defmodule DDG.Query do
  @moduledoc """
  Functionality for querying for the DuckDuckGo Instant Answer API.
  """
 
  @api_url "https://api.duckduckgo.com/?q="
  @fields ["Abstract", "AbstractSource", "AbstractText", "AbstractURL", "Answer",
 "AnswerType", "Definition", "DefinitionSource", "DefinitionURL", "Entity",
 "Heading", "Image", "ImageHeight", "ImageIsLogo", "ImageWidth", "Infobox",
 "Redirect", "RelatedTopics", "Results", "Type", "meta"]
  
  def query(query, safe \\ true, html \\ false) do

    get_json(query)
    |> Poison.decode!
    |> Map.take(@fields)
    |> Enum.map(fn({k, v}) -> {String.to_atom(k), v} end)
  end

  defp get_json(query) do
    url = @api_url <> query <> "&format=json"
    |> HTTPoison.get!
    url.body
  end

end