defmodule RsTwitter.Response do
  @moduledoc """
  Keeps authentication data for the request
  """
  @enforce_keys [:status_code, :body, :headers]
  defstruct status_code: nil, body: nil, headers: []

  @type t :: %RsTwitter.Response{status_code: integer(), body: String.t(), headers: list()}

  import RsTwitter.Http.Headers, only: [fetch_header: 2]

  @doc """
  Check if response is successfull
  """
  def success?(response = %RsTwitter.Response{}) do
    response.status_code == 200
  end

  @doc """
  Defines the number of requests left for the 15 minute window
  """
  def rate_limit_remaining(response = %RsTwitter.Response{}) do
    remainging = fetch_header(response.headers, "x-rate-limit-remaining")
    if remainging, do: String.to_integer(remainging), else: nil
  end

  @doc """
  Defines the remaining window before the rate limit resets, in UTC epoch seconds
  """
  def rate_limit_reset(response = %RsTwitter.Response{}) do
    remainging = fetch_header(response.headers, "x-rate-limit-reset")
    if remainging, do: DateTime.from_unix!(String.to_integer(remainging)), else: nil
  end

  @doc """
  Defines if response has error code
  """
  def has_error_code?(response = %RsTwitter.Response{}, code) when is_integer(code) do
    has_error_code?(response, [code])
  end

  @doc """
  Defines if response has any of errors codes
  """
  def has_error_code?(%RsTwitter.Response{body: %{"errors" => errors}}, codes)
      when is_list(codes) do
    error =
      Enum.find(errors, fn error ->
        Enum.member?(codes, error["code"])
      end)

    !is_nil(error)
  end

  def has_error_code?(_, _), do: false
end