@spec list_channels(String.t(), String.t(), String.t()) ::
  {:ok, [String.t()]} | {:error, File.posix()}

Lists all channels with templates defined for scenario, notification type and template type.

@spec list_languages(String.t(), String.t(), String.t(), String.t()) ::
  {:ok, [String.t()]} | {:error, File.posix()}

Lists all template languages defined for senario, notification type, template type and channel.

@spec list_notification_types(String.t()) ::
  {:ok, [String.t()]} | {:error, File.posix()}

Lists all notification types for a scenario.

@spec list_template_types(String.t(), String.t()) ::
  {:ok, [String.t()]} | {:error, File.posix()}

Lists all template types of the specified notification.

@spec load_and_eval_templates(
  scenario_id :: String.t(),
  notification_type :: String.t(),
  template_type :: String.t(),
  channel :: String.t(),
  language :: String.t(),
  data :: keyword(),
  fallback_language :: String.t()
) :: {:ok, %{required(String.t()) => String.t()}} | {:error, atom(), String.t()}

Loads and evaluates templates specified by scenario, notification type, template type, channel and language.

If language is not defined or does not exist, fallback_language is used.

@spec load_spec(String.t()) :: {:ok, any()} | {:error, atom(), any()}

Tries to load the notification spec of the given scenario.

Returns

• {:ok, notification_spec} if the spec is found
• {:error, :cannot_load, exception} if the spec file cannot be found
• {:error, :bad_syntax, exception} if the spec file was found but contains syntactic errors