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=head1 NAME

  RT::Scrips - a collection of RT Scrip objects

=head1 SYNOPSIS

  use RT::Scrips;

=head1 DESCRIPTION


=head1 METHODS



=cut


package RT::Scrips;

use strict;
use warnings;

use base 'RT::SearchBuilder';

use RT::Scrip;
use RT::ObjectScrips;

sub Table { 'Scrips'}

sub _Init {
    my $self = shift;

    $self->{'with_disabled_column'} = 1;

    return ( $self->SUPER::_Init(@_) );
}

=head2 LimitToQueue

Takes a queue id (numerical) as its only argument. Makes sure that 
Scopes it pulls out apply to this queue (or another that you've selected with
another call to this method

=cut

sub LimitToQueue  {
    my $self = shift;
    my $queue = shift;
    return unless defined $queue;

    my $alias = RT::ObjectScrips->new( $self->CurrentUser )
        ->JoinTargetToThis( $self );
    $self->Limit(
        ALIAS => $alias,
        FIELD => 'ObjectId',
        VALUE => int $queue,
    );
}


=head2 LimitToGlobal

Makes sure that 
Scopes it pulls out apply to all queues (or another that you've selected with
another call to this method or LimitToQueue

=cut


sub LimitToGlobal  {
    my $self = shift;
    return $self->LimitToQueue(0);
}

sub LimitToAdded {
    my $self = shift;
    return RT::ObjectScrips->new( $self->CurrentUser )
        ->LimitTargetToAdded( $self => @_ );
}

sub LimitToNotAdded {
    my $self = shift;
    return RT::ObjectScrips->new( $self->CurrentUser )
        ->LimitTargetToNotAdded( $self => @_ );
}

sub LimitByStage  {
    my $self = shift;
    my %args = @_%2? (Stage => @_) : @_;
    return unless defined $args{'Stage'};

    my $alias = RT::ObjectScrips->new( $self->CurrentUser )
        ->JoinTargetToThis( $self, %args );
    $self->Limit(
        ALIAS => $alias,
        FIELD => 'Stage',
        VALUE => $args{'Stage'},
    );
}

=head2 LimitByTemplate

Takes a L<RT::Template> object and limits scrips to those that
use the template.

=cut

sub LimitByTemplate {
    my $self = shift;
    my $template = shift;

    $self->Limit( FIELD => 'Template', VALUE => $template->Name );

    if ( $template->Queue ) {
        # if template is local then we are interested in global and
        # queue specific scrips
        $self->LimitToQueue( $template->Queue );
        $self->LimitToGlobal;
    }
    else { # template is global

        # if every queue has a custom version then there
        # is no scrip that uses the template
        {
            my $queues = RT::Queues->new( RT->SystemUser );
            my $alias = $queues->Join(
                TYPE   => 'LEFT',
                ALIAS1 => 'main',
                FIELD1 => 'id',
                TABLE2 => 'Templates',
                FIELD2 => 'Queue',
            );
            $queues->Limit(
                LEFTJOIN   => $alias,
                ALIAS      => $alias,
                FIELD      => 'Name',
                VALUE      => $template->Name,
            );
            $queues->Limit(
                ALIAS      => $alias,
                FIELD      => 'id',
                OPERATOR   => 'IS',
                VALUE      => 'NULL',
            );
            return $self->Limit( FIELD => 'id', VALUE => 0 )
                unless $queues->Count;
        }

        # otherwise it's either a global scrip or application to
        # a queue with custom version of the template.
        my $os_alias = RT::ObjectScrips->new( $self->CurrentUser )
            ->JoinTargetToThis( $self );
        my $tmpl_alias = $self->Join(
            TYPE   => 'LEFT',
            ALIAS1 => $os_alias,
            FIELD1 => 'ObjectId',
            TABLE2 => 'Templates',
            FIELD2 => 'Queue',
        );
        $self->Limit(
            LEFTJOIN => $tmpl_alias, ALIAS => $tmpl_alias, FIELD => 'Name', VALUE => $template->Name,
        );
        $self->Limit(
            LEFTJOIN => $tmpl_alias, ALIAS => $tmpl_alias, FIELD => 'Queue', OPERATOR => '!=', VALUE => 0,
        );

