defmodule Beanstream do
  @moduledoc """
  A HTTP client for Beanstream.
  """
  use HTTPoison.Base # based on HTTPoison
  require Logger

  @endpoint "https://www.beanstream.com/api/v1/"

  # Creates the URL for our endpoint.
  def process_url(path) do
    Logger.debug("request url: " <>@endpoint <> path)
    @endpoint <> path
  end

  # Static headers for all requests.
  defp process_request_headers(headers) do
    h = Enum.into(headers, [{"Content-Type", "application/json"}])
    Logger.debug("request headers: " <> inspect(h))
    h
  end

  # Encode the request as JSON.
  defp process_request_body(body) do
    b = Poison.encode!(body)
    Logger.debug("request body: " <> b)
    b
  end

  # Decode the response body as JSON.
  defp process_response_body(body) do
    Logger.debug("response body: " <> body)

    case Poison.decode(body) do
    {:ok, body} -> body
    {:error, _error} -> body
    end
  end

  # Process OK response (performed manually, not a Poison callback)
  def process_response({:ok, resp}) do
    case resp.status_code do
    200 -> {:ok, resp.body}
    _ -> Beanstream.Error.new(resp)
    end
  end

  def process_response({:error, error}) do
    Logger.error("response error: " <> inspect(error))
    {:error, error}
  end

end