item.rb

class Item
  def initialize(data:)
    @data = data
  end

  def self.for(barcode, options = {})
    client = options[:alma_client] || AlmaRestClient.client(
      Faraday.new do |f|
        f.response :follow_redirects
      end
    )
    alma_response = client.get("/items", query: {item_barcode: barcode, expand: "due_date"})
    if alma_response.status == 200
      Item.new(data: alma_response.body)
    else
      EmptyItem.new
    end
  end

  def title
    @data.dig("bib_data", "title")
  end

  def library
    @data.dig("item_data", "library", "desc")
  end

  def location
    @data.dig("item_data", "location", "desc")
  end

  def shelving_location
    item_location = library || ""
    if location != "NONE"
      item_location << " #{location}"
    end
    item_location
  end

  def library_code
    @data.dig("item_data", "library", "value")
  end

  def item_policy
    @data.dig("item_data", "policy", "value")
  end

  def bookable?
    library_code == "FVL" && ["08", "09"].exclude?(item_policy)
  end

  def call_number
    @data.dig("holding_data", "call_number")
  end

  def barcode
    @data.dig("item_data", "barcode")
  end

  def due_date
    @data.dig("item_data", "due_date") || ""
  end

  def mms_id
    @data.dig("bib_data", "mms_id")
  end

  def holding_id
    @data.dig("holding_data", "holding_id")
  end

  def pid
    @data.dig("item_data", "pid")
  end

  def catalog_url
    "https://search.lib.umich.edu/catalog/record/#{mms_id}"
  end

  class EmptyItem < self
    def initialize
      @data = {}
    end

    # ['title', 'catalog_url', "library", "call_number", "pid",].each do |name|
    # define_method(name) do
    # ''
    # end
    # end
    def bookable?
      false
    end
  end
end