defmodule Microwaveprop.Workers.Era5MonthBatchWorker do
  @moduledoc """
  Legacy entry point for the ERA5 month-tile backfill. **Forwards** to
  `Era5SubmitWorker` in the new split-worker pipeline — kept in place so
  already-enqueued callers (`Era5FetchWorker`, `mix era5.backfill`, any
  in-flight Oban rows) don't need to be changed on the same deploy.

  On the next deploy cycle, callers will be updated to enqueue
  `Era5SubmitWorker` directly and this module can be removed.
  """
  use Oban.Worker,
    queue: :era5_submit,
    max_attempts: 5,
    unique: [
      period: :infinity,
      states: [:available, :scheduled, :executing, :retryable],
      keys: [:year, :month, :tile_lat, :tile_lon]
    ]

  alias Microwaveprop.Workers.Era5SubmitWorker

  require Logger

  @impl Oban.Worker
  def backoff(%Oban.Job{attempt: attempt}) do
    # Forwarding is cheap; retry fast on transient failure.
    min(30 * Integer.pow(2, attempt - 1), 3_600)
  end

  @impl Oban.Worker
  def perform(%Oban.Job{args: args}) do
    Logger.debug("Era5MonthBatchWorker forwarding to Era5SubmitWorker: #{inspect(args)}")

    args
    |> Era5SubmitWorker.new()
    |> Oban.insert()
    |> case do
      {:ok, _job} -> :ok
      {:error, reason} -> {:error, reason}
    end
  end
end