# -*- coding: utf-8 -*-
# app.py
# Copyright (C) 2013 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import logging
import signal
import sys

from functools import partial

from PySide import QtCore, QtGui

from leap.common.events import server as event_server
from leap.util import __version__ as VERSION
from leap.util import leap_argparse
from leap.util.leap_log_handler import LeapLogHandler
from leap.util.requirement_checker import check_requirements
from leap.gui import locale_rc
from leap.gui import twisted_main
from leap.gui.mainwindow import MainWindow
from leap.platform_init import IS_MAC
from leap.platform_init.locks import we_are_the_one_and_only
from leap.services.tx import leap_services


import codecs
codecs.register(lambda name: codecs.lookup('utf-8')
                if name == 'cp65001' else None)

# pylint: avoid unused import
assert(locale_rc)


def sigint_handler(*args, **kwargs):
    """
    Signal handler for SIGINT
    """
    logger = kwargs.get('logger', None)
    if logger:
        logger.debug("SIGINT catched. shutting down...")
    mainwindow = args[0]
    mainwindow.quit()


def install_qtreactor(logger):
    import qt4reactor
    qt4reactor.install()
    logger.debug("Qt4 reactor installed")


def main():
    """
    Starts the main event loop and launches the main window.
    """
    event_server.ensure_server(event_server.SERVER_PORT)

    _, opts = leap_argparse.init_leapc_args()
    debug = opts.debug
    standalone = opts.standalone
    bypass_checks = opts.danger

    # TODO: get severity from command line args
    if debug:
        level = logging.DEBUG
    else:
        level = logging.WARNING

    # Console logger
    logger = logging.getLogger(name='leap')
    logger.setLevel(level)
    console = logging.StreamHandler()
    console.setLevel(level)
    log_format = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
    formatter = logging.Formatter(log_format)
    console.setFormatter(formatter)
    logger.addHandler(console)

    # LEAP custom handler
    leap_handler = LeapLogHandler()
    leap_handler.setLevel(level)
    logger.addHandler(leap_handler)

    logger.debug('Leap handler plugged!')

    if not we_are_the_one_and_only():
        # leap-client is already running
        logger.warning("Tried to launch more than one instance "
                       "of leap-client. Raising the existing "
                       "one instead.")
        sys.exit(1)

    check_requirements()

    logger.info('~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~')
    logger.info('LEAP client version %s', VERSION)
    logger.info('~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~')
    logfile = opts.log_file
    if logfile is not None:
        logger.debug('Setting logfile to %s ', logfile)
        fileh = logging.FileHandler(logfile)
        fileh.setLevel(logging.DEBUG)
        fileh.setFormatter(formatter)
        logger.addHandler(fileh)

    logger.info('Starting app')
    app = QtGui.QApplication(sys.argv)

    # install the qt4reactor.
    install_qtreactor(logger)

    # To test:
    # $ LANG=es ./app.py
    locale = QtCore.QLocale.system().name()
    qtTranslator = QtCore.QTranslator()
    if qtTranslator.load("qt_%s" % locale, ":/translations"):
        app.installTranslator(qtTranslator)
    appTranslator = QtCore.QTranslator()
    if appTranslator.load("%s.qm" % locale[:2], ":/translations"):
        app.installTranslator(appTranslator)

    # Needed for initializing qsettings it will write
    # .config/leap/leap.conf top level app settings in a platform
    # independent way
    app.setOrganizationName("leap")
    app.setApplicationName("leap")
    app.setOrganizationDomain("leap.se")

    # XXX ---------------------------------------------------------
    # In quarantine, looks like we don't need it anymore.
    # This dummy timer ensures that control is given to the outside
    # loop, so we can hook our sigint handler.
    #timer = QtCore.QTimer()
    #timer.start(500)
    #timer.timeout.connect(lambda: None)
    # XXX ---------------------------------------------------------

    window = MainWindow(
        lambda: twisted_main.quit(app),
        standalone=standalone,
        bypass_checks=bypass_checks)
    window.show()

    sigint_window = partial(sigint_handler, window, logger=logger)
    signal.signal(signal.SIGINT, sigint_window)

    if IS_MAC:
        window.raise_()

    tx_app = leap_services()
    assert(tx_app)

    # Run main loop
    twisted_main.start(app)

if __name__ == "__main__":
    main()
