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defmodule Nola.Plugins.Untappd do

  def irc_doc() do
    """
    # [Untappd](https://untappd.com)

    * `!beer <beer name>` Information about the first beer matching `<beer name>`
    * `?beer <beer name>` List the 10 firsts beer matching `<beer name>`

    _Note_: The best way to search is always "Brewery Name + Beer Name", such as "Dogfish 60 Minute".

    Link your Untappd account to the bot (for automated checkins on [alcoolog](#alcoolog), ...) with the `enable-untappd` command, in private.
    """
  end

  def start_link() do
    GenServer.start_link(__MODULE__, [], name: __MODULE__)
  end

  def init(_) do
    {:ok, _} = Registry.register(Nola.PubSub, "trigger:beer", [plugin: __MODULE__])
    {:ok, %{}}
  end

  def handle_info({:irc, :trigger, _, m = %IRC.Message{trigger: %{type: :bang, args: args}}}, state) do
    case Untappd.search_beer(Enum.join(args, " "), limit: 1) do
      {:ok, %{"response" => %{"beers" => %{"count" => count, "items" => [result | _]}}}} ->
        %{"beer" => beer, "brewery" => brewery} = result
        description = Map.get(beer, "beer_description")
                      |> String.replace("\n", " ")
                      |> String.replace("\r", " ")
                      |> String.trim()
        beer_s = "#{Map.get(brewery, "brewery_name")}: #{Map.get(beer, "beer_name")} - #{Map.get(beer, "beer_abv")}°"
        city = get_in(brewery, ["location", "brewery_city"])
        location = [Map.get(brewery, "brewery_type"), city, Map.get(brewery, "country_name")]
                   |> Enum.filter(fn(x) -> x end)
                   |> Enum.join(", ")
        extra = "#{Map.get(beer, "beer_style")} - IBU: #{Map.get(beer, "beer_ibu")} - #{location}"
        m.replyfun.([beer_s, extra, description])
      err ->
        m.replyfun.("Error")
    end
    {:noreply, state}
  end


  def handle_info({:irc, :trigger, _, m = %IRC.Message{trigger: %{type: :query, args: args}}}, state) do
    case Untappd.search_beer(Enum.join(args, " ")) do
      {:ok, %{"response" => %{"beers" => %{"count" => count, "items" => results}}}} ->
        beers = for %{"beer" => beer, "brewery" => brewery} <- results do
          "#{Map.get(brewery, "brewery_name")}: #{Map.get(beer, "beer_name")} - #{Map.get(beer, "beer_abv")}°"
        end
        |> Enum.intersperse(", ")
        |> Enum.join("")
        m.replyfun.("#{count}. #{beers}")
      err ->
        m.replyfun.("Error")
    end
    {:noreply, state}
  end

  def handle_info(info, state) do
    {:noreply, state}
  end

end