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=head1 NAME

  RT::SearchBuilder - a baseclass for RT collection objects

=head1 SYNOPSIS

=head1 DESCRIPTION


=head1 METHODS




=cut

package RT::SearchBuilder;

use RT::Base;
use DBIx::SearchBuilder "1.40";

use strict;
use warnings;


use base qw(DBIx::SearchBuilder RT::Base);

sub _Init  {
    my $self = shift;
    
    $self->{'user'} = shift;
    unless(defined($self->CurrentUser)) {
	use Carp;
	Carp::confess("$self was created without a CurrentUser");
	$RT::Logger->err("$self was created without a CurrentUser");
	return(0);
    }
    $self->SUPER::_Init( 'Handle' => $RT::Handle);
}

sub CleanSlate {
    my $self = shift;
    $self->{'_sql_aliases'} = {};
    return $self->SUPER::CleanSlate(@_);
}

sub JoinTransactions {
    my $self = shift;
    my %args = ( New => 0, @_ );

    return $self->{'_sql_aliases'}{'transactions'}
        if !$args{'New'} && $self->{'_sql_aliases'}{'transactions'};

    my $alias = $self->Join(
        ALIAS1 => 'main',
        FIELD1 => 'id',
        TABLE2 => 'Transactions',
        FIELD2 => 'ObjectId',
    );

    my $item = $self->NewItem;
    my $object_type = $item->can('ObjectType') ? $item->ObjectType : ref $item;

    $self->RT::SearchBuilder::Limit(
        LEFTJOIN => $alias,
        FIELD    => 'ObjectType',
        VALUE    => $object_type,
    );
    $self->{'_sql_aliases'}{'transactions'} = $alias
        unless $args{'New'};

    return $alias;
}

sub OrderByCols {
    my $self = shift;
    my @sort;
    for my $s (@_) {
        next if defined $s->{FIELD} and $s->{FIELD} =~ /\W/;
        $s->{FIELD} = $s->{FUNCTION} if $s->{FUNCTION};
        push @sort, $s;
    }
    return $self->SUPER::OrderByCols( @sort );
}

# If we're setting RowsPerPage or FirstRow, ensure we get a natural number or undef.
sub RowsPerPage {
    my $self = shift;
    return if @_ and defined $_[0] and $_[0] =~ /\D/;
    return $self->SUPER::RowsPerPage(@_);
}

sub FirstRow {
    my $self = shift;
    return if @_ and defined $_[0] and $_[0] =~ /\D/;
    return $self->SUPER::FirstRow(@_);
}

=head2 LimitToEnabled

Only find items that haven't been disabled

=cut

sub LimitToEnabled {
    my $self = shift;

    $self->{'handled_disabled_column'} = 1;
    $self->Limit( FIELD => 'Disabled', VALUE => '0' );
}

=head2 LimitToDeleted

Only find items that have been deleted.

=cut

sub LimitToDeleted {
    my $self = shift;

    $self->{'handled_disabled_column'} = $self->{'find_disabled_rows'} = 1;
    $self->Limit( FIELD => 'Disabled', VALUE => '1' );
}

=head2 FindAllRows

Find all matching rows, regardless of whether they are disabled or not

=cut

sub FindAllRows {
    shift->{'find_disabled_rows'} = 1;
}

=head2 LimitCustomField

Takes a paramhash of key/value pairs with the following keys:

=over 4

=item CUSTOMFIELD - CustomField id. Optional

=item OPERATOR - The usual Limit operators

=item VALUE - The value to compare against

=back

=cut

sub _SingularClass {
    my $self = shift;
    my $class = ref($self);
    $class =~ s/s$// or die "Cannot deduce SingularClass for $class";
    return $class;
}

sub LimitCustomField {
    my $self = shift;
    my %args = ( VALUE        => undef,
                 CUSTOMFIELD  => undef,
                 OPERATOR     => '=',
                 @_ );

    my $alias = $self->Join(
	TYPE       => 'left',
	ALIAS1     => 'main',
	FIELD1     => 'id',
	TABLE2     => 'ObjectCustomFieldValues',
	FIELD2     => 'ObjectId'
    );
    $self->Limit(
	ALIAS      => $alias,
	FIELD      => 'CustomField',
	OPERATOR   => '=',
	VALUE      => $args{'CUSTOMFIELD'},
    ) if ($args{'CUSTOMFIELD'});
    $self->Limit(
	ALIAS      => $alias,
	FIELD      => 'ObjectType',
	OPERATOR   => '=',
	VALUE      => $self->_SingularClass,
    );
    $self->Limit(
	ALIAS      => $alias,
	FIELD      => 'Content',
	OPERATOR   => $args{'OPERATOR'},
	VALUE      => $args{'VALUE'},
    );
}

