# The base campaign class
#
# A Campaign is created with a unique code, which in turn generates PageViews,
# which maybe become Leads (Offers), which may result in Deals.
#
class Campaign < ActiveRecord::Base
  include E9Rails::ActiveRecord::STI

  belongs_to :campaign_group
  has_many   :deals, :inverse_of => :campaign
  has_many   :page_views, :inverse_of => :campaign

  # NOTE tracking cookie code changes with new visits
  has_many   :tracking_cookies, :foreign_key => :code, :primary_key => :code, :class_name => 'TrackingCookie'

  validates  :code, :presence   => true,
                    :length     => { :maximum => 32 }, 
                    :uniqueness => { :ignore_case => true }

  scope :active,   lambda { where(:active => true) }
  scope :inactive, lambda { where(:active => false) }

  ##
  # The sum cost of this campaign
  # (Must be implemented by subclasses)
  #
  def cost
    raise NotImplementedError
  end

  def to_s
    name
  end
end