--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libervia/backend/plugins/plugin_misc_room_game.py	Fri Jun 02 11:49:51 2023 +0200
@@ -0,0 +1,784 @@
+#!/usr/bin/env python3
+
+
+# SAT: a jabber client
+# Copyright (C) 2009-2021 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 libervia.backend.core.i18n import _
+from libervia.backend.core.constants import Const as C
+from libervia.backend.core.log import getLogger
+
+log = getLogger(__name__)
+from twisted.words.protocols.jabber import jid
+from twisted.words.xish import domish
+from twisted.internet import defer
+from time import time
+from wokkel import disco, iwokkel
+from zope.interface import implementer
+import copy
+
+try:
+    from twisted.words.protocols.xmlstream import XMPPHandler
+except ImportError:
+    from wokkel.subprotocols import XMPPHandler
+
+# Don't forget to set it to False before you commit
+_DEBUG = False
+
+PLUGIN_INFO = {
+    C.PI_NAME: "Room game",
+    C.PI_IMPORT_NAME: "ROOM-GAME",
+    C.PI_TYPE: "MISC",
+    C.PI_PROTOCOLS: [],
+    C.PI_DEPENDENCIES: ["XEP-0045", "XEP-0249"],
+    C.PI_MAIN: "RoomGame",
+    C.PI_HANDLER: "no",  # handler MUST be "no" (dynamic inheritance)
+    C.PI_DESCRIPTION: _("""Base class for MUC games"""),
+}
+
+
+# FIXME: this plugin is broken, need to be fixed
+
+
+class RoomGame(object):
+    """This class is used to help launching a MUC game.
+
+    bridge methods callbacks: _prepare_room, _player_ready, _create_game
+    Triggered methods: user_joined_trigger, user_left_trigger
+    Also called from subclasses: new_round
+
+    For examples of messages sequences, please look in sub-classes.
+    """
+
+    # Values for self.invite_mode (who can invite after the game creation)
+    FROM_ALL, FROM_NONE, FROM_REFEREE, FROM_PLAYERS = range(0, 4)
+    # Values for self.wait_mode (for who we should wait before creating the game)
+    FOR_ALL, FOR_NONE = range(0, 2)
+    # Values for self.join_mode (who can join the game - NONE means solo game)
+    ALL, INVITED, NONE = range(0, 3)
+    # Values for ready_mode (how to turn a MUC user into a player)
+    ASK, FORCE = range(0, 2)
+
+    MESSAGE = "/message"
+    REQUEST = '%s/%s[@xmlns="%s"]'
+
+    def __init__(self, host):
+        """For other plugin to dynamically inherit this class, it is necessary to not use __init__ but _init_.
+        The subclass itself must be initialized this way:
+
+        class MyGame(object):
+
+            def inherit_from_room_game(self, host):
+                global RoomGame
+                RoomGame = host.plugins["ROOM-GAME"].__class__
+                self.__class__ = type(self.__class__.__name__, (self.__class__, RoomGame, object), {})
+
+            def __init__(self, host):
+                self.inherit_from_room_game(host)
+                RoomGame._init_(self, host, ...)
+
+        """
+        self.host = host
+
+    def _init_(self, host, plugin_info, ns_tag, game_init=None, player_init=None):
+        """
+        @param host
+        @param plugin_info: PLUGIN_INFO map of the game plugin
+        @param ns_tag: couple (nameservice, tag) to construct the messages
+        @param game_init: dictionary for general game initialization
+        @param player_init: dictionary for player initialization, applicable to each player
+        """
+        self.host = host
+        self.name = plugin_info["import_name"]
+        self.ns_tag = ns_tag
+        self.request = self.REQUEST % (self.MESSAGE, ns_tag[1], ns_tag[0])
+        if game_init is None:
+            game_init = {}
+        if player_init is None:
+            player_init = {}
+        self.game_init = game_init
+        self.player_init = player_init
+        self.games = {}
+        self.invitations = {}  # values are a couple (x, y) with x the time and y a list of users
+
+        # These are the default settings, which can be overwritten by child class after initialization
+        self.invite_mode = self.FROM_PLAYERS if self.player_init == {} else self.FROM_NONE
+        self.wait_mode = self.FOR_NONE if self.player_init == {} else self.FOR_ALL
+        self.join_mode = self.INVITED
+        self.ready_mode = self.FORCE  # TODO: asking for confirmation is not implemented
+
+        # this has been added for testing purpose. It is sometimes needed to remove a dependence
+        # while building the synchronization data, for example to replace a call to time.time()
+        # by an arbitrary value. If needed, this attribute would be set to True from the testcase.
