#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Primitivus: a SAT frontend
# Copyright (C) 2009-2016 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 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 Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


from sat.core.i18n import _, D_
from sat_frontends.primitivus.constants import Const as C
from sat.core import log_config
log_config.satConfigure(C.LOG_BACKEND_STANDARD, C)
from sat.core import log as logging
log = logging.getLogger(__name__)
from sat.tools import config as sat_config
import urwid
from urwid.util import is_wide_char
from urwid_satext import sat_widgets
from sat_frontends.quick_frontend.quick_app import QuickApp
from sat_frontends.quick_frontend import quick_utils
from sat_frontends.quick_frontend import quick_chat
from sat_frontends.primitivus.profile_manager import ProfileManager
from sat_frontends.primitivus.contact_list import ContactList
from sat_frontends.primitivus.chat import Chat
from sat_frontends.primitivus import xmlui
from sat_frontends.primitivus.progress import Progress
from sat_frontends.primitivus.notify import Notify
from sat_frontends.primitivus.keys import action_key_map as a_key
from sat_frontends.primitivus import config
from sat_frontends.tools.misc import InputHistory
from sat.tools.common import dynamic_import
from sat_frontends.tools import jid
import signal
import sys
## bridge handling
# we get bridge name from conf and initialise the right class accordingly
main_config = sat_config.parseMainConf()
bridge_name = sat_config.getConfig(main_config, '', 'bridge', 'dbus')
if 'dbus' not in bridge_name:
    print(u"only D-Bus bridge is currently supported")
    sys.exit(3)


class EditBar(sat_widgets.ModalEdit):
    """
    The modal edit bar where you would enter messages and commands.
    """

    def __init__(self, host):
        modes = {None: (C.MODE_NORMAL, u''),
                 a_key['MODE_INSERTION']: (C.MODE_INSERTION, u'> '),
                 a_key['MODE_COMMAND']: (C.MODE_COMMAND, u':')} #XXX: captions *MUST* be unicode
        super(EditBar, self).__init__(modes)
        self.host = host
        self.setCompletionMethod(self._text_completion)
        urwid.connect_signal(self, 'click', self.onTextEntered)

    def _text_completion(self, text, completion_data, mode):
        if mode == C.MODE_INSERTION:
            if self.host.selected_widget is not None:
                try:
                    completion = self.host.selected_widget.completion
                except AttributeError:
                    return text
                else:
                    return completion(text, completion_data)
        else:
            return text

    def onTextEntered(self, editBar):
        """Called when text is entered in the main edit bar"""
        if self.mode == C.MODE_INSERTION:
            if isinstance(self.host.selected_widget, quick_chat.QuickChat):
                chat_widget = self.host.selected_widget
                self.host.messageSend(
                    chat_widget.target,
                    {'': editBar.get_edit_text()}, # TODO: handle language
                    mess_type = C.MESS_TYPE_GROUPCHAT if chat_widget.type == C.CHAT_GROUP else C.MESS_TYPE_CHAT, # TODO: put this in QuickChat
                    errback=lambda failure: self.host.showDialog(_("Error while sending message ({})").format(failure), type="error"),
                    profile_key=chat_widget.profile
                    )
                editBar.set_edit_text('')
        elif self.mode == C.MODE_COMMAND:
            self.commandHandler()

