import pytest

from src.services import knowledge_service as knowledge_service_module
from src.services.knowledge_service import KnowledgeService


class _BrokenDbContext:
    async def __aenter__(self):
        raise RuntimeError("db pool exhausted")

    async def __aexit__(self, exc_type, exc, tb):
        return False


@pytest.mark.asyncio
async def test_knowledge_list_entries_fails_soft_when_readback_breaks(monkeypatch) -> None:
    monkeypatch.setattr(
        knowledge_service_module,
        "get_db_context",
        lambda: _BrokenDbContext(),
    )
    service = KnowledgeService.__new__(KnowledgeService)

    response = await service.list_entries(limit=50)

    assert response.items == []
    assert response.total == 0
    assert response.categories == []
    assert response.readback_status == "degraded"
    assert response.operator_stage == "knowledge_readback_degraded_ai_controlled_repair"
    assert response.next_step == "queue_ai_controlled_km_readback_retry_tagging_and_connector_verifier"
    assert response.writes_on_read is False
    assert response.manual_review_required is False