defmodule VavPipeline.ChatzotzrotTest do
  @moduledoc """
  Tests for the Chatzotzrot signaling system.

  Bamidbar 10:2 — Aseh lekha shtei chatzotz'rot kesef,
  mikshah ta'aseh otam.

  "Make for yourself two trumpets of silver;
  of hammered work you shall make them."

  Five signals. Five patterns. Routing by recipient group.
  Every signal recorded in the zikaron (remembrance).
  """

  use ExUnit.Case, async: false

  alias VavPipeline.Chatzotzrot

  # ============================================================
  # Signal Type → Pattern Mapping (Bamidbar 10, Architecture §3.12)
  # ============================================================
  describe "signal patterns" do
    test "assembly_all → tekiah" do
      signal = Chatzotzrot.signal(:assembly_all)
      assert signal.signal_type == :assembly_all
      assert signal.pattern == :tekiah
      assert signal.source == :chatzotzrot
      assert signal.timestamp != nil
    end

    test "assembly_leaders → teruah" do
      signal = Chatzotzrot.signal(:assembly_leaders)
      assert signal.signal_type == :assembly_leaders
      assert signal.pattern == :teruah
    end

    test "breaking_camp → tekiah_teruah" do
      signal = Chatzotzrot.signal(:breaking_camp)
      assert signal.signal_type == :breaking_camp
      assert signal.pattern == :tekiah_teruah
    end

    test "war → teruah_teruah" do
      signal = Chatzotzrot.signal(:war)
      assert signal.signal_type == :war
      assert signal.pattern == :teruah_teruah
    end

    test "moadim → tekiah_tekiah" do
      signal = Chatzotzrot.signal(:moadim)
      assert signal.signal_type == :moadim
      assert signal.pattern == :tekiah_tekiah
    end
  end

  # ============================================================
  # Urgency (Construction §3.5)
  # ============================================================
  describe "urgency" do
    test "breaking_camp is immediate" do
      signal = Chatzotzrot.signal(:breaking_camp)
      assert signal.details.urgency == :immediate
    end

    test "war is immediate" do
      signal = Chatzotzrot.signal(:war)
      assert signal.details.urgency == :immediate
    end

    test "assembly_all is next_cycle" do
      signal = Chatzotzrot.signal(:assembly_all)
      assert signal.details.urgency == :next_cycle
    end

    test "assembly_leaders is informational" do
      signal = Chatzotzrot.signal(:assembly_leaders)
      assert signal.details.urgency == :informational
    end

    test "moadim is informational" do
      signal = Chatzotzrot.signal(:moadim)
      assert signal.details.urgency == :informational
    end

    test "urgency can be overridden" do
      signal = Chatzotzrot.signal(:moadim, urgency: :immediate)
      assert signal.details.urgency == :immediate
    end
  end

  # ============================================================
  # Custom reason (Construction §3.5)
  # ============================================================
  describe "reason" do
    test "default reason is the signal type name" do
      signal = Chatzotzrot.signal(:war)
      assert signal.details.reason == "war"
    end

    test "custom reason is preserved" do
      signal = Chatzotzrot.signal(:war, reason: "DDoS detected on API layer")
      assert signal.details.reason == "DDoS detected on API layer"
    end
  end

  # ============================================================
  # Subscription and Routing (Architecture §3.12)
  # ============================================================
  describe "subscription and routing" do
    test "subscriber to :all receives assembly_all signal" do
      Chatzotzrot.subscribe(:all)
      Chatzotzrot.signal(:assembly_all)

      assert_receive {:chatzotzrot, %{signal_type: :assembly_all, pattern: :tekiah}}
    end

    test "subscriber to :all receives breaking_camp signal" do
      Chatzotzrot.subscribe(:all)
      Chatzotzrot.signal(:breaking_camp)

      assert_receive {:chatzotzrot, %{signal_type: :breaking_camp, pattern: :tekiah_teruah}}
    end

    test "subscriber to :all receives moadim signal" do
      Chatzotzrot.subscribe(:all)
      Chatzotzrot.signal(:moadim)

      assert_receive {:chatzotzrot, %{signal_type: :moadim, pattern: :tekiah_tekiah}}
    end

    test "subscriber to :all does NOT receive assembly_leaders" do
      Chatzotzrot.subscribe(:all)
      Chatzotzrot.signal(:assembly_leaders)

      refute_receive {:chatzotzrot, %{signal_type: :assembly_leaders}}, 100
    end

    test "subscriber to :all does NOT receive war" do
      Chatzotzrot.subscribe(:all)
      Chatzotzrot.signal(:war)

      refute_receive {:chatzotzrot, %{signal_type: :war}}, 100
    end

    test "subscriber to :kohanim receives assembly_leaders" do
      Chatzotzrot.subscribe(:kohanim)
      Chatzotzrot.signal(:assembly_leaders)

