import pytest
import sys
import os
sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
from slic.utils.lazypv import PV


def test_getattr():
    # Only valid kwargs accepted by epics.PV
    pv = PV(
        "ca://TEST:FLOAT",
        form='time',
        auto_monitor=True,
        verbose=True,
        connection_timeout=3.0
    )

    # Pv not yet instantiated
    assert pv._pv is None

    # Trigger instantiation by accessing a real attribute
    pvname = pv.__getattr__('pvname')
    assert isinstance(pvname, str)
    assert pvname == "ca://TEST:FLOAT"
    assert pv._pv is not None

    # access all known epics.PV kwargs via __getattr__
    form = pv.__getattr__('form')
    assert form == 'time'

    auto_monitor = pv.__getattr__('auto_monitor')
    assert auto_monitor is True

    verbose = pv.__getattr__('verbose')
    assert verbose is True

    timeout = pv.__getattr__('connection_timeout')
    assert isinstance(timeout, (float, int))
    assert timeout == 3.0

    # Remove the instantiated PV
    del pv._pv
    pv._pv = None
    assert pv._pv is None