#!/usr/bin/python

#
# Copyright (C) 2006 Red Hat, Inc.
# Copyright (C) 2006 Daniel P. Berrange <berrange@redhat.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 2 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301 USA.
#

import argparse
import logging
import os
import signal
import sys
import traceback

# pylint: disable=E0611
from gi.repository import GObject
from gi.repository import LibvirtGLib
# pylint: enable=E0611

from virtinst import util as util
from virtinst import cli as virtinstcli
from virtcli import cliutils, cliconfig


try:
    # Avoid a deprecation warning about threads_init
    import gi
    gi.check_version("3.9.1")
except (ValueError, AttributeError):
    GObject.threads_init()


def _show_startup_error(msg, details):
    logging.debug("Error starting virt-manager: %s\n%s", msg, details,
                  exc_info=True)
    from virtManager.error import vmmErrorDialog
    err = vmmErrorDialog()
    title = _("Error starting Virtual Machine Manager")
    err.show_err(title + ": " + msg,
                 details=details,
                 title=title,
                 modal=True,
                 debug=False)


def drop_tty():
    # We fork and setsid so that we drop the controlling
    # tty. This prevents libvirt's SSH tunnels from prompting
    # for user input if SSH keys/agent aren't configured.
    if os.fork() != 0:
        os._exit(0)  # pylint: disable=W0212

    os.setsid()


def drop_stdio():
    # This is part of the fork process described in drop_tty()
    for fd in range(0, 2):
        try:
            os.close(fd)
        except OSError:
            pass

    os.open(os.devnull, os.O_RDWR)
    os.dup2(0, 1)
    os.dup2(0, 2)


def parse_commandline():
    epilog = ("Also accepts standard GTK arguments like --g-fatal-warnings")
    parser = argparse.ArgumentParser(usage="virt-manager [options]",
                                     epilog=epilog)
    parser.add_argument('--version', action='version',
                        version=cliconfig.__version__)
    parser.set_defaults(uuid=None)

    # Trace every libvirt API call to debug output
    parser.add_argument("--trace-libvirt", dest="tracelibvirt",
        help=argparse.SUPPRESS, action="store_true")

    # Don't load any connections on startup to test first run
    # PackageKit integration
    parser.add_argument("--test-first-run", dest="testfirstrun",
        help=argparse.SUPPRESS, action="store_true")

    parser.add_argument("-c", "--connect", dest="uri",
        help="Connect to hypervisor at URI", metavar="URI")
    parser.add_argument("--debug", action="store_true", dest="debug",
        help="Print debug output to stdout (implies --no-fork)",
        default=False)
    parser.add_argument("--no-fork", action="store_true", dest="nofork",
        help="Don't fork into background on startup")
    parser.add_argument("--no-conn-autostart", action="store_true",
        dest="no_conn_auto", help="Do not autostart connections")
    parser.add_argument("--spice-disable-auto-usbredir", action="store_true",
        dest="usbredir", help="Disable Auto USB redirection support")

    parser.add_argument("--show-domain-creator", action="store_true",
        help="Show 'New VM' wizard")
    parser.add_argument("--show-domain-editor", metavar="NAME|ID|UUID",
        help="Show domain details window")
    parser.add_argument("--show-domain-performance", metavar="NAME|ID|UUID",
        help="Show domain performance window")
    parser.add_argument("--show-domain-console", metavar="NAME|ID|UUID",
        help="Show domain graphical console window")
    parser.add_argument("--show-host-summary", action="store_true",
        help="Show connection details window")

    return parser.parse_known_args()


def launch_specific_window(engine, show, uri, uuid):
    if not show:
        return

    logging.debug("Launching requested window '%s'", show)
    if show == 'creator':
        engine.show_domain_creator(uri)
    elif show == 'editor':
        engine.show_domain_editor(uri, uuid)
    elif show == 'performance':
        engine.show_domain_performance(uri, uuid)
    elif show == 'console':
        engine.show_domain_console(uri, uuid)
    elif show == 'summary':
        engine.show_host_summary(uri)


def main():
    cliutils.setup_i18n()
    (options, leftovers) = parse_commandline()

    virtinstcli.setupLogging("virt-manager", options.debug, False, False)

    import virtManager
    logging.debug("virt-manager version: %s", cliconfig.__version__)
    logging.debug("virtManager import: %s", str(virtManager))

    if options.tracelibvirt:
        logging.debug("Libvirt tracing requested")
        import virtManager.module_trace
        import libvirt
        virtManager.module_trace.wrap_module(libvirt)

