# Copyright 2002-2007 Interchange Development Group and others
# 
# This program 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.  See the LICENSE file for details.

UserTag banner              Order        category
UserTag banner              addAttr
UserTag banner              PosNumber    1
UserTag banner              Version      1.6
UserTag banner              Routine      <<EOR
sub {
	my ($place, $opt) = @_;


	sub initialize_banner_directory {
		my ($dir, $category, $opt) = @_;
		mkdir $dir, 0777 if ! -d $dir;
		my $t = $opt->{table} || 'banner';
		my $c_field;
		my $append = '';
		if($category) {
			$append = ' AND ';
			$append .= ($opt->{c_field} || 'category');
			$category =~ s/'/''/g;
			$append .= " = '$category'";
		}
		my $db = database_exists_ref($t);
		if(! $db) {
			my $weight_file = "$dir/total_weight";
			return undef if -f $weight_file;
			$t = "no banners db $t\n";
			Vend::Util::writefile( $weight_file, $t, $opt);
			::logError($t);
			return undef;
		}
		my $w_field = $opt->{w_field} || 'weight';
		my $b_field = $opt->{b_field} || 'banner';
		my $q = "select $w_field, $b_field from $t where $w_field >= 1$append";
		my $banners = $db->query({
			query => $q,
			st => 'db',
		});
		my $i = 0;
		for(@$banners) {
			my ($weight, $text) = @$_;
			for(1 .. $weight) {
				Vend::Util::writefile(">$dir/$i", $text, $opt);
				$i++;
			}
		}
		Vend::Util::writefile(">$dir/total_weight", $i, $opt);
	}


	sub tag_weighted_banner {
		my ($category, $opt) = @_;
		my $dir = catfile($Vend::Cfg->{ScratchDir}, 'Banners');
		mkdir $dir, 0777 if ! -d $dir;
		if($category) {
			my $c = $category;
			$c =~ s/\W//g;
			$dir .= "/$c";
		}
		my $statfile = $Vend::Cfg->{ConfDir};
		$statfile .= "/status.$Vend::Cat";
		my $start_time;
		if($opt->{once}) {
			$start_time = 0;
		}
		elsif(! -f $statfile) {
			Vend::Util::writefile( $statfile, "banners initialized " . time() . "\n");
			$start_time = time();
		}
		else {
			$start_time = (stat(_))[9];
		}
		my $weight_file = "$dir/total_weight";
		initialize_banner_directory($dir, $category, $opt)
			if  ( ! -f $weight_file  or  (stat(_))[9] < $start_time );
		my $n = int( rand( readfile($weight_file) ) );
		return Vend::Util::readfile("$dir/$n");
	}
	return tag_weighted_banner($place, $opt) if $opt->{weighted};

	my $table = $opt->{table}     || 'banner';
	my $r_field = $opt->{r_field} || 'rotate';
	my $b_field = $opt->{b_field} || 'banner';
	my $sep  = $opt->{separator}  || ':';
	my $delim = $opt->{delimiter} || "{or}";
	$place = 'default' if ! $place;
	my $totrot;
	do {
		my $banner_data;
		$totrot = tag_data($table, $r_field, $place);
		if(! length $totrot) {
			# No banner present
			unless ($place =~ /$sep/ or $place eq 'default') {
				$place = 'default';
				redo;
			}
		}
		elsif ($totrot) {
			my $current = $::Scratch->{"rotate_$place"}++ || 0;
			my $data = tag_data($table, $b_field, $place);
			my(@banners) = split /\Q$delim/, $data;
			return '' unless @banners;
			return $banners[$current % scalar(@banners)];
		}
		else {
			return tag_data($table, $b_field, $place);
		}
	} while $place =~ s/(.*)$sep.*/$1/;
	return;
}
EOR