defmodule EslHn do
  @moduledoc """
  EslHn keeps the contexts that define your domain
  and business logic.

  Contexts are also responsible for managing your data, regardless
  if it comes from the database, an external API or others.
  """

  alias EslHn.Cache

  def all(page \\ 1, per_page \\ 10) do
    skip = per_page * (page - 1)

    ids = Cache.get(EslHn, :index, [])

    ids
    |> Enum.drop(skip)
    |> Enum.take(per_page)
    |> Enum.map(&Cache.get(EslHn, &1))
  end

  def story(id) do
    Cache.fetch(EslHn, id)
  end

  def broadcast_new(stories) do
    Phoenix.PubSub.broadcast(EslHn.PubSub, "hn:new", {:new_stories, stories})
  end

  def subscribe_new do
    Phoenix.PubSub.subscribe(EslHn.PubSub, "hn:new")
  end
end