defmodule GcpCompute.Disk do
  @moduledoc "Parsed `disks` entry of an instance."

  alias GcpCompute.Util

  @type t :: %__MODULE__{
          device_name: String.t() | nil,
          boot: boolean() | nil,
          auto_delete: boolean() | nil,
          source: String.t() | nil,
          size_gb: integer() | nil,
          type: String.t() | nil,
          raw: map()
        }

  defstruct [:device_name, :boot, :auto_delete, :source, :size_gb, :type, raw: %{}]

  @doc "Parse a list of decoded JSON `disks` (nil-safe)."
  @spec list(list() | nil) :: [t()]
  def list(nil), do: []
  def list(disks) when is_list(disks), do: Enum.map(disks, &from_json/1)

  @doc "Parse one decoded JSON disk map."
  @spec from_json(map()) :: t()
  def from_json(map) when is_map(map) do
    %__MODULE__{
      device_name: map["deviceName"],
      boot: map["boot"],
      auto_delete: map["autoDelete"],
      source: Util.short_name(map["source"]),
      size_gb: Util.to_integer(map["diskSizeGb"]),
      type: Util.short_name(map["type"]),
      raw: map
    }
  end
end