    def commandHandler(self):
        #TODO: separate class with auto documentation (with introspection)
        #      and completion method
        tokens = self.get_edit_text().split(' ')
        command, args = tokens[0], tokens[1:]
        if command == 'quit':
            self.host.onExit()
            raise urwid.ExitMainLoop()
        elif command == 'messages':
            wid = sat_widgets.GenericList(logging.memoryGet())
            self.host.selectWidget(wid)
        # FIXME: reactivate the command
        # elif command == 'presence':
        #     values = [value for value in commonConst.PRESENCE.keys()]
        #     values = [value if value else 'online' for value in values]  # the empty value actually means 'online'
        #     if args and args[0] in values:
        #         presence = '' if args[0] == 'online' else args[0]
        #         self.host.status_bar.onChange(user_data=sat_widgets.ClickableText(commonConst.PRESENCE[presence]))
        #     else:
        #         self.host.status_bar.onPresenceClick()
        # elif command == 'status':
        #     if args:
        #         self.host.status_bar.onChange(user_data=sat_widgets.AdvancedEdit(args[0]))
        #     else:
        #         self.host.status_bar.onStatusClick()
        elif command == 'history':
            widget = self.host.selected_widget
            if isinstance(widget, quick_chat.QuickChat):
                try:
                    limit = int(args[0])
                except (IndexError, ValueError):
                    limit = 50
                widget.updateHistory(size=limit, profile=widget.profile)
        elif command == 'search':
            widget = self.host.selected_widget
            if isinstance(widget, quick_chat.QuickChat):
                pattern = " ".join(args)
                if not pattern:
                    self.host.notif_bar.addMessage(D_("Please specify the globbing pattern to search for"))
                else:
                    widget.updateHistory(size=C.HISTORY_LIMIT_NONE, filters={'search': pattern}, profile=widget.profile)
        elif command == 'filter':
            # FIXME: filter is now only for current widget,
            #        need to be able to set it globally or per widget
            widget = self.host.selected_widget
            # FIXME: Q&D way, need to be more generic
            if isinstance(widget, quick_chat.QuickChat):
                widget.setFilter(args)
        elif command in ('topic', 'suject', 'title'):
            try:
                new_title = args[0].strip()
            except IndexError:
                new_title = None
            widget = self.host.selected_widget
            if isinstance(widget, quick_chat.QuickChat) and widget.type == C.CHAT_GROUP:
                widget.onSubjectDialog(new_title)
        else:
            return
        self.set_edit_text('')

    def _historyCb(self, text):
        self.set_edit_text(text)
        self.set_edit_pos(len(text))

    def keypress(self, size, key):
        """Callback when a key is pressed. Send "composing" states
        and move the index of the temporary history stack."""
        if key == a_key['MODAL_ESCAPE']:
            # first save the text to the current mode, then change to NORMAL
            self.host._updateInputHistory(self.get_edit_text(), mode=self.mode)
            self.host._updateInputHistory(mode=C.MODE_NORMAL)
        if self._mode == C.MODE_NORMAL and key in self._modes:
            self.host._updateInputHistory(mode=self._modes[key][0])
        if key == a_key['HISTORY_PREV']:
            self.host._updateInputHistory(self.get_edit_text(), -1, self._historyCb, self.mode)
            return
        elif key == a_key['HISTORY_NEXT']:
            self.host._updateInputHistory(self.get_edit_text(), +1, self._historyCb, self.mode)
            return
        elif key == a_key['EDIT_ENTER']:
            self.host._updateInputHistory(self.get_edit_text(), mode=self.mode)
        else:
            if (self._mode == C.MODE_INSERTION
                and isinstance(self.host.selected_widget, quick_chat.QuickChat)
                and key not in sat_widgets.FOCUS_KEYS
                and key not in (a_key['HISTORY_PREV'], a_key['HISTORY_NEXT'])
                and self.host.sync):
                self.host.bridge.chatStateComposing(self.host.selected_widget.target, self.host.selected_widget.profile)

        return super(EditBar, self).keypress(size, key)


class PrimitivusTopWidget(sat_widgets.FocusPile):
    """Top most widget used in Primitivus"""
    _focus_inversed = True
    positions = ('menu', 'body', 'notif_bar', 'edit_bar')
    can_hide = ('menu', 'notif_bar')

    def __init__(self, body, menu, notif_bar, edit_bar):
        self._body = body
        self._menu = menu
        self._notif_bar = notif_bar
        self._edit_bar = edit_bar
        self._hidden = {'notif_bar'}
        self._focus_extra = False
        super(PrimitivusTopWidget, self).__init__([('pack', self._menu), self._body, ('pack', self._edit_bar)])
        for position in self.positions:
            setattr(self,
                    position,
                    property(lambda: self, self.widgetGet(position=position),
                             lambda pos, new_wid: self.widgetSet(new_wid, position=pos))
                   )
        self.focus_position = len(self.contents)-1

    def getVisiblePositions(self, keep=None):
        """Return positions that are not hidden in the right order

