class Notification::Bundle < ApplicationRecord
  belongs_to :user

  enum :status, %i[ pending processing delivered ]

  before_create :set_default_window

  scope :due, -> { pending.where("ends_at <= ?", Time.current) }

  class << self
    def deliver_all
      due.in_batches do |batch|
        DeliverJob.perform_all_later batch
      end
    end

    def deliver_all_later
      DeliverAllJob.perform_later
    end
  end

  def add(notification)
    update! ends_at: [ ends_at, notification.created_at ].max
  end

  def notifications
    user.notifications.where(created_at: window)
  end

  def deliver
    processing!
    BundleMailer.notification(self).deliver
    delivered!
  end

  def deliver_later
    DeliverJob.perform_later(self)
  end

  private
    AGGREGATION_PERIOD = 4.hours

    def set_default_window
      self.starts_at ||= Time.current
      self.ends_at ||= AGGREGATION_PERIOD.from_now
    end

    def window
      starts_at..ends_at
    end
end