import pytest
from types import SimpleNamespace

from agent_framework.routing.enterprise_router import EnterpriseRouter
from agent_framework.routing.models import RouteDecision


def test_explicit_keyword_shift_preempts_stickiness():
    d = RouteDecision(route="support_agent", agent="support_agent", intent="retail_support_exchange_return", method="keyword", metadata={"matched_keyword": "devolver pedido"})
    assert EnterpriseRouter._is_explicit_intent_shift(d) is True


def test_short_generic_keyword_does_not_preempt():
    d = RouteDecision(route="x", agent="x", intent="x", method="keyword", metadata={"matched_keyword": "id"})
    assert EnterpriseRouter._is_explicit_intent_shift(d) is False


def test_same_agent_explicit_intent_shift_must_preempt_stickiness():
    router = object.__new__(EnterpriseRouter)
    router.intents = []
    # This test documents the key regression: changing from a read-only intent
    # to a transactional intent handled by the SAME agent must still be treated
    # as an explicit intent shift. The route() integration tests exercise the
    # full async path; here we lock the explicitness predicate itself.
    d = RouteDecision(
        route="orders_agent",
        agent="orders_agent",
        intent="retail_order_cancel",
        method="keyword",
        metadata={"matched_keyword": "cancelar pedido"},
    )
    assert EnterpriseRouter._is_explicit_intent_shift(d) is True

@pytest.mark.asyncio
async def test_same_agent_transaction_keyword_preempts_continuity(monkeypatch):
    """Regression: tracking -> cancelar pedido must not reuse tracking intent."""
    from agent_framework.routing.models import IntentDefinition

    class _Continuity:
        async def evaluate(self, state, *, intents):
            raise AssertionError("continuity must be preempted by explicit intent shift")

    router = object.__new__(EnterpriseRouter)
    router.state_policies = []
    router.intents = [
        IntentDefinition(
            name="retail_order_cancel",
            domain="retail",
            agent="orders_agent",
            description="cancelamento",
            priority=20,
            mcp_tools=["consultar_pedido", "cancelar_pedido"],
            keywords=["cancelar pedido"],
            examples=[],
            enabled=True,
        ),
        IntentDefinition(
            name="retail_order_tracking",
            domain="retail",
            agent="orders_agent",
            description="tracking",
            priority=30,
            mcp_tools=["consultar_pedido", "consultar_entrega"],
            keywords=["pedido"],
            examples=[],
            enabled=True,
        ),
    ]
    router.continuity = _Continuity()
    router.enable_llm_router = False
    router.llm = None
    router.telemetry = None
    router.fallback_agent = "billing_agent"

    decision = await router.route({
        "user_text": "quero cancelar pedido",
        "sanitized_input": "quero cancelar pedido",
        "active_agent": "orders_agent",
        "intent": "retail_order_tracking",
        "route_decision": {
            "route": "orders_agent",
            "agent": "orders_agent",
            "intent": "retail_order_tracking",
            "domain": "retail",
            "mcp_tools": ["consultar_pedido", "consultar_entrega"],
        },
        "context": {"session": {}},
    })

    assert decision.agent == "orders_agent"
    assert decision.intent == "retail_order_cancel"
    assert decision.method == "keyword"
    assert decision.mcp_tools == ["consultar_pedido", "cancelar_pedido"]
    assert decision.metadata["route_stickiness_preempted"] is True
    assert decision.metadata["previous_agent"] == "orders_agent"
    assert decision.metadata["previous_intent"] == "retail_order_tracking"