# UpdateManager.py 
#  
#  Copyright (c) 2004-2006 Canonical
#                2004 Michiel Sikkes
#                2005 Martin Willemoes Hansen
#  
#  Author: Michiel Sikkes <michiel@eyesopened.nl>
#          Michael Vogt <mvo@debian.org>
#          Martin Willemoes Hansen <mwh@sysrq.dk>
# 
#  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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
#  USA

import pygtk
pygtk.require('2.0')
import gtk
import gtk.gdk
import gtk.glade
try:
    import gconf
except:
    import fakegconf as gconf
import gobject
import warnings
warnings.filterwarnings("ignore", "apt API not stable yet", FutureWarning)
import apt
import apt_pkg

import gettext
import copy
import string
import sys
import os
import os.path
import urllib2
import re
import locale
import tempfile
import pango
import subprocess
import pwd
import time
import thread
import xml.sax.saxutils
from Common.HelpViewer import HelpViewer

import dbus
import dbus.service
import dbus.glib

from gettext import gettext as _

from Common.utils import *
from Common.SimpleGladeApp import SimpleGladeApp
from DistUpgradeFetcher import DistUpgradeFetcher
import GtkProgress

from MetaRelease import Dist, MetaRelease

#import pdb

# FIXME:
# - kill "all_changes" and move the changes into the "Update" class

# list constants
(LIST_CONTENTS, LIST_NAME, LIST_PKG) = range(3)

# actions for "invoke_manager"
(INSTALL, UPDATE) = range(2)

SYNAPTIC_PINFILE = "/var/lib/synaptic/preferences"

CHANGELOGS_URI="http://changelogs.ubuntu.com/changelogs/pool/%s/%s/%s/%s_%s/changelog"


class MyCache(apt.Cache):
    def __init__(self, progress):
        apt.Cache.__init__(self, progress)
        self._initDepCache()
        assert self._depcache.BrokenCount == 0 and self._depcache.DelCount == 0
        self.all_changes = {}
    def _initDepCache(self):
        #apt_pkg.Config.Set("Debug::pkgPolicy","1")
        #self.depcache = apt_pkg.GetDepCache(self.cache)
        #self._depcache = apt_pkg.GetDepCache(self._cache)
        self._depcache.ReadPinFile()
        if os.path.exists(SYNAPTIC_PINFILE):
            self._depcache.ReadPinFile(SYNAPTIC_PINFILE)
        self._depcache.Init()
    def clear(self):
        self._initDepCache()
    @property
    def requiredDownload(self):
        """ get the size of the packages that are required to download """
        pm = apt_pkg.GetPackageManager(self._depcache)
        fetcher = apt_pkg.GetAcquire()
        pm.GetArchives(fetcher, self._list, self._records)
        return fetcher.FetchNeeded
    @property
    def installCount(self):
        return self._depcache.InstCount
    def saveDistUpgrade(self):
        """ this functions mimics a upgrade but will never remove anything """
        self._depcache.Upgrade(True)
        if self._depcache.DelCount > 0:
            self.clear()
        assert self._depcache.BrokenCount == 0 and self._depcache.DelCount == 0
        self._depcache.Upgrade()

    def get_changelog(self, name, lock):
        # don't touch the gui in this function, it needs to be thread-safe
        pkg = self[name]

        # get the src package name
        srcpkg = pkg.sourcePackageName

        # assume "main" section 
        src_section = "main"
        # use the section of the candidate as a starting point
        section = pkg._depcache.GetCandidateVer(pkg._pkg).Section

        # get the source version, start with the binaries version
        binver = pkg.candidateVersion
        srcver = pkg.candidateVersion
        #print "bin: %s" % binver
        try:
            # try to get the source version of the pkg, this differs
            # for some (e.g. libnspr4 on ubuntu)
            # this feature only works if the correct deb-src are in the 
            # sources.list
            # otherwise we fall back to the binary version number
            srcrecords = apt_pkg.GetPkgSrcRecords()
            srcrec = srcrecords.Lookup(srcpkg)
            if srcrec:
                srcver = srcrecords.Version
                if apt_pkg.VersionCompare(binver, srcver) > 0:
                    srcver = binver
                #print "srcver: %s" % srcver
                section = srcrecords.Section
                #print "srcsect: %s" % section
            else:
                # fail into the error handler
                raise SystemError
        except SystemError, e:
            srcver = binver

        l = section.split("/")
        if len(l) > 1:
            src_section = l[0]

