module Exlibris
  module Primo
    module Source
      # == Overview
      # Exlibris::Primo::Source::Aleph is an Exlibris::Primo::Holding that provides a link to Aleph
      # and a request button based on config settings in the Primo config file.
      class Aleph < Exlibris::Primo::Holding
        @attribute_aliases = Exlibris::Primo::Holding.attribute_aliases.merge({
          :aleph_doc_library => :original_source_id, :aleph_sub_library => :library,
          :aleph_collection => :collection, :aleph_call_number => :call_number,
          :aleph_doc_number => :source_record_id
        })
        @decode_variables = Exlibris::Primo::Holding.decode_variables.merge({
          :aleph_sub_library_code => { :code => :library_code }
        })

        # Overwrites Exlibris::Primo::Holding#new
        def initialize(parameters={})
          super(parameters)
          @aleph_local_base = aleph_config["local_base"] unless aleph_config.nil?
          # Aleph holdings page
          @url = "#{@source_url}/F?func=item-global&doc_library=#{aleph_doc_library}&local_base=#{@aleph_local_base}&doc_number=#{aleph_doc_number}&sub_library=#{@aleph_sub_library_code}"
          # Aleph doesn't work right so we have to push the patron to the Aleph holdings page!
          @request_url = url if requestable?
          @source_data.merge!({
            :aleph_doc_library => aleph_doc_library,
            :aleph_sub_library => aleph_sub_library,
            :aleph_sub_library_code => @aleph_sub_library_code,
            :aleph_collection => aleph_collection,
            :aleph_call_number => aleph_call_number,
            :aleph_doc_number => aleph_doc_number
          })
        end

        protected
        # Maps @source config to aleph_config for convenience.
        def aleph_config
          return @source_config
        end

        private
        def requestable?
          # Default to nothing is requestable
          return false if aleph_config.nil? or aleph_config["requestable_statuses"].nil?
          return aleph_config["requestable_statuses"].include?(@status_code) 
        end
      end
    end
  end
end