+        self.testing = False
+
+        host.trigger.add("MUC user joined", self.user_joined_trigger)
+        host.trigger.add("MUC user left", self.user_left_trigger)
+
+    def _create_or_invite(self, room_jid, other_players, profile):
+        """
+        This is called only when someone explicitly wants to play.
+
+        The game will not be created if one already exists in the room,
+        also its creation could be postponed until all the expected players
+        join the room (in that case it will be created from user_joined_trigger).
+        @param room (wokkel.muc.Room): the room
+        @param other_players (list[jid.JID]): list of the other players JID (bare)
+        """
+        # FIXME: broken !
+        raise NotImplementedError("To be fixed")
+        client = self.host.get_client(profile)
+        user_jid = self.host.get_jid_n_stream(profile)[0]
+        nick = self.host.plugins["XEP-0045"].get_room_nick(client, room_jid)
+        nicks = [nick]
+        if self._game_exists(room_jid):
+            if not self._check_join_auth(room_jid, user_jid, nick):
+                return
+            nicks.extend(self._invite_players(room_jid, other_players, nick, profile))
+            self._update_players(room_jid, nicks, True, profile)
+        else:
+            self._init_game(room_jid, nick)
+            (auth, waiting, missing) = self._check_wait_auth(room_jid, other_players)
+            nicks.extend(waiting)
+            nicks.extend(self._invite_players(room_jid, missing, nick, profile))
+            if auth:
+                self.create_game(room_jid, nicks, profile)
+            else:
+                self._update_players(room_jid, nicks, False, profile)
+
+    def _init_game(self, room_jid, referee_nick):
+        """
+
+        @param room_jid (jid.JID): JID of the room
+        @param referee_nick (unicode): nickname of the referee
+        """
+        # Important: do not add the referee to 'players' yet. For a
+        # <players /> message to be emitted whenever a new player is joining,
+        # it is necessary to not modify 'players' outside of _update_players.
+        referee_jid = jid.JID(room_jid.userhost() + "/" + referee_nick)
+        self.games[room_jid] = {
+            "referee": referee_jid,
+            "players": [],
+            "started": False,
+            "status": {},
+        }
+        self.games[room_jid].update(copy.deepcopy(self.game_init))
+        self.invitations.setdefault(room_jid, [])
+
+    def _game_exists(self, room_jid, started=False):
+        """Return True if a game has been initialized/started.
+        @param started: if False, the game must be initialized to return True,
+        otherwise it must be initialized and started with create_game.
+        @return: True if a game is initialized/started in that room"""
+        return room_jid in self.games and (not started or self.games[room_jid]["started"])
+
+    def _check_join_auth(self, room_jid, user_jid=None, nick="", verbose=False):
+        """Checks if this profile is allowed to join the game.
+
+        The parameter nick is used to check if the user is already
+        a player in that game. When this method is called from
+        user_joined_trigger, nick is also used to check the user
+        identity instead of user_jid_s (see TODO comment below).
