package LONCAPA::batchcreatecourse;
use LONCAPA::Configuration;
use LONCAPA::Enrollment;
use HTML::Parser;
use Time::Local;
use Apache::Constants; 
use Apache::lonnet;
use Apache::loncommon;
use Apache::loncreatecourse;
use Apache::loncreateuser;
use Apache::lonlocal;

# Collection of routines used for batch creation of courses and users.
# &create_courses() should be called by an Autocreate.pl
# script via a cron entry, or alternatively from a web page, after upload 
# of a file containing an XML description of a course request (lonbatchccrs.pm).
# 
# XML file(s) describing courses that are to be created in domain $dom are stored in
# /home/httpd/perl/tmp/addcourse/$dom. Each XML file is deleted after it has been
# parsed.
#
# &create_courses() will create an account for the course owner 
# (if one does not currently exist), will create the course (cloning if necessary),
# and will add additional instructional staff (creating accounts if necessary).
#
# Example of XML file (which could contain more than one class to be created):
#
#<?xml version="1.0" encoding="UTF-8"?>
#<!DOCTYPE text>
#<class id="ss05ubw101">
# <title>Underwater Basket Weaving</title>
# <coursecode>ss05ubw101</coursecode>
# <coursehome>msul1</coursehome>
# <coursedomain>msu</coursedomain>
# <reshome>/res/msu/</reshome>
# <optional_id></optional_id>
# <adds>1</adds>
# <drops>1</drops>
# <enrollstart>2005:01:04:10:30</enrollstart>
# <enrollend>2005:07:04:20:30</enrollend>
# <accessstart>2005:01:10:10:30</accessstart>
# <accessend>2005:05:31:10:30</accessend>
# <authentication>
#  <method>krb4</method>
#  <param>MSU.EDU</param>
# </authentication>
# <nonstandard></nonstandard>
# <topmap></topmap>
# <firstres>nav</firstres>
# <clonecrs>466011437c34194msul1</clonecrs>
# <clonedom>msu</clonedom>
# <showphotos></showphotos>
# <setpolicy>1</setpolicy>
# <setcontent>1</setcontent>
# <setkeys>0</setkeys>
# <keyauth>keyadmin@msu</keyauth>
# <disresdis>1</disresdis>
# <disablechat>1</disablechat>
# <openall></openall>
# <notify_dc>1</notify_dc>
# <notify_owner>1</notify_owner>
# <owner>
#  <username>sparty</username>
#  <domain>msu</domain>
#  <authtype>krb4</authtype>
#  <autharg>MSU.EDU</autharg>
# </owner>
# <sections>
#  <section>
#   <inst>001</inst>
#   <loncapa>1</loncapa>
#  </section>
#  <section>
#   <inst>002</inst>
#   <loncapa>2</loncapa>
#  </section>
# </sections>
# <crosslists>
#  <xlist>
#   <inst>ss05zzz101001</inst>
#   <loncapa>1</loncapa>
#  </xlist>
# </crosslists>
# <users>
#  <user>
#   <username>sparty</username>
#   <domain>msu</domain>
#   <email>sparty@msu.edu</email>
#   <authtype>krb4</authtype>
#   <autharg></autharg>
#   <firstname>MSU</firstname>
#   <generation></generation>
#   <lastname>Spartan</lastname>x
#   <middlename></middlename>
#   <studentID></studentID>
#   <roles></roles>
#  </user>
#  <user>
#   <username>itds0001</username>
#   <domain>northwood5</domain>
#   <email>itds0001@msu.edu</email>
#   <authtype>int</authtype>
#   <autharg></autharg>
#   <firstname>Info</firstname>
#   <generation></generation>
#   <lastname>Techc</lastname>x
#   <middlename></middlename>
#   <studentID></studentID>
#   <roles>
#    <role id='in'>
#     <start>2005:01:01:12:10</start>
#     <end>2005:12:01:12:10</end>
#     <usec>1</usec>
#     <usec>2</usec>
#    </role>
#   </roles>
#  </user>
# </users>
#</class>
#
# Many of these are binary options (corresponding to either checkboxes or
# radio buttons in the interactive CCRS page).  Examples include:
# setpolicy, setcontent, setkeys, disableresdis, disablechat, openall
#
# A value of 1 between opening and closing tags is equivalent to a 
# checked checkbox or 'Yes' response in the original CCRS web page.
# A value of 0 or blank is equivalent to an unchecked box or 'No'
# response. Dates are in format YYYY:MM:DD:HH:MM:SS (:separators required)
#
# firstres can be nav, syl , or blank for "Navigate Contents", Syllabus, or
# no entry respectively.
# For format of other parameters, refer to the interactive CCRS page
# and view how the equivalent parameter is displayed in the web form.  
#  
##############################################################
# create_courses() - creates courses described in @$requests,
#                    files listed in @$requests are deleted
#                    after the files have been parsed.
#
#                    Directory searched for files listed in @$requests
#                    is /home/httpd/perl/tmp/addcourse/$dom/auto if $context is auto
#                    and /home/httpd/perl/tmp/addcourse/$dom/web/$uname if $context is web
#                    
# inputs (five)  -  requests - ref to array of filename(s) containing course requests 
#                   courseids - ref to hash to store LON-CAPA course ids of new courses 
#                   context - auto if called from command line, web if called from browser
#                   dom - domain for which the course is being created
#                   uname - username of DC who is requesting course creation from browser
#  
# outputs (three)  -  output - text recording user roles added etc.
#                     logmsg - text to be logged
#                     keysmsg - text containing link(s) to manage keys page(s) 
#############################################################

