class Library < ActiveRecord::Base
  include AASM

  belongs_to :user

  has_many :library_applies, dependent: :delete_all
  has_many :attachments, as: :container

  attr_accessible :title, :content

  validates :title, presence: true
  validates :content, presence: true
  validates :uuid, presence: true, uniqueness: true

  aasm(:status) do
    state :pending, initiali: true
    state :processing
    state :refused
    state :published

    event :submit do
      transitions from: [:pending, :refused], to: :processing
    end

    event :refuse do
      transitions from: :processing, to: :refused
    end

    event :publish do
      transitions from: :processing, to: :published
    end
  end

  def generate_uuid
    uuid = Util.generate_time_uuid
    while Library.exists?(uuid: uuid)
      uuid = Util.generate_time_uuid
    end

    self.uuid = uuid
  end

  def increment_visited_count!
    Library.connection.execute("update libraries set visited_count = COALESCE(visited_count, 0) + 1 where id = #{id}")
  end
end