+        @param room_jid (jid.JID): the JID of the room hosting the game
+        @param user_jid (jid.JID): JID of the user
+        @param nick (unicode): nick of the user
+        @return: True if this profile can join the game
+        """
+        auth = False
+        if not self._game_exists(room_jid):
+            auth = False
+        elif self.join_mode == self.ALL or self.is_player(room_jid, nick):
+            auth = True
+        elif self.join_mode == self.INVITED:
+            # considering all the batches of invitations
+            for invitations in self.invitations[room_jid]:
+                if user_jid is not None:
+                    if user_jid.userhostJID() in invitations[1]:
+                        auth = True
+                        break
+                else:
+                    # TODO: that's not secure enough but what to do if
+                    # wokkel.muc.User's 'entity' attribute is not set?!
+                    if nick in [invited.user for invited in invitations[1]]:
+                        auth = True
+                        break
+
+        if not auth and (verbose or _DEBUG):
+            log.debug(
+                _("%(user)s not allowed to join the game %(game)s in %(room)s")
+                % {
+                    "user": user_jid.userhost() or nick,
+                    "game": self.name,
+                    "room": room_jid.userhost(),
+                }
+            )
+        return auth
+
+    def _update_players(self, room_jid, nicks, sync, profile):
+        """Update the list of players and signal to the room that some players joined the game.
+        If sync is True, the news players are synchronized with the game data they have missed.
+        Remark: self.games[room_jid]['players'] should not be modified outside this method.
+        @param room_jid (jid.JID): JID of the room
+        @param nicks (list[unicode]): list of players nicks in the room (referee included, in first position)
+        @param sync (bool): set to True to send synchronization data to the new players
+        @param profile (unicode): %(doc_profile)s
+        """
+        if nicks == []:
+            return
+        # this is better than set(nicks).difference(...) as it keeps the order
+        new_nicks = [
+            nick for nick in nicks if nick not in self.games[room_jid]["players"]
+        ]
+        if len(new_nicks) == 0:
+            return
+
+        def setStatus(status):
+            for nick in new_nicks:
+                self.games[room_jid]["status"][nick] = status
+
+        sync = (
+            sync
+            and self._game_exists(room_jid, True)
+            and len(self.games[room_jid]["players"]) > 0
+        )
+        setStatus("desync" if sync else "init")
+        self.games[room_jid]["players"].extend(new_nicks)
+        self._synchronize_room(room_jid, [room_jid], profile)
+        if sync:
+            setStatus("init")
+
+    def _synchronize_room(self, room_jid, recipients, profile):
+        """Communicate the list of players to the whole room or only to some users,
+        also send the synchronization data to the players who recently joined the game.
+        @param room_jid (jid.JID): JID of the room
+        @recipients (list[jid.JID]): list of JIDs, the recipients of the message could be:
+            - room JID
+            - room JID + "/" + user nick
+        @param profile (unicode): %(doc_profile)s
+        """
+        if self._game_exists(room_jid, started=True):
+            element = self._create_start_element(self.games[room_jid]["players"])
+        else:
+            element = self._create_start_element(
+                self.games[room_jid]["players"], name="players"
+            )
+        elements = [(element, None, None)]
+
+        sync_args = []
+        sync_data = self._get_sync_data(room_jid)
+        for nick in sync_data:
+            user_jid = jid.JID(room_jid.userhost() + "/" + nick)
+            if user_jid in recipients:
+                user_elements = copy.deepcopy(elements)
+                for child in sync_data[nick]:
+                    user_elements.append((child, None, None))
+                recipients.remove(user_jid)
+            else:
+                user_elements = [(child, None, None) for child in sync_data[nick]]
+            sync_args.append(([user_jid, user_elements], {"profile": profile}))
+
+        for recipient in recipients:
+            self._send_elements(recipient, elements, profile=profile)
+        for args, kwargs in sync_args:
+            self._send_elements(*args, **kwargs)
+
+    def _get_sync_data(self, room_jid, force_nicks=None):
+        """The synchronization data are returned for each player who
+        has the state 'desync' or if he's been contained by force_nicks.
