module SearchKit
  class Events
    class Poll
      # The logic of interacting with the event service to retrieve and process
      # events is contained here.
      #
      class Process
        def self.perform(channel, &block)
          new(channel, &block).perform
        end

        attr_reader :block, :channel, :client

        def initialize(channel, &block)
          @block   = block
          @channel = channel
          @client  = SearchKit::Events.new
        end

        def perform
          events.each do |event|
            begin
              block.call(event)
            rescue
              raise
            else
              client.complete(event.id)
            end
          end
        end

        private

        def events
          response = client.pending(channel)
          response.fetch(:data, []).map { |raw| OpenStruct.new(raw) }
        end
      end

    end
  end
end