defmodule Serum.Build.FileLoader.Posts do
  @moduledoc false

  _moduledocp = "A module for loading posts from a project."

  import Serum.Build.FileLoader.Common
  import Serum.IOProxy
  alias Serum.Plugin
  alias Serum.Result

  @doc false
  @spec load(binary(), binary()) :: Result.t([Serum.File.t()])
  def load(src, posts_source) do
    put_msg(:info, "Loading post files...")

    posts_dir = get_subdir(src, posts_source)

    if File.exists?(posts_dir) do
      [posts_dir, "**", "*"]
      |> Path.join()
      |> Path.wildcard()
      |> Enum.reject(&File.dir?/1)
      |> Enum.sort(Serum.Build.FileNameHandler)
      |> Plugin.reading_posts()
      |> case do
        {:ok, files} -> read_files(files)
        {:error, _} = plugin_error -> plugin_error
      end
    else
      put_err(:warn, "Cannot access the posts directory. Your blog will not be generated.")

      {:ok, []}
    end
  end
end