import math
import sys
import os

# Ensure the local src package is importable when tests run from repo root
src_path = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "src"))
if src_path not in sys.path:
    sys.path.insert(0, src_path)

from ar_grid_tutor_mobile_ar_digital_twin_for.core import TelemetrySample, TwinEngine


def test_reconcile_updates_baseline_and_delta():
    engine = TwinEngine()
    asset_id = "solar-1"
    # initial telemetry comes in; baseline starts empty
    sample1 = TelemetrySample(asset_id=asset_id, timestamp=1.0, metrics={"voltage": 480.0, "temp": 25.0})
    out1 = engine.reconcile(sample1)
    assert out1["asset_id"] == asset_id
    assert out1["version"] == 2  # since initial register creates version 1 and reconcile increments to 2
    assert isinstance(out1["delta"], dict)
    assert out1["delta"]["voltage"] == 480.0 - 0.0

    # second sample with changed values
    sample2 = TelemetrySample(asset_id=asset_id, timestamp=2.0, metrics={"voltage": 485.0, "temp": 27.0})
    out2 = engine.reconcile(sample2)
    assert out2["asset_id"] == asset_id
    assert out2["version"] == 3
    assert math.isclose(out2["delta"]["voltage"], 5.0, rel_tol=1e-6)
    assert out2["new_baseline"]["voltage"] == 485.0