require 'kosher'
require 'barnie/helpers'

module Barnie
  class Response
    include Helpers
    include Enumerable

    attr_reader :page

    def initialize(page)
      raise Error.new('Blank page') if page.body.empty? && page.code == 200

      @page = page
    end

    def each(&block)
      page.search('#prod-container').each { |html| block.call(parse(html)) }
    end

    private

    def parse(html)
      price = extract_price(html.search('.price strong').text)
      hours = extract_ships_in(html.search('.availability').text) || 999
      title = title(html)
      link  = extract_link(title)
      isbn  = extract_isbn(link)

      Kosher::Book.new(
        'bn.com',
        isbn,
        nil,
        price > 0 ? 1 : 0,
        price > 0 ?
          [Kosher::Offer.new(
            nil,
            'bn.com',
            Kosher::Item.new(price, 'USD', 1, Kosher::Condition.new(1), Kosher::Description.new('')),
            Kosher::Seller.new(nil, 'Barnes & Noble.com', nil, Kosher::Location.new('US')),
            Kosher::Shipping.new(0, 'USD', Kosher::Availability.new(hours))
          )] :
          [])
    end
  end
end