+        @param room_jid (jid.JID): JID of the room
+        @param force_nicks: force the synchronization for this list of the nicks
+        @return: a mapping between player nicks and a list of elements to
+        be sent by self._synchronize_room for the game to be synchronized.
+        """
+        if not self._game_exists(room_jid):
+            return {}
+        data = {}
+        status = self.games[room_jid]["status"]
+        nicks = [nick for nick in status if status[nick] == "desync"]
+        if force_nicks is None:
+            force_nicks = []
+        for nick in force_nicks:
+            if nick not in nicks:
+                nicks.append(nick)
+        for nick in nicks:
+            elements = self.get_sync_data_for_player(room_jid, nick)
+            if elements:
+                data[nick] = elements
+        return data
+
+    def get_sync_data_for_player(self, room_jid, nick):
+        """This method may (and should probably) be overwritten by a child class.
+        @param room_jid (jid.JID): JID of the room
+        @param nick: the nick of the player to be synchronized
+        @return: a list of elements to synchronize this player with the game.
+        """
+        return []
+
+    def _invite_players(self, room_jid, other_players, nick, profile):
+        """Invite players to a room, associated game may exist or not.
+
+        @param other_players (list[jid.JID]): list of the players to invite
+        @param nick (unicode): nick of the user who send the invitation
+        @return: list[unicode] of room nicks for invited players who are already in the room
+        """
+        raise NotImplementedError("Need to be fixed !")
+        # FIXME: this is broken and unsecure !
+        if not self._check_invite_auth(room_jid, nick):
+            return []
+        # TODO: remove invitation waiting for too long, using the time data
+        self.invitations[room_jid].append(
+            (time(), [player.userhostJID() for player in other_players])
+        )
+        nicks = []
+        for player_jid in [player.userhostJID() for player in other_players]:
+            # TODO: find a way to make it secure
+            other_nick = self.host.plugins["XEP-0045"].getRoomEntityNick(
+                room_jid, player_jid, secure=self.testing
+            )
+            if other_nick is None:
+                self.host.plugins["XEP-0249"].invite(
+                    player_jid, room_jid, {"game": self.name}, profile
+                )
+            else:
+                nicks.append(other_nick)
+        return nicks
+
+    def _check_invite_auth(self, room_jid, nick, verbose=False):
+        """Checks if this user is allowed to invite players
+
+        @param room_jid (jid.JID): JID of the room
+        @param nick: user nick in the room
+        @param verbose: display debug message
+        @return: True if the user is allowed to invite other players
+        """
+        auth = False
+        if self.invite_mode == self.FROM_ALL or not self._game_exists(room_jid):
+            auth = True
+        elif self.invite_mode == self.FROM_NONE:
+            auth = not self._game_exists(room_jid, started=True) and self.is_referee(
+                room_jid, nick
+            )
+        elif self.invite_mode == self.FROM_REFEREE:
+            auth = self.is_referee(room_jid, nick)
+        elif self.invite_mode == self.FROM_PLAYERS:
+            auth = self.is_player(room_jid, nick)
+        if not auth and (verbose or _DEBUG):
+            log.debug(
+                _("%(user)s not allowed to invite for the game %(game)s in %(room)s")
+                % {"user": nick, "game": self.name, "room": room_jid.userhost()}
+            )
+        return auth
+
+    def is_referee(self, room_jid, nick):
+        """Checks if the player with this nick is the referee for the game in this room"
+        @param room_jid (jid.JID): room JID
+        @param nick: user nick in the room
+        @return: True if the user is the referee of the game in this room
+        """
+        if not self._game_exists(room_jid):
+            return False
+        return (
+            jid.JID(room_jid.userhost() + "/" + nick) == self.games[room_jid]["referee"]
+        )
+
+    def is_player(self, room_jid, nick):
+        """Checks if the user with this nick is a player for the game in this room.
