#
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import importlib.util

import pytest
from pytest import approx

from pymeasure.adapters import VISAAdapter
from pymeasure.instruments import Instrument

# This uses a pyvisa-sim default instrument, we could also define our own.
SIM_RESOURCE = 'ASRL2::INSTR'

is_pyvisa_sim_installed = bool(importlib.util.find_spec('pyvisa_sim'))
if not is_pyvisa_sim_installed:
    pytest.skip('PyVISA tests require the pyvisa-sim library', allow_module_level=True)


def make_visa_adapter(**kwargs):
    return VISAAdapter(SIM_RESOURCE, visa_library='@sim', **kwargs)


def test_visa_version():
    assert VISAAdapter.has_supported_version()


def test_correct_visa_kwarg():
    """Confirm that the query_delay kwargs gets passed through to the VISA connection."""
    instr = Instrument(adapter=SIM_RESOURCE, name='delayed', query_delay=0.5, visa_library='@sim')
    assert instr.adapter.connection.query_delay == approx(0.5)


def test_visa_adapter():
    adapter = make_visa_adapter()
    assert repr(adapter) == f"<VISAAdapter(resource='{SIM_RESOURCE}')>"

    assert adapter.ask("*IDN?") == "SCPI,MOCK,VERSION_1.0\n"

    adapter.write("*IDN?")
    assert adapter.read() == "SCPI,MOCK,VERSION_1.0\n"


def test_visa_adapter_ask_values():
    adapter = make_visa_adapter()
    assert adapter.ask_values(":VOLT:IMM:AMPL?", separator=",") == [1.0]


def test_visa_adapter_write_binary_values():
    adapter = make_visa_adapter()
    adapter.write_binary_values("OUTP", [1], datatype='B')