class ReadingList
  attr_accessor :user

  def initialize(user)
    @user = user
  end

  def get
    Article
      .joins(:reactions)
      .includes(:user)
      .where(reactions: reaction_criteria)
      .order("reactions.created_at" => :desc)
  end

  def cached_ids_of_articles
    Rails.cache.fetch("reading_list_ids_of_articles_#{user.id}_#{user.public_reactions_count}") do
      ids_of_articles
    end
  end

  def ids_of_articles
    Reaction.where(reaction_criteria).where.not(status: "archived").order(created_at: :desc).pluck(:reactable_id)
  end

  def count
    get.size
  end

  def reaction_criteria
    { user_id: user.id, reactable_type: "Article", category: "readinglist" }
  end
end