        @param keep: if not None, this position will be keep in the right order, even if it's hidden
                    (can be useful to find its index)
        @return (list): list of visible positions
        """
        return [pos for pos in self.positions if (keep and pos == keep) or pos not in self._hidden]

    def keypress(self, size, key):
        """Manage FOCUS keys that focus directly a main part (one of self.positions)

        To avoid key conflicts, a combinaison must be made with FOCUS_EXTRA then an other key
        """
        if key == a_key['FOCUS_EXTRA']:
            self._focus_extra = True
            return
        if self._focus_extra:
            self._focus_extra = False
            if key in ('m', '1'):
                focus = 'menu'
            elif key in ('b', '2'):
                focus = 'body'
            elif key in ('n', '3'):
                focus = 'notif_bar'
            elif key in ('e', '4'):
                focus = 'edit_bar'
            else:
                return super(PrimitivusTopWidget, self).keypress(size, key)

            if focus in self._hidden:
                return

            self.focus_position = self.getVisiblePositions().index(focus)
            return

        return super(PrimitivusTopWidget, self).keypress(size, key)

    def widgetGet(self,  position):
        if not position in self.positions:
            raise ValueError("Unknown position {}".format(position))
        return getattr(self, "_{}".format(position))

    def widgetSet(self,  widget, position):
        if not position in self.positions:
            raise ValueError("Unknown position {}".format(position))
        return setattr(self, "_{}".format(position), widget)

    def hideSwitch(self, position):
        if not position in self.can_hide:
            raise ValueError("Can't switch position {}".format(position))
        hide = not position in self._hidden
        widget = self.widgetGet(position)
        idx = self.getVisiblePositions(position).index(position)
        if hide:
            del self.contents[idx]
            self._hidden.add(position)
        else:
            self.contents.insert(idx, (widget, ('pack', None)))
            self._hidden.remove(position)

    def show(self, position):
        if position in self._hidden:
            self.hideSwitch(position)

    def hide(self, position):
        if not position in self._hidden:
            self.hideSwitch(position)


class PrimitivusApp(QuickApp, InputHistory):
    MB_HANDLER = False
    AVATARS_HANDLER = False

    def __init__(self):
        bridge_module = dynamic_import.bridge(bridge_name, 'sat_frontends.bridge')
        if bridge_module is None:
            log.error(u"Can't import {} bridge".format(bridge_name))
            sys.exit(3)
        else:
            log.debug(u"Loading {} bridge".format(bridge_name))
        QuickApp.__init__(self, bridge_factory=bridge_module.Bridge, xmlui=xmlui, check_options=quick_utils.check_options, connect_bridge=False)
        ## main loop setup ##
        event_loop = urwid.GLibEventLoop if 'dbus' in bridge_name else urwid.TwistedEventLoop
        self.loop = urwid.MainLoop(urwid.SolidFill(), C.PALETTE, event_loop=event_loop(), input_filter=self.inputFilter, unhandled_input=self.keyHandler)

    def onBridgeConnected(self):

        ##misc setup##
        self._visible_widgets = set()
        self.notif_bar = sat_widgets.NotificationBar()
        urwid.connect_signal(self.notif_bar, 'change', self.onNotification)

        self.progress_wid = self.widgets.getOrCreateWidget(Progress, None, on_new_widget=None)
        urwid.connect_signal(self.notif_bar.progress, 'click', lambda x: self.selectWidget(self.progress_wid))
        self.__saved_overlay = None

        self.x_notify = Notify()

        # we already manage exit with a_key['APP_QUIT'], so we don't want C-c
        signal.signal(signal.SIGINT, signal.SIG_IGN)
        sat_conf = sat_config.parseMainConf()
        self._bracketed_paste = C.bool(sat_config.getConfig(sat_conf, C.SECTION_NAME, 'bracketed_paste', 'false'))
        if self._bracketed_paste:
            log.debug("setting bracketed paste mode as requested")
            sys.stdout.write("\033[?2004h")
            self._bracketed_mode_set = True

        self.loop.widget = self.main_widget = ProfileManager(self)
        self.postInit()