        # lib is handled special
        prefix = srcpkg[0]
        if srcpkg.startswith("lib"):
            prefix = "lib" + srcpkg[3]

        # stip epoch
        l = string.split(srcver,":")
        if len(l) > 1:
            srcver = "".join(l[1:])

        try:
            uri = CHANGELOGS_URI % (src_section,prefix,srcpkg,srcpkg, srcver)
            # print "Trying: %s " % uri
            changelog = urllib2.urlopen(uri)
            #print changelog.read()
            # do only get the lines that are new
            alllines = ""
            regexp = "^%s \((.*)\)(.*)$" % (re.escape(srcpkg))

            i=0
            while True:
                line = changelog.readline()
                if line == "":
                    break
                match = re.match(regexp,line)
                if match:
                    # FIXME: the installed version can have a epoch, but th
                    #        changelog does not have one, we do a dumb
                    #        approach here and just strip it away, but I'm
                    #        sure that this can lead to problems
                    installed = pkg.installedVersion
                    if installed and ":" in installed:
                        installed = installed.split(":",1)[1]
                    if installed and \
                        apt_pkg.VersionCompare(match.group(1),installed)<=0:
                        break
                # EOF (shouldn't really happen)
                alllines = alllines + line

            # Print an error if we failed to extract a changelog
            if len(alllines) == 0:
                alllines = _("The list of changes is not available")
            # only write if we where not canceld
            if lock.locked():
                self.all_changes[name] = [alllines, srcpkg]
        except urllib2.HTTPError:
            if lock.locked():
                self.all_changes[name] = [_("The list of changes is not "
                                            "available yet. Please try again "
                                            "later."), srcpkg]
        except IOError:
            if lock.locked():
                self.all_changes[name] = [_("Failed to download the list "
                                            "of changes. Please "
                                            "check your Internet "
                                            "connection."), srcpkg]
        if lock.locked():
            lock.release()

class UpdateList:
  class UpdateOrigin:
    def __init__(self, desc, importance):
      self.packages = []
      self.importance = importance
      self.description = desc

  def __init__(self):
    # a map of packages under their origin
    pipe = os.popen("lsb_release -c -s")
    dist = pipe.read().strip()
    del pipe

    templates = [("%s-security" % dist, "Ubuntu", _("Important security updates")
                                                    , 10),
                 ("%s-updates" % dist, "Ubuntu", _("Recommended updates"), 9),
                 ("%s-proposed" % dist, "Ubuntu", _("Proposed updates"), 8),
                 ("%s-backports" % dist, "Ubuntu", _("Backports"), 7),
                 (dist, "Ubuntu", _("Normal updates"), 6)]

    self.pkgs = {}
    self.matcher = {}
    self.num_updates = 0
    for (origin, archive, desc, importance) in templates:
        self.matcher[(origin, archive)] = self.UpdateOrigin(desc, importance)
    self.unknown_origin = self.UpdateOrigin(_("Other updates"), -1)

  def update(self, cache):
    self.held_back = []

    # do the upgrade
    cache.saveDistUpgrade()

    # sort by origin
    for pkg in cache:
      if pkg.isUpgradable:
        if pkg.candidateOrigin == None:
            # can happen for e.g. loged packages
            # FIXME: do something more sensible here (but what?)
            print "WARNING: upgradable but no canidateOrigin?!?: ", pkg.name
            continue
        # TRANSLATORS: updates from an 'unknown' origin
        originstr = _("Other updates")
        for aorigin in pkg.candidateOrigin:
          archive = aorigin.archive
          origin = aorigin.origin
        if self.matcher.has_key((archive,origin)) and aorigin.trusted:
          origin_node = self.matcher[(archive,origin)]
        else:
          origin_node = self.unknown_origin
        if not self.pkgs.has_key(origin_node):
          self.pkgs[origin_node] = []
        self.pkgs[origin_node].append(pkg)
        self.num_updates = self.num_updates + 1
      if pkg.isUpgradable and not (pkg.markedUpgrade or pkg.markedInstall):
          self.held_back.append(pkg.name)
    for l in self.pkgs.keys():
      self.pkgs[l].sort(lambda x,y: cmp(x.name,y.name))
    self.keepcount = cache._depcache.KeepCount


class UpdateManagerDbusControler(dbus.service.Object):
    """ this is a helper to provide the UpdateManagerIFace """
    def __init__(self, parent, bus_name,
                 object_path='/org/freedesktop/UpdateManagerObject'):
        dbus.service.Object.__init__(self, bus_name, object_path)
        self.parent = parent

