require 'ostruct'

class ThemePresentation
  def self.wrap(data, *presenters)
    normalized = normalize(data)
    presenters = normalize_presenters(presenters)

    wrapped_data = presenters.inject(normalized) do |wrapped, presenter|
      presenter.new(wrapped)
    end

    class << wrapped_data
      attr_accessor :wrapped_by
    end

    wrapped_data.wrapped_by = presenters

    wrapped_data
  end

  def self.wrap_collection(collection, *presenters)
    collection.collect { |item| wrap(item, *presenters) }
  end

  private

  def self.normalize(data)
    if data.is_a? Hash
      OpenStruct.new(data)
    else
      data
    end
  end

  def self.normalize_presenters(presenters)
    presenters.reject!(&:nil?)
    add_class_delegation(presenters)

    presenters
  end

  def self.add_class_delegation(presenters)
    presenters.each do |presenter|
      presenter.class_eval do
        def class
          __getobj__.class
        end
      end
    end
  end
end