defmodule Elixium.Utxo do
  alias Elixium.Utxo

  defstruct [:addr, :amount, :txoid]

  @moduledoc """
    Functionality specific to UTXOs
  """

  @doc """
    Takes in a utxo received from a peer which may have malicious or extra
    attributes attached. Removes all extra parameters which are not defined
    explicitly by the utxo struct.
  """
  @spec sanitize(Utxo) :: Utxo
  def sanitize(unsanitized_utxo) do
    struct(Utxo, Map.delete(unsanitized_utxo, :__struct__))
  end

  @doc """
    Returns a hash representation of a given utxo (to be used as an input for
    signature)
  """
  @spec hash(Utxo) :: binary
  def hash(utxo) do
    :crypto.hash(:sha256, [utxo.txoid, utxo.addr, :erlang.term_to_binary(utxo.amount)])
  end
end