defmodule LSG.IRC.CalcHandler do
  @moduledoc """
  # calc

  * **!calc `<expression>`**: évalue l'expression mathématique `<expression>`.
  """

  def irc_doc, do: @moduledoc

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

  def init([client]) do
    ExIRC.Client.add_handler client, self
    {:ok, client}
  end

  def handle_info({:received, "!calc "<>expr, %ExIRC.SenderInfo{nick: nick}, chan}, client) do
    IO.inspect "HAZ CALC " <>inspect(expr)
    result = try do
      case Abacus.eval(expr) do
        {:ok, result} -> result
        error -> inspect(error)
      end
    rescue
      error -> "#{error.message}"
    end
    ExIRC.Client.msg(client, :privmsg, chan, "#{nick}: #{expr} = #{result}")
    {:noreply, client}
  end

  def handle_info(msg, client) do
    {:noreply, client}
  end

end