defmodule LastFm.Config do
  @type t :: %{
          api: module(),
          api_key: String.t(),
          user: String.t(),
          auto_refresh: boolean(),
          refresh_interval: pos_integer(),
          user_agent: String.t()
        }

  defstruct api: LastFm.Api,
            api_key: "",
            user: "",
            auto_refresh: true,
            refresh_interval: 60_000,
            user_agent: "change me"

  @spec resolve(atom) :: t
  def resolve(otp_app) do
    app_config = Application.get_env(otp_app, LastFm)

    struct(__MODULE__, app_config)
  end
end