class Lecture < ApplicationRecord
  belongs_to :course
  has_one :attendance, dependent: :destroy
  has_one :recording, dependent: :nullify

  has_many :tracked_time_entries, dependent: :destroy

  enum :kind, [
    :lecture,
    :problems_class,
  ], default: :lecture

  def week_number
    ((start_time.beginning_of_week - course.semester_start_date.to_time) / 1.week).floor + 1
  end

  def live_video_url
    nil
  end
end