import time
from meshchatx.src.backend.telemetry_utils import Telemeter


def test_pack_unpack_battery_and_link():
    battery = {"charge_percent": 85, "charging": 1}
    physical_link = {"rssi": -90, "snr": 8, "q": 95}
    ts = int(time.time())

    packed = Telemeter.pack(time_utc=ts, battery=battery, physical_link=physical_link)
    assert isinstance(packed, bytes)

    unpacked = Telemeter.from_packed(packed)
    assert unpacked["time"]["utc"] == ts
    assert unpacked["battery"]["charge_percent"] == battery["charge_percent"]
    assert unpacked["battery"]["charging"] == battery["charging"]
    assert unpacked["physical_link"]["rssi"] == physical_link["rssi"]
    assert unpacked["physical_link"]["snr"] == physical_link["snr"]
    assert unpacked["physical_link"]["q"] == physical_link["q"]


def test_telemeter_from_packed_robustness():
    # Test with corrupted umsgpack data
    assert Telemeter.from_packed(b"\xff\xff\xff") is None
    # Test with empty data
    assert Telemeter.from_packed(b"") is None
    # Test with valid umsgpack but unexpected structure
    from RNS.vendor import umsgpack

    invalid_structure = umsgpack.packb({"not_a_sensor": 123})
    assert Telemeter.from_packed(invalid_structure) == {}


def test_telemeter_unpack_location_robustness():
    # Test with insufficient elements
    assert Telemeter.unpack_location([b"lat", b"lon"]) is None
    # Test with invalid types
    assert Telemeter.unpack_location(["not_bytes"] * 7) is None


def test_sideband_request_format_compatibility():
    # Sideband telemetry request command is 0x01
    # It can be a simple int 0x01 or a dict {0x01: timebase}

    # This test is more about the logic in on_lxmf_delivery,
    # but we can verify our assumptions about command structure here if needed.
    pass