files);
			$use_previous_problems=0;
		}

		##### View from the library database
 
	} elsif ($r->param('lib_view')) {
 
		@pg_files=();
		my @dbsearch = WeBWorK::Utils::ListingDB::getSectionListings($r);
		my ($result, $tolibpath);
		for $result (@dbsearch) {
			$tolibpath = "Library/$result->{path}/$result->{filename}";
			
			## Too clunky!!!!
			push @pg_files, $tolibpath;
		}
		$use_previous_problems=0; 

		##### View a set from a set*.def

	} elsif ($r->param('view_setdef_set')) {

		my $set_to_display = $self->{current_library_set};
		debug("set_to_display is $set_to_display");
		if (not defined($set_to_display) 
				or $set_to_display eq "Select a Set Definition File"
				or $set_to_display eq NO_LOCAL_SET_STRING) {
			$self->addbadmessage("You need to select a set definition file to view.");
		} else {
			@pg_files= $self->read_set_def($set_to_display);
		}
		$use_previous_problems=0; 

		##### Edit the current local homework set

	} elsif ($r->param('edit_local')) { ## Jump to set edit page

		; # already handled


		##### Make a new local homework set

	} elsif ($r->param('new_local_set')) {
		if ($r->param('new_set_name') !~ /^[\w .-]*$/) {
			$self->addbadmessage("The name ".$r->param('new_set_name')." is not a valid set name.  Use only letters, digits, -, _, and .");
		} else {
			my $newSetName = $r->param('new_set_name');
			# if we want to munge the input set name, do it here
			$newSetName =~ s/\s/_/g;
			debug("local_sets was ", $r->param('local_sets'));
			$r->param('local_sets',$newSetName);  ## use of two parameter param
			debug("new value of local_sets is ", $r->param('local_sets'));
			my $newSetRecord	 = $db->getGlobalSet($newSetName);
			if (defined($newSetRecord)) {
	            $self->addbadmessage("The set name $newSetName is already in use.  
	            Pick a different name if you would like to start a new set.");
			} else {			# Do it!
				# DBFIXME use $db->newGlobalSet
				$newSetRecord = $db->{set}->{record}->new();
				$newSetRecord->set_id($newSetName);
				$newSetRecord->set_header("");
				$newSetRecord->hardcopy_header("");
				$newSetRecord->open_date(time()+60*60*24*7); # in one week
				$newSetRecord->due_date(time()+60*60*24*7*2); # in two weeks
				$newSetRecord->answer_date(time()+60*60*24*7*3); # in three weeks
				eval {$db->addGlobalSet($newSetRecord)};
				if ($@) {
					$self->addbadmessage("Problem creating set $newSetName<br> $@");
				} else {
					$self->addgoodmessage("Set $newSetName has been created.");
					my $selfassign = $r->param('selfassign') || "";
					$selfassign = "" if($selfassign =~ /false/i); # deal with javascript false
					if($selfassign) {
						$self->assignSetToUser($userName, $newSetRecord);
						$self->addgoodmessage("Set $newSetName was assigned to $userName.");
					}
				}
			}
		}

		##### Add selected problems to the current local set

	} elsif ($r->param('update')) {
		## first handle problems to be added before we hide them
		my($localSet, @selected);

		@pg_files = grep {(($_->[1] & ADDED) | ($_->[1] & DELETED)) != 0 } @{$self->{past_problems}}; 
		@selected = map {$_->[0]} @pg_files;

		my @action_files = grep {$_->[1] > 0 } @{$self->{past_problems}};
		# There are now good reasons to do an update without selecting anything.
		#if(scalar(@action_files) == 0) {
		#	 $self->addbadmessage('Update requested, but no problems were marked.');
		#}

		if (scalar(@selected)>0) {	# if some are to be added, they need a place to go
			$localSet = $r->param('myset_sets');
			if (not defined($localSet) or 
					$localSet eq SELECT_SET_STRING or 
		            $localSet eq NO_LOCAL_SET_STRING) {
				$self->addbadmessage('You are trying to add problems to something, 
				but you did not select a "Target Set" name as a target.');
			} else {
				my $newSetRecord  = $db->getGlobalSet($localSet);
				if (not defined($newSetRecord)) {
					$self->addbadmessage("You are trying to add problems to $localSet, 
					but that set does not seem to exist!  I bet you used your \"Back\" button.");
				} else {
					my $addcount = add_selected($self, $db, $localSet);
					if($addcount > 0) {
						$self->addgoodmessage("Added $addcount problem".(($addcount>1)?'s':'').
							" to $localSet.");
					}
				}
			}
		}
		## now handle problems to be hidden

		## only keep the ones which are not hidden
		@pg_files = grep {($_->[1] & HIDDEN) ==0 } @{$self->{past_problems}};
		@past_marks = map {$_->[1]} @pg_files;
		@pg_files = map {$_->[0]} @pg_files;
		@all_past_list = (@all_past_list[0..($first_shown-1)],
					@pg_files,
					@all_past_list[($last_shown+1)..(scalar(@all_past_list)-1)]);
		$last_shown = $first_shown+$maxShown -1; debug("last_shown 3: ", $last_shown);
		$last_shown = (scalar(@all_past_list)-1) if($last_shown>=scalar(@all_past_list)); debug("last_shown 4: ", $last_shown);

