#!/usr/bin/perl
# The LearningOnline Network
# searchcat.pl "Search Catalog" batch script

# 04/14/2001 Scott Harrison

# This script goes through a LON-CAPA resource
# directory and gathers metadata.
# The metadata is entered into a SQL database.

use strict;

use IO::File;
use HTML::TokeParser;

my @metalist;
# ----------------- Code to enable 'find' subroutine listing of the .meta files
require "find.pl";
sub wanted {
    (($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_)) &&
    -f _ &&
    /^.*\.meta$/ &&
    push(@metalist,"$dir/$_");
}

# ------------------------------------ Read httpd access.conf and get variables
open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";

while ($configline=<CONFIG>) {
    if ($configline =~ /PerlSetVar/) {
	my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
        chomp($varvalue);
        $perlvar{$varname}=$varvalue;
    }
}
close(CONFIG);

# ------------------------------------- Make sure that database can be accessed
{
    my $dbh;
    unless (
	    $dbh = DBI->connect("DBI:mysql:loncapa","www",$perlvar{'lonSqlAccess'},{ RaiseError =>0,PrintError=>0})
	    ) { 
	print "Cannot connect to database!\n";
	exit;
    }
}

# ------------------------------------------------------------- get .meta files
# need to actually loop over existing users here.. will fix soon
&find("$perlvar{'lonDocRoot'}/res");

# -- process each file to get metadata and put into search catalog SQL database
foreach my $m (@metalist) {
    my $ref=&metadata($m);
    my $sth=$dbh->prepare('insert into metadata values ('.
			  delete($ref->{'title'}),
			  delete($ref->{'author'}).','.
			  delete($ref->{'subject'}).','.
			  delete($ref->{'url'}).','.
			  delete($ref->{'keywords'}).','.
			  delete($ref->{'version'}).','.
			  delete($ref->{'notes'}).','.
			  delete($ref->{'abstract'}).','.
			  delete($ref->{'mime'}).','.
			  delete($ref->{'language'}).','.
			  delete($ref->{'creationdate'}).','.
			  delete($ref->{'lastrevisiondate'}).','.
			  delete($ref->{'owner'}).','.
			  delete($ref->{'copyright'}).
			  ')';
    $sth->execute();
}

# ----------------------------------------------------------- Clean up database
# Need to, perhaps, remove stale SQL database records.
# ... not yet implemented

# --------------------------------------------------- Close database connection
$dbh->disconnect;

# ---------------------------------------------------------------- Get metadata
# significantly altered from subroutine present in lonnet
sub metadata {
    my ($uri,$what)=@_;
    my %metacache;
    $uri=&declutter($uri);
    my $filename=$uri;
    $uri=~s/\.meta$//;
    $uri='';
    unless ($metacache{$uri.'keys'}) {
        unless ($filename=~/\.meta$/) { $filename.='.meta'; }
	my $metastring=&getfile($perlvar{'lonDocRoot'}.'/res/'.$filename);
        my $parser=HTML::TokeParser->new(\$metastring);
        my $token;
        while ($token=$parser->get_token) {
           if ($token->[0] eq 'S') {
	      my $entry=$token->[1];
              my $unikey=$entry;
              if (defined($token->[2]->{'part'})) { 
                 $unikey.='_'.$token->[2]->{'part'}; 
	      }
              if (defined($token->[2]->{'name'})) { 
                 $unikey.='_'.$token->[2]->{'name'}; 
	      }
              if ($metacache{$uri.'keys'}) {
                 $metacache{$uri.'keys'}.=','.$unikey;
              } else {
                 $metacache{$uri.'keys'}=$unikey;
	      }
              map {
		  $metacache{$uri.''.$unikey.'.'.$_}=$token->[2]->{$_};
              } @{$token->[3]};
              unless (
                 $metacache{$uri.''.$unikey}=$parser->get_text('/'.$entry)
		      ) { $metacache{$uri.''.$unikey}=
			      $metacache{$uri.''.$unikey.'.default'};
		      }
          }
       }
    }
    return \%metacache;
}

# ------------------------------------------------------------ Serves up a file
# returns either the contents of the file or a -1
sub getfile {
  my $file=shift;
  if (! -e $file ) { return -1; };
  my $fh=IO::File->new($file);
  my $a='';
  while (<$fh>) { $a .=$_; }
  return $a
}

# ------------------------------------------------------------- Declutters URLs
sub declutter {
    my $thisfn=shift;
    $thisfn=~s/^$perlvar{'lonDocRoot'}//;
    $thisfn=~s/^\///;
    $thisfn=~s/^res\///;
    return $thisfn;
}