+=item decrement_upbytes OCTETS
+
+Decrements the I<upbytes> field of this record by the given amount. If there
+is an error, returns the error, otherwise returns false.
+
+=cut
+
+sub decrement_upbytes {
+ shift->_op_usage('-', 'upbytes', @_);
+}
+
+=item increment_upbytes OCTETS
+
+Increments the I<upbytes> field of this record by the given amount. If there
+is an error, returns the error, otherwise returns false.
+
+=cut
+
+sub increment_upbytes {
+ shift->_op_usage('+', 'upbytes', @_);
+}
+
+=item decrement_downbytes OCTETS
+
+Decrements the I<downbytes> field of this record by the given amount. If there
+is an error, returns the error, otherwise returns false.
+
+=cut
+
+sub decrement_downbytes {
+ shift->_op_usage('-', 'downbytes', @_);
+}
+
+=item increment_downbytes OCTETS
+
+Increments the I<downbytes> field of this record by the given amount. If there
+is an error, returns the error, otherwise returns false.
+
+=cut
+
+sub increment_downbytes {
+ shift->_op_usage('+', 'downbytes', @_);
+}
+
+=item decrement_totalbytes OCTETS
+
+Decrements the I<totalbytes> field of this record by the given amount. If there
+is an error, returns the error, otherwise returns false.
+
+=cut
+
+sub decrement_totalbytes {
+ shift->_op_usage('-', 'totalbytes', @_);
+}
+
+=item increment_totalbytes OCTETS
+
+Increments the I<totalbytes> field of this record by the given amount. If there
+is an error, returns the error, otherwise returns false.
+
+=cut
+
+sub increment_totalbytes {
+ shift->_op_usage('+', 'totalbytes', @_);
+}
+
+=item decrement_seconds SECONDS
+
+Decrements the I<seconds> field of this record by the given amount. If there
+is an error, returns the error, otherwise returns false.
+
+=cut
+
+sub decrement_seconds {
+ shift->_op_usage('-', 'seconds', @_);
+}
+
+=item increment_seconds SECONDS
+
+Increments the I<seconds> field of this record by the given amount. If there
+is an error, returns the error, otherwise returns false.
+
+=cut
+
+sub increment_seconds {
+ shift->_op_usage('+', 'seconds', @_);
+}
+
+
+my %op2action = (
+ '-' => 'suspend',
+ '+' => 'unsuspend',
+);
+my %op2condition = (
+ '-' => sub { my($self, $column, $amount) = @_;
+ $self->$column - $amount <= 0;
+ },
+ '+' => sub { my($self, $column, $amount) = @_;
+ $self->$column + $amount > 0;
+ },
+);
+my %op2warncondition = (
+ '-' => sub { my($self, $column, $amount) = @_;
+ my $threshold = $column . '_threshold';
+ $self->$column - $amount <= $self->$threshold + 0;
+ },
+ '+' => sub { my($self, $column, $amount) = @_;
+ $self->$column + $amount > 0;
+ },
+);
+
+sub _op_usage {
+ my( $self, $op, $column, $amount ) = @_;
+
+ warn "$me _op_usage called for $column on svcnum ". $self->svcnum.
+ ' ('. $self->email. "): $op $amount\n"
+ if $DEBUG;
+
+ return '' unless $amount;
+
+ local $SIG{HUP} = 'IGNORE';
+ local $SIG{INT} = 'IGNORE';
+ local $SIG{QUIT} = 'IGNORE';
+ local $SIG{TERM} = 'IGNORE';
+ local $SIG{TSTP} = 'IGNORE';
+ local $SIG{PIPE} = 'IGNORE';
+
+ my $oldAutoCommit = $FS::UID::AutoCommit;
+ local $FS::UID::AutoCommit = 0;
+ my $dbh = dbh;
+
+ my $sql = "UPDATE svc_acct SET $column = ".
+ " CASE WHEN $column IS NULL THEN 0 ELSE $column END ". #$column||0
+ " $op ? WHERE svcnum = ?";
+ warn "$me $sql\n"
+ if $DEBUG;
+
+ my $sth = $dbh->prepare( $sql )
+ or die "Error preparing $sql: ". $dbh->errstr;
+ my $rv = $sth->execute($amount, $self->svcnum);
+ die "Error executing $sql: ". $sth->errstr
+ unless defined($rv);
+ die "Can't update $column for svcnum". $self->svcnum
+ if $rv == 0;
+
+ my $action = $op2action{$op};
+
+ if ( $conf->exists("svc_acct-usage_$action")
+ && &{$op2condition{$op}}($self, $column, $amount) ) {
+ #my $error = $self->$action();
+ my $error = $self->cust_svc->cust_pkg->$action();
+ if ( $error ) {
+ $dbh->rollback if $oldAutoCommit;
+ return "Error ${action}ing: $error";
+ }
+ }
+
+ if ($warning_template && &{$op2warncondition{$op}}($self, $column, $amount)) {
+ my $wqueue = new FS::queue {
+ 'svcnum' => $self->svcnum,
+ 'job' => 'FS::svc_acct::reached_threshold',
+ };
+
+ my $to = '';
+ if ($op eq '-'){
+ $to = $warning_cc if &{$op2condition{$op}}($self, $column, $amount);
+ }
+
+ # x_threshold race
+ my $error = $wqueue->insert(
+ 'svcnum' => $self->svcnum,
+ 'op' => $op,
+ 'column' => $column,
+ 'to' => $to,
+ );
+ if ( $error ) {
+ $dbh->rollback if $oldAutoCommit;
+ return "Error queuing threshold activity: $error";
+ }
+ }
+
+ warn "$me update successful; committing\n"
+ if $DEBUG;
+ $dbh->commit or die $dbh->errstr if $oldAutoCommit;
+ '';
+
+}
+
+
+=item is_rechargeable
+
+Returns true if this svc_account can be "rechaged" and false otherwise.
+
+=cut
+
+sub is_rechargable {
+ my $self = shift;
+ $self->seconds ne ''
+ || $self->upbytes ne ''
+ || $self->downbytes ne ''
+ || $self->totalbytes ne '';
+}
+