elixir: google place api

elixir_google_place.ex

defmodule GooglePlaces do
  @moduledoc false
  # https://developers.google.com/places/web-service/?hl=ja

  use HTTPoison.Base

  #require Logger

  @text_search "/textsearch/json?key=<api key>"

  def process_url(url) do
    "https://maps.googleapis.com/maps/api/place" <> url
  end

  def process_response_body(body) do
    body
    |> Poison.decode!
  end

  def text_search(text) do
    case get(@text_search <> "&query=" <> URI.encode(text)) do
      {:ok, %HTTPoison.Response{status_code: 200, body: body}} ->
        {:ok, body}
      {:ok, %HTTPoison.Response{status_code: status}} ->
        {:error, "error status : " <> to_string(status)}
      {:error, %HTTPoison.Error{reason: reason}} ->
        {:error, reason}
    end
  end

  def latlon("unit test") do
    %{"lat" => 0.0, "lon" => 0.0}
  end

  def latlon(address) when is_binary(address) do
    latlng = address
    |> text_search
    |> google_latlng

    %{"lat" => latlng["lat"], "lon" => latlng["lng"]}
  end

  def latlon(_) do
    %{"lat" => 0.0, "lon" => 0.0}
  end

  defp google_latlng({:ok, result}) do
    result
    |> Map.get("results")
    |> hd
    |> Map.get("geometry")
    |> Map.get("location")
  end
end