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=head1 NAME

  RT::Groups - a collection of RT::Group objects

=head1 SYNOPSIS

  use RT::Groups;
  my $groups = RT::Groups->new($CurrentUser);
  $groups->UnLimit();
  while (my $group = $groups->Next()) {
     print $group->Id ." is a group id\n";
  }

=head1 DESCRIPTION


=head1 METHODS



=cut


package RT::Groups;

use strict;
use warnings;



use RT::Group;

use base 'RT::SearchBuilder';

sub Table { 'Groups'}

use RT::Users;

# XXX: below some code is marked as subject to generalize in Groups, Users classes.
# RUZ suggest name Principals::Generic or Principals::Base as abstract class, but
# Jesse wants something that doesn't imply it's a Principals.pm subclass.
# See comments below for candidats.



sub _Init { 
  my $self = shift;
  $self->{'with_disabled_column'} = 1;

  my @result = $self->SUPER::_Init(@_);

  $self->OrderBy( ALIAS => 'main',
		  FIELD => 'Name',
		  ORDER => 'ASC');

  # XXX: this code should be generalized
  $self->{'princalias'} = $self->Join(
    ALIAS1 => 'main',
    FIELD1 => 'id',
    TABLE2 => 'Principals',
    FIELD2 => 'id'
  );

  # even if this condition is useless and ids in the Groups table
  # only match principals with type 'Group' this could speed up
  # searches in some DBs.
  $self->Limit( ALIAS => $self->{'princalias'},
                FIELD => 'PrincipalType',
                VALUE => 'Group',
              );

  return (@result);
}

=head2 PrincipalsAlias

Returns the string that represents this Users object's primary "Principals" alias.

=cut

# XXX: should be generalized, code duplication
sub PrincipalsAlias {
    my $self = shift;
    return($self->{'princalias'});

}



=head2 LimitToSystemInternalGroups

Return only SystemInternal Groups, such as "privileged" "unprivileged" and "everyone" 

=cut


sub LimitToSystemInternalGroups {
    my $self = shift;
    $self->Limit(FIELD => 'Domain', OPERATOR => '=', VALUE => 'SystemInternal');
    # All system internal groups have the same instance. No reason to limit down further
    #$self->Limit(FIELD => 'Instance', OPERATOR => '=', VALUE => '0');
}




=head2 LimitToUserDefinedGroups

Return only UserDefined Groups

=cut


sub LimitToUserDefinedGroups {
    my $self = shift;
    $self->Limit(FIELD => 'Domain', OPERATOR => '=', VALUE => 'UserDefined');
    # All user-defined groups have the same instance. No reason to limit down further
    #$self->Limit(FIELD => 'Instance', OPERATOR => '=', VALUE => '');
}




=head2 LimitToRolesForQueue QUEUE_ID

Limits the set of groups found to role groups for queue QUEUE_ID

=cut

sub LimitToRolesForQueue {
    my $self = shift;
    my $queue = shift;
    $self->Limit(FIELD => 'Domain', OPERATOR => '=', VALUE => 'RT::Queue-Role');
    $self->Limit(FIELD => 'Instance', OPERATOR => '=', VALUE => $queue);
}



=head2 LimitToRolesForTicket Ticket_ID

Limits the set of groups found to role groups for Ticket Ticket_ID

=cut

sub LimitToRolesForTicket {
    my $self = shift;
    my $Ticket = shift;
    $self->Limit(FIELD => 'Domain', OPERATOR => '=', VALUE => 'RT::Ticket-Role');
    $self->Limit(FIELD => 'Instance', OPERATOR => '=', VALUE => '$Ticket');
}



=head2 LimitToRolesForSystem System_ID

Limits the set of groups found to role groups for System System_ID

=cut

sub LimitToRolesForSystem {
    my $self = shift;
    $self->Limit(FIELD => 'Domain', OPERATOR => '=', VALUE => 'RT::System-Role');
}


=head2 WithMember {PrincipalId => PRINCIPAL_ID, Recursively => undef}

Limits the set of groups returned to groups which have
Principal PRINCIPAL_ID as a member. Returns the alias used for the join.

=cut

sub WithMember {
    my $self = shift;
    my %args = ( PrincipalId => undef,
                 Recursively => undef,
                 @_);
    my $members;

    if ($args{'Recursively'}) {
        $members = $self->NewAlias('CachedGroupMembers');
    } else {
        $members = $self->NewAlias('GroupMembers');
    }
    $self->Join(ALIAS1 => 'main', FIELD1 => 'id',
                ALIAS2 => $members, FIELD2 => 'GroupId');

    $self->Limit(ALIAS => $members, FIELD => 'MemberId', OPERATOR => '=', VALUE => $args{'PrincipalId'});
    $self->Limit(ALIAS => $members, FIELD => 'Disabled', VALUE => 0)
        if $args{'Recursively'};

    return $members;
}

sub WithoutMember {
    my $self = shift;
    my %args = (
        PrincipalId => undef,
        Recursively => undef,
        @_
    );

    my $members = $args{'Recursively'} ? 'CachedGroupMembers' : 'GroupMembers';
    my $members_alias = $self->Join(
        TYPE   => 'LEFT',
        FIELD1 => 'id',
        TABLE2 => $members,
        FIELD2 => 'GroupId',
    );
    $self->Limit(
        LEFTJOIN => $members_alias,
        ALIAS    => $members_alias,
        FIELD    => 'MemberId',
        OPERATOR => '=',
        VALUE    => $args{'PrincipalId'},
    );
    $self->Limit(
        LEFTJOIN => $members_alias,
        ALIAS    => $members_alias,
        FIELD    => 'Disabled',
        VALUE    => 0
    ) if $args{'Recursively'};
    $self->Limit(
        ALIAS    => $members_alias,
        FIELD    => 'MemberId',
        OPERATOR => 'IS',
        VALUE    => 'NULL',
        QUOTEVALUE => 0,
    );
}