    @dbus.service.method('org.freedesktop.UpdateManagerIFace')
    def bringToFront(self):
        self.parent.window_main.present()
        return True

class UpdateManager(SimpleGladeApp):

  def __init__(self, datadir):
    self.setupDbus()
    gtk.window_set_default_icon_name("update-manager")

    self.datadir = datadir
    SimpleGladeApp.__init__(self, datadir+"glade/UpdateManager.glade",
                            None, domain="update-manager")

    self.image_logo.set_from_icon_name("update-manager", gtk.ICON_SIZE_DIALOG)
    self.window_main.set_sensitive(False)
    self.window_main.grab_focus()
    self.button_close.grab_focus()

    self.dl_size = 0

    # create text view
    changes_buffer = self.textview_changes.get_buffer()
    changes_buffer.create_tag("versiontag", weight=pango.WEIGHT_BOLD)

    # expander
    self.expander_details.connect("notify::expanded", self.activate_details)

    # useful exit stuff
    self.window_main.connect("delete_event", self.close)
    self.button_close.connect("clicked", lambda w: self.exit())

    # the treeview (move into it's own code!)
    self.store = gtk.ListStore(str, str, gobject.TYPE_PYOBJECT)
    self.treeview_update.set_model(self.store)
    self.treeview_update.set_headers_clickable(True);

    tr = gtk.CellRendererText()
    tr.set_property("xpad", 6)
    tr.set_property("ypad", 6)
    cr = gtk.CellRendererToggle()
    cr.set_property("activatable", True)
    cr.set_property("xpad", 6)
    cr.connect("toggled", self.toggled)

    column_install = gtk.TreeViewColumn("Install", cr)
    column_install.set_cell_data_func (cr, self.install_column_view_func)
    column = gtk.TreeViewColumn("Name", tr, markup=LIST_CONTENTS)
    column.set_cell_data_func (tr, self.package_column_view_func)
    column.set_resizable(True)
    major,minor,patch = gtk.pygtk_version
    if (major >= 2) and (minor >= 5):
      column_install.set_sizing(gtk.TREE_VIEW_COLUMN_FIXED)
      column_install.set_fixed_width(30)
      column.set_sizing(gtk.TREE_VIEW_COLUMN_FIXED)
      column.set_fixed_width(100)
      #self.treeview_update.set_fixed_height_mode(True)

    self.treeview_update.append_column(column_install)
    column_install.set_visible(True)
    self.treeview_update.append_column(column)
    self.treeview_update.set_search_column(LIST_NAME)
    self.treeview_update.connect("button-press-event", self.show_context_menu)


    # proxy stuff
    # FIXME: move this into it's own function
    SYNAPTIC_CONF_FILE = "%s/.synaptic/synaptic.conf" % pwd.getpwuid(0)[5]
    if os.path.exists(SYNAPTIC_CONF_FILE):
      cnf = apt_pkg.newConfiguration()
      apt_pkg.ReadConfigFile(cnf, SYNAPTIC_CONF_FILE)
      use_proxy = cnf.FindB("Synaptic::useProxy", False)
      if use_proxy:
        proxy_host = cnf.Find("Synaptic::httpProxy")
        proxy_port = str(cnf.FindI("Synaptic::httpProxyPort"))
        if proxy_host and proxy_port:
	  # FIXME: set the proxy for libapt here as well (e.g. for the
	  #        DistUpgradeFetcher
          proxy_support = urllib2.ProxyHandler({"http":"http://%s:%s" % (proxy_host, proxy_port)})
          opener = urllib2.build_opener(proxy_support)
          urllib2.install_opener(opener)
	  # install a proxy environment too
	  if not os.environ.has_key("http_proxy"):
		  os.putenv("http_proxy",
			    "http://%s:%s/" % (proxy_host, proxy_port))

