defmodule WhoNeedHelpWeb.SearchMetadata do
  @moduledoc false

  @locales ~w(en uk ru)

  def public_page_assigns(path) when is_binary(path) do
    locale = Gettext.get_locale(WhoNeedHelpWeb.Gettext)

    [
      page_robots: "index, follow",
      canonical_url: localized_url(path, locale),
      language_alternates:
        Enum.map(@locales, &{&1, localized_url(path, &1)}) ++
          [{"x-default", absolute_url(path)}]
    ]
  end

  def localized_url(path, "en"), do: absolute_url(path)

  def localized_url(path, locale) when locale in @locales do
    absolute_url(path) <> "?" <> URI.encode_query(%{"locale" => locale})
  end

  def localized_url(path, _unknown_locale), do: absolute_url(path)

  def absolute_url(path) do
    String.trim_trailing(WhoNeedHelpWeb.Endpoint.url(), "/") <> path
  end
end