# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only

defmodule Pleroma.Workers.WorkerHelper do
  alias Pleroma.Config
  alias Pleroma.Workers.WorkerHelper

  def worker_args(queue) do
    case Config.get([:workers, :retries, queue]) do
      nil -> []
      max_attempts -> [max_attempts: max_attempts]
    end
  end

  def sidekiq_backoff(attempt, pow \\ 4, base_backoff \\ 15) do
    backoff =
      :math.pow(attempt, pow) +
        base_backoff +
        :rand.uniform(2 * base_backoff) * attempt

    trunc(backoff)
  end

  defmacro __using__(opts) do
    caller_module = __CALLER__.module
    queue = Keyword.fetch!(opts, :queue)
    queue_system = Config.get([:queue, :module])

    case queue_system do
      Oban ->
        quote do
          # Note: `max_attempts` is intended to be overridden in `new/2` call
          use Oban.Worker,
            queue: unquote(queue),
            max_attempts: 1

          alias Oban.Job

          def enqueue(op, params, worker_args \\ []) do
            params = Map.merge(%{"op" => op}, params)
            queue_atom = String.to_atom(unquote(queue))
            worker_args = worker_args ++ WorkerHelper.worker_args(queue_atom)

            unquote(caller_module)
            |> apply(:new, [params, worker_args])
            |> Oban.insert()
          end

          @impl Oban.Worker
          def timeout(_job) do
            queue_atom = String.to_atom(unquote(queue))
            Config.get([:workers, :timeout, queue_atom], :timer.minutes(1))
          end
        end

      Pleroma.Broadway ->
        quote do
          @topic unquote(queue)
          use Oban.Worker,
            queue: unquote(queue),
            max_attempts: 1

          alias Oban.Job

          def enqueue(op, params, worker_args \\ []) do
            worker = to_string(__MODULE__)

            params =
              params
              |> Map.put("__module__", worker)
              |> Map.put("op", op)

            Pleroma.Broadway.produce(unquote(queue), Jason.encode!(params), worker_args)
          end
        end
    end
  end
end