class UpdateDividersAndAgendaEntries < ActiveRecord::Migration

  # Auxiliary class to avoid validations and callbacks for agenda entries
  class AuxiliaryClass < ActiveRecord::Base
  
    set_table_name("agenda_entries")  
  
  end

  def self.up
    AuxiliaryClass.record_timestamps = false
    Event.all.each{|e|
      if e.days > 0
        (1..e.days).each do |d|
          day_contents = e.agenda.contents_for_day(d) 
          day_contents.each{|c|
            if (c.class == AgendaDivider)
              index_of_content = day_contents.index(c)
              unless index_of_content == (day_contents.length - 1)
                next_content = day_contents[index_of_content + 1]
                if (next_content.class == AgendaEntry)
                  next_auxiliary = AuxiliaryClass.find(next_content.id)
                  next_auxiliary.update_attribute(:divider, c.title)
                end
              end
              c.destroy
            end
          }
        end
      end
    
    }
  end

  def self.down
    raise "This migration cannot be reverted: UpdateDividersAndAgendaEntries"
  end
end