#!/usr/bin/env python3

from PyQt5 import QtWidgets, QtGui, QtCore

import sys
import os
import time
import signal
import argparse
import logging

logging.getLogger().disabled = True

from concurrent import futures

import grpc

dist_path = '/usr/lib/python3/dist-packages/'
if dist_path not in sys.path:
    sys.path.append(dist_path)

from opensnitch.service import UIService
from opensnitch.config import Config
import opensnitch.version
import opensnitch.ui_pb2
from opensnitch.ui_pb2_grpc import add_UIServicer_to_server

def on_exit():
    app.quit()
    server.stop(0)
    sys.exit(0)

def supported_qt_version(major, medium, minor):
    q = QtCore.QT_VERSION_STR.split(".")
    return int(q[0]) >= major and int(q[1]) >= medium and int(q[2]) >= minor

if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='OpenSnitch UI service.')
    parser.add_argument("--socket", dest="socket", default="unix:///tmp/osui.sock", help="Path of the unix socket for the gRPC service (https://github.com/grpc/grpc/blob/master/doc/naming.md).", metavar="FILE")
    parser.add_argument("--max-clients", dest="serverWorkers", default=10, help="Max number of allowed clients (incoming connections).")

    args = parser.parse_args()

    os.environ["QT_AUTO_SCREEN_SCALE_FACTOR"] = "1"
    if supported_qt_version(5,6,0):
        try:
            # NOTE: maybe we also need Qt::AA_UseHighDpiPixmaps
            QtCore.QApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling, True)
        except Exception:
            pass

    app = QtWidgets.QApplication(sys.argv)

    service = UIService(app, on_exit)
    # @doc: https://grpc.github.io/grpc/python/grpc.html#server-object
    server = grpc.server(futures.ThreadPoolExecutor(max_workers=int(args.serverWorkers)))

    add_UIServicer_to_server(service, server)

    if args.socket.startswith("unix://"):
        socket = args.socket[7:]
        socket = os.path.abspath(socket)
        server.add_insecure_port("unix:%s" % socket)
    else:
        server.add_insecure_port(args.socket)

    # https://stackoverflow.com/questions/5160577/ctrl-c-doesnt-work-with-pyqt
    signal.signal(signal.SIGINT, signal.SIG_DFL)

    try:
        # print "OpenSnitch UI service running on %s ..." % socket
        server.start()
        app.exec_()
    except KeyboardInterrupt:
        on_exit()