=head2 WithRight { Right => RIGHTNAME, Object => RT::Record, IncludeSystemRights => 1, IncludeSuperusers => 0, EquivObjects => [ ] }


Find all groups which have RIGHTNAME for RT::Record. Optionally include global rights and superusers. By default, include the global rights, but not the superusers.



=cut

#XXX: should be generilized
sub WithRight {
    my $self = shift;
    my %args = ( Right                  => undef,
                 Object =>              => undef,
                 IncludeSystemRights    => 1,
                 IncludeSuperusers      => undef,
                 IncludeSubgroupMembers => 0,
                 EquivObjects           => [ ],
                 @_ );

    my $from_role = $self->Clone;
    $from_role->WithRoleRight( %args );

    my $from_group = $self->Clone;
    $from_group->WithGroupRight( %args );

    #XXX: DIRTY HACK
    use DBIx::SearchBuilder::Union;
    my $union = DBIx::SearchBuilder::Union->new();
    $union->add($from_role);
    $union->add($from_group);
    %$self = %$union;
    bless $self, ref($union);

    return;
}

#XXX: methods are active aliases to Users class to prevent code duplication
# should be generalized
sub _JoinGroups {
    my $self = shift;
    my %args = (@_);
    return 'main' unless $args{'IncludeSubgroupMembers'};
    return $self->RT::Users::_JoinGroups( %args );
}
sub _JoinGroupMembers {
    my $self = shift;
    my %args = (@_);
    return 'main' unless $args{'IncludeSubgroupMembers'};
    return $self->RT::Users::_JoinGroupMembers( %args );
}
sub _JoinGroupMembersForGroupRights {
    my $self = shift;
    my %args = (@_);
    my $group_members = $self->_JoinGroupMembers( %args );
    unless( $group_members eq 'main' ) {
        return $self->RT::Users::_JoinGroupMembersForGroupRights( %args );
    }
    $self->Limit( ALIAS => $args{'ACLAlias'},
                  FIELD => 'PrincipalId',
                  VALUE => "main.id",
                  QUOTEVALUE => 0,
                );
}
sub _JoinACL                  { return (shift)->RT::Users::_JoinACL( @_ ) }
sub _RoleClauses              { return (shift)->RT::Users::_RoleClauses( @_ ) }
sub _WhoHaveRoleRightSplitted { return (shift)->RT::Users::_WhoHaveRoleRightSplitted( @_ ) }
sub _GetEquivObjects          { return (shift)->RT::Users::_GetEquivObjects( @_ ) }
sub WithGroupRight            { return (shift)->RT::Users::WhoHaveGroupRight( @_ ) }
sub WithRoleRight             { return (shift)->RT::Users::WhoHaveRoleRight( @_ ) }

sub ForWhichCurrentUserHasRight {
    my $self = shift;
    my %args = (
        Right => undef,
        IncludeSuperusers => undef,
        @_,
    );

    # Non-disabled groups...
    $self->LimitToEnabled;

    # ...which are the target object of an ACL with that right, or
    # where the target is the system object (a global right)
    my $acl = $self->_JoinACL( %args );
    $self->_AddSubClause(
        ACLObjects => "( (main.id = $acl.ObjectId AND $acl.ObjectType = 'RT::Group')"
                   . " OR $acl.ObjectType = 'RT::System')");

    # ...and where that right is granted to any group..
    my $member = $self->Join(
        ALIAS1 => $acl,
        FIELD1 => 'PrincipalId',
        TABLE2 => 'CachedGroupMembers',
        FIELD2 => 'GroupId',
    );
    $self->Limit(
        ALIAS => $member,
        FIELD => 'Disabled',
        VALUE => '0',
    );

    # ...with the current user in it
    $self->Limit(
        ALIAS => $member,
        FIELD => 'MemberId',
        VALUE => $self->CurrentUser->Id,
    );

    return;
}

=head2 LimitToEnabled

Only find items that haven't been disabled

=cut

sub LimitToEnabled {
    my $self = shift;

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



sub Next {
    my $self = shift;

    # Don't show groups which the user isn't allowed to see.

    my $Group = $self->SUPER::Next();
    if ((defined($Group)) and (ref($Group))) {
	unless ($Group->CurrentUserHasRight('SeeGroup')) {
	    return $self->Next();
	}
	
	return $Group;
    }
    else {
	return undef;
    }
}



sub _DoSearch {
    my $self = shift;
    
    #unless we really want to find disabled rows, make sure we're only finding enabled ones.
    unless($self->{'find_disabled_rows'}) {
	$self->LimitToEnabled();
    }
    
    return($self->SUPER::_DoSearch(@_));
    
}



=head2 NewItem

Returns an empty new RT::Group item

=cut

sub NewItem {
    my $self = shift;
    return(RT::Group->new($self->CurrentUser));
}
RT::Base->_ImportOverlays();

1;