sub create_courses {
    my ($requests,$courseids,$context,$dom,$uname) = @_;
    my $output;
    my $perlvarref = LONCAPA::Configuration::read_conf('loncapa.conf');
# Get role names
    my %longroles = ();
    open(FILE,"<$perlvarref{'lonTabDir'}.'/rolesplain.tab");
    my @rolesplain = <FILE>;
    close(FILE);
    foreach (@rolesplain) {
        if ($_ =~ /^(st|ta|ex|ad|in|cc):([\w\s]+)$/) {
            $longroles{$1} = $2;
        }
    }
    my ($logmsg,$keysmsg,$newusermsg,$addresult);
    my %enrollcount = ();
    my $newcoursedir = $$perlvarref{'lonDaemons'}.'/tmp/addcourse/'.$dom.'/'.$context;
    if ($uname) {
        unless ($context eq 'auto') {
            $newcoursedir .= '/'.$uname;
        }
    }
    if (@{$requests} > 0) {
        foreach my $request (@{$requests}) {
            my %details = ();
            if (-e $newcoursedir.'/'.$request) {
                &parse_coursereqs($newcoursedir.'/'.$request, \%details);
                foreach my $num (sort keys %details) {
                    my $courseid = &build_course($dom,$num,$context,\%details,\%longroles,\$logmsg,\$newusermsg,\$addresult,\%enrollcount,\$output,\$keysmsg);
                    $$courseids{$courseid} = $enrollcount;
                }
            }
        }
    }
    return ($output,$logmsg,$keysmsg);
}

#############################################################
#
# parse_coursereqs() 
# inputs (two) - coursefile - path to XML file containing course(s) to be created.
#              - details - reference to hash containing extracted information.
# outputs (none)
#
############################################################