+        @param room_jid (jid.JID): JID of the room
+        @param nick: user nick in the room
+        @return: True if the user is a player of the game in this room
+        """
+        if not self._game_exists(room_jid):
+            return False
+        # Important: the referee is not in the 'players' list right after
+        # the game initialization, that's why we do also check with is_referee
+        return nick in self.games[room_jid]["players"] or self.is_referee(room_jid, nick)
+
+    def _check_wait_auth(self, room, other_players, verbose=False):
+        """Check if we must wait for other players before starting the game.
+
+        @param room (wokkel.muc.Room): the room
+        @param other_players (list[jid.JID]): list of the players without the referee
+        @param verbose (bool): display debug message
+        @return: (x, y, z) with:
+            x: False if we must wait, True otherwise
+            y: the nicks of the players that have been checked and confirmed
+            z: the JID of the players that have not been checked or that are missing
+        """
+        if self.wait_mode == self.FOR_NONE or other_players == []:
+            result = (True, [], other_players)
+        elif len(room.roster) < len(other_players):
+            # do not check the players until we may actually have them all
+            result = (False, [], other_players)
+        else:
+            # TODO: find a way to make it secure
+            (nicks, missing) = self.host.plugins["XEP-0045"].getRoomNicksOfUsers(
+                room, other_players, secure=False
+            )
+            result = (len(nicks) == len(other_players), nicks, missing)
+        if not result[0] and (verbose or _DEBUG):
+            log.debug(
+                _(
+                    "Still waiting for %(users)s before starting the game %(game)s in %(room)s"
+                )
+                % {
+                    "users": result[2],
+                    "game": self.name,
+                    "room": room.occupantJID.userhost(),
+                }
+            )
+        return result
+
+    def get_unique_name(self, muc_service=None, profile_key=C.PROF_KEY_NONE):
+        """Generate unique room name
+
+        @param muc_service (jid.JID): you can leave empty to autofind the muc service
+        @param profile_key (unicode): %(doc_profile_key)s
+        @return: jid.JID (unique name for a new room to be created)
+        """
+        client = self.host.get_client(profile_key)
+        # FIXME: jid.JID must be used instead of strings
+        room = self.host.plugins["XEP-0045"].get_unique_name(client, muc_service)
+        return jid.JID("sat_%s_%s" % (self.name.lower(), room.userhost()))
+
+    def _prepare_room(
+        self, other_players=None, room_jid_s="", profile_key=C.PROF_KEY_NONE
+    ):
+        room_jid = jid.JID(room_jid_s) if room_jid_s else None
+        other_players = [jid.JID(player).userhostJID() for player in other_players]
+        return self.prepare_room(other_players, room_jid, profile_key)
+
+    def prepare_room(self, other_players=None, room_jid=None, profile_key=C.PROF_KEY_NONE):
+        """Prepare the room for a game: create it if it doesn't exist and invite players.
+
+        @param other_players (list[JID]): list of other players JID (bare)
+        @param room_jid (jid.JID): JID of the room, or None to generate a unique name
+        @param profile_key (unicode): %(doc_profile_key)s
+        """
+        # FIXME: need to be refactored
+        client = self.host.get_client(profile_key)
+        log.debug(_("Preparing room for %s game") % self.name)
+        profile = self.host.memory.get_profile_name(profile_key)
+        if not profile:
+            log.error(_("Unknown profile"))
+            return defer.succeed(None)
+        if other_players is None:
+            other_players = []
+
+        # Create/join the given room, or a unique generated one if no room is specified.
+        if room_jid is None:
+            room_jid = self.get_unique_name(profile_key=profile_key)
+        else:
+            self.host.plugins["XEP-0045"].check_room_joined(client, room_jid)
+            self._create_or_invite(client, room_jid, other_players)
+            return defer.succeed(None)
+
+        user_jid = self.host.get_jid_n_stream(profile)[0]
+        d = self.host.plugins["XEP-0045"].join(room_jid, user_jid.user, {}, profile)
+        return d.addCallback(
+            lambda __: self._create_or_invite(client, room_jid, other_players)
+        )
+
+    def user_joined_trigger(self, room, user, profile):
+        """This trigger is used to check if the new user can take part of a game, create the game if we were waiting for him or just update the players list.
