defmodule JOL.Blog.Post do
  @enforce_keys [:author, :title, :body, :tags, :date, :slug, :lede]
  defstruct [:author, :draft, :title, :body, :tags, :date, :slug, :lede]

  def build(_filename, attrs, body) do
    struct!(
      __MODULE__,
      [author: "Jessica Phoenix Canady", body: body, lede: extract_lede(body)] ++
        Map.to_list(attrs)
    )
  end

  defp extract_lede(text) do
    case Regex.named_captures(~r/(?<lede>.*)\n<!-- more -->/s, text) do
      %{"lede" => lede} ->
        lede

      _ ->
        text
        |> String.split()
        |> Enum.take(50)
        |> Enum.join(" ")
    end
  end
end