    @property
    def visible_widgets(self):
        return self._visible_widgets

    @property
    def mode(self):
        return self.editBar.mode

    @mode.setter
    def mode(self, value):
        self.editBar.mode = value

    def modeHint(self, value):
        """Change mode if make sens (i.e.: if there is nothing in the editBar)"""
        if not self.editBar.get_edit_text():
            self.mode = value

    def debug(self):
        """convenient method to reset screen and launch (i)p(u)db"""
        log.info('Entered debug mode')
        try:
            import pudb
            pudb.set_trace()
        except ImportError:
            import os
            os.system('reset')
            try:
                import ipdb
                ipdb.set_trace()
            except ImportError:
                import pdb
                pdb.set_trace()

    def redraw(self):
        """redraw the screen"""
        try:
            self.loop.draw_screen()
        except AttributeError:
            pass

    def start(self):
        self.connectBridge()
        self.loop.run()

    def postInit(self):
        try:
            config.applyConfig(self)
        except Exception as e:
            log.error(u"configuration error: {}".format(e))
            popup = self.alert(_(u"Configuration Error"), _(u"Something went wrong while reading the configuration, please check :messages"))
            if self.options.profile:
                self._early_popup = popup
            else:
                self.showPopUp(popup)
        super(PrimitivusApp, self).postInit(self.main_widget)

    def keysToText(self, keys):
        """Generator return normal text from urwid keys"""
        for k in keys:
            if k == 'tab':
                yield u'\t'
            elif k == 'enter':
                yield u'\n'
            elif is_wide_char(k,0) or (len(k)==1 and ord(k) >= 32):
                yield k

    def inputFilter(self, input_, raw):
        if self.__saved_overlay and input_ != a_key['OVERLAY_HIDE']:
            return

        ## paste detection/handling
        if (len(input_) > 1 and                  # XXX: it may be needed to increase this value if buffer
            not isinstance(input_[0], tuple) and #      or other things result in several chars at once
            not 'window resize' in input_):      #      (e.g. using Primitivus through ssh). Need some testing
                                                 #      and experience to adjust value.
            if input_[0] == 'begin paste' and not self._bracketed_paste:
                log.info(u"Bracketed paste mode detected")
                self._bracketed_paste = True

            if self._bracketed_paste:
                # after this block, extra will contain non pasted keys
                # and input_ will contain pasted keys
                try:
                    begin_idx = input_.index('begin paste')
                except ValueError:
                    # this is not a paste, maybe we have something buffering
                    # or bracketed mode is set in conf but not enabled in term
                    extra = input_
                    input_ = []
                else:
                    try:
                        end_idx = input_.index('end paste')
                    except ValueError:
                        log.warning(u"missing end paste sequence, discarding paste")
                        extra = input_[:begin_idx]
                        del input_[begin_idx:]
                    else:
                        extra = input_[:begin_idx] + input_[end_idx+1:]
                        input_ = input_[begin_idx+1:end_idx]
            else:
                extra = None

            log.debug(u"Paste detected (len {})".format(len(input_)))
            try:
                edit_bar = self.editBar
            except AttributeError:
                log.warning(u"Paste treated as normal text: there is no edit bar yet")
                if extra is None:
                    extra = []
                extra.extend(input_)
            else:
                if self.main_widget.focus == edit_bar:
                    # XXX: if a paste is detected, we append it directly to the edit bar text
                    #      so the user can check it and press [enter] if it's OK
                    buf_paste = u''.join(self.keysToText(input_))
                    pos = edit_bar.edit_pos
                    edit_bar.set_edit_text(u'{}{}{}'.format(edit_bar.edit_text[:pos], buf_paste, edit_bar.edit_text[pos:]))
                    edit_bar.edit_pos+=len(buf_paste)
                else:
                    # we are not on the edit_bar,
                    # so we treat pasted text as normal text
                    if extra is None:
                        extra = []
                    extra.extend(input_)
            if not extra:
                return
            input_ = extra
        ## end of paste detection/handling

        for i in input_:
            if isinstance(i,tuple):
                if i[0] == 'mouse press':
                    if i[1] == 4: #Mouse wheel up
                        input_[input_.index(i)] = a_key['HISTORY_PREV']
                    if i[1] == 5: #Mouse wheel down
                        input_[input_.index(i)] = a_key['HISTORY_NEXT']
        return input_

