defmodule Microwaveprop.Workers.PropagationGridWorkerTest do
  @moduledoc """
  Tests the Phase-3-cutover seeder behaviour.

  Elixir no longer runs the chain step; the hourly cron fires
  `perform(%Oban.Job{args: %{}})` with empty args and the worker
  inserts 19 grid_tasks rows (1 analysis f00 + 18 forecast f01..f18)
  for the Rust `prop-grid-rs` worker to drain. Rust owns HRRR fetch,
  wgrib2 decode, native duct, NEXRAD, commercial, scoring, and both
  the ProfilesFile and band score-file writes from here on out.
  """
  use Microwaveprop.DataCase, async: false
  use Oban.Testing, repo: Microwaveprop.Repo

  alias Microwaveprop.Workers.PropagationGridWorker
  alias Microwaveprop.Workers.PropagationPruneWorker

  describe "queue priority" do
    test "PropagationGridWorker runs at the highest priority on :propagation" do
      assert PropagationGridWorker.__opts__()[:priority] == 0
    end

    test "PropagationPruneWorker yields to the grid chain" do
      assert PropagationPruneWorker.__opts__()[:priority] > 0
    end
  end

  describe "perform/1 — chain seeding (empty args)" do
    test "inserts 1 analysis + 18 forecast grid_tasks rows; no Oban fan-out" do
      Oban.Testing.with_testing_mode(:manual, fn ->
        import Ecto.Query

        assert :ok = PropagationGridWorker.perform(%Oban.Job{args: %{}})

        # No chain-step Oban jobs fan out anymore — the entire chain
        # lives in grid_tasks from the Rust worker's perspective.
        jobs = all_enqueued(worker: PropagationGridWorker)
        assert jobs == []

        {_count, [first_task]} =
          "grid_tasks"
          |> Microwaveprop.Repo.insert_all(
            [],
            returning: [:run_time, :kind, :forecast_hour]
          )
          |> case do
            # When the worker seeded a run, the table has 19 fresh rows.
            # Pull the analysis row so the test can derive run_time for
            # the subsequent query.
            _ ->
              from(t in "grid_tasks",
                where: t.kind == "analysis",
                order_by: [desc: t.inserted_at],
                limit: 1,
                select: %{run_time: t.run_time, forecast_hour: t.forecast_hour, kind: t.kind}
              )
              |> Microwaveprop.Repo.all()
              |> case do
                [row] -> {1, [row]}
                _ -> {0, [%{run_time: nil, forecast_hour: nil, kind: nil}]}
              end
          end

        assert first_task.kind == "analysis"
        assert first_task.forecast_hour == 0
        run_time = first_task.run_time
        assert run_time.minute == 0
        assert run_time.second == 0

        rows =
          Microwaveprop.Repo.all(
            from t in "grid_tasks",
              where: t.run_time == ^run_time,
              select: %{fh: t.forecast_hour, kind: t.kind},
              order_by: [t.kind, t.forecast_hour]
          )

        kinds = rows |> Enum.map(& &1.kind) |> Enum.frequencies()
        assert kinds == %{"analysis" => 1, "forecast" => 18}

        forecast_fhs =
          rows |> Enum.filter(&(&1.kind == "forecast")) |> Enum.map(& &1.fh) |> Enum.sort()

        assert forecast_fhs == Enum.to_list(1..18)
      end)
    end
  end
end