=head2 Limit PARAMHASH

This Limit sub calls SUPER::Limit, but defaults "CASESENSITIVE" to 1, thus
making sure that by default lots of things don't do extra work trying to 
match lower(colname) agaist lc($val);

We also force VALUE to C<NULL> when the OPERATOR is C<IS> or C<IS NOT>.
This ensures that we don't pass invalid SQL to the database or allow SQL
injection attacks when we pass through user specified values.

=cut

sub Limit {
    my $self = shift;
    my %ARGS = (
        CASESENSITIVE => 1,
        OPERATOR => '=',
        @_,
    );

    # We use the same regex here that DBIx::SearchBuilder uses to exclude
    # values from quoting
    if ( $ARGS{'OPERATOR'} =~ /IS/i ) {
        # Don't pass anything but NULL for IS and IS NOT
        $ARGS{'VALUE'} = 'NULL';
    }

    if ($ARGS{FUNCTION}) {
        ($ARGS{ALIAS}, $ARGS{FIELD}) = split /\./, delete $ARGS{FUNCTION}, 2;
        $self->SUPER::Limit(%ARGS);
    } elsif ($ARGS{FIELD} =~ /\W/
          or $ARGS{OPERATOR} !~ /^(=|<|>|!=|<>|<=|>=
                                  |(NOT\s*)?LIKE
                                  |(NOT\s*)?(STARTS|ENDS)WITH
                                  |(NOT\s*)?MATCHES
                                  |IS(\s*NOT)?
                                  |IN
                                  |\@\@)$/ix) {
        $RT::Logger->crit("Possible SQL injection attack: $ARGS{FIELD} $ARGS{OPERATOR}");
        $self->SUPER::Limit(
            %ARGS,
            FIELD    => 'id',
            OPERATOR => '<',
            VALUE    => '0',
        );
    } else {
        $self->SUPER::Limit(%ARGS);
    }
}

=head2 ItemsOrderBy

If it has a SortOrder attribute, sort the array by SortOrder.
Otherwise, if it has a "Name" attribute, sort alphabetically by Name
Otherwise, just give up and return it in the order it came from the
db.

=cut

sub ItemsOrderBy {
    my $self = shift;
    my $items = shift;
  
    if ($self->NewItem()->_Accessible('SortOrder','read')) {
        $items = [ sort { $a->SortOrder <=> $b->SortOrder } @{$items} ];
    }
    elsif ($self->NewItem()->_Accessible('Name','read')) {
        $items = [ sort { lc($a->Name) cmp lc($b->Name) } @{$items} ];
    }

    return $items;
}

=head2 ItemsArrayRef

Return this object's ItemsArray, in the order that ItemsOrderBy sorts
it.

=cut

sub ItemsArrayRef {
    my $self = shift;
    return $self->ItemsOrderBy($self->SUPER::ItemsArrayRef());
}

# make sure that Disabled rows never get seen unless
# we're explicitly trying to see them.

sub _DoSearch {
    my $self = shift;

    if ( $self->{'with_disabled_column'}
        && !$self->{'handled_disabled_column'}
        && !$self->{'find_disabled_rows'}
    ) {
        $self->LimitToEnabled;
    }
    return $self->SUPER::_DoSearch(@_);
}
sub _DoCount {
    my $self = shift;

    if ( $self->{'with_disabled_column'}
        && !$self->{'handled_disabled_column'}
        && !$self->{'find_disabled_rows'}
    ) {
        $self->LimitToEnabled;
    }
    return $self->SUPER::_DoCount(@_);
}

=head2 ColumnMapClassName

ColumnMap needs a Collection name to load the correct list display.
Depluralization is hard, so provide an easy way to correct the naive
algorithm that this code uses.

=cut

sub ColumnMapClassName {
    my $self = shift;
    my $Class = ref $self;
    $Class =~ s/s$//;
    $Class =~ s/:/_/g;
    return $Class;
}

RT::Base->_ImportOverlays();

1;
