defmodule VavPipeline.Step30.SanhedrinStressTest do
  @moduledoc """
  Step 30: Stress test Sanhedrin with complex cases.

  Architecture §4, Step 30:
  Submit multiple cases of varying complexity to the Sanhedrin.
  The Sanhedrin engine (Erlang) may not be running in dev —
  the SanhedrinClient gracefully degrades to teiku.

  This test verifies:
  1. The client handles multiple submissions without crashing
  2. Case refs are unique across submissions
  3. Complex cases with rich context are accepted
  4. The system degrades gracefully when Sanhedrin is unavailable
  5. Decision structure is consistent regardless of outcome
  """

  use ExUnit.Case, async: false

  alias VavPipeline.SanhedrinClient

  # ============================================================
  # Basic submission stress
  # ============================================================
  describe "multiple case submissions" do
    test "submits 10 cases without crashing" do
      results =
        Enum.map(1..10, fn i ->
          SanhedrinClient.submit_case(%{
            case_ref: "stress_test_#{i}",
            complexity: :simple,
            question: "Test case #{i}: is this permissible?",
            context: %{test: true, iteration: i},
            requested_by: "stress_test"
          })
        end)

      # All should return {:ok, _} — either a real decision or teiku stub
      Enum.each(results, fn result ->
        assert {:ok, decision} = result
        assert Map.has_key?(decision, :case_ref)
        assert Map.has_key?(decision, :outcome)
      end)
    end

    test "case refs are preserved in decisions" do
      refs = Enum.map(1..5, fn i -> "ref_check_#{i}" end)

      results =
        Enum.map(refs, fn ref ->
          {:ok, decision} =
            SanhedrinClient.submit_case(%{
              case_ref: ref,
              question: "Reference preservation test"
            })

          decision
        end)

      returned_refs = Enum.map(results, & &1.case_ref)

      Enum.each(refs, fn ref ->
        assert ref in returned_refs
      end)
    end
  end

  # ============================================================
  # Complex case structures
  # ============================================================
  describe "complex case handling" do
    test "submits case with rich context" do
      {:ok, decision} =
        SanhedrinClient.submit_case(%{
          case_ref: "complex_context_case",
          complexity: :simple,
          question: "When Shabbat prohibition (Shemot 35:3) conflicts with pikuach nefesh (Vayikra 18:5), which takes precedence for non-life-threatening conditions?",
          context: %{
            torah_refs: ["Shemot 35:3", "Vayikra 18:5", "Devarim 4:9"],
            roots_involved: ["שבת", "אש", "חיי", "נפש"],
            domain: :halacha,
            prior_rulings: ["Yoma 85b"],
            complexity_factors: [
              "competing_positive_negative",
              "degree_of_danger_ambiguous",
              "multiple_torah_sources"
            ]
          },
          requested_by: "stress_test"
        })

      assert decision.case_ref == "complex_context_case"
      assert decision.outcome in [:accepted, :rejected, :teiku]
    end

    test "submits case with minimal fields" do
      {:ok, decision} =
        SanhedrinClient.submit_case(%{
          question: "Minimal case — does the system handle defaults?"
        })

      assert Map.has_key?(decision, :outcome)
      assert Map.has_key?(decision, :panel_size)
    end

    test "submits case with complex context but simple complexity" do
      # NOTE: escalation.erl currently only handles :simple complexity.
      # Complex cases are a Phase 4 Step 21 refinement (Mistral fine-tuning).
      # For now, we verify that cases with rich context are handled at :simple.
      result =
        SanhedrinClient.submit_case(%{
          case_ref: "rich_context_case",
          complexity: :simple,
          question: "Rich context case — handled at simple complexity",
          context: %{
            torah_refs: ["Shemot 35:3", "Vayikra 18:5"],
            roots_involved: ["שבת", "חיי"],
            domain: :halacha
          }
        })

      assert {:ok, decision} = result
      assert decision.case_ref == "rich_context_case"
    end
  end

  # ============================================================
  # Decision structure consistency
  # ============================================================
  describe "decision structure" do
    test "every decision has required fields" do
      cases = [
        %{case_ref: "struct_1", complexity: :simple, question: "Simple?"},
        %{case_ref: "struct_2", complexity: :simple, question: "Another simple?"},
        %{case_ref: "struct_3", question: "Default complexity?"}
      ]

      Enum.each(cases, fn params ->
        {:ok, decision} = SanhedrinClient.submit_case(params)

        assert Map.has_key?(decision, :case_ref)
        assert Map.has_key?(decision, :outcome)
        assert Map.has_key?(decision, :majority)
        assert Map.has_key?(decision, :minority)
        assert Map.has_key?(decision, :panel_size)
        assert Map.has_key?(decision, :deliberation_time_ms)
        assert Map.has_key?(decision, :unanimous_check)
      end)
    end

    test "majority and minority have position and reasoning" do
      {:ok, decision} =
        SanhedrinClient.submit_case(%{
          case_ref: "majority_minority_check",
          question: "Check majority/minority structure"
        })

      assert Map.has_key?(decision.majority, :position)
      assert Map.has_key?(decision.majority, :reasoning)
      assert Map.has_key?(decision.minority, :position)
      assert Map.has_key?(decision.minority, :reasoning)
    end
  end

  # ============================================================
  # Graceful degradation
  # ============================================================
  describe "graceful degradation" do
    test "returns teiku when Sanhedrin engine is not running" do
      # In dev/test, the Sanhedrin Erlang app may not be fully running.
      # The client should return teiku, not crash.
      {:ok, decision} =
        SanhedrinClient.submit_case(%{
          case_ref: "degradation_test",
          question: "Does the system degrade gracefully?"
        })

      # Either a real decision or a teiku — both are valid
      assert decision.outcome in [:accepted, :rejected, :teiku]
    end

    test "rapid-fire submissions do not crash" do
      # Submit 20 cases as fast as possible
      tasks =
        Enum.map(1..20, fn i ->
          Task.async(fn ->
            SanhedrinClient.submit_case(%{
              case_ref: "rapid_#{i}",
              question: "Rapid fire test #{i}"
            })
          end)
        end)

      results = Task.await_many(tasks, 30_000)

      Enum.each(results, fn result ->
        assert {:ok, _} = result
      end)
    end
  end
end