      assert_receive {:chatzotzrot, %{signal_type: :assembly_leaders, pattern: :teruah}}
    end

    test "subscriber to :kohanim receives war" do
      Chatzotzrot.subscribe(:kohanim)
      Chatzotzrot.signal(:war)

      assert_receive {:chatzotzrot, %{signal_type: :war, pattern: :teruah_teruah}}
    end

    test "subscriber to :operators receives war" do
      Chatzotzrot.subscribe(:operators)
      Chatzotzrot.signal(:war)

      assert_receive {:chatzotzrot, %{signal_type: :war, pattern: :teruah_teruah}}
    end

    test "subscriber to :operators does NOT receive assembly_all" do
      Chatzotzrot.subscribe(:operators)
      Chatzotzrot.signal(:assembly_all)

      refute_receive {:chatzotzrot, _}, 100
    end

    test "process subscribed to multiple groups receives signal once" do
      # War routes to both :operators and :kohanim
      Chatzotzrot.subscribe(:operators)
      Chatzotzrot.subscribe(:kohanim)
      Chatzotzrot.signal(:war)

      assert_receive {:chatzotzrot, %{signal_type: :war}}
      refute_receive {:chatzotzrot, %{signal_type: :war}}, 100
    end

    test "unsubscribe stops signal delivery" do
      Chatzotzrot.subscribe(:all)
      Chatzotzrot.signal(:assembly_all)
      assert_receive {:chatzotzrot, %{signal_type: :assembly_all}}

      Chatzotzrot.unsubscribe(:all)
      Chatzotzrot.signal(:assembly_all)
      refute_receive {:chatzotzrot, _}, 100
    end
  end

  # ============================================================
  # Zikaron — Remembrance (Bamidbar 10:10)
  # ============================================================
  describe "zikaron (signal history)" do
    test "signals are recorded in zikaron" do
      initial_count = Chatzotzrot.count()

      Chatzotzrot.signal(:assembly_all, reason: "test zikaron")
      Chatzotzrot.signal(:war, reason: "test zikaron war")

      history = Chatzotzrot.zikaron()
      assert length(history) >= 2

      # Newest first
      [newest | _] = history
      assert newest.signal_type == :war
      assert newest.details.reason == "test zikaron war"

      assert Chatzotzrot.count() >= initial_count + 2
    end

    test "zikaron can be filtered by type" do
      Chatzotzrot.signal(:moadim, reason: "zikaron filter test")
      Chatzotzrot.signal(:war, reason: "zikaron filter test")

      moadim_history = Chatzotzrot.zikaron(type: :moadim)
      assert Enum.all?(moadim_history, &(&1.signal_type == :moadim))
    end

    test "zikaron can be limited" do
      Chatzotzrot.signal(:assembly_all)
      Chatzotzrot.signal(:assembly_all)
      Chatzotzrot.signal(:assembly_all)

      limited = Chatzotzrot.zikaron(limit: 2)
      assert length(limited) == 2
    end

    test "zikaron can be filtered and limited" do
      Chatzotzrot.signal(:moadim, reason: "combined filter 1")
      Chatzotzrot.signal(:moadim, reason: "combined filter 2")
      Chatzotzrot.signal(:moadim, reason: "combined filter 3")

      result = Chatzotzrot.zikaron(type: :moadim, limit: 1)
      assert length(result) == 1
      assert hd(result).signal_type == :moadim
    end
  end

  # ============================================================
  # Dead subscriber cleanup
  # ============================================================
  describe "dead subscriber cleanup" do
    test "dead processes are removed from subscriber list" do
      # Spawn a process that subscribes then dies
      pid =
        spawn(fn ->
          Chatzotzrot.subscribe(:all)

          receive do
            :stop -> :ok
          end
        end)

      # Give it time to subscribe
      Process.sleep(50)
      send(pid, :stop)
      Process.sleep(50)

      # Signal should not crash — dead subscriber is cleaned up
      signal = Chatzotzrot.signal(:assembly_all)
      assert signal.signal_type == :assembly_all
    end
  end

  # ============================================================
  # Construction §3.5 — signal format compliance
  # ============================================================
  describe "signal format (Construction §3.5)" do
    test "signal record has all required fields" do
      signal = Chatzotzrot.signal(:assembly_all, reason: "format test")

      assert Map.has_key?(signal, :signal_type)
      assert Map.has_key?(signal, :pattern)
      assert Map.has_key?(signal, :timestamp)
      assert Map.has_key?(signal, :source)
      assert Map.has_key?(signal, :details)
      assert Map.has_key?(signal.details, :reason)
      assert Map.has_key?(signal.details, :urgency)

      assert signal.source == :chatzotzrot
      assert is_binary(signal.timestamp)
    end
  end
end