module Scrivito
  class ObjCreateParamsParser < Struct.new(:host, :port, :context)
    def parse(params)
      params = params.deep_dup
      convert_params(params)
      params
    end

    private

    def convert_params(params)
      if obj_class = params['_obj_class']
        obj_class = Obj.type_computer.compute_type_without_fallback(obj_class)
        convert_field_params(params, obj_class.attribute_definitions)
      else
        raise ArgumentError, 'Missing "_obj_class" param'
      end
    end

    def convert_field_params(params, attribute_definitions)
      params.each_pair do |key, value|
        params[key] = case attribute_definitions[key.to_s].try(:type)
          when 'binary'     then parse_binary_params(value)
          when 'html'       then ContentConversion.convert_html_links(value, host, port)
          when 'link'       then ContentConversion.convert_link(value, host, port)
          when 'linklist'   then ContentConversion.convert_linklist_urls(value, host, port)
          when 'date'       then DateConversion.deserialize_from_client(value)
          else value
          end
      end
    end

    def parse_binary_params(params)
      return unless params
      UploadedBinary.new(params)
    end
  end
end