module VinService

  BASE_URL = 'https://service.blackbookcloud.com'.freeze
  VEHICLE_BY_VIN_URL = "#{BASE_URL}/UsedCarWS/UsedCarWS/UsedVehicle/VIN".freeze

  def range_by_vin(vin, query_params = {})
    url = "#{VEHICLE_BY_VIN_URL}/#{vin}"

    begin
      response = HTTParty.get(url, headers: headers, query: query_params)
      process_response(JSON.parse(response))
    rescue => e
      [{ error: e.to_s }, 500]
    end
  end

  def headers
    token = Base64.encode64("#{username}:#{password}")
    { Authorization: "Basic #{token}" }
  end

  def process_response(response)
    status = 200

    if response['error_count'].positive?
      response = { error: response['message_list'][0]['description'] }
      status = 400
    else
      response = map_fields(response)
    end

    [response, status]
  end

  def map_fields(response)
    return {} unless response && response['used_vehicles'] && response['used_vehicles']['used_vehicle_list']
    vehicle_range = response['used_vehicles']['used_vehicle_list'][0]

    return {
      range: {
        xclean: vehicle_range['adjusted_whole_xclean'],
        clean: vehicle_range['adjusted_whole_clean'],
        average: vehicle_range['adjusted_whole_avg'],
        rough: vehicle_range['adjusted_whole_rough']
      }
    }
  end
end