sub parse_coursereqs {
    my ($coursefile,$details) = @_;
#   Note all start and end dates should be in this format:
#   YYYY:MM:DD:HH:MM:SS (:separators required).
    my $uname = '';
    my @state = ();
    my $num = 0;
    my $secid = 0;
    my $xlist = 0;
    my $userkey = '';
    my $role = '';
    my @items = ('title','optional_id','coursecode','coursehome','reshome','nonstandard','adds','drops','topmap','firstres','clonecrs','clonedom','showphotos','setpolicy','setcontent','setkeys','keyauth','disresdis','disablechat','openall','notify_owner','notify_dc');
    my @dateitems = ('enrollstart','enrollend','accessstart','accessend');
    my @useritems = ('autharg','authtype','firstname','generation','lastname','middlename','studentID');
    my $p = HTML::Parser->new
    (
        xml_mode => 1,
        start_h =>
            [sub {
                 my ($tagname, $attr) = @_;
                 push(@state, $tagname);
                 if ("@state" eq "class") {
                     %{$$details{$num}} = ();
                     $$details{$num}{'class'} = $attr->{id};
                     %{$$details{$num}{'users'}} = ();
                     %{$$details{$num}{'sections'}} = ();
                     $secid = 0;
                     $xlist = 0;
                 }
                 if ("@state" eq "class users user roles role") {
                     $role = $attr->{id};
                     if ($role =~ /^(st|ad|ep|ta|in|cc)$/) {
                         push(@{$$details{$num}{'users'}{$userkey}{'roles'}}, $role);  
                         %{$$details{$num}{'users'}{$userkey}{$role}} = ();
                         @{$$details{$num}{'users'}{$userkey}{$role}{'usec'}} = ();
                     }
                 }
                 if ("@state" eq "class sections section") {
                     $secid ++;
                     %{$$details{$num}{'sections'}{$secid}} = ();
                 }
                 if ("@state" eq "class crosslists xlist") {
                     $xlist ++;
                     %{$$details{$num}{'crosslists'}{$xlist}} = ();
                 }
            }, "tagname, attr"],
         text_h =>
             [sub {
                 my ($text) = @_;
                 if ("@state" eq "class owner username") {
                     $$details{$num}{'owner'} = $text;
                 } elsif ("@state" eq "class owner domain") {
                    $$details{$num}{'domain'} = $text;
                 } elsif ("@state" eq "class sections section inst") {
                    $$details{$num}{'sections'}{$secid}{'inst'} = $text;
                 } elsif ("@state" eq "class sections section loncapa") {
                    $$details{$num}{'sections'}{$secid}{'loncapa'} = $text;
                 } elsif ("@state" eq "class crosslists xlist inst") {
                    $$details{$num}{'crosslists'}{$xlist}{'inst'} = $text;
                 } elsif ("@state" eq "class crosslists xlist loncapa") {
                    $$details{$num}{'crosslists'}{$xlist}{'loncapa'} = $text;
                 } elsif ("@state" eq "class owner authtype") {
                    $$details{$num}{'ownerauthtype'} = $text;
                 } elsif ("@state" eq "class owner autharg") {
                    $$details{$num}{'ownerautharg'} = $text;
                 } elsif ("@state" eq "class authentication method") {
                    $$details{$num}{'authtype'} = $text;
                 } elsif ("@state" eq "class authentication param") {
                    $$details{$num}{'authparam'} = $text;
                 } elsif ("@state" eq "class users user username") {
                    $userkey = $text;
                 } elsif ("@state" eq "class users user domain") {
                    $userkey .= ':'.$text;
                    %{$$details{$num}{'users'}{$userkey}} = ();
                    @{$$details{$num}{'users'}{$userkey}{'roles'}} = ();
                 } elsif ("@state" eq "class users user email") {
                    $$details{$num}{'users'}{$userkey}{'emailaddr'} = $text;
                    $$details{$num}{'users'}{$userkey}{'emailenc'} = &Apache::lonnet::escape($text); 
                 } elsif ("@state" eq "class users user roles role start") {
                     if ($role =~ /^(st|ad|ep|ta|in|cc)$/) {
                         $$details{$num}{'users'}{$userkey}{$role}{'start'} = &process_date($text);
                     }
                 } elsif ("@state" eq "class users user roles role end") {
                     if ($role =~ /^(st|ad|ep|ta|in|cc)$/) {
                         $$details{$num}{'users'}{$userkey}{$role}{'end'} = &process_date($text);
                     }
                 } elsif ("@state" eq "class users user roles role usec") {
                     if ($role =~ /^(st|ad|ep|ta|in|cc)$/) {
                         unless ($text eq '') {
                             push(@{$$details{$num}{'users'}{$userkey}{$role}{'usec'}},$text);
                         }
                     }
                 } else {
                     foreach my $item (@items) {
                         if ("@state" eq "class $item") {
                             $$details{$num}{$item} = $text;
                         }
                     }
                     foreach my $item (@dateitems) {
                         if ("@state" eq "class $item") {
                             $$details{$num}{$item} = &process_date($text);
                         }
                     }
                     foreach my $item (@useritems) {
                         if ("@state" eq "class users user $item") {
                             $$details{$num}{'users'}{$userkey}{$item} = $text;
                         }
                     }
                 }
               }, "dtext"],
         end_h =>
               [sub {
                   my ($tagname) = @_;
                   if ("@state" eq "class") {
                       $num ++;
                   }
                   pop @state;
                }, "tagname"],
    );

    $p->parse_file($coursefile);
    $p->eof;
    if (-e "$coursefile") {
#        unlink $coursefile;
    }
    return;
}

