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=head1 NAME

  RT::Action::EscalatePriority

=head1 DESCRIPTION

EscalatePriority is a ScripAction which is NOT intended to be called
per transaction. It's intended to be called by an RT escalation tool.
One such tool is called rt-crontool and is located in $RTHOME/bin (see
C<rt-crontool -h> for more details)

EscalatePriority uses the following formula to change a ticket's priority:

    Priority = Priority +  (( FinalPriority - Priority ) / ( DueDate-Today))

Unless the duedate is past, in which case priority gets bumped straight
to final priority.

In this way, priority is either increased or decreased toward the final priority
as the ticket heads toward its due date.

Alternately, if you don't set a due date, the Priority will be incremented by 1
until it reaches the Final Priority.  If a ticket without a due date has a Priority
greater than Final Priority, it will be decremented by 1.

=head2 CONFIGURATION

EscalatePriority's behavior can be controlled by two options:

=over 4

=item RecordTransaction

If true (the default), the action causes a transaction on the ticket
when it is escalated.  If false, the action updates the priority without
running scrips or recording a transaction.

=item UpdateLastUpdated

If true (the default), the action updates the LastUpdated field when the
ticket is escalated.  You cannot set C<UpdateLastUpdated> to false unless
C<RecordTransaction> is also false.

=back

To use these with C<rt-crontool>, specify them with C<--action-arg>:

    --action-arg "RecordTransaction: 0, UpdateLastUpdated: 0"

=cut


package RT::Action::EscalatePriority;
use base 'RT::Action';

use strict;
use warnings;

#Do what we need to do and send it out.

#What does this type of Action does

sub Describe  {
  my $self = shift;
  return (ref $self . " will move a ticket's priority toward its final priority.");
}


sub Prepare  {
    my $self = shift;

    if ($self->TicketObj->Priority() == $self->TicketObj->FinalPriority()) {
        # no update necessary.
        return 0;
    }

    #compute the number of days until the ticket is due
    my $due = $self->TicketObj->DueObj();


    # If we don't have a due date, adjust the priority by one
    # until we hit the final priority
    if (not $due->IsSet) {
        if ( $self->TicketObj->Priority > $self->TicketObj->FinalPriority ){
            $self->{'prio'} = ($self->TicketObj->Priority - 1);
            return 1;
        }
        elsif ( $self->TicketObj->Priority < $self->TicketObj->FinalPriority ){
            $self->{'prio'} = ($self->TicketObj->Priority + 1);
            return 1;
        }
        # otherwise the priority is at the final priority. we don't need to
        # Continue
        else {
            return 0;
        }
    }

    # we've got a due date. now there are other things we should do
    else {
        my $diff_in_seconds = $due->Diff(time());
        my $diff_in_days = int( $diff_in_seconds / 86400);

        #if we haven't hit the due date yet
        if ($diff_in_days > 0 ) {

            # compute the difference between the current priority and the
            # final priority

            my $prio_delta =
              $self->TicketObj->FinalPriority() - $self->TicketObj->Priority;

            my $inc_priority_by = int( $prio_delta / $diff_in_days );

            #set the ticket's priority to that amount
            $self->{'prio'} = $self->TicketObj->Priority + $inc_priority_by;

        }
        #if $days is less than 1, set priority to final_priority
        else {
            $self->{'prio'} = $self->TicketObj->FinalPriority();
        }

    }
    return 1;
}

sub Commit {
    my $self = shift;
    my $new_value = $self->{'prio'};
    return 1 unless defined $new_value;

    my $ticket = $self->TicketObj;
    return 1 if $ticket->Priority == $new_value;

    # Overide defaults from argument
    my($record, $update) = (1, 1);
    {
        my $arg = $self->Argument || '';
        if ( $arg =~ /RecordTransaction:\s*(\d+)/i ) {
            $record = $1;
            $RT::Logger->debug("Overrode RecordTransaction: $record");
        }
        if ( $arg =~ /UpdateLastUpdated:\s*(\d+)/i ) {
            $update = $1;
            $RT::Logger->debug("Overrode UpdateLastUpdated: $update");
        }
        # If creating a transaction, we have to update lastupdated
        $update = 1 if $record;
    }

    $RT::Logger->debug(
       'Escalating priority of ticket #'. $ticket->Id
       .' from '. $ticket->Priority .' to '. $new_value
       .' and'. ($record? '': ' do not') .' record a transaction'
       .' and'. ($update? '': ' do not') .' touch last updated field'
    );

    my ($val, $msg);
    unless ( $record ) {
        unless ( $update ) {
            ( $val, $msg ) = $ticket->__Set(
                Field => 'Priority',
                Value => $new_value,
            );
        } else {
            ( $val, $msg ) = $ticket->_Set(
                Field => 'Priority',
                Value => $new_value,
                RecordTransaction => 0,
            );
        }
    } else {
        ($val, $msg) = $ticket->SetPriority($new_value);
    }

    unless ($val) {
        $RT::Logger->error( "Couldn't set new priority value: $msg");
        return (0, $msg);
    }
    return 1;
}

RT::Base->_ImportOverlays();

1;
