defmodule StellarBase.XDR.VariableOpaque64 do
  @moduledoc """
  Representation of Stellar `VariableOpaque64` type.
  """
  @behaviour XDR.Declaration

  @type t :: %__MODULE__{opaque: binary()}

  defstruct [:opaque]

  @max_size 64

  @opaque_spec XDR.VariableOpaque.new(nil, @max_size)

  @spec new(opaque :: binary()) :: t()
  def new(opaque), do: %__MODULE__{opaque: opaque}

  @impl true
  def encode_xdr(%__MODULE__{opaque: opaque}) do
    XDR.VariableOpaque.encode_xdr(%XDR.VariableOpaque{opaque: opaque, max_size: @max_size})
  end

  @impl true
  def encode_xdr!(%__MODULE__{opaque: opaque}) do
    XDR.VariableOpaque.encode_xdr!(%XDR.VariableOpaque{opaque: opaque, max_size: @max_size})
  end

  @impl true
  def decode_xdr(bytes, spec \\ @opaque_spec)

  def decode_xdr(bytes, spec) do
    case XDR.VariableOpaque.decode_xdr(bytes, spec) do
      {:ok, {%XDR.VariableOpaque{opaque: opaque}, rest}} -> {:ok, {new(opaque), rest}}
      error -> error
    end
  end

  @impl true
  def decode_xdr!(bytes, spec \\ @opaque_spec)

  def decode_xdr!(bytes, spec) do
    {%XDR.VariableOpaque{opaque: opaque}, rest} = XDR.VariableOpaque.decode_xdr!(bytes, spec)
    {new(opaque), rest}
  end
end