#!/usr/bin/env python

# Copyright (C) 2006, Red Hat, Inc.
#
# 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 St, Fifth Floor, Boston, MA  02110-1301  USA

import os
import sys
import socket
import logging 

log = logging.getLogger( 'sugar-emulator' )
log.setLevel( logging.DEBUG )

import pygtk
pygtk.require('2.0')
import gtk
import gobject

from sugar import env

def _get_display_number():
    """Find a free display number trying to connect to 6000+ ports"""
    log.info( "Attempting to find free port for X11 (Xephyr)" )
    retries = 20
    display_number = 1
    display_is_free = False

    while not display_is_free and retries > 0:
        lockstr = "/tmp/.X%d-lock" % display_number
        if not os.path.exists(lockstr):
            s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            try:
                s.connect(('127.0.0.1', 6000 + display_number))
                s.close()
            except:
                display_is_free = True
                break

        display_number += 1
        retries -= 1

    if display_is_free:
        log.info(
            '  Found free port: #%s (%s)',
            display_number, display_number+6000
        )
        return display_number
    else:
        logging.error('Cannot find a free display.')
        sys.exit(0)

def _start_xephyr():
    display = _get_display_number()
    log.info( 'Starting the Xephyr nested X display on display %s', display )

    cmd = [ 'Xephyr' ]
    cmd.append(':%d' % display)
    cmd.append('-ac') 

    if gtk.gdk.screen_width() < 1200 or gtk.gdk.screen_height() < 900:
        cmd.append('-fullscreen')
    else:
        cmd.append('-screen')
        cmd.append('%dx%d' % (1200, 900))

    dpi = gtk.settings_get_default().get_property('gtk-xft-dpi')
    if dpi > 0:
        cmd.append('-dpi')
        cmd.append('%d' % int(dpi/1024))

    log.debug( 'Xephyr command: %s', " ".join( cmd ) )
    result = gobject.spawn_async(cmd, flags=gobject.SPAWN_SEARCH_PATH)
    pid = result[0]

    os.environ['DISPLAY'] = ":%d" % (display)
    os.environ['SUGAR_EMULATOR_PID'] = str(pid)

def _start_matchbox():
    log.info( 'Starting the matchbox window manager' )
    cmd = ['matchbox-window-manager']

    cmd.extend(['-use_titlebar', 'no'])
    cmd.extend(['-theme', 'olpc'])

    log.debug( 'Matchbox command: %s', " ".join( cmd) )
    gobject.spawn_async(cmd, flags=gobject.SPAWN_SEARCH_PATH)

def _setup_env():
    os.environ['SUGAR_EMULATOR'] = 'yes'
    
    source_dir = os.path.dirname(os.path.abspath(__file__))
    if os.path.isfile(os.path.join(source_dir, 'autogen.sh')):
        os.environ['SUGAR_PATH'] = source_dir
        if os.environ.has_key('PYTHONPATH'):
            path = os.environ['PYTHONPATH']
            os.environ['PYTHONPATH'] = source_dir + ':' + path
            log.info( 'Set PYTHONPATH=%s', os.environ['PYTHONPATH'] )

    os.environ['GABBLE_LOGFILE'] = os.path.join(env.get_profile_path(), 'logs', 'telepathy-gabble.log')
    os.environ['SALUT_LOGFILE'] = os.path.join(env.get_profile_path(), 'logs', 'telepathy-salut.log')
    os.environ['STREAM_ENGINE_LOGFILE'] = os.path.join(env.get_profile_path(), 'logs', 'telepathy-stream-engine.log')

def main():
    """Script-level operations"""
    logging.basicConfig()
    _setup_env()
    _start_xephyr()
    
    from sugar import env
    
    if env.is_emulator():
        gtkrc_filename = 'sugar.gtkrc'
    else:
        gtkrc_filename = 'sugar-xo.gtkrc'
    
    os.environ['GTK2_RC_FILES'] = env.get_data_path(gtkrc_filename)
    
    if len(sys.argv) == 1:
        program = 'sugar-shell'
    else:
        _start_matchbox()
        program = sys.argv[1]
    
    command = ['dbus-launch', 'dbus-launch', '--exit-with-session', program]
    log.info( "Attempting to launch sugar to replace this process: %s", " ".join(command) )
    os.execlp( *command )

if __name__ == "__main__":
    main()