defmodule ExCoinbase.Utils do
  @moduledoc """
  Utils with responses processing
  """
  @spec response_processing({:ok, Poison.Parser.t()} | {:error, HTTPoison.Error.t()}) ::
          {:ok, {integer(), Poison.Parser.t()}} | {:error, Exception.t()} | {:error, HTTPoison.Error.t()}
  def response_processing(response) do
    case response do
      {:ok, %{body: body, status_code: status}} ->
        case Poison.decode(body) do
          {:ok, decoded} -> {:ok, {status, decoded}}
          {:error, error} -> {:error, error}
        end

      {:error, err} ->
        {:error, err}
    end
  end

  @spec build_body(struct() | map()) :: {:ok, String.t()} | {:error, Exception.t()}
  def build_body(fields) do
    Poison.encode(fields)
  end
end