defmodule Openapi do

  # This can change at any time and only returns a string so just ignore it.
  # coveralls-ignore-start
  @doc """
  Returns the bundled Swagger UI version used by the OpenAPI integration.

  This value corresponds to the static Swagger UI assets shipped with the library
  and is used for serving the documentation frontend.
  """
  def swagger_ui_version, do: "5.32.0"
  # coveralls-ignore-stop

  def read_file!(path) do
    path
    |> Path.extname()
    |> normalize_ext()
    |> dispatch!(path)
  end

  defp normalize_ext("." <> ext), do: ext
  defp normalize_ext(ext), do: ext

  defp dispatch!(ext, path) when ext in ["yaml", "yml"], do: Openapi.Loader.Yaml.read_file(path)
  defp dispatch!("json", path), do: Openapi.Loader.Json.read_file(path)
  defp dispatch!(_ext, path), do: raise(Openapi.Error, "Unsupported file extention: #{path}")

  def get_definition(server, default \\ %{}) do
    :persistent_term.get({:openapi, :specs, server}, default)
  end

  def save_definition(server, definition) do
    merged_definition =
      server
      |> get_definition()
      |> Openapi.Definition.merge(definition)
    :persistent_term.put({:openapi, :specs, server}, merged_definition)
  end

end