defmodule LSG.AuthToken do
  use GenServer

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

  def lookup(id) do
    GenServer.call(__MODULE__, {:lookup, id})
  end

  def new_path(account, perks \\ nil) do
    case new(account, perks) do
      {:ok, id} ->
        LSGWeb.Router.Helpers.login_path(LSGWeb.Endpoint, :token, id)
      error ->
        error
    end
  end

  def new_url(account, perks \\ nil) do
    case new(account, perks) do
      {:ok, id} ->
        LSGWeb.Router.Helpers.login_url(LSGWeb.Endpoint, :token, id)
      error ->
        error
    end
  end

  def new(account, perks \\ nil) do
    GenServer.call(__MODULE__, {:new, account, perks})
  end

  def init(_) do
    {:ok, Map.new}
  end

  def handle_call({:lookup, id}, _, state) do
    IO.inspect(state)
    with \
      {account, date, perks} <- Map.get(state, id),
      d when d > 0 <- DateTime.diff(date, DateTime.utc_now())
    do
      {:reply, {:ok, account, perks}, Map.delete(state, id)}
    else
      x ->
        IO.inspect(x)
        {:reply, {:error, :invalid_token}, state}
    end
  end

  def handle_call({:new, account, perks}, _, state) do
    id = IRC.UserTrack.Id.token()
    expire = DateTime.utc_now()
             |> DateTime.add(15*60, :second)
    {:reply, {:ok, id}, Map.put(state, id, {account, expire, perks})}
  end

end