class ConferenceRegistration < ActiveRecord::Base
  belongs_to :conference
  belongs_to :user
  has_many :conference_registration_responses

  AttendingOptions = [:yes, :no]

  def languages
    user.languages
  end

  def self.all_housing_options
    [:none, :tent, :house]
  end

  def self.all_spaces
    [:bed_space, :floor_space, :tent_space]
  end

  def self.all_bike_options
    [:yes, :no]
  end

  def self.all_food_options
    [:meat, :vegetarian, :vegan]
  end

  def self.all_considerations
    [:vegan, :smoking, :pets, :quiet]
  end

  def city
    city_id.present? ? City.find(city_id) : nil
  end

  def status(was = false)
    # our user hasn't registered if their user doesn't exist or they haven't entered a city
    return :unregistered if user.nil? || check(:city, was).blank?

    # registration completes once a guest has entered a housing preference or
    #   a housing provider has opted in or out of providing housing
    return :preregistered unless
      check(:housing, was).present? || !check(:can_provide_housing, was).nil?

    # they must be registered
    return :registered
  end

  around_update :check_status

  def check_status
    yield
    
    old_status = status(true)
    new_status = status

    if old_status.present? && old_status != new_status
      if (conference.registration_status == :pre && new_status == :preregistered) ||
        (conference.registration_status == :open && new_status == :registered)

        UserMailer.send_mail :registration_confirmation do
          {
            :args => self
          }
        end
      end
    end
  end

private
  def check(field, was)
    send("#{field}#{was ? '_was' : ''}")
  end
end