import ctypes
import logging
import signal
import sys
from inspect import isclass
from importlib import import_module
from pathlib import Path
from pkgutil import iter_modules

from plugins import *

from PyQt6 import QtCore
from PyQt6.QtCore import QTimer
from PyQt6.QtGui import QIcon
from PyQt6.QtWidgets import QApplication

import constants
from raven.ravenwindow import RavenWindow
from ravenui import RavenUI

logging.basicConfig(level=logging.INFO)
log = logging.getLogger("main")


def stop_signal(signum, _stackframe):
    """ Handle terminate signal """
    try:
        log.info("Terminate signal received. %s", signum)
        QtCore.QCoreApplication.quit()
    except Exception:
        log.exception("Exception occurred while terminating")
        sys.exit(1)
    sys.exit(0)


def init_signal_handler():
    # workaround to make signals work in QT apps.
    # They do not work out of the box, because the main thread
    # is running in C++ code once app.exec() is executed
    # Forcing an empty lambda to be executed periodically gives
    # control back to python and allows python to react to signals
    timer = QTimer()
    timer.timeout.connect(lambda: None)
    timer.start(100)
    signal.signal(signal.SIGINT, stop_signal)
    signal.signal(signal.SIGTERM, stop_signal)


def init_translator(app: QApplication):
    # translator = QTranslator()
    # if translator.load(QLocale("de"), "messages_de.ts"):
    #    app.installTranslator(translator)
    pass


def set_window_icon(app: QApplication):
    app.setWindowIcon(QIcon("../" + constants.raven_icon))

    # see https://stackoverflow.com/questions/1551605/how-to-set-applications-taskbar-icon-in-windows-7/1552105#1552105
    if sys.platform == 'win32' or sys.platform == 'cygwin':
        ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID('opentext.ravenlog')


if __name__ == "__main__":
    filterplugin = PluginRegistry.load_plugin("FilterPlugin")
    logfileviewerplugin = PluginRegistry.load_plugin("LogFileViewerPlugin")

    PluginRegistry.execute("say_hello", "World")

    app = QApplication(sys.argv)
    set_window_icon(app)
    init_translator(app)
    init_signal_handler()

    window = RavenWindow()
    RavenUI.window = window
    window.show()

    app.exec()