# test/foundation/mabeam/coordination_test.exs
defmodule Foundation.MABEAM.CoordinationTest do
  use ExUnit.Case, async: false
  
  alias Foundation.MABEAM.{Coordination, Types}
  
  setup do
    start_supervised!(Foundation.MABEAM.Core)
    start_supervised!(Foundation.MABEAM.AgentRegistry)
    start_supervised!(Coordination)
    :ok
  end
  
  describe "coordination protocol registration" do
    test "registers coordination protocol" do
      protocol = create_simple_protocol()
      assert :ok = Coordination.register_protocol(:simple_consensus, protocol)
      
      {:ok, protocols} = Coordination.list_protocols()
      assert :simple_consensus in Enum.map(protocols, fn {name, _} -> name end)
    end
    
    test "rejects invalid protocol" do
      invalid_protocol = %{invalid: :protocol}
      assert {:error, _reason} = Coordination.register_protocol(:invalid, invalid_protocol)
    end
  end
  
  describe "basic coordination" do
    test "coordinates with empty agent list" do
      assert {:ok, []} = Coordination.coordinate(:simple_consensus, [], %{})
    end
    
    test "coordinates with single agent" do
      agent_id = :single_agent
      register_test_agent(agent_id)
      
      assert {:ok, results} = Coordination.coordinate(:simple_consensus, [agent_id], %{decision: :test})
      assert length(results) == 1
    end
  end
end

# lib/foundation/mabeam/coordination.ex
defmodule Foundation.MABEAM.Coordination do
  @moduledoc """
  Basic coordination protocols for multi-agent variable optimization.
  
  Provides fundamental coordination mechanisms including consensus,
  negotiation, and conflict resolution for MABEAM agents.
  """
  
  use GenServer
  use Foundation.Services.ServiceBehaviour
  
  alias Foundation.{Events, Telemetry}
  alias Foundation.MABEAM.{Core, AgentRegistry, Types}
  
  @type coordination_state :: %{
    protocols: %{atom() => coordination_protocol()},
    active_coordinations: %{reference() => coordination_session()},
    metrics: coordination_metrics()
  }
  
  @type coordination_protocol :: %{
    name: atom(),
    type: protocol_type(),
    algorithm: coordination_algorithm(),
    timeout: pos_integer(),
    retry_policy: retry_policy()
  }
  
  @type protocol_type :: :consensus | :negotiation | :auction | :market
  @type coordination_algorithm :: (coordination_request() -> coordination_result())
  
  ## Public API
  
  @spec start_link(keyword()) :: GenServer.on_start()
  def start_link(opts \\ []) do
    GenServer.start_link(__MODULE__, opts, name: __MODULE__)
  end
  
  @spec register_protocol(atom(), coordination_protocol()) :: :ok | {:error, term()}
  def register_protocol(name, protocol) do
    GenServer.call(__MODULE__, {:register_protocol, name, protocol})
  end
  
  @spec coordinate(atom(), [atom()], map()) :: {:ok, [coordination_result()]} | {:error, term()}
  def coordinate(protocol_name, agent_ids, context) do
    GenServer.call(__MODULE__, {:coordinate, protocol_name, agent_ids, context})
  end
  
  @spec list_protocols() :: {:ok, [{atom(), coordination_protocol()}]}
  def list_protocols() do
    GenServer.call(__MODULE__, :list_protocols)
  end
  
  ## GenServer Implementation
  
  @impl true
  def init(opts) do
    case Foundation.Services.ServiceRegistry.register_service(__MODULE__, opts) do
      :ok ->
        state = initialize_coordination_state(opts)
        register_default_protocols(state)
        setup_telemetry()
        {:ok, state}
      
      {:error, reason} ->
        {:stop, reason}
    end
  end
  
  @impl true
  def handle_call({:register_protocol, name, protocol}, _from, state) do
    case Types.validate_coordination_protocol(protocol) do
      {:ok, validated_protocol} ->
        new_state = %{state | 
          protocols: Map.put(state.protocols, name, validated_protocol)
        }
        emit_protocol_registered_event(name, validated_protocol)
        {:reply, :ok, new_state}
      
      {:error, reason} ->
        {:reply, {:error, reason}, state}
    end
  end
  
  @impl true
  def handle_call({:coordinate, protocol_name, agent_ids, context}, _from, state) do
    case Map.get(state.protocols, protocol_name) do
      nil ->
        {:reply, {:error, :protocol_not_found}, state}
      
      protocol ->
        coordination_ref = make_ref()
        start_time = System.monotonic_time()
        
        result = execute_coordination(protocol, agent_ids, context, coordination_ref)
        
        emit_coordination_completed_event(protocol_name, agent_ids, result, start_time)
        {:reply, result, state}
    end
  end
  
  # ... additional GenServer callbacks
end

describe "simple consensus" do
  test "achieves majority consensus" do
    agents = [:agent1, :agent2, :agent3]
    Enum.each(agents, &register_test_agent/1)
    
    # Mock agent responses: 2 vote for :option_a, 1 for :option_b
    mock_agent_responses(%{
      agent1: :option_a,
      agent2: :option_a,
      agent3: :option_b
    })
    
    {:ok, result} = Coordination.coordinate(:simple_consensus, agents, %{
      question: "Which option?",
      options: [:option_a, :option_b]
    })
    
    assert result.consensus == :option_a
    assert result.vote_count == 2
    assert result.total_votes == 3
  end
  
  test "handles consensus timeout" do
    agents = [:slow_agent1, :slow_agent2]
    Enum.each(agents, &register_slow_agent/1)
    
    {:ok, result} = Coordination.coordinate(:simple_consensus, agents, %{
      question: "Test question",
      timeout: 100  # Very short timeout
    })
    
    assert result.status == :timeout
    assert result.partial_votes >= 0
  end
end

describe "basic negotiation" do
  test "negotiates resource allocation" do
    agents = [:resource_agent1, :resource_agent2]
    Enum.each(agents, &register_resource_agent/1)
    
    {:ok, result} = Coordination.coordinate(:basic_negotiation, agents, %{
      resource: :cpu_time,
      total_available: 100,
      initial_requests: %{resource_agent1: 60, resource_agent2: 50}
    })
    
    assert result.status == :agreement
    assert result.final_allocation.resource_agent1 + result.final_allocation.resource_agent2 <= 100
  end
  
  test "detects negotiation deadlock" do
    agents = [:stubborn_agent1, :stubborn_agent2]
    Enum.each(agents, &register_stubborn_agent/1)
    
    {:ok, result} = Coordination.coordinate(:basic_negotiation, agents, %{
      resource: :memory,
      max_rounds: 5
    })
    
    assert result.status == :deadlock
    assert result.rounds == 5
  end
end

describe "conflict resolution" do
  test "resolves resource conflicts" do
    agents = [:greedy_agent1, :greedy_agent2]
    Enum.each(agents, &register_greedy_agent/1)
    
    conflict = %{
      type: :resource_conflict,
      resource: :network_bandwidth,
      conflicting_requests: %{
        greedy_agent1: 80,
        greedy_agent2: 70
      },
      available: 100
    }
    
    {:ok, resolution} = Coordination.resolve_conflict(conflict, strategy: :priority_based)
    
    assert resolution.status == :resolved
    assert resolution.allocation.greedy_agent1 + resolution.allocation.greedy_agent2 <= 100
  end
end