#!/usr/libexec/platform-python
#
# Orca
#
# Copyright 2010-2012 The Orca Team
# Copyright 2012 Igalia, S.L.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., Franklin Street, Fifth Floor,
# Boston MA  02110-1301 USA.

__id__        = "$Id$"
__version__   = "$Revision$"
__date__      = "$Date$"
__copyright__ = "Copyright (c) 2010-2012 The Orca Team" \
                "Copyright (c) 2012 Igalia, S.L."
__license__   = "LGPL"

import argparse
import os
import pyatspi
import signal
import subprocess
import sys
import time

sys.prefix = '/usr'
pythondir = '${prefix}/lib/python3.6/site-packages'.replace('${prefix}', '/usr')
sys.path.insert(1, pythondir)

from orca import debug
from orca import messages
from orca import orca
from orca import settings
from orca.orca_platform import version

class ListApps(argparse.Action):
    def __call__(self, parser, namespace, values, option_string=None):
        desktop = pyatspi.Registry.getDesktop(0)
        for app in desktop:
            if app is None:
                continue

            pid = app.get_process_id()
            try:
                name = app.name or "(none)"
            except:
                name = "[DEAD]"

            try:
                cmdline = subprocess.getoutput('cat /proc/%s/cmdline' % pid)
            except:
                cmdline = '(exception encountered)'
            else:
                cmdline = cmdline.replace('\x00', ' ')

            print(time.strftime('%H:%M:%S', time.localtime()),
                  '  pid: %5s   %-25s  %s' % (pid, name, cmdline))

        parser.exit()

class Settings(argparse.Action):
    def __call__(self, parser, namespace, values, option_string=None):
        settingsDict = getattr(namespace, 'settings', {})
        invalid = getattr(namespace, 'invalid', [])
        for value in values.split(','):
            item = str.title(value).replace('-', '')
            try:
                test = 'enable%s' % item
                eval('settings.%s' % test)
            except AttributeError:
                try:
                    test = 'show%s' % item
                    eval('settings.%s' % test)
                except AttributeError:
                    invalid.append(value)
                    continue
            settingsDict[test] = self.const
        setattr(namespace, 'settings', settingsDict)
        setattr(namespace, 'invalid', invalid)

class HelpFormatter(argparse.HelpFormatter):
    def __init__(self, prog, indent_increment=2, max_help_position=32,
                 width=None):

        super().__init__(prog, indent_increment, max_help_position, width)

    def add_usage(self, usage, actions, groups, prefix=None):
        super().add_usage(usage, actions, groups, messages.CLI_USAGE)

class Parser(argparse.ArgumentParser):
    def __init__(self, *args, **kwargs):
        super(Parser, self).__init__(
            epilog=messages.CLI_EPILOG, formatter_class=HelpFormatter, add_help=False)
        self.add_argument(
            "-h", "--help", action="help", help=messages.CLI_HELP)
        self.add_argument(
            "-v", "--version", action="version", version=version, help=version)
        self.add_argument(
            "-r", "--replace", action="store_true", help=messages.CLI_REPLACE)
        self.add_argument(
            "-s", "--setup", action="store_true", help=messages.CLI_GUI_SETUP)
        self.add_argument(
            "-l", "--list-apps", action=ListApps, nargs=0,
            help=messages.CLI_LIST_APPS)
        self.add_argument(
            "-e", "--enable", action=Settings, const=True,
            help=messages.CLI_ENABLE_OPTION, metavar=messages.CLI_OPTION)
        self.add_argument(
            "-d", "--disable", action=Settings, const=False,
            help=messages.CLI_DISABLE_OPTION, metavar=messages.CLI_OPTION)
        self.add_argument(
            "-p", "--profile", action="store",
            help=messages.CLI_LOAD_PROFILE, metavar=messages.CLI_PROFILE_NAME)
        self.add_argument(
            "-u", "--user-prefs", action="store",
            help=messages.CLI_LOAD_PREFS, metavar=messages.CLI_PREFS_DIR)
        self.add_argument(
            "--debug-file", action="store",
            help=messages.CLI_DEBUG_FILE, metavar=messages.CLI_DEBUG_FILE_NAME)
        self.add_argument(
            "--debug", action="store_true", help=messages.CLI_ENABLE_DEBUG)

