defmodule Funkspector.Utils do
  @moduledoc """
  Common functionality for the scrapers.
  """

  @doc """
  Given a collection of URLs and a base URL, absolutifies the relative links.

  ## Examples

      iex> Funkspector.Utils.absolutify(["javascript:alert(hi)", "/faqs?section=legal", "/about", "http://example.com/faqs"], "http://example.com")
      ["javascript:alert(hi)", "http://example.com/faqs?section=legal", "http://example.com/about", "http://example.com/faqs"]
  """
  def absolutify(links, base_url) when is_list(links) do
    links
    |> Enum.map(&absolutify(&1, base_url))
  end

  def absolutify(link, base_url) when is_binary(link) do
    URI.merge(base_url, link) |> to_string()
  end
end