+
+        @room: wokkel.muc.Room object. room.roster is a dict{wokkel.muc.User.nick: wokkel.muc.User}
+        @user: wokkel.muc.User object. user.nick is a unicode and user.entity a JID
+        @return: True to not interrupt the main process.
+        """
+        room_jid = room.occupantJID.userhostJID()
+        profile_nick = room.occupantJID.resource
+        if not self.is_referee(room_jid, profile_nick):
+            return True  # profile is not the referee
+        if not self._check_join_auth(
+            room_jid, user.entity if user.entity else None, user.nick
+        ):
+            # user not allowed but let him know that we are playing :p
+            self._synchronize_room(
+                room_jid, [jid.JID(room_jid.userhost() + "/" + user.nick)], profile
+            )
+            return True
+        if self.wait_mode == self.FOR_ALL:
+            # considering the last batch of invitations
+            batch = len(self.invitations[room_jid]) - 1
+            if batch < 0:
+                log.error(
+                    "Invitations from %s to play %s in %s have been lost!"
+                    % (profile_nick, self.name, room_jid.userhost())
+                )
+                return True
+            other_players = self.invitations[room_jid][batch][1]
+            (auth, nicks, __) = self._check_wait_auth(room, other_players)
+            if auth:
+                del self.invitations[room_jid][batch]
+                nicks.insert(0, profile_nick)  # add the referee
+                self.create_game(room_jid, nicks, profile_key=profile)
+                return True
+        # let the room know that a new player joined
+        self._update_players(room_jid, [user.nick], True, profile)
+        return True
+
+    def user_left_trigger(self, room, user, profile):
+        """This trigger is used to update or stop the game when a user leaves.
+
+        @room: wokkel.muc.Room object. room.roster is a dict{wokkel.muc.User.nick: wokkel.muc.User}
+        @user: wokkel.muc.User object. user.nick is a unicode and user.entity a JID
+        @return: True to not interrupt the main process.
+        """
+        room_jid = room.occupantJID.userhostJID()
+        profile_nick = room.occupantJID.resource
+        if not self.is_referee(room_jid, profile_nick):
+            return True  # profile is not the referee
+        if self.is_player(room_jid, user.nick):
+            try:
+                self.games[room_jid]["players"].remove(user.nick)
+            except ValueError:
+                pass
+            if len(self.games[room_jid]["players"]) == 0:
+                return True
+            if self.wait_mode == self.FOR_ALL:
+                # allow this user to join the game again
+                user_jid = user.entity.userhostJID()
+                if len(self.invitations[room_jid]) == 0:
+                    self.invitations[room_jid].append((time(), [user_jid]))
+                else:
+                    batch = 0  # add to the first batch of invitations
+                    if user_jid not in self.invitations[room_jid][batch][1]:
+                        self.invitations[room_jid][batch][1].append(user_jid)
+        return True
+
+    def _check_create_game_and_init(self, room_jid, profile):
+        """Check if that profile can create the game. If the game can be created
+        but is not initialized yet, this method will also do the initialization.
