defmodule Frenzy.Pipeline.Extractor.WhateverScalzi do
  @moduledoc """
  Extractor for https://whatever.scalzi.com
  """

  alias Frenzy.Pipeline.Extractor
  @behaviour Extractor

  @impl Extractor
  def extract(html_tree) do
    case get_article_content(html_tree) do
      nil ->
        {:error, "no matching elements"}

      elem ->
        {:ok, elem}
    end
  end

  defp get_article_content(html_tree) do
    case Floki.find(html_tree, "article.post > div.entry-content") do
      [content_elem | _] ->
        # remove social media buttons that are included in the .entry-content element
        Floki.filter_out(content_elem, "div#jp-post-flair")

      _ ->
        nil
    end
  end
end