    def keyHandler(self, input_):
        if input_ == a_key['MENU_HIDE']:
            """User want to (un)hide the menu roller"""
            try:
                self.main_widget.hideSwitch('menu')
            except AttributeError:
                pass
        elif input_ == a_key['NOTIFICATION_NEXT']:
            """User wants to see next notification"""
            self.notif_bar.showNext()
        elif input_ == a_key['OVERLAY_HIDE']:
            """User wants to (un)hide overlay window"""
            if isinstance(self.loop.widget,urwid.Overlay):
                self.__saved_overlay = self.loop.widget
                self.loop.widget = self.main_widget
            else:
                if self.__saved_overlay:
                    self.loop.widget = self.__saved_overlay
                    self.__saved_overlay = None

        elif input_ == a_key['DEBUG'] and 'D' in self.bridge.getVersion(): #Debug only for dev versions
            self.debug()
        elif input_ == a_key['CONTACTS_HIDE']: #user wants to (un)hide the contact lists
            try:
                for wid, options in self.center_part.contents:
                    if self.contact_lists_pile is wid:
                        self.center_part.contents.remove((wid, options))
                        break
                else:
                    self.center_part.contents.insert(0, (self.contact_lists_pile, ('weight', 2, False)))
            except AttributeError:
                #The main widget is not built (probably in Profile Manager)
                pass
        elif input_ == 'window resize':
            width,height = self.loop.screen_size
            if height<=5 and width<=35:
                if not 'save_main_widget' in dir(self):
                    self.save_main_widget = self.loop.widget
                    self.loop.widget = urwid.Filler(urwid.Text(_("Pleeeeasse, I can't even breathe !")))
            else:
                if 'save_main_widget' in dir(self):
                    self.loop.widget = self.save_main_widget
                    del self.save_main_widget
        try:
            return self.menu_roller.checkShortcuts(input_)
        except AttributeError:
            return input_

    def addMenus(self, menu, type_filter, menu_data=None):
        """Add cached menus to instance
        @param menu: sat_widgets.Menu instance
        @param type_filter: menu type like is sat.core.sat_main.importMenu
        @param menu_data: data to send with these menus

        """
        def add_menu_cb(callback_id):
            self.launchAction(callback_id, menu_data, profile=self.current_profile)
        for id_, type_, path, path_i18n, extra  in self.bridge.menusGet("", C.NO_SECURITY_LIMIT ): # TODO: manage extra
            if type_ != type_filter:
                continue
            if len(path) != 2:
                raise NotImplementedError("Menu with a path != 2 are not implemented yet")
            menu.addMenu(path_i18n[0], path_i18n[1], lambda dummy,id_=id_: add_menu_cb(id_))


    def _buildMenuRoller(self):
        menu = sat_widgets.Menu(self.loop)
        general = _("General")
        menu.addMenu(general, _("Connect"), self.onConnectRequest)
        menu.addMenu(general, _("Disconnect"), self.onDisconnectRequest)
        menu.addMenu(general, _("Parameters"), self.onParam)
        menu.addMenu(general, _("About"), self.onAboutRequest)
        menu.addMenu(general, _("Exit"), self.onExitRequest, a_key['APP_QUIT'])
        menu.addMenu(_("Contacts"))  # add empty menu to save the place in the menu order
        groups = _("Groups")
        menu.addMenu(groups)
        menu.addMenu(groups, _("Join room"), self.onJoinRoomRequest, a_key['ROOM_JOIN'])
        #additionals menus
        #FIXME: do this in a more generic way (in quickapp)
        self.addMenus(menu, C.MENU_GLOBAL)

        menu_roller = sat_widgets.MenuRoller([(_('Main menu'), menu, C.MENU_ID_MAIN)])
        return menu_roller

    def _buildMainWidget(self):
        self.contact_lists_pile = urwid.Pile([])
        #self.center_part = urwid.Columns([('weight',2,self.contact_lists[profile]),('weight',8,Chat('',self))])
        self.center_part = urwid.Columns([('weight', 2, self.contact_lists_pile), ('weight', 8, urwid.Filler(urwid.Text('')))])

        self.editBar = EditBar(self)
        self.menu_roller = self._buildMenuRoller()
        self.main_widget = PrimitivusTopWidget(self.center_part, self.menu_roller, self.notif_bar, self.editBar)
        return self.main_widget