        $self->_OpenParen('UsedBy');
        $self->Limit( SUBCLAUSE => 'UsedBy', ALIAS => $os_alias, FIELD => 'ObjectId', VALUE => 0 );
        $self->Limit(
            SUBCLAUSE => 'UsedBy',
            ALIAS => $tmpl_alias,
            FIELD => 'id',
            OPERATOR => 'IS',
            VALUE => 'NULL',
        );
        $self->_CloseParen('UsedBy');
    }
}

sub ApplySortOrder {
    my $self = shift;
    my $order = shift || 'ASC';
    $self->OrderByCols( {
        ALIAS => RT::ObjectScrips->new( $self->CurrentUser )
            ->JoinTargetToThis( $self => @_ )
        ,
        FIELD => 'SortOrder',
        ORDER => $order,
    } );
}

=head2 AddRecord

Overrides the collection to ensure that only scrips the user can see are
returned.

=cut

sub AddRecord {
    my $self = shift;
    my ($record) = @_;

    return unless $record->CurrentUserHasRight('ShowScrips');
    return $self->SUPER::AddRecord( $record );
}

=head2 Apply

Run through the relevant scrips.  Scrips will run in order based on 
description.  (Most common use case is to prepend a number to the description,
forcing the scrips to run in ascending alphanumerical order.)

=cut

sub Apply {
    my $self = shift;

    my %args = ( TicketObj      => undef,
                 Ticket         => undef,
                 Transaction    => undef,
                 TransactionObj => undef,
                 Stage          => undef,
                 Type           => undef,
                 @_ );

    $self->Prepare(%args);
    $self->Commit();

}

=head2 Commit

Commit all of this object's prepared scrips

=cut

sub Commit {
    my $self = shift;

    foreach my $scrip (@{$self->Prepared}) {
        $RT::Logger->debug(
            "Committing scrip #". $scrip->id
            ." on txn #". $self->{'TransactionObj'}->id
            ." of ticket #". $self->{'TicketObj'}->id
        );

        $scrip->Commit( TicketObj      => $self->{'TicketObj'},
                        TransactionObj => $self->{'TransactionObj'} );
    }

}


=head2 Prepare

Only prepare the scrips, returning an array of the scrips we're interested in
in order of preparation, not execution

=cut

sub Prepare { 
    my $self = shift;
    my %args = ( TicketObj      => undef,
                 Ticket         => undef,
                 Transaction    => undef,
                 TransactionObj => undef,
                 Stage          => undef,
                 Type           => undef,
                 @_ );

    #We're really going to need a non-acled ticket for the scrips to work
    $self->_SetupSourceObjects( TicketObj      => $args{'TicketObj'},
                                Ticket         => $args{'Ticket'},
                                TransactionObj => $args{'TransactionObj'},
                                Transaction    => $args{'Transaction'} );


    $self->_FindScrips( Stage => $args{'Stage'}, Type => $args{'Type'} );


    #Iterate through each script and check it's applicability.
    while ( my $scrip = $self->Next() ) {

          unless ( $scrip->IsApplicable(
                                     TicketObj      => $self->{'TicketObj'},
                                     TransactionObj => $self->{'TransactionObj'}
                   ) ) {
                   $RT::Logger->debug("Skipping Scrip #".$scrip->Id." because it isn't applicable");
                   next;
               }

        #If it's applicable, prepare and commit it
          unless ( $scrip->Prepare( TicketObj      => $self->{'TicketObj'},
                                    TransactionObj => $self->{'TransactionObj'}
                   ) ) {
                   $RT::Logger->debug("Skipping Scrip #".$scrip->Id." because it didn't Prepare");
                   next;
               }
        push @{$self->{'prepared_scrips'}}, $scrip;

    }

    return (@{$self->Prepared});

};

=head2 Prepared

Returns an arrayref of the scrips this object has prepared


=cut

sub Prepared {
    my $self = shift;
    return ($self->{'prepared_scrips'} || []);
}

