class Meta::Class;

use Set;
use Meta::Assoc;
use Meta::Attrib;
use Meta::Method;

use Meta::Util;

Has($?CLASS, "name", "Str");
Has($?CLASS, "abstract", "Bool");

# traits, really
Has($?CLASS, "attributes", "Set", { companion => "class" });
Has($?CLASS, "associations", "Set", { companion => "class" });
Has($?CLASS, "reverse_assocs", "Set", { companion => "dest" });
Has($?CLASS, "methods", "Set", { companion => "class" });
Has($?CLASS, "superclasses", "Set", { companion => "subclasses" });
Has($?CLASS, "subclasses", "Set", { companion => "superclasses" });

# every Meta::Class is a part of an object model object called the
# schema
Has($?CLASS, "schema", "Ref", { companion => "classes" });

# this code is a hashref from $LANG to auxilliary code in that
# language.
Has($?CLASS, "code", "Str");

# corresponding reverse attributes
#has Meta::Assoc @.rev_assocs;   # of assocs

method new($class: Str $name) returns Meta::Class {

    $.name = $name;
    return self;

}

# takes the object and "builds" it into a class
method apply {
    ...
}

# hmm, what do we need to test to check for circular superclasses?
# I guess that we're not the superclass of any superclass

method set_superclasses($self: Set $super) {

    my $supers = $self.all_superclasses;
    die "Uh-oh, there's a super in my duper!"
        if $supers.includes($self);

    $self.SUPER::set_superclasses($super);

}

method all_superclasses($self:) returns Set {
    if ( $:superclasses.size ) {
        return ([+] $:superclasses,
                $:superclasses.map:{ .all_superclasses });
    } else {
        return set();
    }
}

method all_attributes($self:) returns Set {
    set(
        set( $self.all_superclasses, $self ).members.map:{ .get_attributes }
       );
}

method all_methods($self:) returns Set {
    set(
        set( $self.all_superclasses, $self ).members.map:{ .get_methods }
       );
}

method all_assocs($self:) returns Set {
    set(
        set( $self.all_superclasses, $self ).members.map:{ .get_assocations }
       );
}

# sigh ... how you get used to infrastructure you've built up in Perl5

=head1 NAME

Meta::Class - Entities in the Perl 6 language model (M2)

=head1 SYNOPSIS

 my $role_mc = Meta::Class.new("Role");
 my $class_mc = Meta::Class.new("Class");

=head1 DESCRIPTION

Meta::Class objects are objects in the Perl 6 class system.

These objects are changed when you define new traits of Classes,
Roles, etc - or when you do even scarier things to the Perl 6 class
system.

Note that the files in this distribution at C<lib/Class.pm> will
probably eventually be auto-generated by methods called on
these objects.

=cut