+
+        @param room_jid (jid.JID): JID of the room
+        @param profile
+        @return: a couple (create, sync) with:
+                - create: set to True to allow the game creation
+                - sync: set to True to advice a game synchronization
+        """
+        user_nick = self.host.plugins["XEP-0045"].get_room_nick(room_jid, profile)
+        if not user_nick:
+            log.error(
+                "Internal error: profile %s has not joined the room %s"
+                % (profile, room_jid.userhost())
+            )
+            return False, False
+        if self._game_exists(room_jid):
+            is_referee = self.is_referee(room_jid, user_nick)
+            if self._game_exists(room_jid, started=True):
+                log.info(
+                    _("%(game)s game already created in room %(room)s")
+                    % {"game": self.name, "room": room_jid.userhost()}
+                )
+                return False, is_referee
+            elif not is_referee:
+                log.info(
+                    _("%(game)s game in room %(room)s can only be created by %(user)s")
+                    % {"game": self.name, "room": room_jid.userhost(), "user": user_nick}
+                )
+                return False, False
+        else:
+            self._init_game(room_jid, user_nick)
+        return True, False
+
+    def _create_game(self, room_jid_s, nicks=None, profile_key=C.PROF_KEY_NONE):
+        self.create_game(jid.JID(room_jid_s), nicks, profile_key)
+
+    def create_game(self, room_jid, nicks=None, profile_key=C.PROF_KEY_NONE):
+        """Create a new game.
+
+        This can be called directly from a frontend and skips all the checks and invitation system,
+        but the game must not exist and all the players must be in the room already.
+        @param room_jid (jid.JID): JID of the room
+        @param nicks (list[unicode]): list of players nicks in the room (referee included, in first position)
+        @param profile_key (unicode): %(doc_profile_key)s
+        """
+        log.debug(
+            _("Creating %(game)s game in room %(room)s")
+            % {"game": self.name, "room": room_jid}
+        )
+        profile = self.host.memory.get_profile_name(profile_key)
+        if not profile:
+            log.error(_("profile %s is unknown") % profile_key)
+            return
+        (create, sync) = self._check_create_game_and_init(room_jid, profile)
+        if nicks is None:
+            nicks = []
+        if not create:
+            if sync:
+                self._update_players(room_jid, nicks, True, profile)
+            return
+        self.games[room_jid]["started"] = True
+        self._update_players(room_jid, nicks, False, profile)
+        if self.player_init:
+            # specific data to each player (score, private data)
+            self.games[room_jid].setdefault("players_data", {})
+            for nick in nicks:
+                # The dict must be COPIED otherwise it is shared between all users
+                self.games[room_jid]["players_data"][nick] = copy.deepcopy(
+                    self.player_init
+                )
+
+    def _player_ready(self, player_nick, referee_jid_s, profile_key=C.PROF_KEY_NONE):
+        self.player_ready(player_nick, jid.JID(referee_jid_s), profile_key)
+
+    def player_ready(self, player_nick, referee_jid, profile_key=C.PROF_KEY_NONE):
+        """Must be called when player is ready to start a new game
+
+        @param player: the player nick in the room
+        @param referee_jid (jid.JID): JID of the referee
+        """
+        profile = self.host.memory.get_profile_name(profile_key)
+        if not profile:
+            log.error(_("profile %s is unknown") % profile_key)
+            return
+        log.debug("new player ready: %s" % profile)
+        # TODO: we probably need to add the game and room names in the sent message
+        self.send(referee_jid, "player_ready", {"player": player_nick}, profile=profile)
+
+    def new_round(self, room_jid, data, profile):
+        """Launch a new round (reinit the user data)
+
+        @param room_jid: room userhost
+        @param data: a couple (common_data, msg_elts) with:
+                    - common_data: backend initialization data for the new round
+                    - msg_elts: dict to map each user to his specific initialization message
+        @param profile
+        """
+        log.debug(_("new round for %s game") % self.name)
+        game_data = self.games[room_jid]
+        players = game_data["players"]
+        players_data = game_data["players_data"]
+        game_data["stage"] = "init"
+
+        common_data, msg_elts = copy.deepcopy(data) if data is not None else (None, None)
+
+        if isinstance(msg_elts, dict):
+            for player in players:
+                to_jid = jid.JID(room_jid.userhost() + "/" + player)  # FIXME: gof:
+                elem = (
+                    msg_elts[player]
+                    if isinstance(msg_elts[player], domish.Element)
+                    else None
+                )
+                self.send(to_jid, elem, profile=profile)
+        elif isinstance(msg_elts, domish.Element):
+            self.send(room_jid, msg_elts, profile=profile)
+        if common_data is not None:
+            for player in players:
+                players_data[player].update(copy.deepcopy(common_data))
+
+    def _create_game_elt(self, to_jid):
+        """Create a generic domish Element for the game messages
+
+        @param to_jid: JID of the recipient
+        @return: the created element
+        """
+        type_ = "normal" if to_jid.resource else "groupchat"
+        elt = domish.Element((None, "message"))
+        elt["to"] = to_jid.full()
+        elt["type"] = type_
+        elt.addElement(self.ns_tag)
+        return elt
+
+    def _create_start_element(self, players=None, name="started"):
+        """Create a domish Element listing the game users
+
+        @param players: list of the players
+        @param name: element name:
+                    - "started" to signal the players that the game has been started
+                    - "players" to signal the list of players when the game is not started yet
+        @return the create element
+        """
+        started_elt = domish.Element((None, name))
+        if players is None:
+            return started_elt
+        idx = 0
+        for player in players:
+            player_elt = domish.Element((None, "player"))
+            player_elt.addContent(player)
+            player_elt["index"] = str(idx)
+            idx += 1
+            started_elt.addChild(player_elt)
+        return started_elt
+
+    def _send_elements(self, to_jid, data, profile=None):
+        """ TODO
+
+        @param to_jid: recipient JID
+        @param data: list of (elem, attr, content) with:
+                    - elem: domish.Element, unicode or a couple:
+                            - domish.Element to be directly added as a child to the message
+                            - unicode name or couple (uri, name) to create a new domish.Element
+                              and add it as a child to the message (see domish.Element.addElement)
+                    - attrs: dictionary of attributes for the new child
+                    - content: unicode that is appended to the child content
+        @param profile: the profile from which the message is sent
+        @return: a Deferred instance
+        """
+        client = self.host.get_client(profile)
+        msg = self._create_game_elt(to_jid)
+        for elem, attrs, content in data:
+            if elem is not None:
+                if isinstance(elem, domish.Element):
+                    msg.firstChildElement().addChild(elem)
+                else:
+                    elem = msg.firstChildElement().addElement(elem)
+                if attrs is not None:
+                    elem.attributes.update(attrs)
+                if content is not None:
+                    elem.addContent(content)
+        client.send(msg)
+        return defer.succeed(None)
+
+    def send(self, to_jid, elem=None, attrs=None, content=None, profile=None):
+        """ TODO
+
+        @param to_jid: recipient JID
+        @param elem: domish.Element, unicode or a couple:
+                    - domish.Element to be directly added as a child to the message
+                    - unicode name or couple (uri, name) to create a new domish.Element
+                      and add it as a child to the message (see domish.Element.addElement)
+        @param attrs: dictionary of attributes for the new child
+        @param content: unicode that is appended to the child content
+        @param profile: the profile from which the message is sent
+        @return: a Deferred instance
+        """
+        return self._send_elements(to_jid, [(elem, attrs, content)], profile)
+
+    def get_handler(self, client):
+        return RoomGameHandler(self)
+
+
+@implementer(iwokkel.IDisco)
+class RoomGameHandler(XMPPHandler):
+
+    def __init__(self, plugin_parent):
+        self.plugin_parent = plugin_parent
+        self.host = plugin_parent.host
+
+    def connectionInitialized(self):
+        self.xmlstream.addObserver(
+            self.plugin_parent.request,
+            self.plugin_parent.room_game_cmd,
+            profile=self.parent.profile,
+        )
+
+    def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
+        return [disco.DiscoFeature(self.plugin_parent.ns_tag[0])]
+
+    def getDiscoItems(self, requestor, target, nodeIdentifier=""):
+        return []