=head2  _SetupSourceObjects { TicketObj , Ticket, Transaction, TransactionObj }

Setup a ticket and transaction for this Scrip collection to work with as it runs through the 
relevant scrips.  (Also to figure out which scrips apply)

Returns: nothing

=cut


sub _SetupSourceObjects {

    my $self = shift;
    my %args = ( 
            TicketObj => undef,
            Ticket => undef,
            Transaction => undef,
            TransactionObj => undef,
            @_ );


    if ( $args{'TicketObj'} ) {
        # This loads a clean copy of the Ticket object to ensure that we
        # don't accidentally escalate the privileges of the passed in
        # ticket (this function can be invoked from the UI).
        # We copy the TransactionBatch transactions so that Scrips
        # running against the new Ticket will have access to them. We
        # use RanTransactionBatch to guard against running
        # TransactionBatch Scrips more than once.
        $self->{'TicketObj'} = RT::Ticket->new( $self->CurrentUser );
        $self->{'TicketObj'}->Load( $args{'TicketObj'}->Id );
        if ( $args{'TicketObj'}->TransactionBatch ) {
            # try to ensure that we won't infinite loop if something dies, triggering DESTROY while 
            # we have the _TransactionBatch objects;
            $self->{'TicketObj'}->RanTransactionBatch(1);
            $self->{'TicketObj'}->{'_TransactionBatch'} = $args{'TicketObj'}->{'_TransactionBatch'};
        }
    }
    else {
        $self->{'TicketObj'} = RT::Ticket->new( $self->CurrentUser );
        $self->{'TicketObj'}->Load( $args{'Ticket'} )
          || $RT::Logger->err("$self couldn't load ticket $args{'Ticket'}");
    }

    if ( ( $self->{'TransactionObj'} = $args{'TransactionObj'} ) ) {
        $self->{'TransactionObj'}->CurrentUser( $self->CurrentUser );
    }
    else {
        $self->{'TransactionObj'} = RT::Transaction->new( $self->CurrentUser );
        $self->{'TransactionObj'}->Load( $args{'Transaction'} )
          || $RT::Logger->err( "$self couldn't load transaction $args{'Transaction'}");
    }
} 



=head2 _FindScrips

Find only the appropriate scrips for whatever we're doing now.  Order
them by the SortOrder field from the ObjectScrips table.

=cut

sub _FindScrips {
    my $self = shift;
    my %args = (
                 Stage => undef,
                 Type => undef,
                 @_ );


    $self->LimitToQueue( $self->{'TicketObj'}->QueueObj->Id );
    $self->LimitToGlobal;
    $self->LimitByStage( $args{'Stage'} );

    my $ConditionsAlias = $self->Join(
        ALIAS1 => 'main',
        FIELD1 => 'ScripCondition',
        TABLE2 => 'ScripConditions',
        FIELD2 => 'id',
    );

    #We only want things where the scrip applies to this sort of transaction
    # TransactionBatch stage can define list of transaction
    foreach( split /\s*,\s*/, ($args{'Type'} || '') ) {
        $self->Limit(
            ALIAS           => $ConditionsAlias,
            FIELD           => 'ApplicableTransTypes',
            OPERATOR        => 'LIKE',
            VALUE           => $_,
            ENTRYAGGREGATOR => 'OR',
        )
    }

    # Or where the scrip applies to any transaction
    $self->Limit(
        ALIAS           => $ConditionsAlias,
        FIELD           => 'ApplicableTransTypes',
        OPERATOR        => 'LIKE',
        VALUE           => "Any",
        ENTRYAGGREGATOR => 'OR',
    );

    $self->ApplySortOrder;

    # we call Count below, but later we always do search
    # so just do search and get count from results
    $self->_DoSearch if $self->{'must_redo_search'};

    $RT::Logger->debug(
        "Found ". $self->Count ." scrips for $args{'Stage'} stage"
        ." with applicable type(s) $args{'Type'}"
        ." for txn #".$self->{TransactionObj}->Id
        ." on ticket #".$self->{TicketObj}->Id
    );
}

RT::Base->_ImportOverlays();

1;
