defmodule Exdns.HttpCodec do
  @moduledoc false

  alias Exdns.HttpCodec.Record

  def name_from_string(name) do
    name
    |> String.trim(".")
    |> String.split(".", trim: true)
  end

  def name_to_string(labels) when is_list(labels), do: Enum.join(labels, ".")

  def decode_records(%{"records" => records}, zone_name) when is_list(records) do
    records
    |> Enum.reduce_while([], fn record, acc ->
      case Record.decode(record, zone_name) do
        {:ok, rr} -> {:cont, [rr | acc]}
        {:error, reason} -> {:halt, {:error, reason}}
      end
    end)
    |> case do
      {:error, _} = error -> error
      list -> {:ok, Enum.reverse(list)}
    end
  end

  def decode_records(_, _zone_name), do: {:error, "invalid_body"}

  def encode_records(records), do: Enum.map(records, &Record.encode/1)
end