#########################################################
#
# build_course() 
#
# inputs
#   domain
#   course request number
#   context - auto if called from command line, web if called from DC web interface
#   ref to hash of course creation information
#   ref to hash of role descriptions
#   ref to scalar used to accumulate log messages
#   ref to scalar used to accumulate messages sent to new users
#   ref to scalar used to accumulate results of new user additions
#   ref to hash of enrollment counts for different roles
#   ref to scalar used to accumulate iformation about added roles
#   ref to scalar used to accumulate 
#
# outputs
#   LON-CAPA courseID for new (created) course
#
#########################################################

sub build_course {
    my ($cdom,$num,$context,$details,$longoles,$logmsg,$newusermsg,$addresult,$enrollcount,$output,$keysmsg) = @_;
    my $owner_uname = $$details{$num}{'owner'};
    my $owner_domain = $$details{$num}{'domain'};
    my $owner = $owner_uname.':'.$owner_domain;
    my $sectionstr = '';
    my $xliststr = '';
    my $noenddate = '';
    my $outcome;
    my ($courseid,$crsudom,$crsunum);
    my $linefeed;
    if ($context eq 'auto') {
        $linefeed = "\n";
    } else {
        $linefeed = "<br />\n";
    }
    if ($$details{$num}{'accessend'} eq '') {
        $noenddate = 1;
    }
    my $reshome = $$details{$num}{'reshome'};
    if ($reshome eq '') {
        $reshome = '/res/'.$cdom;
    }
    my $firstres =  $$details{$num}{'firstres'};
    if ($firstres eq '') {
        $firstres = 'syl';
    }
    foreach my $secid (sort keys %{$$details{$num}{'sections'}}) {
        $sectionstr .= $$details{$num}{'sections'}{$secid}{'inst'}.':'.$$details{$num}{'sections'}{$secid}{'loncapa'};
    }

    foreach my $xlist (sort keys %{$$details{$num}{'crosslists'}}) {
        $xliststr .= $$details{$num}{'crosslists'}{$xlist}{'inst'}.':'.$$details{$num}{'crosslists'}{$xlist}{'loncapa'};
    }

    my %courseinfo = (
                      inst_code => $$details{$num}{'coursecode'},
                      description => $$details{$num}{'title'}
                     ); 
    if (&Apache::lonnet::homeserver($$details{$num}{'owner'},$$details{$num}{'domain'}) eq 'no_host') { # Add user if no account
        my $ownerargs = ('auth' => $$details{$num}{'ownerauthtype'},
                    'authparam' => $$details{$num}{'ownerauthparam'},
                    'emailenc' => $$details{$num}{'emailenc'},
                    'dom' => $$details{$num}{'domain'},
                    'uname' => $$details{$num}{'owner'},
                    'pid' => '',
                    'first' => $$details{$num}{'users'}{$owner}{'first'},
                    'middle' => $$details{$num}{'users'}{$owner}{'middle'},
                    'last' => $$details{$num}{'users'}{$owner}{'last'},
                    'gene' => $$details{$num}{'users'}{$owner}{'gene'},
                    'usec' => '',
                    'end' => '',
                    'start' => '',
                    'emailaddr' => $$details{$num}{'users'}{$owner}{'email'},
                    'cid' => '',
                    'context' => 'createowner',
                    'linefeed' => $linefeed,
                    'role' => 'cc'
                   );
        $outcome = &LONCAPA::Enrollment::create_newuser($ownerargs,$logmsg,$newusermsg,$enrollcount,$addresult,$longroles,$courseinfo);
    } else {
        $outcome = 'ok';
    }

    my $courseargs = {
               ccuname => $$details{$num}{'owner'},
               ccdomain => $$details{$num}{'domain'},
               cdescr => $$details{$num}{'title'},
               curl => $$details{$num}{'topmap'},
               course_domain => $cdom,
               course_home =>  $$details{$num}{'coursehome'},
               nonstandard => $$details{$num}{'nonstandard'},
               crscode => $$details{$num}{'coursecode'},
               clonecourse => $$details{$num}{'clonecrs'},
               clonedomain => $$details{$num}{'clonedom'},
               crsid => $$details{$num}{'optional_id'},
               curruser => $$details{$num}{'owner'},
               crssections => $sectionstr,
               crsxlist => $xliststr,
               autoadds => $$details{$num}{'adds'},
               autodrops => $$details{$num}{'drops'},
               notify => $$details{$num}{'notify_owner'},
               notify_dc => $$details{$num}{'notify_dc'},
               no_end_date => $noenddate,
               showphotos => $$details{$num}{'showphotos'},
               authtype => $$details{$num}{'authtype'},
               autharg => $$details{$num}{'authparam'},
               enrollstart => $$details{$num}{'enrollstart'},
               enrollend => $$details{$num}{'enrollend'},
               startaccess => $$details{$num}{'accessstart'},
               endaccess => $$details{$num}{'accessend'},
               setpolicy => $Sdetails{$num}{'setpolicy'},
               setcontent => $$details{$num}{'setcontent'},
               reshome => $reshome,
               setkeys => $$details{$num}{'setkeys'},
               keyauth => $$details{$num}{'keyauth'},
               disresdis => $$details{$num}{'disresdis'},
               disablechat => $$details{$num}{'disablechat'},
               openall => $$details{$num}{'openall'},
               firstres => $firstres
               };

