defmodule Formular.Client.Compiler do
  @moduledoc """
  Compiler for making the string code into an Elixir module.
  """

  require Logger
  alias Formular.Client.Config

  use Agent

  def start_link(opts),
    do: Agent.start_link(fn -> MapSet.new([]) end, Keyword.put_new(opts, :name, __MODULE__))

  def handle_new_code_revision(name, code, config) do
    with {mod, name, context} <- Config.formula_config(config, name) do
      case config do
        %{compiler: {m, f, a}} ->
          apply(m, f, [{code, name, mod, context} | a])

        %{compiler: f} when is_function(f, 1) ->
          apply(f, [{code, name, mod, context}])
      end
    end
  end

  def compile({code, name, mod, context}) do
    Logger.info(["Recompiling formula: #{name} to module #{mod}. Code: #{code}"])

    Agent.update(__MODULE__, fn mapset ->
      prev_mc_config = Code.get_compiler_option(:ignore_module_conflict)
      Code.put_compiler_option(:ignore_module_conflict, true)
      Formular.compile_to_module!(code, mod, context)
      Code.put_compiler_option(:ignore_module_conflict, prev_mc_config)

      MapSet.put(mapset, {mod, name})
    end)
  end
end