class TrackableStat

  include MongoMapper::Document

  # MongoMapper Setup ==============================================================================

  many :trackable_sessions, :order => :created_at

  key :site, String, :index => true
  key :bounces, :default => 0
  key :clickthroughs, :default => 0
  key :conversions, :default => 0
  key :duration, :default => 0
  key :new_visits, :default => 0
  key :organic_visits, :default => 0
  key :pageviews, :default => 0
  key :ppc_visits, :default => 0
  key :direct_visits, :default => 0
  key :return_visits, :default => 0
  key :search_visits, :default => 0
  key :visits, :default => 0
  timestamps!

  # Scopes =========================================================================================
  
  scope :by_site,         lambda { |site| { :conditions => { :site => site } } }
  scope :by_date,         lambda { |date| { :conditions => { :created_at => { '$gte' => date.beginning_of_month,  '$lte' => date.end_of_month } } } }
  scope :for_date_range,  lambda { |start_date,end_date| { :conditions => { :created_at => { '$gte' => start_date.beginning_of_month,  '$lte' => end_date.end_of_month } } } }

  # Class Methods ==================================================================================

  def self.sites
    TrackableStat.all(:fields => :site).map{|s| s.site.downcase}.uniq
  end
    
  # Instance Methods ===============================================================================
  
  def touch(session, last_action, previous_action = nil)
    if previous_action.nil?
      # New session
      self.trackable_sessions << session
      self.clickthroughs  += 1 if last_action.clickthrough?
      self.conversions    += 1 if last_action.conversion?
      self.direct_visits  += 1 if session.kind == 'direct'
      self.new_visits     += 1 if session.new_visit
      self.organic_visits += 1 if session.kind == 'natural'
      self.pageviews      += 1
      self.ppc_visits     += 1 if session.kind == 'paid'
      self.return_visits  += 1 if ! session.new_visit
      self.search_visits  += 1 if session.kind == 'search'
      self.visits         += 1
      self.bounces        += 1 # Assume that it's a bounce until a second view is recorded
    else
      # Existing session
      self.clickthroughs  += 1 if last_action.clickthrough?
      self.conversions    += 1 if last_action.conversion?
      self.duration       += last_action.created_at - previous_action.created_at
      self.pageviews      += 1 if last_action.view?
      self.bounces        -= 1 if session.trackable_actions.count == 2
    end
    self.save
  end
  
end