defmodule Frenzy.OPML.Exporter do
  import XmlBuilder

  @spec export([Frenzy.Group.t()]) :: String.t()
  def export(groups) do
    element(:opml, %{version: "1.0"}, [
      element(:head, %{}, [
        element(:title, "Frenzy export")
      ]),
      element(
        :body,
        %{},
        Enum.map(groups, fn group ->
          element(
            :outline,
            %{text: group.title, title: group.title},
            Enum.map(group.feeds, fn feed ->
              element(:outline, %{
                type: "rss",
                text: feed.title,
                title: feed.title,
                xmlUrl: feed.feed_url,
                htmlUrl: feed.site_url
              })
            end)
          )
        end)
      )
    ])
    |> generate()
  end
end