module SimpleCalendar
  class Calendar
    def group_events_by_date(events)
      events_grouped_by_date = Hash.new { |h, k| h[k] = [] }

      events.each do |event|
        event_start_date = event.send(attribute).to_date
        event_end_date = (event.respond_to?(end_attribute) && !event.send(end_attribute).nil?) ? event.send(end_attribute).to_date : event_start_date

        (event_start_date..event_end_date.to_date).each do |enumerated_date|
          date_key = ignore_year ? enumerated_date.strftime("%m-%d") : enumerated_date
          events_grouped_by_date[date_key] << event
        end
      end

      events_grouped_by_date
    end

    def sorted_events_for(day)
      date_key = ignore_year ? day.strftime("%m-%d") : day
      Array.wrap(sorted_events[date_key])
    end

    def ignore_year
      options.fetch(:ignore_year, false)
    end
  end
end

def index
  start_date = params.fetch(:start_date, Date.today).to_date
  @people = Person.where("DATE_PART('month', birthday) = :month", month: start_date.month)
end