    if ($outcome eq 'ok') {
        my %host_servers = &Apache::loncommon::get_library_servers($cdom);
        if (! exists($host_servers{$$details{$num}{'coursehome'}})) {
            $$logmsg .= &mt('Invalid home server for course').': '.$$details{$num}{'coursehome'};
            return;
        }

        &Apache::loncreatecourse::construct_course($courseargs,$logmsg,\$courseid,\$crsudom,\$crsunum);
    } else {
        return;
    }
    
#
# Make owner a course coordinator
#
    if (($owner_domain) && ($owner_uname)) {
        &Apache::lonnet::assignrole($owner_domain,$owner_uname,$courseid,'cc');
    }

#
# Process other reqested users
#
    my $stulogmsg = '';
    foreach my $userkey (sort keys %{$$details{$num}{'users'}}) {
        my $url = '/'.$crsudom.'/'.$crsunum;
        if (@{$$details{$num}{'users'}{$userkey}{'roles'}} > 0) {
            my ($username,$userdom) = split/:/,$userkey;
            if (&Apache::lonnet::homeserver($username,$userdom) eq 'no_host') { # Add user if no account
                my $firstrole = $$details{$num}{'users'}{$userkey}{'roles'}[0];
                my $firssec = $$details{$num}{'users'}{$userkey}{$firstrole}{'usec'}[0];
                my $userargs = ('auth' => $$details{$num}{'users'}{$userkey}{'authtype'},
                    'authparam' => $$details{$num}{'users'}{$userkey}{'authparam'},
                    'emailenc' => $$details{$num}{'users'}{$userkey}{'emailenc'},
                    'dom' => $userdom,
                    'uname' => $username,
                    'pid' => $$details{$num}{'users'}{$userkey}{'studentID'},
                    'first' => $$details{$num}{'users'}{$userkey}{'first'},
                    'middle' => $$details{$num}{'users'}{$userkey}{'middle'},
                    'last' => $$details{$num}{'users'}{$userkey}{'last'},
                    'gene' => $$details{$num}{'users'}{$userkey}{'gene'},
                    'usec' => $firstsec,
                    'end' => $$details{$num}{'users'}{$userkey}{'end'},
                    'start' => $$details{$num}{'users'}{$userkey}{'start'},
                    'emailaddr' => $$details{$num}{'users'}{$userkey}{'email'},
                    'cid' => $courseid,
                    'context' => 'createcourse',
                    'linefeed' => $linefeed,
                    'role' => $$details{$num}{'users'}{$userkey}{'roles'}[0], 
                   );
                $outcome = &LONCAPA::Enrollment::create_newuser($userargs,$logmsg,$newusermsg,$enrollcount,$addresult,$longroles,$courseinfo);
# now add other roles and other sections.
                if ($outcome eq 'ok') {
                    if (($firstrole ne 'st') && (@{$$details{$num}{'users'}{$userkey}{$firstrole}{'usec'}} > 1)) {
                        for (my $i=1; $i<@{$$details{$num}{'users'}{$userkey}{$firstrole}{'usec'}}; $i++) {
                            my $curr_role = $firstrole;
                            my $start = $$details{$num}{'users'}{$userkey}{$curr_role}{'start'};
                            my $end = $$details{$num}{'users'}{$userkey}{$curr_role}{'end'};
                            my $usec = $$details{$num}{'users'}{$userkey}{$firstrole}{'usec'}[$i];
                            $url = '/'.$crsudom.'/'.$crsunum;
                            if ($usec ne '') {
                                $url .= '/'.$usec;
                            }
                            $$output .= &Apache::loncreateuser::commit_standardrole($userdom,$username,$url,$curr_role,$start,$end,$crsudom,$crsunum,$usec);
                        }
                    }
                    if (@{$$details{$num}{'users'}{$userkey}{'roles'}} > 1) {
                        for (my $j=1; $j<@{$$details{$num}{'users'}{$userkey}{'roles'}}; $j++) {
                            my $curr_role = $$details{$num}{'users'}{$userkey}{'roles'}[$j];
                            my $start = $$details{$num}{'users'}{$userkey}{$curr_role}{'start'};
                            my $end = $$details{$num}{'users'}{$userkey}{$curr_role}{'end'};
                            if ($curr_role eq 'st') {
                                my $usec = $$details{$num}{'users'}{$userkey}{$curr_role}{'usec'}[0];
                                $url = '/'.$crsudom.'/'.$crsunum;
                                if ($usec ne '') {
                                    $url .= '/'.$usec;
                                }
                                $$output .= &Apache::loncreateuser::commit_studentrole(\$stulogmsg,$userdom,$username,$url,$curr_role,$start,$end,$crsudom,$crsunum,$usec);
                            } else {
                                foreach my $usec (@{$$details{$num}{'users'}{$userkey}{$curr_role}{'usec'}}) {
                                    $url = '/'.$crsudom.'/'.$crsunum;
                                    if ($usec ne '') {
                                        $url .= '/'.$usec;
                                    }
                                    $$output .= &Apache::loncreateuser::commit_standardrole($userdom,$username,$url,$curr_role,$start,$end,$crsudom,$crsunum,$usec);
                                }
                            }
                        }
                    }
                }
            } else {
                foreach my $curr_role (@{$$details{$num}{'users'}{$userkey}{'roles'}}) {
                    my $start = $$details{$num}{'users'}{$userkey}{$curr_role}{'start'};
                    my $end = $$details{$num}{'users'}{$userkey}{$curr_role}{'end'};
                    if ($curr_role eq 'st') {
                        my $usec = $$details{$num}{'users'}{$userkey}{$curr_role}{'usec'}[0];
                        $url = '/'.$crsudom.'/'.$crsunum;
                        if ($usec ne '') {
                            $url .= '/'.$usec;
                        }
                        $$output .= &Apache::loncreateuser::commit_studentrole(\$stulogmsg,$userdom,$username,$url,$curr_role,$start,$end,$crsudom,$crsunum,$usec);
                    } else {
                        if (@{$$details{$num}{'users'}{$userkey}{$curr_role}{'usec'}} > 0) {
                            foreach my $usec (@{$$details{$num}{'users'}{$userkey}{$curr_role}{'usec'}}) {
                                $url = '/'.$crsudom.'/'.$crsunum;
                                if ($usec ne '') {
                                    $url .= '/'.$usec;
                                }
                                $$output .= &Apache::loncreateuser::commit_standardrole($userdom,$username,$url,$curr_role,$start,$end,$crsudom,$crsunum,$usec);
                                $url = '/'.$crsudom.'/'.$crsunum;
                                if ($usec ne '') {
                                    $url .= '/'.$usec;
                                }
                            }
                        } else {
                            $$output .= &Apache::loncreateuser::commit_standardrole($userdom,$username,$url,$curr_role,$start,$end,$crsudom,$crsunum,'');
                        }
                    }
                }
            }
        }
    }

