from opentelemetry.sdk.trace import TracerProvider

from app import telemetry


def test_telemetry_is_fail_open_without_endpoint(monkeypatch) -> None:
    monkeypatch.delenv("OTEL_EXPORTER_OTLP_ENDPOINT", raising=False)
    monkeypatch.setattr(telemetry, "_runtime", None)

    assert telemetry.init_telemetry("test-service") is None


def test_structlog_processor_adds_active_trace_context_only() -> None:
    provider = TracerProvider()
    tracer = provider.get_tracer("test")
    event = {"event": "safe", "request_id": "request-1"}

    with tracer.start_as_current_span("operation"):
        result = telemetry.add_trace_context(None, "info", event)

    assert result["event"] == "safe"
    assert result["request_id"] == "request-1"
    assert len(result["trace_id"]) == 32
    assert len(result["span_id"]) == 16
    assert set(result) == {"event", "request_id", "trace_id", "span_id"}


def test_no_active_span_does_not_invent_trace_context() -> None:
    result = telemetry.add_trace_context(None, "info", {"event": "safe"})
    assert result == {"event": "safe"}


def test_async_origin_creates_link_without_parenting_worker_span() -> None:
    tracer = TracerProvider().get_tracer("test")
    with tracer.start_as_current_span("request"):
        traceparent = telemetry.current_traceparent()
        origin_trace_id = telemetry.current_trace_id()

    links = telemetry.origin_links(traceparent)
    assert len(links) == 1
    assert format(links[0].context.trace_id, "032x") == origin_trace_id