defmodule Nitroux.Utils do
  @doc """
   Generates dynamic open and closing tags around content
    iex> Nitroux.Utils.tag("div", ["hello", " ", "world"])
    "<div>hello world</div>"

    Nitroux.Utils.tag("div", [])
    "<div>hello world</div>"

    Nitroux.Utils.tag("div", [html: "hello world"])
    "<div>hello world</div>"

    Nitroux.Utils.tag("div", [class: "test", html: "hello world"])
    "<div class=\"test\">hello world</div>"
  """
  def tag(name, attrs, container \\ true)
  def tag(name, _, false), do: "<#{name}/>"

  def tag(name, [{_, _} | _t] = keywordlist, _container),
    do: "<#{name}#{add_attributes(keywordlist)}>#{Keyword.get(keywordlist, :html, "")}</#{name}>"

  def tag(name, [_h | _t] = list, _container), do: name |> tag(html: Enum.join(list))
  def tag(name, [], _container), do: name |> tag([], true)
  def tag(name, text, _) when is_binary(text), do: "<#{name}>#{text}</#{name}>"

  defp add_attributes(attrs) do
    attrs
    |> Keyword.filter(fn {key, _} ->
      key !== :html
    end)
    |> Enum.map(fn {key, val} -> "#{key}=\"#{val}\"" end)
    |> Enum.join(" ")
    |> case do
      "" -> ""
      res -> " " <> res
    end
  end
end