    def plugging_profiles(self):
        self.loop.widget = self._buildMainWidget()
        self.redraw()
        try:
            # if a popup arrived before main widget is build, we need to show it now
            self.showPopUp(self._early_popup)
        except AttributeError:
            pass
        else:
            del self._early_popup

    def profilePlugged(self, profile):
        QuickApp.profilePlugged(self, profile)
        contact_list = self.widgets.getOrCreateWidget(ContactList, None, on_new_widget=None, on_click=self.contactSelected, on_change=lambda w: self.redraw(), profile=profile)
        self.contact_lists_pile.contents.append((contact_list, ('weight', 1)))
        return contact_list

    def isHidden(self):
        """Tells if the frontend window is hidden.

        @return bool
        """
        return False  # FIXME: implement when necessary

    def alert(self, title, message):
        """Shortcut method to create an alert message

        Alert will have an "OK" button, which remove it if pressed
        @param title(unicode): title of the dialog
        @param message(unicode): body of the dialog
        @return (urwid_satext.Alert): the created Alert instance
        """
        popup = sat_widgets.Alert(title, message)
        popup.setCallback('ok', lambda dummy: self.removePopUp(popup))
        self.showPopUp(popup, width=75, height=20)
        return popup

    def removePopUp(self, widget=None):
        """Remove current pop-up, and if there is other in queue, show it

        @param widget(None, urwid.Widget): if not None remove this popup from front or queue
        """
        # TODO: refactor popup management in a cleaner way
        # buttons' callback use themselve as first argument, and we never use
        # a Button directly in a popup, so we consider urwid.Button as None
        if widget is not None and not isinstance(widget, urwid.Button):
            if isinstance(self.loop.widget, urwid.Overlay):
                current_popup = self.loop.widget.top_w
                if not current_popup == widget:
                    try:
                        self.notif_bar.removePopUp(widget)
                    except ValueError:
                        log.warning(u"Trying to remove an unknown widget {}".format(widget))
                    return
        self.loop.widget = self.main_widget
        next_popup = self.notif_bar.getNextPopup()
        if next_popup:
            #we still have popup to show, we display it
            self.showPopUp(next_popup)
        else:
            self.redraw()

    def showPopUp(self, pop_up_widget, width=None, height=None, align='center',
                  valign='middle'):
        """Show a pop-up window if possible, else put it in queue

        @param pop_up_widget: pop up to show
        @param width(int, None): width of the popup
            None to use default
        @param height(int, None): height of the popup
            None to use default
        @param align: same as for [urwid.Overlay]
        """
        if width == None:
            width = 75 if isinstance(pop_up_widget, xmlui.PrimitivusNoteDialog) else 135
        if height == None:
            height = 20 if isinstance(pop_up_widget, xmlui.PrimitivusNoteDialog) else 40
        if not isinstance(self.loop.widget, urwid.Overlay):
            display_widget = urwid.Overlay(
                pop_up_widget, self.main_widget, align, width, valign, height)
            self.loop.widget = display_widget
            self.redraw()
        else:
            self.notif_bar.addPopUp(pop_up_widget)

    def barNotify(self, message):
        """"Notify message to user via notification bar"""
        self.notif_bar.addMessage(message)
        self.redraw()

    def notify(self, type_, entity=None, message=None, subject=None, callback=None, cb_args=None, widget=None, profile=C.PROF_KEY_NONE):
        if widget is None or widget is not None and widget != self.selected_widget:
            # we ignore notification if the widget is selected but we can
            # still do a desktop notification is the X window has not the focus
            super(PrimitivusApp, self).notify(type_, entity, message, subject, callback, cb_args, widget, profile)
        # we don't want notifications without message on desktop
        if message is not None and not self.x_notify.hasFocus():
            if message is None:
                message = _("{app}: a new event has just happened{entity}").format(
                    app=C.APP_NAME,
                    entity=u' ({})'.format(entity) if entity else '')
            self.x_notify.sendNotification(message)


    def newWidget(self, widget, user_action=False):
        """Method called when a new widget is created

