module Vendors
  module Vistar
    class VistarFetchSchedule
      def initialize(tokens)
        @tokens = tokens
      end

      def call(params)
        fetch = fetch_ad(params)
        return nil unless fetch && fetch[:advertisement]

        ad = fetch[:advertisement][0]
        {
          contents: [
            {
              name: "vistar_asset_#{ad[:asset_id]}",
              url: ad[:asset_url]
            }
          ],
          startTime: Time.at(ad[:display_time]).to_datetime,
          items: [
            {
              contentIndex: 0,
              duration: "#{ad[:length_in_seconds]}s",
              pop_url: ad[:proof_of_play_url]
            }
          ]
        }
      end

    private
      def fetch_ad(params)
        Vendors::Vistar::VistarFetchAd.new(@tokens).call(params)
      end
    end
  end
end