module ChefSpec::API::Core

def chef_runner_class
  ChefSpec::SoloRunner
end

def chef_runner_instance
  chef_runner_class.new(chef_runner_options)
end

def chef_runner_options
  options = {
    step_into: chefspec_ancestor_gather([], :step_into) { |memo, val| memo | val },
    default_attributes: chefspec_default_attributes,
    normal_attributes: chefspec_normal_attributes,
    override_attributes: chefspec_override_attributes,
    automatic_attributes: chefspec_automatic_attributes,
    spec_declaration_locations: self.class.declaration_locations.last[0],
  }
  # Only specify these if set in the example so we don't override the
  # global settings.
  options[:platform] = chefspec_platform if chefspec_platform
  options[:version] = chefspec_platform_version if chefspec_platform_version
  # Merge in any final overrides.
  options.update(chefspec_attributes(:chefspec_options).symbolize_keys)
  options
end

def chefspec_ancestor_gather(start, method, &block)
  candidate_ancestors = self.class.ancestors.select { |cls| cls.respond_to?(method) && cls != ChefSpec::API::Core }
  candidate_ancestors.reverse.inject(start) do |memo, cls|
    block.call(memo, cls.send(method))
  end
end

def chefspec_attributes(method)
  chefspec_ancestor_gather(Mash.new, method) do |memo, val|
    Chef::Mixin::DeepMerge.merge(memo, val)
  end
end