    # Now we've got basic environment up & running we can fork
    do_drop_stdio = False
    if not options.nofork and not options.debug:
        drop_tty()
        do_drop_stdio = True

        # Ignore SIGHUP, otherwise a serial console closing drops the whole app
        signal.signal(signal.SIGHUP, signal.SIG_IGN)

    # The never ending fork+gconf/gsettings problems now require
    # us to import Gtk _after_ the fork. This creates a funny race,
    # since we need to parse the command line arguments to know if
    # we need to fork, but need to import Gtk before cli processing
    # so it can handle --g-fatal-args. We strip out our flags first
    # and pass the left overs to gtk
    origargv = sys.argv
    try:
        sys.argv = origargv[:1] + leftovers[:]
        from gi.repository import Gtk  # pylint: disable=E0611
        leftovers = sys.argv[1:]

        # This will error if Gtk wasn't correctly initialized
        Gtk.Window()

        globals()["Gtk"] = Gtk
        import virtManager.config
    except Exception, e:
        # Don't just let the exception raise here. abrt reports bugs
        # when users mess up su/sudo and DISPLAY isn't set. Printing
        # it avoids the issue
        display = os.environ.get("DISPLAY", "")
        msg = str(e)
        if display:
            msg += ": Could not open display: %s" % display
        logging.debug("".join(traceback.format_exc()))
        print msg
        return 1
    finally:
        sys.argv = origargv

    # Do this after the Gtk import so the user has a chance of seeing any error
    if do_drop_stdio:
        drop_stdio()

    if leftovers:
        raise RuntimeError("Unhandled command line options '%s'" % leftovers)

    logging.debug("GTK version: %d.%d.%d",
                  Gtk.get_major_version(),
                  Gtk.get_minor_version(),
                  Gtk.get_micro_version())

    config = virtManager.config.vmmConfig(
        "virt-manager", cliconfig, options.testfirstrun)

    if not util.local_libvirt_version() >= 6000:
        # We need this version for threaded virConnect access
        _show_startup_error(
                _("virt-manager requires libvirt 0.6.0 or later."), "")
        return


    if options.usbredir and config.get_auto_redirection():
        config.set_auto_redirection(False)

    # Add our icon dir to icon theme
    icon_theme = Gtk.IconTheme.get_default()
    icon_theme.prepend_search_path(cliconfig.icon_dir)

    from virtManager.engine import vmmEngine

    Gtk.Window.set_default_icon_name("virt-manager")

    show = None
    if options.show_domain_creator:
        show = "creator"
    elif options.show_domain_editor:
        show = "editor"
    elif options.show_domain_performance:
        show = "performance"
    elif options.show_domain_console:
        show = "console"
    elif options.show_host_summary:
        show = "summary"

    if show and options.uri is None:
        raise RuntimeError("can't use --show-* options without --connect")
    if show:
        options.uuid = (options.uuid or options.show_domain_creator or
                        options.show_domain_editor or
                        options.show_domain_performance or
                        options.show_domain_console or
                        options.show_host_summary)

    # Hook libvirt events into glib main loop
    LibvirtGLib.init(None)
    LibvirtGLib.event_register()

    engine = vmmEngine()
    engine.skip_autostart = options.no_conn_auto
    engine.uri_at_startup = options.uri

    if show:
        def cb(conn):
            ignore = conn
            launch_specific_window(engine, show, options.uri, options.uuid)
            return True
        engine.uri_cb = cb
        engine.show_manager_window = False
        engine.skip_autostart = True

    # Finally start the app for real
    engine.application.run(None)


if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        logging.debug("Received KeyboardInterrupt. Exiting application.")
    except SystemExit:
        raise
    except Exception, run_e:
        if "Gtk" not in globals():
            raise
        _show_startup_error(str(run_e), "".join(traceback.format_exc()))
