class MightyStruct

# File lib/mighty_struct.rb, line 13
def initialize(object, options = {})
  unless self.class.new?(object)
    raise ArgumentError.new("Cannot create a an instance of #{self.class} for the given object!")
  end

  @cache = options[:caching] == :enabled ? {} : nil

  if (@object = object).respond_to?(:keys)
    object.keys.each do |_key|
      unless respond_to?(_key)
        define_singleton_method(_key) do
          if @cache
             @cache[_key] ||= self.class.new?(value = @object[_key]) ? self.class.new(value) : value
          else
            self.class.new?(value = @object[_key]) ? self.class.new(value) : value
          end
        end
      end
    end
  end
end

# File lib/mighty_struct.rb, line 4
def self.new?(object)
  object.is_a?(Enumerable)
end

# File lib/mighty_struct.rb, line 9
def self.to_object(object)
  object.is_a?(self) ? object.instance_variable_get(:@object) : object
end

# File lib/mighty_struct.rb, line 38
def method_missing(method_name, *arguments, &block)
  if @object.respond_to?(method_name)
    @cache.clear if @cache # clear the properties cache, because the called method may have side-effects
    result = @object.send(method_name, *arguments, &block)

    # ensure that results of called methods are mighty structs again
    self.class.new?(result) ? self.class.new(result) : result
  else
    super
  end
end

# File lib/mighty_struct.rb, line 50
def respond_to_missing?(method_name, include_private = false)
  @object.respond_to?(method_name) || super
end