        if suitable, the widget will be displayed
        @param widget(widget.PrimitivusWidget): created widget
        @param user_action(bool): if True, the widget has been created following an
            explicit user action. In this case, the widget may get focus immediately
        """
        # FIXME: when several widgets are possible (e.g. with :split)
        #        do not replace current widget when self.selected_widget != None
        if user_action or self.selected_widget is None:
            self.selectWidget(widget)

    def selectWidget(self, widget):
        """Display a widget if possible,

        else add it in the notification bar queue
        @param widget: BoxWidget
        """
        assert len(self.center_part.widget_list)<=2
        wid_idx = len(self.center_part.widget_list)-1
        self.center_part.widget_list[wid_idx] = widget
        try:
            self.menu_roller.removeMenu(C.MENU_ID_WIDGET)
        except KeyError:
            log.debug("No menu to delete")
        self.selected_widget = widget
        try:
            onSelected = self.selected_widget.onSelected
        except AttributeError:
            pass
        else:
            onSelected()
        self._visible_widgets = set([widget]) # XXX: we can only have one widget visible at the time for now
        self.contact_lists.select(None)

        for wid in self.visible_widgets: # FIXME: check if widgets.getWidgets is not more appropriate
            if isinstance(wid, Chat):
                contact_list = self.contact_lists[wid.profile]
                contact_list.select(wid.target)

        self.redraw()

    def removeWindow(self):
        """Remove window showed on the right column"""
        #TODO: better Window management than this hack
        assert len(self.center_part.widget_list) <= 2
        wid_idx = len(self.center_part.widget_list)-1
        self.center_part.widget_list[wid_idx] = urwid.Filler(urwid.Text(''))
        self.center_part.focus_position = 0
        self.redraw()

    def addProgress(self, pid, message, profile):
        """Follow a SàT progression

        @param pid: progression id
        @param message: message to show to identify the progression
        """
        self.progress_wid.add(pid, message, profile)

    def setProgress(self, percentage):
        """Set the progression shown in notification bar"""
        self.notif_bar.setProgress(percentage)

    def contactSelected(self, contact_list, entity):
        self.clearNotifs(entity, profile=contact_list.profile)
        if entity.resource:
            # we have clicked on a private MUC conversation
            chat_widget = self.widgets.getOrCreateWidget(Chat, entity, on_new_widget=None, force_hash = Chat.getPrivateHash(contact_list.profile, entity), profile=contact_list.profile)
        else:
            chat_widget = self.widgets.getOrCreateWidget(Chat, entity, on_new_widget=None, profile=contact_list.profile)
        self.selectWidget(chat_widget)
        self.menu_roller.addMenu(_('Chat menu'), chat_widget.getMenu(), C.MENU_ID_WIDGET)

    def _dialogOkCb(self, widget, data):
        popup, answer_cb, answer_data = data
        self.removePopUp(popup)
        if answer_cb is not None:
            answer_cb(True, answer_data)

    def _dialogCancelCb(self, widget, data):
        popup, answer_cb, answer_data = data
        self.removePopUp(popup)
        if answer_cb is not None:
            answer_cb(False, answer_data)

    def showDialog(self, message, title="", type="info", answer_cb = None, answer_data = None):
        if type == 'info':
            popup = sat_widgets.Alert(title, message, ok_cb=answer_cb)
            if answer_cb is None:
                popup.setCallback('ok', lambda dummy: self.removePopUp(popup))
        elif type == 'error':
            popup = sat_widgets.Alert(title, message, ok_cb=answer_cb)
            if answer_cb is None:
                popup.setCallback('ok', lambda dummy: self.removePopUp(popup))
        elif type == 'yes/no':
            popup = sat_widgets.ConfirmDialog(message)
            popup.setCallback('yes', self._dialogOkCb, (popup, answer_cb, answer_data))
            popup.setCallback('no', self._dialogCancelCb, (popup, answer_cb, answer_data))
        else:
            popup = sat_widgets.Alert(title, message, ok_cb=answer_cb)
            if answer_cb is None:
                popup.setCallback('ok', lambda dummy: self.removePopUp(popup))
            log.error(u'unmanaged dialog type: {}'.format(type))
        self.showPopUp(popup)

    def dialogFailure(self, failure):
        """Show a failure that has been returned by an asynchronous bridge method.

