# -*- coding: utf-8 -*-
"""
OnionShare | https://onionshare.org/

Copyright (C) 2014-2018 Micah Lee <micah@micahflee.com>

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/>.
"""
from __future__ import division
import os
import sys
import platform
import argparse
import signal
import psutil
from PyQt5 import QtCore, QtWidgets

from onionshare.common import Common

from .gui_common import GuiCommon
from .widgets import Alert
from .main_window import MainWindow


class Application(QtWidgets.QApplication):
    """
    This is Qt's QApplication class. It has been overridden to support threads
    and the quick keyboard shortcut.
    """

    def __init__(self, common):
        if common.platform == "Linux" or common.platform == "BSD":
            self.setAttribute(QtCore.Qt.AA_X11InitThreads, True)
        QtWidgets.QApplication.__init__(self, sys.argv)
        self.installEventFilter(self)

    def eventFilter(self, obj, event):
        if (
            event.type() == QtCore.QEvent.KeyPress
            and event.key() == QtCore.Qt.Key_Q
            and event.modifiers() == QtCore.Qt.ControlModifier
        ):
            self.quit()
        return False


def main():
    """
    The main() function implements all of the logic that the GUI version of onionshare uses.
    """
    common = Common()

    # Display OnionShare banner
    print(f"OnionShare {common.version} | https://onionshare.org/")

    # Allow Ctrl-C to smoothly quit the program instead of throwing an exception
    # https://stackoverflow.com/questions/42814093/how-to-handle-ctrlc-in-python-app-with-pyqt
    signal.signal(signal.SIGINT, signal.SIG_DFL)

    # Start the Qt app
    global qtapp
    qtapp = Application(common)

    # Parse arguments
    parser = argparse.ArgumentParser(
        formatter_class=lambda prog: argparse.HelpFormatter(prog, max_help_position=48)
    )
    parser.add_argument(
        "--local-only",
        action="store_true",
        dest="local_only",
        help="Don't use Tor (only for development)",
    )
    parser.add_argument(
        "-v",
        "--verbose",
        action="store_true",
        dest="verbose",
        help="Log OnionShare errors to stdout, and web errors to disk",
    )
    parser.add_argument(
        "--filenames",
        metavar="filenames",
        nargs="+",
        help="List of files or folders to share",
    )
    args = parser.parse_args()

    filenames = args.filenames
    if filenames:
        for i in range(len(filenames)):
            filenames[i] = os.path.abspath(filenames[i])

    local_only = bool(args.local_only)
    verbose = bool(args.verbose)

    # Verbose mode?
    common.verbose = verbose

    # Validation
    if filenames:
        valid = True
        for filename in filenames:
            if not os.path.isfile(filename) and not os.path.isdir(filename):
                Alert(common, f"{filename} is not a valid file.")
                valid = False
            if not os.access(filename, os.R_OK):
                Alert(common, f"{filename} is not a readable file.")
                valid = False
        if not valid:
            sys.exit()

    # Is there another onionshare-gui running?
    existing_pid = None
    for proc in psutil.process_iter(attrs=["pid", "name", "cmdline"]):
        if proc.info["pid"] == os.getpid():
            continue

        if proc.info["name"] == "onionshare-gui":
            existing_pid = proc.info["pid"]
            break
        else:
            # Dev mode onionshare?
            if proc.info["cmdline"] and len(proc.info["cmdline"]) >= 2:
                if (
                    os.path.basename(proc.info["cmdline"][0]).lower() == "python"
                    and os.path.basename(proc.info["cmdline"][1]) == "onionshare-gui"
                ):
                    existing_pid = proc.info["pid"]
                    break

    if existing_pid:
        print(f"Opening tab in existing OnionShare window (pid {proc.info['pid']})")
        # TODO: open tab
        return

    # Attach the GUI common parts to the common object
    common.gui = GuiCommon(common, qtapp, local_only)

    # Launch the gui
    main_window = MainWindow(common, filenames)

    # Clean up when app quits
    def shutdown():
        main_window.cleanup()

    qtapp.aboutToQuit.connect(shutdown)

    # All done
    sys.exit(qtapp.exec_())


if __name__ == "__main__":
    main()