	} elsif ($r->param('next_page')) {
		$first_shown = $last_shown+1;
		$last_shown = $first_shown+$maxShown-1; debug("last_shown 5: ", $last_shown);
		$last_shown = (scalar(@all_past_list)-1) if($last_shown>=scalar(@all_past_list)); debug("last_shown 6: ", $last_shown);
		@past_marks = ();
	} elsif ($r->param('prev_page')) {
		$last_shown = $first_shown-1; 
		$first_shown = $last_shown - $maxShown+1;

		$first_shown = 0 if($first_shown<0);
		@past_marks = ();

	} elsif ($r->param('select_all')) {
		@past_marks = map {1} @past_marks;
	} elsif ($r->param('library_basic')) {
		$library_basic = 1;
		for my $jj (qw(textchapter textsection textbook)) {
			$r->param('library_'.$jj,'');
		}
	} elsif ($r->param('library_advanced')) {
		$library_basic = 2;
	} elsif ($r->param('library_reset')) {
		for my $jj (qw(chapters sections subjects textbook keywords)) {
			$r->param('library_'.$jj,'');
		}
	} elsif ($r->param('select_none')) {
		@past_marks = ();
	} else {
		#nothing
	}				##### end of the if elsif ...

  my $default_set = $self->{current_myset_set};
	  #debug("set_to_display is $default_set");
	  if (not defined($default_set) 
  		or $default_set eq "Select a Homework Set"
  		or $default_set eq NO_LOCAL_SET_STRING) {
  		$self->addbadmessage("You need to select a set from this course to view.");
  	} else {
  		# DBFIXME don't use ID list, use an iterator
  		my @problemList = $db->listGlobalProblems($default_set);
  		my $problem;
  		@myset_files=();
  		for $problem (@problemList) {
  			my $problemRecord = $db->getGlobalProblem($default_set, $problem); # checked
  			die "global $problem for set $default_set not found." unless
  				$problemRecord;
  			push @myset_files, $problemRecord->source_file;
  
  		}
  	  @myset_files = sortByName(undef,@myset_files);
  		$use_previous_problems=0;
  	}
 
	############# List of local sets

	# DBFIXME sorting in database, please!
	my @all_db_sets = $db->listGlobalSets;
	@all_db_sets = sortByName(undef, @all_db_sets);

	if ($use_previous_problems) {
		@pg_files = @all_past_list;
	} else {
		$first_shown = 0;
		$last_shown = scalar(@pg_files)<$maxShown ? scalar(@pg_files) : $maxShown; 
		$last_shown--;		# to make it an array index
		@past_marks = ();
	}
	############# Now store data in self for retreival by body
	$self->{first_shown} = $first_shown;
	$self->{last_shown} = $last_shown;
	$self->{browse_which} = $browse_which;
	#$self->{problem_seed} = $problem_seed;
	$self->{pg_files} = \@pg_files;
	$self->{myset_files} = \@myset_files;
	$self->{past_marks} = \@past_marks;
	$self->{all_db_sets} = \@all_db_sets;
	$self->{library_basic} = $library_basic;
	debug("past_marks is ", join(" ", @{$self->{past_marks}}));
}


sub title {
	return "Library Browser v2";
}

# hide view options panel since it distracts from SetMaker's built-in view options
sub options {
	return "";
}

sub head {
  print '<script src="/webwork2_files/js/dnd.js"></script>';
  print '<link rel="stylesheet" type="text/css" href="/webwork2_files/css/setmaker2.css" />';
  print '<script>window.addEventListener("load", setup, false);</script>';
  return "";
}

sub body {
	my ($self) = @_;

	my $r = $self->r;
	my $ce = $r->ce;		# course environment
	my $db = $r->db;		# database
	my $j;			# garden variety counter

	my $userName = $r->param('user');

	my $user = $db->getUser($userName); # checked
	die "record for user $userName (real user) does not exist."
		unless defined $user;

	### Check that this is a professor
	my $authz = $r->authz;
	unless ($authz->hasPermissions($userName, "modify_problem_sets")) {
		print "User $userName returned " . 
			$authz->hasPermissions($user, "modify_problem_sets") . 
	" for permission";
		return(CGI::div({class=>'ResultsWithError'},
		CGI::em("You are not authorized to access the Instructor tools.")));
	}

	my $showHints = $r->param('showHints');
	my $showSolutions = $r->param('showSolutions');
	
