#!/usr/local/bin/perl

require "common.pl";

$webmaster = "Shishir Gundavaram (shishir\@bu\.edu)";
$fgrep = "/usr/local/bin/fgrep";
$document_root = $ENV{'DOCUMENT_ROOT'};

&parse_form_data (*SEARCH);
$query = $SEARCH{'query'};

if ($query eq "") {
    &return_error (500, "Search Error", "Please enter a search query.");
} elsif ($query !~ /^(\w+)$/) {
    &return_error (500, "Search Error", "Invalid characters in query.");
} else {
    print "Content-type: text/html", "\n\n";
    print "<HTML>", "\n";
    print "<HEAD><TITLE>Search Results</TITLE></HEAD>";
    print "<BODY>", "\n";
    print "<H1>Results of searching for: ", $query, "</H1>";
    print "<HR>";

    open (SEARCH, "$fgrep -A2 -B2 -i -n -s $query $document_root/* |");

    $count = 0;
    $matches = 0;
    %accessed_files = ();

    while (<SEARCH>) {
        if ( ($file, $type, $line) = m|^(/\S+)([\-:])\d+\2(.*)| ) {

            unless ($count) {
                if ( defined ($accessed_files{$file}) ) {
                    next;
                } else {
                    $accessed_files{$file} = 1;
                }

                $file =~ s/^$document_root\/(.*)/$1/;
                $matches++;

                print qq|<A HREF="/$file">$file</A><BR><BR>|;
            }

            $count++;
            $line =~ s/<(([^>]|\n)*)>/&lt;$1&gt;/g;
    
            if ($line =~ /^[^A-Za-z0-9]*$/) {
                next;
            }

            if ($type eq ":") {
                $line =~ s/($query)/<B>$1<\/B>/ig;
            }

            print $line, "<BR>";

        } else {
            if ($count) {
                print "<HR>";
                $count = 0;
            }
        }
    }
    
    print "<P>", "<HR>";
    print "Total number of files searched: ", $matches, "<BR>";
    print "<HR>";
    print "</BODY></HTML>", "\n";

    close (SEARCH);
}

exit (0);