        self._optionals.title = messages.CLI_OPTIONAL_ARGUMENTS

    def parse_known_args(self, *args, **kwargs):
        opts, invalid = super(Parser, self).parse_known_args(*args, **kwargs)
        try:
            invalid.extend(opts.invalid)
        except:
            pass
        if invalid:
            print((messages.CLI_INVALID_OPTIONS + " ".join(invalid)))

        if opts.debug_file:
            opts.debug = True
        elif opts.debug:
            opts.debug_file = time.strftime('debug-%Y-%m-%d-%H:%M:%S.out')

        return opts, invalid

def setProcessName(name):
    """Attempts to set the process name to 'orca'."""

    sys.argv[0] = 'orca'

    # Disabling the import error of setproctitle.
    # pylint: disable-msg=F0401
    try:
        from setproctitle import setproctitle
    except ImportError:
        pass
    else:
        setproctitle(name)
        return True

    try:
        from ctypes import cdll, byref, create_string_buffer
        libc = cdll.LoadLibrary('libc.so.6')
        stringBuffer = create_string_buffer(len(name) + 1)
        stringBuffer.value = bytes(name, 'UTF-8')
        libc.prctl(15, byref(stringBuffer), 0, 0, 0)
        return True
    except:
        pass

    return False

def inGraphicalDesktop():
    """Returns True if we are in a graphical desktop."""

    # TODO - JD: Make this desktop environment agnostic
    try:
        from gi.repository import Gdk
        display = Gdk.Display.get_default()
    except:
        return False

    return display is not None

def otherOrcas():
    """Returns the pid of any other instances of Orca owned by this user."""

    openFile = subprocess.Popen('pgrep -u %s orca' % os.getuid(),
                                shell=True,
                                stdout=subprocess.PIPE).stdout
    pids = openFile.read()
    openFile.close()
    orcas = [int(p) for p in pids.split()]

    pid = os.getpid()
    return [p for p in orcas if p != pid]

def cleanup(sigval):
    """Tries to clean up any other running Orca instances owned by this user."""

    orcasToKill = otherOrcas()
    debug.println(
        debug.LEVEL_INFO, "INFO: Cleaning up these PIDs: %s" % orcasToKill)

    def onTimeout(signum, frame):
        orcasToKill = otherOrcas()
        debug.println(
            debug.LEVEL_INFO, "INFO: Timeout cleaning up: %s" % orcasToKill)
        for pid in orcasToKill:
            os.kill(pid, signal.SIGKILL)

    for pid in orcasToKill:
        os.kill(pid, sigval)
    signal.signal(signal.SIGALRM, onTimeout)
    signal.alarm(2)
    while otherOrcas():
        time.sleep(0.5)

def main():
    setProcessName('orca')

    parser = Parser()
    args, invalid = parser.parse_known_args()

    if args.debug:
        debug.debugLevel = debug.LEVEL_ALL
        debug.eventDebugLevel = debug.LEVEL_OFF
        debug.debugFile = open(args.debug_file, 'w')

    if args.replace:
        cleanup(signal.SIGKILL)

    settingsDict = getattr(args, 'settings', {})

    if not inGraphicalDesktop():
        print(messages.CLI_NO_DESKTOP_ERROR)
        return 1

    manager = orca.getSettingsManager()
    if not manager:
        print(messages.CLI_SETTINGS_MANAGER_ERROR)
        return 1

    manager.activate(args.user_prefs, settingsDict)
    sys.path.insert(0, manager.getPrefsDir())

    if args.profile:
        try:
            manager.setProfile(args.profile)
        except:
            print(messages.CLI_LOAD_PROFILE_ERROR % args.profile)
            manager.setProfile()

    if args.setup:
        cleanup(signal.SIGKILL)
        orca.showPreferencesGUI()

    if otherOrcas():
        print(messages.CLI_OTHER_ORCAS_ERROR)
        return 1

    return orca.main()

if __name__ == "__main__":
    sys.exit(main())