use strict;
use warnings;
package Test::Routine::Compositor;
# ABSTRACT: the tool for turning test routines into runnable classes
$Test::Routine::Compositor::VERSION = '0.023';
use Carp qw(confess);
use Class::Load;
use Moose::Meta::Class;
use Params::Util qw(_CLASS);
use Scalar::Util qw(blessed);

use namespace::clean;

sub _invocant_for {
  my ($self, $thing, $arg) = @_;

  confess "can't supply preconstructed object for running tests"
    if $arg and blessed $thing;

  return $thing if blessed $thing;

  $arg ||= {};
  my $new_class = $self->_class_for($thing);
  $new_class->name->new($arg);
}

sub _class_for {
  my ($class, $inv) = @_;

  confess "can't supply preconstructed object for test class construction"
    if blessed $inv;

  $inv = [ $inv ] if _CLASS($inv);

  my @bases;
  my @roles;

  for my $item (@$inv) {
    Class::Load::load_class($item);
    my $target = $item->meta->isa('Moose::Meta::Class') ? \@bases
               : $item->meta->isa('Moose::Meta::Role')  ? \@roles
               : confess "can't run tests for this weird thing: $item";

    push @$target, $item;
  }

  confess "can't build a test class from multiple base classes" if @bases > 1;
  @bases = 'Moose::Object' unless @bases;

  my $new_class = Moose::Meta::Class->create_anon_class(
    superclasses => \@bases,
    cache        => 1,
    (@roles ? (roles => \@roles) : ()),
  );

  return $new_class->name;
}

sub instance_builder {
  my ($class, $inv, $arg) = @_;

  confess "can't supply preconstructed object and constructor arguments"
    if $arg and blessed $inv;

  return sub { $inv } if blessed $inv;

  my $new_class = $class->_class_for($inv);
  $arg ||= {};

  return sub { $new_class->new($arg); };
}

1;

__END__

=pod

=encoding UTF-8

=head1 NAME

Test::Routine::Compositor - the tool for turning test routines into runnable classes

=head1 VERSION

version 0.023

=head1 AUTHOR

Ricardo Signes <rjbs@cpan.org>

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2010 by Ricardo Signes.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut