defmodule Mix.Tasks.Calibrate.Aprs144Test do
  @moduledoc """
  Smoke test for the APRS-144 calibration mix task. The task is mostly
  orchestration: Aprs query + PathParser + Recalibrator. Each piece has
  its own unit tests, so this only confirms the wiring holds together
  and that the empty-corpus path exits via the "refusing to fit" branch
  rather than crashing.
  """
  use Microwaveprop.DataCase, async: false

  alias Ecto.Adapters.SQL.Sandbox
  alias Microwaveprop.AprsRepo
  alias Mix.Tasks.Calibrate.Aprs144

  setup do
    pid = Sandbox.start_owner!(AprsRepo, shared: true)
    on_exit(fn -> Sandbox.stop_owner(pid) end)

    original_shell = Mix.shell()
    Mix.shell(Mix.Shell.Process)
    on_exit(fn -> Mix.shell(original_shell) end)

    :ok
  end

  test "empty aprs DB walks the refuse-to-fit branch without raising" do
    output =
      ExUnit.CaptureIO.capture_io(fn ->
        # Tiny knobs so the task is fast even if it ever did reach training.
        Aprs144.run(["--since-hours", "1", "--epochs", "1", "--lr", "0.1", "--max-packets", "10"])
      end)

    # Mix.shell() messages land in the test mailbox; collect them all.
    messages = collect_mix_messages()
    combined = Enum.join(messages, "\n") <> "\n" <> output

    assert combined =~ "APRS-144 calibration"
    assert combined =~ "Pulled 0 packets"
    assert combined =~ "Refusing to fit"
  end

  defp collect_mix_messages(acc \\ []) do
    receive do
      {:mix_shell, :info, [msg]} -> collect_mix_messages([msg | acc])
    after
      0 -> Enum.reverse(acc)
    end
  end
end