	##########	Extract information computed in pre_header_initialize

	my $first_shown = $self->{first_shown};
	my $last_shown = $self->{last_shown}; 
	my $browse_which = $self->{browse_which};
	my $problem_seed = $self->{problem_seed}||1234;
	my @pg_files = @{$self->{pg_files}};
	my @myset_files =@{$self->{myset_files}};
	my @all_db_sets = @{$self->{all_db_sets}};

	my @pg_html;
	if ($last_shown >= $first_shown) {
		@pg_html = renderProblems(
			r=> $r,
			user => $user,
			problem_list => [@pg_files[$first_shown..$last_shown]],
			displayMode => $r->param('mydisplayMode'),
			showHints => $showHints,
			showSolutions => $showSolutions,
		);
	}
	my @myset_html;
	my $displayModePlaceholder;
	if (not defined($r->param('mydisplayMode'))){
	  $displayModePlaceholder = "None";
	}
	else{
	  $displayModePlaceholder = $r->param('mydisplayMode');
	}
	if (scalar(@myset_files) >= $first_shown) {
		@myset_html = renderProblems(
			r=> $r,
			user => $user,
			problem_list => [@myset_files[$first_shown..(scalar(@myset_files)-1)]],
			displayMode => $displayModePlaceholder,
			showHints => $showHints,
			showSolutions => $showSolutions,
		);
	}

	my %isInSet;
	my $setName = $r->param("myset_sets");
	if ($setName) {
		# DBFIXME where clause, iterator
		# DBFIXME maybe instead of hashing here, query when checking source files?
		# DBFIXME definitely don't need to be making full record objects
		# DBFIXME SELECT source_file FROM whatever_problem WHERE set_id=? GROUP BY source_file ORDER BY NULL;
		# DBFIXME (and stick result directly into hash)
		foreach my $problem ($db->listGlobalProblems($setName)) {
			my $problemRecord = $db->getGlobalProblem($setName, $problem);
			$isInSet{$problemRecord->source_file} = 1;
		}
	}
	$self->{isInSet} = \%isInSet;
  my $jj;
	##########	Top part
	print '<div id="editor-form">';
	
	print CGI::start_form({-method=>"POST", -action=>$r->uri, -name=>'mainform'}),
		$self->hidden_authen_fields;
			print '<div id="mysets">';
	#########  Table of mysets problems
	$self->make_mysets_row('all_db_sets'=>\@all_db_sets);
	print '<div class="problemList">';
	  for ($jj=0; $jj<scalar(@myset_html); $jj++) { 
		  $myset_files[$jj] =~ s|^$ce->{courseDirs}->{templates}/?||;
		  $self->make_myset_data_row($myset_files[$jj+$first_shown], $myset_html[$jj], $jj+1, $self->{past_marks}->[$jj]); 
	  }
	print '</div>';
	#print CGI::end_table();
	print '</div>';
	
	print '<div id="setmaker_library">';
	#CGI::start_table({-id=>'setmaker_table', -border=>2});
	$self->make_top_row('all_db_sets'=>\@all_db_sets, 
				 'browse_which'=> $browse_which);
	
	print CGI::hidden(-name=>'browse_which', -value=>$browse_which,-override=>1),
		CGI::hidden(-name=>'problem_seed', -value=>$problem_seed, -override=>1);
	for ($j = 0 ; $j < scalar(@pg_files) ; $j++) {
		print CGI::hidden(-name=>"all_past_list$j", -value=>$pg_files[$j],-override=>1);
	}

	print CGI::hidden(-name=>'first_shown', -value=>$first_shown,-override=>1);
	
	print CGI::hidden(-name=>'last_shown', -value=>$last_shown, -override=>1);

  print '<div class="problemList">';
	########## Now print problems
	for ($jj=0; $jj<scalar(@pg_html); $jj++) { 
		$pg_files[$jj] =~ s|^$ce->{courseDirs}->{templates}/?||;
		$self->make_data_row($pg_files[$jj+$first_shown], $pg_html[$jj], $jj+1, $self->{past_marks}->[$jj]); 
		#$self->make_data_row($pg_files[$jj+$first_shown], $pg_html[$jj], $jj+1, $self->{past_marks}->[$jj+$first_shown]); #MEG
	}
  print '</div>';
	########## Finish things off
	#print CGI::end_table();
	my ($next_button, $prev_button) = ("", "");
	if ($first_shown > 0) {
		$prev_button = CGI::submit(-name=>"prev_page", -style=>"width:15ex",
						 -value=>"Previous page");
	}
	if ((1+$last_shown)<scalar(@pg_files)) {
		$next_button = CGI::submit(-name=>"next_page", -style=>"width:15ex",
						 -value=>"Next page");
	}
	if (scalar(@pg_files)>0) {
		print CGI::p(($first_shown+1)."-".($last_shown+1)." of ".scalar(@pg_files).
			" shown.", $prev_button, " ", $next_button,
			CGI::submit(-name=>"update", -style=>"width:15ex; font-weight:bold",
					-value=>"Update Set"));
	}
	#close library_set
	print '</div>';
	#close form-editor
	print '</div>';
	
	print '<div style="clear:both;"></div>';
	
	
	#	 if($first_shown>0 or (1+$last_shown)<scalar(@pg_files)) {
	
	#	 }
	print CGI::endform(), "\n";

	return "";	
}

=head1 AUTHOR

Written by John Jones, jj (at) asu.edu.
Edited by David Gage

=cut

1;