tehama_client_ex

defmodule TehamaClient.Config do
  @moduledoc """
  Stores configuration variables used to communicate with Tehama's API.

  """

  @doc """
  Returns the Base URL used for the API.:

      config :tehama_client_ex, api_base_url: "<base url>"
  """
  def api_base_url, do: get_env(:api_base_url, "https://api-v3.tehamawireless.net")

  def get_env(key, default \\ nil) do
    from_env(:tehama_client_ex, key, default)
  end

  @doc """
  A light wrapper around `Application.get_env/2`, providing automatic support for
  `{:system, "VAR"}` tuples.
  """
  @spec from_env(atom, atom, any) :: any
  def from_env(otp_app, key, default \\ nil)

  def from_env(otp_app, key, default) do
    otp_app
    |> Application.get_env(key, default)
    |> read_from_system(default)
  end

  defp read_from_system({:system, env}, default), do: System.get_env(env) || default
  defp read_from_system(value, _default), do: value
end