        @param failure (defer.Failure): Failure instance
        """
        self.alert(failure.classname, failure.message)

    def onNotification(self, notif_bar):
        """Called when a new notification has been received"""
        if not isinstance(self.main_widget, PrimitivusTopWidget):
            #if we are not in the main configuration, we ignore the notifications bar
            return
        if self.notif_bar.canHide():
                #No notification left, we can hide the bar
                self.main_widget.hide('notif_bar')
        else:
            self.main_widget.show('notif_bar')
            self.redraw() # FIXME: invalidate cache in a more efficient way

    def _actionManagerUnknownError(self):
        self.alert(_("Error"), _(u"Unmanaged action"))

    def roomJoinedHandler(self, room_jid_s, room_nicks, user_nick, subject, profile):
        super(PrimitivusApp, self).roomJoinedHandler(room_jid_s, room_nicks, user_nick, subject, profile)
        # if self.selected_widget is None:
        #     for contact_list in self.widgets.getWidgets(ContactList):
        #         if profile in contact_list.profiles:
        #             contact_list.setFocus(jid.JID(room_jid_s), True)

    def progressStartedHandler(self, pid, metadata, profile):
        super(PrimitivusApp, self).progressStartedHandler(pid, metadata, profile)
        self.addProgress(pid, metadata.get('name', _(u'unkown')), profile)

    def progressFinishedHandler(self, pid, metadata, profile):
        log.info(u"Progress {} finished".format(pid))
        super(PrimitivusApp, self).progressFinishedHandler(pid, metadata, profile)

    def progressErrorHandler(self, pid, err_msg, profile):
        log.warning(u"Progress {pid} error: {err_msg}".format(pid=pid, err_msg=err_msg))
        super(PrimitivusApp, self).progressErrorHandler(pid, err_msg, profile)


    ##DIALOGS CALLBACKS##
    def onJoinRoom(self, button, edit):
        self.removePopUp()
        room_jid = jid.JID(edit.get_edit_text())
        self.bridge.mucJoin(room_jid, self.profiles[self.current_profile].whoami.node, {}, self.current_profile, callback=lambda dummy: None, errback=self.dialogFailure)

    #MENU EVENTS#
    def onConnectRequest(self, menu):
        QuickApp.connect(self, self.current_profile)

    def onDisconnectRequest(self, menu):
        self.disconnect(self.current_profile)

    def onParam(self, menu):
        def success(params):
            ui = xmlui.create(self, xml_data=params, profile=self.current_profile)
            ui.show()

        def failure(error):
            self.alert(_("Error"), _("Can't get parameters (%s)") % error)
        self.bridge.getParamsUI(app=C.APP_NAME, profile_key=self.current_profile, callback=success, errback=failure)

    def onExitRequest(self, menu):
        QuickApp.onExit(self)
        try:
            if self._bracketed_mode_set: # we don't unset if bracketed paste mode was detected automatically (i.e. not in conf)
                log.debug("unsetting bracketed paste mode")
                sys.stdout.write("\033[?2004l")
        except AttributeError:
            pass
        raise urwid.ExitMainLoop()

    def onJoinRoomRequest(self, menu):
        """User wants to join a MUC room"""
        pop_up_widget = sat_widgets.InputDialog(_("Entering a MUC room"), _("Please enter MUC's JID"), default_txt=self.bridge.mucGetDefaultService(), ok_cb=self.onJoinRoom)
        pop_up_widget.setCallback('cancel', lambda dummy: self.removePopUp(pop_up_widget))
        self.showPopUp(pop_up_widget)

    def onAboutRequest(self, menu):
        self.alert(_("About"), C.APP_NAME + " v" + self.bridge.getVersion())

    #MISC CALLBACKS#

    def setPresenceStatus(self, show='', status=None, profile=C.PROF_KEY_NONE):
        contact_list_wid = self.widgets.getWidget(ContactList, profiles=profile)
        if contact_list_wid is not None:
            contact_list_wid.status_bar.setPresenceStatus(show, status)
        else:
            log.warning(u"No ContactList widget found for profile {}".format(profile))

primitivus = PrimitivusApp()
primitivus.start()