defmodule Wobserver.System.Memory do
  @moduledoc ~S"""
  Handles memory information.
  """

  @typedoc ~S"""
  Memory information.
  """
  @type t :: %__MODULE__{
    atom: integer,
    binary: integer,
    code: integer,
    ets: integer,
    process: integer,
    total: integer,
  }

  defstruct [
    atom: 0,
    binary: 0,
    code: 0,
    ets: 0,
    process: 0,
    total: 0,
  ]

  @doc ~S"""
  Returns memory usage.
  """
  @spec usage :: Wobserver.System.Memory.t
  def usage do
    mem = :erlang.memory

    %__MODULE__{
      atom: Keyword.get(mem, :atom),
      binary: Keyword.get(mem, :binary),
      code: Keyword.get(mem, :code),
      ets: Keyword.get(mem, :ets),
      process: Keyword.get(mem, :processes),
      total: Keyword.get(mem, :total),
    }
  end
end