"""Phase 1 success: orchestrator + stub agents + task + message flow (no LLM)."""

from fusionagi.core import EventBus, StateManager, Orchestrator
from fusionagi.agents import PlannerAgent
from fusionagi.schemas import TaskState, AgentMessage, AgentMessageEnvelope


def test_orchestrator_register_submit_get_state() -> None:
    bus = EventBus()
    state = StateManager()
    orch = Orchestrator(event_bus=bus, state_manager=state)
    planner = PlannerAgent(identity="planner")
    orch.register_agent("planner", planner)

    task_id = orch.submit_task(goal="Test goal", constraints=[])
    assert task_id
    assert orch.get_task_state(task_id) == TaskState.PENDING

    task = orch.get_task(task_id)
    assert task is not None
    assert task.goal == "Test goal"


def test_planner_handle_message_returns_plan_ready() -> None:
    planner = PlannerAgent(identity="planner")
    envelope = AgentMessageEnvelope(
        message=AgentMessage(
            sender="orchestrator",
            recipient="planner",
            intent="plan_request",
            payload={"goal": "Do something"},
        ),
        task_id="task-1",
    )
    out = planner.handle_message(envelope)
    assert out is not None
    assert out.message.intent == "plan_ready"
    assert "plan" in out.message.payload
    steps = out.message.payload["plan"]["steps"]
    assert len(steps) == 3
    assert steps[0]["id"] == "step_1"


def test_event_bus_publish_subscribe() -> None:
    bus = EventBus()
    seen: list[tuple[str, dict]] = []
    bus.subscribe("task_created", lambda t, p: seen.append((t, p)))
    bus.publish("task_created", {"task_id": "t1", "goal": "g1"})
    assert len(seen) == 1
    assert seen[0][0] == "task_created"
    assert seen[0][1]["task_id"] == "t1"


def test_event_bus_handler_failure() -> None:
    bus = EventBus()
    seen: list[tuple[str, dict]] = []
    def good_handler(t: str, p: dict) -> None:
        seen.append((t, p))

    def bad_handler(t: str, p: dict) -> None:
        raise RuntimeError("handler failed")

    bus.subscribe("ev", good_handler)
    bus.subscribe("ev", bad_handler)
    bus.publish("ev", {"task_id": "t1"})
    assert len(seen) == 1
    assert seen[0][0] == "ev"
    assert seen[0][1]["task_id"] == "t1"


def test_event_bus_get_recent_events() -> None:
    """EventBus(history_size=N) records events; get_recent_events returns them."""
    bus = EventBus(history_size=10)
    bus.publish("task_created", {"task_id": "t1", "goal": "g1"})
    bus.publish("task_state_changed", {"task_id": "t1", "to_state": "active"})
    events = bus.get_recent_events(limit=5)
    assert len(events) == 2
    assert events[0]["event_type"] == "task_created"
    assert events[0]["payload"]["task_id"] == "t1"
    assert "timestamp" in events[0]
    assert events[1]["event_type"] == "task_state_changed"
    # Default history_size=0 returns []
    bus_default = EventBus()
    assert bus_default.get_recent_events(5) == []


def test_state_manager_task_and_trace() -> None:
    from fusionagi.schemas.task import Task, TaskState

    state = StateManager()
    task = Task(task_id="t1", goal="g1", state=TaskState.ACTIVE)
    state.set_task(task)
    assert state.get_task_state("t1") == TaskState.ACTIVE
    state.append_trace("t1", {"step": "s1", "result": "ok"})
    trace = state.get_trace("t1")
    assert len(trace) == 1
    assert trace[0]["step"] == "s1"


def test_orchestrator_set_task_state() -> None:
    bus = EventBus()
    state = StateManager()
    orch = Orchestrator(event_bus=bus, state_manager=state)
    task_id = orch.submit_task(goal="G", constraints=[])
    assert orch.get_task_state(task_id) == TaskState.PENDING
    orch.set_task_state(task_id, TaskState.ACTIVE)
    assert orch.get_task_state(task_id) == TaskState.ACTIVE


def test_orchestrator_route_message_return() -> None:
    bus = EventBus()
    state = StateManager()
    orch = Orchestrator(event_bus=bus, state_manager=state)
    planner = PlannerAgent(identity="planner")
    orch.register_agent("planner", planner)
    envelope = AgentMessageEnvelope(
        message=AgentMessage(
            sender="orch",
            recipient="planner",
            intent="plan_request",
            payload={"goal": "Do something"},
        ),
        task_id="t1",
    )
    response = orch.route_message_return(envelope)
    assert response is not None
    assert response.message.intent == "plan_ready"
    assert "plan" in response.message.payload


def test_orchestrator_unregister_removes_from_parent() -> None:
    bus = EventBus()
    state = StateManager()
    orch = Orchestrator(event_bus=bus, state_manager=state)
    planner = PlannerAgent(identity="planner")
    child = PlannerAgent(identity="child")
    orch.register_agent("planner", planner)
    orch.register_sub_agent("planner", "child", child)
    assert orch.get_sub_agents("planner") == ["child"]
    orch.unregister_agent("child")
    assert orch.get_sub_agents("planner") == []
    assert orch.get_agent("child") is None


def test_tot_multi_branch() -> None:
    """Test that Tree-of-Thought works with multiple branches."""
    from fusionagi.adapters import StubAdapter
    from fusionagi.reasoning import run_tree_of_thought

    # Create adapter that returns JSON for evaluation
    adapter = StubAdapter('{"score": 0.8, "reason": "good approach"}')
    
    # Should not raise NotImplementedError anymore
    response, trace = run_tree_of_thought(adapter, "What is 2+2?", max_branches=2)
    
    # Should return a response
    assert response is not None
    assert len(trace) > 0


if __name__ == "__main__":
    test_orchestrator_register_submit_get_state()
    test_planner_handle_message_returns_plan_ready()
    test_event_bus_publish_subscribe()
    test_event_bus_handler_failure()
    test_state_manager_task_and_trace()
    test_orchestrator_set_task_state()
    test_orchestrator_route_message_return()
    test_orchestrator_unregister_removes_from_parent()
    test_tot_not_implemented()
    print("Phase 1 tests OK")