    # setup the help viewer and disable the help button if there
    # is no viewer available
    self.help_viewer = HelpViewer("update-manager")
    if self.help_viewer.check() == False:
        self.button_help.set_sensitive(False)

    self.gconfclient = gconf.client_get_default()
    # restore state
    self.restore_state()
    self.window_main.show()

  def header_column_func(self, cell_layout, renderer, model, iter):
    pkg = model.get_value(iter, LIST_PKG)
    if pkg == None:
      renderer.set_property("sensitive", False)
    else:
      renderer.set_property("sensitive", True)

  def install_column_view_func(self, cell_layout, renderer, model, iter):
    self.header_column_func(cell_layout, renderer, model, iter)
    pkg = model.get_value(iter, LIST_PKG)
    # hide it if we are only a header line
    renderer.set_property("visible", pkg != None)
    if pkg is None:
        return
    to_install = pkg.markedInstall or pkg.markedUpgrade
    renderer.set_property("active", to_install)
    if pkg.name in self.list.held_back:
        renderer.set_property("activatable", False)
    else: 
        renderer.set_property("activatable", True)

  def package_column_view_func(self, cell_layout, renderer, model, iter):
    self.header_column_func(cell_layout, renderer, model, iter)
      
  def setupDbus(self):
    """ this sets up a dbus listener if none is installed alread """
    # check if there is another g-a-i already and if not setup one
    # listening on dbus
    try:
        bus = dbus.SessionBus()
    except:
        print "warning: could not initiate dbus"
        return
    proxy_obj = bus.get_object('org.freedesktop.UpdateManager', 
                               '/org/freedesktop/UpdateManagerObject')
    iface = dbus.Interface(proxy_obj, 'org.freedesktop.UpdateManagerIFace')
    try:
        iface.bringToFront()
        #print "send bringToFront"
        sys.exit(0)
    except dbus.DBusException, e:
         print "no listening object (%s) "% e
         bus_name = dbus.service.BusName('org.freedesktop.UpdateManager',bus)
         self.dbusControler = UpdateManagerDbusControler(self, bus_name)


  def on_checkbutton_reminder_toggled(self, checkbutton):
    self.gconfclient.set_bool("/apps/update-manager/remind_reload",
                              not checkbutton.get_active())

  def close(self, widget, data=None):
    if self.window_main.get_property("sensitive") is False:
        return True
    else:
        self.exit()

  
  def set_changes_buffer(self, changes_buffer, text, name, srcpkg):
    changes_buffer.set_text("")
    lines = text.split("\n")
    if len(lines) == 1:
      changes_buffer.set_text(text)
      return
    
    for line in lines:
      end_iter = changes_buffer.get_end_iter()
      version_match = re.match(r'^%s \((.*)\)(.*)\;.*$' % re.escape(srcpkg), line)
      #bullet_match = re.match("^.*[\*-]", line)
      author_match = re.match("^.*--.*<.*@.*>.*$", line)
      if version_match:
        version = version_match.group(1)
	upload_archive = version_match.group(2).strip()
        version_text = _("Version %s: \n") % version
        changes_buffer.insert_with_tags_by_name(end_iter, version_text, "versiontag")
      elif (author_match):
        pass
      else:
        changes_buffer.insert(end_iter, line+"\n")
        

  def on_treeview_update_cursor_changed(self, widget):
    tuple = widget.get_cursor()
    path = tuple[0]
    # check if we have a path at all
    if path == None:
      return
    model = widget.get_model()
    iter = model.get_iter(path)

    # set descr
    pkg = model.get_value(iter, LIST_PKG)
    if pkg == None or pkg.description == None:
      changes_buffer = self.textview_changes.get_buffer()
      changes_buffer.set_text("")
      desc_buffer = self.textview_descr.get_buffer()
      desc_buffer.set_text("")
      self.notebook_details.set_sensitive(False)
      return
    long_desc = pkg.description
    self.notebook_details.set_sensitive(True)
    # Skip the first line - it's a duplicate of the summary
    i = long_desc.find("\n")
    long_desc = long_desc[i+1:]
    # do some regular expression magic on the description
    # Add a newline before each bullet
    p = re.compile(r'^(\s|\t)*(\*|0|-)',re.MULTILINE)
    long_desc = p.sub('\n*', long_desc)
    # replace all newlines by spaces
    p = re.compile(r'\n', re.MULTILINE)
    long_desc = p.sub(" ", long_desc)
    # replace all multiple spaces by newlines
    p = re.compile(r'\s\s+', re.MULTILINE)
    long_desc = p.sub("\n", long_desc)

    desc_buffer = self.textview_descr.get_buffer()
    desc_buffer.set_text(long_desc)

