"""
the main function
to load the main simulator loader widget
"""
import sys
from dialin.ui import utils
from PySide2 import QtCore, QtWidgets
from simulator.loader import Simulator
from dialin.ui.hd_simulator import HDSimulator
from dialin.ui.hd_simulator_alarms import HDAlarmsSimulator, HIGH


def main():
    """
    the main function which initializes the Simulator and starts it.
    :return: none
    """
    utils.tstStart(__file__)

    # create qt application
    app = QtWidgets.QApplication(sys.argv)

    simulator = Simulator()
    simulator.show()

    hd_simulator_instance_counter_check()

    utils.tstDone()

    # start qt application main loop
    sys.exit(app.exec_())


def hd_simulator_instance_counter_check():
    """
    Checks to make sure only one instance of the HDSimulator has been created.
    this code shall be part of the HDSimulator __init__ but other codes are not ready for this.
    so only the simulator is checking it now.
    """
    if HDSimulator.instanceCount > 1:
        raise Exception("more than one instance of HDSimulator shall not be created.")
    else:
        if HDAlarmsSimulator.instanceCount > 1:
            raise Exception("more than one instance of HDAlarmsSimulator shall not be created.")
        else:
            print("HDAlarmsSimulator number of instances is ", HDAlarmsSimulator.instanceCount)
        print("HDSimulator number of instances is ", HDSimulator.instanceCount)


if __name__ == "__main__":
    QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_ShareOpenGLContexts)
    main()