yemux

defmodule Yemux.Yaml do
  @moduledoc ~S"""
  Yaml related helpers
  """

  def add_partials(yaml, config) do
    case Map.get(yaml, "include") do
      nil -> {:ok, yaml}
      include -> _get_include(yaml, include, config)
    end
  end

  def missing_keys(yaml, keys) do
    {values, missing} =
      keys
      |> Enum.reduce({[], []}, fn key, {values, missing} ->
        case Map.get(yaml, key) do
          nil -> {values, [key | missing]}
          value -> {[value | values], missing}
        end
      end)

    case {values, missing} do
      {values, []} -> {:ok, values}
      _ -> {:error, missing}
    end
  end

  defp _get_include(yaml, include, config) do
    case YamlElixir.read_from_file(
           Path.join(Map.get(config, "base_dir"), "sessions/_#{include}.yml")
         ) do
      {:ok, include_yaml} -> {:ok, Yemux.Session.merge_include(yaml, include_yaml)}
      {:error, %{message: message}} -> {:error, message}
    end
  end
end

# SPDX-License-Identifier: Apache-2.0