    # now do the changelog
    name = model.get_value(iter, LIST_NAME)
    if name == None:
      return

    changes_buffer = self.textview_changes.get_buffer()
    
    # check if we have the changes already
    if self.cache.all_changes.has_key(name):
      changes = self.cache.all_changes[name]
      self.set_changes_buffer(changes_buffer, changes[0], name, changes[1])
    else:
      if self.expander_details.get_expanded():
        lock = thread.allocate_lock()
        lock.acquire()
        t=thread.start_new_thread(self.cache.get_changelog,(name,lock))
        changes_buffer.set_text("%s\n" % _("Downloading list of changes..."))
        iter = changes_buffer.get_iter_at_line(1)
        anchor = changes_buffer.create_child_anchor(iter)
        button = gtk.Button(stock="gtk-cancel")
        self.textview_changes.add_child_at_anchor(button, anchor)
        button.show()
        id = button.connect("clicked",
                            lambda w,lock: lock.release(), lock)
        # wait for the dl-thread
        while lock.locked():
          time.sleep(0.05)
          while gtk.events_pending():
            gtk.main_iteration()
        # download finished (or canceld, or time-out)
        button.hide()
        button.disconnect(id);

    if self.cache.all_changes.has_key(name):
      changes = self.cache.all_changes[name]
      self.set_changes_buffer(changes_buffer, changes[0], name, changes[1])

  def show_context_menu(self, widget, event):
    """
    Show a context menu if a right click was performed on an update entry
    """
    if event.type == gtk.gdk.BUTTON_PRESS and event.button == 3:
        menu = gtk.Menu()
        item_select_none = gtk.MenuItem(_("_Uncheck All"))
        item_select_none.connect("activate", self.select_none_updgrades)
        menu.add(item_select_none)
        num_updates = self.cache.installCount
        if num_updates == 0:
            item_select_none.set_property("sensitive", False)
        item_select_all = gtk.MenuItem(_("_Check All"))
        item_select_all.connect("activate", self.select_all_updgrades)
        menu.add(item_select_all)
        menu.popup(None, None, None, 0, event.time)
        menu.show_all()
        return True

  def select_all_updgrades(self, widget):
    """
    Select all updates
    """
    self.setBusy(True)
    self.cache.saveDistUpgrade()
    self.treeview_update.queue_draw()
    self.setBusy(False)

  def select_none_updgrades(self, widget):
    """
    Select none updates
    """
    self.setBusy(True)
    self.cache.clear()
    self.treeview_update.queue_draw()
    self.setBusy(False)

  def humanize_size(self, bytes):
      """
      Convert a given size in bytes to a nicer better readable unit
      """
      if bytes == 0:
          # TRANSLATORS: download size is 0
          return _("None")
      elif bytes < 1024:
          # TRANSLATORS: download size of very small updates
          return _("1 KB")
      elif bytes < 1024 * 1024:
          # TRANSLATORS: download size of small updates, e.g. "250 KB"
          return locale.format(_("%.0f KB"), bytes/1024)
      else:
          # TRANSLATORS: download size of updates, e.g. "2.3 MB"
          return locale.format(_("%.1f MB"), bytes / 1024 / 1024)

  def setBusy(self, flag):
      """ Show a watch cursor if the app is busy for more than 0.3 sec.
      Furthermore provide a loop to handle user interface events """
      if self.window_main.window is None:
          return
      if flag == True:
          self.window_main.window.set_cursor(gtk.gdk.Cursor(gtk.gdk.WATCH))
      else:
          self.window_main.window.set_cursor(None)
      while gtk.events_pending():
          gtk.main_iteration()

  def refresh_updates_count(self):
      self.button_install.set_sensitive(self.cache.installCount)
      self.dl_size = self.cache.requiredDownload
      # TRANSLATORS: b stands for Bytes
      self.label_downsize.set_markup(_("Download size: %s" % \
                                       self.humanize_size(self.dl_size)))
      
