minnestar / sessionizer

  def index

    unless Settings.show_schedule? || params[:force]

      redirect_to home_page_path

      return

    end

    use_cache = !params[:force]

    @event = schedule(event(use_cache))

    render layout: 'schedule'

  end

  def ical

    event = Event.current_event

    sessions = event.sessions.includes([:room, :timeslot])

    cal = Icalendar::Calendar.new

    # Set up timezone

    cal.timezone do

      timezone_id             "America/Chicago"

      daylight do

        timezone_offset_from  "-0600"

        timezone_offset_to    "-0500"

        timezone_name         "CDT"

        dtstart               "19700308T020000"

        add_recurrence_rule   "FREQ=YEARLY;BYMONTH=3;BYDAY=2SU"

      end

      standard do

        timezone_offset_from  "-0500"

        timezone_offset_to    "-0600"

        timezone_name         "CST"

        dtstart               "19701101T020000"

        add_recurrence_rule   "FREQ=YEARLY;BYMONTH=11;BYDAY=1SU"

      end

    end

    sessions.each do |session|

      next if session.timeslot.nil?

      cal.event do

        summary session.title

        organizer   "", :CN => session.presenter_names.join("\\, ")

        description session.summary

        dtstart     session.timeslot.starts_at.to_datetime

        dtend       session.timeslot.ends_at.to_datetime

        location    session.room.name

      end

    end

    render :text => cal.to_ical, :content_type => 'text/calendar'

  end

  protected

  def schedule(event)

    Rails.cache.fetch("#{event.cache_key}/schedule") do

      Event.includes(timeslots: { sessions: [:room, :presenters] }).find(event.id)

    end

  end

end