require_relative "./post"

class Blog::Cache
  UPDATE_FREQUENCY = 60

  def initialize
    @topics = {}
    @dates = {}
    @last_update = 0
  end

  def need_update?
    Time.now.to_i > @last_update + UPDATE_FREQUENCY
  end

  def topics
    update! if need_update?
    @topics
  end

  def dates
    update! if need_update?
    @dates
  end

  def update!
    dates_files = Dir["blog/posts/dates/*"]
    topics_files = Dir["blog/posts/topics/*"]
    @dates = dates_files.map{ [_1, ::Blog::Post.get_by(date: File.basename(_1))] }.to_h
    @topics = topics_files.map{ [_1, ::Blog::Post.get_by(topic: File.basename(_1))] }.to_h
    @last_update = Time.now.to_i
  end

  def find_by_date(date)
    path = ::Blog::Post.date_to_filepath date
    dates[path]
  end

  def find_by_topic(topic)
    path = ::Blog::Post.topic_to_filepath topic
    topics[path]
  end
end