  def update_count(self):
      """activate or disable widgets and show dialog texts correspoding to
         the number of available updates"""
      self.refresh_updates_count()
      num_updates = self.cache.installCount
      if num_updates == 0:
          text_header= "<big><b>"+_("Your system is up-to-date")+"</b></big>"
          text_download = ""
          self.notebook_details.set_sensitive(False)
          self.treeview_update.set_sensitive(False)
          self.button_install.set_sensitive(False)
          self.label_downsize.set_text=""
          self.button_close.grab_default()
          self.textview_changes.get_buffer().set_text("")
          self.textview_descr.get_buffer().set_text("")
      else:
          text_header = "<big><b>" + \
                        gettext.ngettext("You can install %s update",
                                         "You can install %s updates", 
                                         num_updates) % \
                                         num_updates + "</b></big>"
          text_download = _("Download size: %s") % self.humanize_size(self.dl_size)
          self.notebook_details.set_sensitive(True)
          self.treeview_update.set_sensitive(True)
          self.button_install.grab_default()
          self.treeview_update.set_cursor(1)
      self.label_header.set_markup(text_header)
      self.label_downsize.set_markup(text_download)

  def activate_details(self, expander, data):
    expanded = self.expander_details.get_expanded()
    self.vbox_updates.set_child_packing(self.expander_details,
                                        expanded,
                                        True,
                                        0,
                                        True)
    self.gconfclient.set_bool("/apps/update-manager/show_details",expanded)
    if expanded:
      self.on_treeview_update_cursor_changed(self.treeview_update)

  def run_synaptic(self, id, action, lock):
    try:
      apt_pkg.PkgSystemUnLock()
    except SystemError:
      pass
    cmd = ["gksu", "--desktop", "/usr/share/applications/update-manager.desktop", 
           "--", "/usr/sbin/synaptic", "--hide-main-window",  
           "--non-interactive", "--parent-window-id", "%s" % (id) ]
    if action == INSTALL:
      cmd.append("--progress-str")
      cmd.append("%s" % _("Please wait, this can take some time."))
      cmd.append("--finish-str")
      cmd.append("%s" %  _("Update is complete"))
      f = tempfile.NamedTemporaryFile()
      for pkg in self.cache:
          if pkg.markedInstall or pkg.markedUpgrade:
              f.write("%s\tinstall\n" % pkg.name)
      cmd.append("--set-selections-file")
      cmd.append("%s" % f.name)
      f.flush()
      subprocess.call(cmd)
      f.close()
    elif action == UPDATE:
      cmd.append("--update-at-startup")
      subprocess.call(cmd)
    else:
      print "run_synaptic() called with unknown action"
      sys.exit(1)
    lock.release()

  def on_button_reload_clicked(self, widget):
    #print "on_button_reload_clicked"
    self.invoke_manager(UPDATE)

  def on_button_help_clicked(self, widget):
    self.help_viewer.run()

  def on_button_install_clicked(self, widget):
    #print "on_button_install_clicked"
    self.invoke_manager(INSTALL)

  def invoke_manager(self, action):
    # check first if no other package manager is runing

    # don't display apt-listchanges, we already showed the changelog
    os.environ["APT_LISTCHANGES_FRONTEND"]="none"

    # Do not suspend during the update process
    (dev, cookie) = self.inhibit_sleep()

    # set window to insensitive
    self.window_main.set_sensitive(False)
    self.window_main.window.set_cursor(gtk.gdk.Cursor(gtk.gdk.WATCH))
    lock = thread.allocate_lock()
    lock.acquire()
    t = thread.start_new_thread(self.run_synaptic,
                                (self.window_main.window.xid,action,lock))
    while lock.locked():
      while gtk.events_pending():
        gtk.main_iteration()
      time.sleep(0.05)
    while gtk.events_pending():
      gtk.main_iteration()
    self.label_cache_progress_title.set_label("<b><big>%s</big></b>" % _("Checking for updates"))
    self.fillstore()

