defmodule ToweropsWeb.SitemapController do
  @moduledoc false

  use ToweropsWeb, :controller

  @public_urls ["/", "/privacy", "/terms", "/docs/api", "/docs/graphql", "/help"]

  def index(conn, _params) do
    base_url = ToweropsWeb.Endpoint.url()
    xml = build_sitemap(base_url)

    conn
    |> put_resp_content_type("text/xml")
    |> send_resp(200, xml)
  end

  defp build_sitemap(base_url) do
    urls =
      Enum.map_join(@public_urls, "\n", fn path -> "  <url><loc>#{base_url}#{path}</loc></url>" end)

    String.trim("""
    <?xml version="1.0" encoding="UTF-8"?>
    <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
    #{urls}
    </urlset>
    """)
  end
end