#!/usr/bin/env python
# -*- coding: utf-8 -*-

#
# gPodder - A media aggregator and podcast client
# Copyright (c) 2005-2012 Thomas Perl and the gPodder Team
#
# gPodder 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.
#
# gPodder 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/>.
#

"""
gPodder enables you to subscribe to RSS feeds and download
podcast episodes from these feeds.

Downloaded podcasts can either be synchronized to portable
MP3 players (including iPods) or played back on the user's
desktop.

See gpo(1) for the command-line interface.
"""

import sys
import os
import os.path
import platform
import logging

import gettext

import subprocess

try:
    import dbus
    import dbus.glib
    have_dbus = True
except ImportError:
    print >>sys.stderr, """
    Warning: python-dbus not found. Disabling D-Bus support.
    """
    have_dbus = False

from optparse import OptionParser

if __name__ == '__main__':
    # Paths to important files
    gpodder_script = sys.argv[0]
    while os.path.islink(gpodder_script):
        gpodder_script = os.readlink(gpodder_script)
    gpodder_dir = os.path.join(os.path.dirname(gpodder_script), '..')
    prefix = os.path.abspath(os.path.normpath(gpodder_dir))

    src_dir = os.path.join(prefix, 'src')
    data_dir = os.path.join(prefix, 'data')
    locale_dir = os.path.join(prefix, 'share', 'locale')
    ui_folder = os.path.join(prefix, 'share', 'gpodder', 'ui')
    credits_file = os.path.join(prefix, 'share', 'gpodder', 'credits.txt')
    images_folder = os.path.join(prefix, 'share', 'gpodder')
    icon_file = os.path.join(prefix, 'share', 'icons', 'hicolor', 'scalable', 'apps', 'gpodder.svg')

    if os.path.exists(src_dir) and os.path.exists(data_dir) and \
            not prefix.startswith('/usr'):
        # Run gPodder from local source folder (not installed)
        print >>sys.stderr, 'Using modules from', src_dir
        sys.path.insert(0, src_dir)
        print >>sys.stderr, 'Using resources from', data_dir
        locale_dir = os.path.join(data_dir, 'locale')
        ui_folder = os.path.join(data_dir, 'ui')
        credits_file = os.path.join(data_dir, 'credits.txt')
        images_folder = os.path.join(data_dir, 'images')
        icon_file = os.path.join(data_dir, 'gpodder.svg')

    # on Mac OS X, read from the defaults database the locale of the user
    if platform.system() == 'Darwin' and 'LANG' not in os.environ:
        locale_cmd = ('defaults', 'read', 'NSGlobalDomain', 'AppleLocale')
        process = subprocess.Popen(locale_cmd, stdout=subprocess.PIPE)
        output, error_output = process.communicate()
        # the output is a string like 'fr_FR', and we need 'fr_FR.utf-8'
        user_locale = output.strip() + '.UTF-8'
        os.environ['LANG'] = user_locale
        print >>sys.stderr, 'Setting locale to', user_locale

    # Set up the path to translation files
    gettext.bindtextdomain('gpodder', locale_dir)

    import gpodder

    # Platform detection (i.e. Maemo 5, etc..)
    gpodder.detect_platform()

    # Enable i18n for gPodder translations
    _ = gpodder.gettext

    # Set up paths to folder with GtkBuilder files and gpodder.svg
    gpodder.ui_folders.append(ui_folder)
    gpodder.credits_file = credits_file
    gpodder.images_folder = images_folder
    gpodder.icon_file = icon_file

    s_usage = 'usage: %%prog [options]\n\n%s' % ( __doc__.strip() )
    s_version = '%%prog %s' % ( gpodder.__version__ )

    parser = OptionParser( usage = s_usage, version = s_version)

    parser.add_option("-v", "--verbose",
                      action="store_true", dest="verbose", default=False,
                      help=_("Print debugging output to stdout"))

    parser.add_option("-q", "--qml",
                      action="store_true", dest="qml", default=False,
                      help=_("Start the QML interface of gPodder"))

    parser.add_option("-w", "--web",
                      action="store_true", dest="web", default=False,
                      help=_("Start the web interface of gPodder"))

    parser.add_option('-s', '--subscribe', dest='subscribe', metavar='URL',
                      help=_('Subscribe to the given URL'))

    # On Mac OS X, support the "psn" parameter for compatibility (bug 939)
    if sys.platform == 'darwin':
        parser.add_option('-p', '--psn', dest='macpsn', metavar='PSN',
                          help=_('Mac OS X application process number'))

    (options, args) = parser.parse_args(sys.argv)

    if gpodder.ui.desktop:
        gpodder.ui_folders.insert(0, os.path.join(ui_folder, 'desktop'))

    if options.verbose:
        FMT = '%(created)f [%(name)s] %(levelname)s: %(message)s'
        logging.basicConfig(format=FMT, level=logging.DEBUG)
    else:
        logging.basicConfig()

    if options.qml or gpodder.ui.fremantle or gpodder.ui.harmattan:
        from gpodder import qmlui
        gpodder.ui.qt = True
        gpodder.ui_folders.insert(0, os.path.join(ui_folder, 'qml'))
        sys.exit(qmlui.main(args))

    if options.web:
        from gpodder import webui
        webui.main()
        sys.exit(0)

    if have_dbus:
        # Try to find an already-running instance of gPodder
        session_bus = dbus.SessionBus()

        # Obtain a reference to an existing instance; don't call get_object if
        # such an instance doesn't exist as it *will* create a new instance
        if session_bus.name_has_owner(gpodder.dbus_bus_name):
            try:
                remote_object = session_bus.get_object(gpodder.dbus_bus_name, \
                        gpodder.dbus_gui_object_path)
            except dbus.exceptions.DBusException:
                remote_object = None
        else:
            remote_object = None
    else:
        # No D-Bus available :/
        remote_object = None

    if remote_object is not None:
        # An instance of GUI is already running
        print >>sys.stderr, 'Existing instance running - activating via D-Bus.'
        remote_object.show_gui_window(dbus_interface=gpodder.dbus_interface)
        if options.subscribe:
            remote_object.subscribe_to_url(options.subscribe)
    else:
        # gPodder is not yet running - create new instance
        from gpodder.gtkui import main
        gpodder.ui.gtk = True

        # check if we have an X11 connection (but not on Windows)
        if platform.system() != 'Windows' and \
                not os.environ.get('DISPLAY', None):
            print >>sys.stderr, 'Cannot start gPodder: $DISPLAY is not set.'
            sys.exit(1)

        main.main(options)