    # Allow suspend after synaptic is finished
    if cookie != False:
        self.allow_sleep(dev, cookie)
    self.window_main.set_sensitive(True)
    self.window_main.window.set_cursor(None)


  def inhibit_sleep(self):
    """Send a dbus signal to gnome-power-manager to not suspend
    the system"""
    try:
      bus = dbus.Bus(dbus.Bus.TYPE_SESSION)
      devobj = bus.get_object('org.gnome.PowerManager', 
                              '/org/gnome/PowerManager')
      dev = dbus.Interface(devobj, "org.gnome.PowerManager")
      cookie = dev.Inhibit('UpdateManager', 'Updating system')
      return (dev, cookie)
    except Exception, e:
      print "could not send the dbus Inhibit signal: %s" % e
      return (False, False)

  def allow_sleep(self, dev, cookie):
    """Send a dbus signal to gnome-power-manager to allow a suspending
    the system"""
    dev.UnInhibit(cookie)

  def toggled(self, renderer, path):
    """ a toggle button in the listview was toggled """
    iter = self.store.get_iter(path)
    pkg = self.store.get_value(iter, LIST_PKG)
    # make sure that we don't allow to toggle deactivated updates
    # this is needed for the call by the row activation callback
    if pkg.name in self.list.held_back:
        return False
    self.setBusy(True)
    # update the cache
    if pkg.markedInstall or pkg.markedUpgrade:
        pkg.markKeep()
        if self.cache._depcache.BrokenCount:
            Fix = apt_pkg.GetPkgProblemResolver(self.cache._depcache)
            Fix.ResolveByKeep()
    else:
        pkg.markInstall()
    self.treeview_update.queue_draw()
    self.refresh_updates_count()
    self.setBusy(False)

  def on_treeview_update_row_activated(self, treeview, path, column, *args):
      """
      If an update row was activated (by pressing space), toggle the 
      install check box
      """
      self.toggled(None, path)

  def exit(self):
    """ exit the application, save the state """
    self.save_state()
    gtk.main_quit()
    sys.exit(0)

  def save_state(self):
    """ save the state  (window-size for now) """
    (x,y) = self.window_main.get_size()
    self.gconfclient.set_pair("/apps/update-manager/window_size",
                              gconf.VALUE_INT, gconf.VALUE_INT, x, y)

  def restore_state(self):
    """ restore the state (window-size for now) """
    expanded = self.gconfclient.get_bool("/apps/update-manager/show_details")
    self.expander_details.set_expanded(expanded)
    self.vbox_updates.set_child_packing(self.expander_details,
                                        expanded,
                                        True,
                                        0,
                                        True)
    (x,y) = self.gconfclient.get_pair("/apps/update-manager/window_size",
                                      gconf.VALUE_INT, gconf.VALUE_INT)
    if x > 0 and y > 0:
      self.window_main.resize(x,y)

  def fillstore(self):
    # use the watch cursor
    self.setBusy(True)

    # clean most objects
    self.dl_size = 0
    self.initCache()
    self.store.clear()
    self.list = UpdateList()

    # fill them again
    self.list.update(self.cache)
    if self.list.num_updates > 0:
      origin_list = self.list.pkgs.keys()
      origin_list.sort(lambda x,y: cmp(x.importance,y.importance))
      origin_list.reverse()
      for origin in origin_list:
        self.store.append(['<b><big>%s</big></b>' % origin.description,
                           origin.description, None])
        for pkg in self.list.pkgs[origin]:
          name = xml.sax.saxutils.escape(pkg.name)
          summary = xml.sax.saxutils.escape(pkg.summary)
          contents = "<b>%s</b>\n<small>%s\n" % (name, summary)
          if pkg.installedVersion != None:
              contents += _("From version %s to %s") % \
                           (pkg.installedVersion,
                            pkg.candidateVersion)
          else:
              contents += _("Version %s") % pkg.candidateVersion
          #TRANSLATORS: the b stands for Bytes
          contents += " " + _("(Size: %s)") % self.humanize_size(pkg.packageSize)
          contents += "</small>"

          self.store.append([contents, pkg.name, pkg])
    self.update_count()
    self.setBusy(False)
    self.check_all_updates_installable()
    return False

  def dist_no_longer_supported(self, meta_release):
    msg = "<big><b>%s</b></big>\n\n%s" % \
          (_("Your distribution is not supported anymore"),
	   _("You will not get any further security fixes or critical "
             "updates. "
             "Upgrade to a later version of Ubuntu Linux. See "
             "http://www.ubuntu.com for more information on "
             "upgrading."))
    dialog = gtk.MessageDialog(self.window_main, 0, gtk.MESSAGE_WARNING,
                               gtk.BUTTONS_CLOSE,"")
    dialog.set_title("")
    dialog.set_markup(msg)
    dialog.run()
    dialog.destroy()
    
