import sys
import os

# Ensure package source is importable during tests
SRC_DIR = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "src"))
if SRC_DIR not in sys.path:
    sys.path.insert(0, SRC_DIR)

from pulsemesh_open_telemetry_visualization_a.delta import Delta, DeltaSync
from pulsemesh_open_telemetry_visualization_a.telemetry import TelemetrySample


def test_delta_serialization_and_sync():
    t1 = TelemetrySample(timestamp=1.0, source="a", metric="m1", value=1.0, units="u")
    t2 = TelemetrySample(timestamp=2.0, source="a", metric="m2", value=2.0, units="u")
    d1 = Delta(delta_id="d1", timestamp=1.0, items=[t1.to_dict()])
    d2 = Delta(delta_id="d2", timestamp=2.0, items=[t2.to_dict()])
    ds = DeltaSync()
    ds.add_delta(d1)
    ds.add_delta(d2)
    payload = ds.to_payload()
    assert isinstance(payload, dict)
    assert len(payload["deltas"]) == 2

    # simulate remote payload
    remote = {"deltas": [d1.to_dict() for d in [d1]]}
    merged = ds.merge_with_remote(remote)
    assert len(merged) >= 1