class Paperclip::AttachmentRegistry

def self.clear
  instance.clear
end

def self.definitions_for(klass)
  instance.definitions_for(klass)
end

def self.each_definition(&block)
  instance.each_definition(&block)
end

def self.names_for(klass)
  instance.names_for(klass)
end

def self.register(klass, attachment_name, attachment_options)
  instance.register(klass, attachment_name, attachment_options)
end

def clear
  @attachments = Hash.new { |h,k| h[k] = {} }
end

def definitions_for(klass)
  parent_classes = klass.ancestors.reverse
  parent_classes.each_with_object({}) do |ancestor, inherited_definitions|
    inherited_definitions.deep_merge! @attachments[ancestor]
  end
end

def each_definition
  @attachments.each do |klass, attachments|
    attachments.each do |name, options|
      yield klass, name, options
    end
  end
end

def initialize
  clear
end

def names_for(klass)
  @attachments[klass].keys
end

def register(klass, attachment_name, attachment_options)
  @attachments ||= {}
  @attachments[klass] ||= {}
  @attachments[klass][attachment_name] = attachment_options
end