defmodule VavPipeline.Tablet32ReferenceTest do
  @moduledoc """
  Tablet 32 (2026-10-04) — `devarim 6:5` on the live pod: 422
  TEIKU_NO_ROOTS. The scope was heard (tablet 30), but the Shoresh Engine
  activates roots from the text it is handed, it was handed the question,
  and a bare reference has no Hebrew in it.

  `tablet30_scope_test` asserted "an explicit reference is honoured" and
  passed — on the L1 fallback, which reads the scoped verse and never
  looks at the question. The Day-6 pattern, again: green here, broken
  where the engine is real.

  So this file does not run the fallback. Like `day6_serving_test`, it
  registers a process under the REAL name `VavPipeline.ShoreshEnginePort`
  that behaves the way the engine behaves — roots only from Hebrew it is
  given — and it reports back exactly what text it was given.
  """

  use ExUnit.Case, async: false

  import Plug.Test
  import Plug.Conn

  alias VavPipeline.{HaltMonitor, L1Reader, MannaLedger}
  alias VavPipeline.BigdeiKodesh.Router

  @opts Router.init([])

  # ============================================================
  # An engine-shaped stand-in that tells the test what it was handed
  # ============================================================
  defmodule SpyPort do
    use GenServer

    def start(test_pid),
      do: GenServer.start(__MODULE__, test_pid, name: VavPipeline.ShoreshEnginePort)

    @impl true
    def init(test_pid), do: {:ok, test_pid}

    @impl true
    def handle_call({:request, json_line}, _from, test_pid) do
      text = json_line |> Jason.decode!() |> get_in(["input", "text"]) || ""
      send(test_pid, {:engine_received, text})

      roots =
        cond do
          # Devarim 6:5 opens וְאָהַבְתָּ — the engine would find א-ה-ב.
          String.contains?(text, "ואהבת") -> [root(["aleph", "he", "bet"], "אהב", 8)]
          String.match?(text, ~r/[\x{05D0}-\x{05EA}]/u) -> [root(["bet", "resh", "aleph"], "ברא", 203)]
          true -> []
        end

      {:reply, {:ok, %{"roots_activated" => roots, "parse_tree" => nil, "dual_readings" => []}},
       test_pid}
    end

    # The engine's root shape as the pod delivers it: string keys, no `position`.
    defp root(letters, hebrew, gematria) do
      %{
        "shoresh" => letters,
        "shoresh_hebrew" => hebrew,
        "gematria_value" => gematria,
        "binyan" => "Qal",
        "domain" => "unknown",
        "torah_refs" => [],
        "neighbors" => [],
        "gematria_neighbors" => []
      }
    end
  end

  setup do
    if HaltMonitor.halted?(), do: HaltMonitor.resolve("tablet32 test setup")
    write_provision(50)

    # This file is about the real-engine path. If a real engine is
    # registered on this host there is nothing to stand in for.
    assert Process.whereis(VavPipeline.ShoreshEnginePort) == nil,
           "a real ShoreshEnginePort is registered; this test needs to spy on the port"

    {:ok, pid} = SpyPort.start(self())
    on_exit(fn -> if Process.alive?(pid), do: GenServer.stop(pid) end)
    :ok
  end

  describe "a named verse, no Hebrew in the question" do
    test "the engine is handed the verse's own words, and the ger is answered" do
      conn = post_ask("devarim 6:5")
      body = Jason.decode!(conn.resp_body)

      {:ok, verse} = L1Reader.read_verse("devarim", 6, 5)
      verse_text = Enum.map_join(verse.words, " ", & &1.consonants)

      assert_received {:engine_received, ^verse_text}
      assert verse_text =~ "ואהבת"

      assert conn.status == 200, "#{conn.status} #{conn.resp_body}"
      assert [%{"ref" => "Devarim 6:5"}] = body["sources"]
      assert body["processing"]["scope"]["resolved_by"] == "verse_reference"
      assert body["processing"]["scope"]["roots_read_from"] == "verse"
      assert body["processing"]["roots_consulted"] != []
      assert body["answer"] =~ "Devarim 6:5"
    end

    test "English around the reference changes nothing" do
      conn = post_ask("What does Deuteronomy 6:5 command?")
      body = Jason.decode!(conn.resp_body)

      assert_received {:engine_received, text}
      assert text =~ "ואהבת"
      assert conn.status == 200
      assert body["processing"]["scope"]["roots_read_from"] == "verse"
    end
  end

  describe "what must NOT be handed the verse" do
    test "no reference, no Hebrew: the default scope earns no reading — still a teiku" do
      conn = post_ask("Test query 1")
      body = Jason.decode!(conn.resp_body)

      assert_received {:engine_received, "Test query 1"}
      assert conn.status == 422
      assert body["error"]["code"] == "TEIKU_NO_ROOTS"
    end

    test "quoted Torah: the engine reads the asker's own words" do
      conn = post_ask("ויאמר אלהים יהי אור")
      body = Jason.decode!(conn.resp_body)

      assert_received {:engine_received, "ויאמר אלהים יהי אור"}
      assert conn.status == 200
      assert body["processing"]["scope"]["resolved_by"] == "text_match"
      assert body["processing"]["scope"]["roots_read_from"] == "question"
    end

    test "a reference WITH Hebrew: the asker's Hebrew is what is read" do
      q = "devarim 6:5 — ואהבת"
      conn = post_ask(q)
      body = Jason.decode!(conn.resp_body)

      assert_received {:engine_received, ^q}
      assert conn.status == 200
      assert body["processing"]["scope"]["resolved_by"] == "verse_reference"
      assert body["processing"]["scope"]["roots_read_from"] == "question"
    end
  end

  # ------------------------------------------------------------
  # Helpers (shape from day6_serving_test.exs / tablet30_scope_test.exs)
  # ------------------------------------------------------------

  defp write_provision(compute_units) do
    MannaLedger.reset()
    on_exit(fn -> MannaLedger.reset() end)
    today = Date.utc_today() |> Date.to_iso8601()
    expires = DateTime.utc_now() |> DateTime.add(6 * 3600) |> DateTime.to_iso8601()

    provision = %{
      "date" => today,
      "provision" => %{
        "compute_units" => compute_units,
        "memory_mb" => 512,
        "api_calls_external" => 5,
        "storage_delta_mb" => 2,
        "sanhedrin_panels_max" => 2
      },
      "type" => "regular",
      "expires_at" => expires,
      "written_by" => "tablet32_test",
      "written_at" => DateTime.utc_now() |> DateTime.to_iso8601()
    }

    path = VavPipeline.Manna.provision_file()
    File.mkdir_p!(Path.dirname(path))
    File.write!(path, Jason.encode!(provision))
    on_exit(fn -> File.rm(path) end)
    path
  end

  defp post_ask(question) do
    conn(:post, "/peah/ask", Jason.encode!(%{question: question}))
    |> put_req_header("content-type", "application/json")
    |> Router.call(@opts)
  end
end