  def on_button_dist_upgrade_clicked(self, button):
      #print "on_button_dist_upgrade_clicked"
      fetcher = DistUpgradeFetcher(self, self.new_dist)
      fetcher.run()
      
  def new_dist_available(self, meta_release, upgradable_to):
    self.frame_new_release.show()
    self.label_new_release.set_markup(_("<b>New distribution release '%s' is available</b>") % upgradable_to.version)
    self.new_dist = upgradable_to
    

  # fixme: we should probably abstract away all the stuff from libapt
  def initCache(self): 
    # get the lock
    try:
        apt_pkg.PkgSystemLock()
    except SystemError, e:
        pass
        #d = gtk.MessageDialog(parent=self.window_main,
        #                      flags=gtk.DIALOG_MODAL,
        #                      type=gtk.MESSAGE_ERROR,
        #                      buttons=gtk.BUTTONS_CLOSE)
        #d.set_markup("<big><b>%s</b></big>\n\n%s" % (
        #    _("Only one software management tool is allowed to "
        #      "run at the same time"),
        #    _("Please close the other application e.g. 'aptitude' "
        #      "or 'Synaptic' first.")))
        #print "error from apt: '%s'" % e
        #d.set_title("")
        #res = d.run()
        #d.destroy()
        #sys.exit()

    try:
        progress = GtkProgress.GtkOpProgress(self.dialog_cacheprogress,
                                             self.progressbar_cache,
                                             self.label_cache,
                                             self.window_main)
        self.cache = MyCache(progress)
    except AssertionError:
        # we assert a clean cache
        msg=("<big><b>%s</b></big>\n\n%s"% \
             (_("Software index is broken"),
              _("It is impossible to install or remove any software. "
                "Please use the package manager \"Synaptic\" or run "
		"\"sudo apt-get install -f\" in a terminal to fix "
		"this issue at first.")))
        dialog = gtk.MessageDialog(self.window_main,
                                   0, gtk.MESSAGE_ERROR,
                                   gtk.BUTTONS_CLOSE,"")
        dialog.set_markup(msg)
        dialog.vbox.set_spacing(6)
        dialog.run()
        dialog.destroy()
        sys.exit(1)
    else:
        progress.hide()

  def check_auto_update(self):
      # Check if automatic update is enabled. If not show a dialog to inform
      # the user about the need of manual "reloads"
      remind = self.gconfclient.get_bool("/apps/update-manager/remind_reload")
      if remind == False:
          return

      update_days = apt_pkg.Config.FindI("APT::Periodic::Update-Package-Lists")
      if update_days < 1:
          self.dialog_manual_update.set_transient_for(self.window_main)
          res = self.dialog_manual_update.run()
          self.dialog_manual_update.hide()
          if res == gtk.RESPONSE_YES:
              self.on_button_reload_clicked(None)

  def check_all_updates_installable(self):
    """ Check if all available updates can be installed and suggest
        to run a distribution upgrade if not """
    if self.list.keepcount > 0:
      self.dialog_dist_upgrade.set_transient_for(self.window_main)
      res = self.dialog_dist_upgrade.run()
      self.dialog_dist_upgrade.hide()
      if res == gtk.RESPONSE_YES:
          os.execl("/usr/bin/gksu",
                   "/usr/bin/gksu", "--desktop",
                   "/usr/share/applications/update-manager.desktop",
                   "--", "/usr/bin/update-manager", "--dist-upgrade")

  def main(self, options):
    gconfclient = gconf.client_get_default() 
    self.meta = MetaRelease(options.devel_release)
    self.meta.connect("dist_no_longer_supported",self.dist_no_longer_supported)

    # check if we are interessted in dist-upgrade information
    # (we are not by default on dapper)
    if options.check_dist_upgrades or \
	   gconfclient.get_bool("/apps/update-manager/check_dist_upgrades"):
      self.meta.connect("new_dist_available",self.new_dist_available)
    
    while gtk.events_pending():
      gtk.main_iteration()

    self.fillstore()
    self.check_auto_update()
    gtk.main()