class Notification < ActiveRecord::Base
  enum level: %i[info warning danger]
  enum notification_type: %i[global]

  has_and_belongs_to_many :users, dependent: :destroy, join_table: 'notification_acknowledgements'

  validates :notification_type, :title, :level, :starts_at, :expires_at, :body, presence: true
  validate :valid_dates

  scope :active, (lambda do
    where('starts_at <= :now and :now < expires_at', now: Time.now)
  end)

  scope :active_per_user, (lambda do |user|
    if user.present?
      acknowledgement_ids = user.notifications.map(&:id)
      active.where.not(id: acknowledgement_ids)
    else
      active.where(dismissable: false)
    end
  end)

  # Has the Notification been acknowledged by the given user ?
  # If no user is given, currently logged in user (if any) is the default
  # @return [Boolean] is the Notification acknowledged ?
  def acknowledged?(user)
    users.include?(user) if user.present? && dismissable?
  end

  # Validate Notification dates
  def valid_dates
    return false if starts_at.blank? || expires_at.blank?
    errors.add(:starts_at, _('Should be today or later')) if starts_at < Date.today
    errors.add(:expires_at, _('Should be tomorrow or later')) if expires_at < Date.tomorrow
    if starts_at > expires_at
      errors.add(:starts_at, _('Should be before expiration date'))
      errors.add(:expires_at, _('Should be after start date'))
    end
  end
end