# Information about keys.
    if ($$details{$num}{'setkeys'}) {
        $$keysmsg .=
 '<a href="/adm/managekeys?cid='.$crsudom.'_'.$crsunum.'">'.&mt('Manage Access Keys').'</a> for '.$$details{$num}{'title'}.$linefeed;
    }
# Flush the course logs so reverse user roles immediately updated
    &Apache::lonnet::flushcourselogs();
    return $courseid;
}

#########################################################
#
# process_date()
# 
# input - date/time string in format YYYY:MM:DD:HH:MM:SS (:separators required).
# output - corresponding UNIX time (seconds since epoch). 
#
#########################################################

sub process_date {
    my $timestr = shift;
    my $timestamp = '';
    if ($timestr eq "No end date") {
        $timestamp = '';
    } else {
        my @entries = split/:/,$timestr;
        for (my $j=0; $j<@entries; $j++) {
            if ( length($entries[$j]) > 1 ) {
                $entries[$j] =~ s/^0//;
            }
        }
        $entries[1] = $entries[1] - 1;
        $timestamp =  timelocal($entries[5],$entries[4],$entries[3],$entries[2],$entries[1],$entries[0]);
    }
    return $timestamp;
}

1;
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>500 Internal Server Error</title>
</head><body>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error or
misconfiguration and was unable to complete
your request.</p>
<p>Please contact the server administrator at 
 root@localhost to inform them of the time this error occurred,
 and the actions you performed just before this error.</p>
<p>More information about this error may be available
in the server error log.</p>
</body></html>