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

# SAT: a jabber client
# Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 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 _

from sat.core import exceptions
from sat.core.constants import Const as C
from xml.dom import minidom
from logging import debug, info, warning, error
from twisted.internet import defer
from twisted.python.failure import Failure
from sat.tools.xml_tools import paramsXML2XMLUI


class Params(object):
    """This class manage parameters with xml"""
    ### TODO: add desciption in params

    #TODO: move Watched in a plugin
    #TODO: when priority is changed, a new presence stanza must be emitted
    #TODO: int type (Priority should be int instead of string)
    default_xml = u"""
    <params>
    <general>
    </general>
    <individual>
        <category name="Connection" label="%(category_connection)s">
            <param name="JabberID" value="name@example.org/SàT" type="string" />
            <param name="Password" value="" type="password" />
            <param name="Priority" value="50" type="string" />
            <param name="Server" value="example.org" type="string" />
            <param name="Port" value="5222" type="string" />
            <param name="NewAccount" label="%(label_NewAccount)s" type="button" callback_id="registerNewAccount"/>
            <param name="autoconnect" label="%(label_autoconnect)s" value="true" type="bool" />
            <param name="autodisconnect" label="%(label_autodisconnect)s" value="false"  type="bool" />
        </category>
        <category name="Misc" label="%(category_misc)s">
            <param name="Watched" value="test@Jabber.goffi.int" type="string" />
        </category>
    </individual>
    </params>
    """ % {
        'category_connection': _("Connection"),
        'label_NewAccount': _("Register new account"),
        'label_autoconnect': _('Connect on frontend startup'),
        'label_autodisconnect': _('Disconnect on frontend closure'),
        'category_misc': _("Misc")
    }

    def load_default_params(self):
        self.dom = minidom.parseString(Params.default_xml.encode('utf-8'))

    def _mergeParams(self, source_node, dest_node):
        """Look for every node in source_node and recursively copy them to dest if they don't exists"""

        def getNodesMap(children):
            ret = {}
            for child in children:
                if child.nodeType == child.ELEMENT_NODE:
                    ret[(child.tagName, child.getAttribute('name'))] = child
            return ret
        source_map = getNodesMap(source_node.childNodes)
        dest_map = getNodesMap(dest_node.childNodes)
        source_set = set(source_map.keys())
        dest_set = set(dest_map.keys())
        to_add = source_set.difference(dest_set)

        for node_key in to_add:
            dest_node.appendChild(source_map[node_key].cloneNode(True))

        to_recurse = source_set - to_add
        for node_key in to_recurse:
            self._mergeParams(source_map[node_key], dest_map[node_key])

    def load_xml(self, xml_file):
        """Load parameters template from file"""
        self.dom = minidom.parse(xml_file)
        default_dom = minidom.parseString(Params.default_xml.encode('utf-8'))
        self._mergeParams(default_dom.documentElement, self.dom.documentElement)

    def loadGenParams(self):
        """Load general parameters data from storage
        @return: deferred triggered once params are loaded"""
        return self.storage.loadGenParams(self.params_gen)

    def loadIndParams(self, profile, cache=None):
        """Load individual parameters
        set self.params cache or a temporary cache
        @param profile: profile to load (*must exist*)
        @param cache: if not None, will be used to store the value, as a short time cache
        @return: deferred triggered once params are loaded"""
        if cache is None:
            self.params[profile] = {}
        return self.storage.loadIndParams(self.params[profile] if cache is None else cache, profile)

    def purgeProfile(self, profile):
        """Remove cache data of a profile
        @param profile: %(doc_profile)s"""
        try:
            del self.params[profile]
        except KeyError:
            error(_("Trying to purge cache of a profile not in memory: [%s]") % profile)

    def save_xml(self, filename):
        """Save parameters template to xml file"""
        with open(filename, 'wb') as xml_file:
            xml_file.write(self.dom.toxml('utf-8'))

    def __init__(self, host, storage):
        debug("Parameters init")
        self.host = host
        self.storage = storage
        self.default_profile = None
        self.params = {}
        self.params_gen = {}
        host.registerCallback(host.registerNewAccountCB, with_data=True, force_id="registerNewAccount")

    def asyncCreateProfile(self, profile):
        """Create a new profile
        @param profile: name of the profile
        @param callback: called when the profile actually exists in database and memory
        @return: a Deferred instance
        """
        if self.storage.hasProfile(profile):
            info(_('The profile name already exists'))
            return defer.fail(Failure(exceptions.ConflictError))
        if not self.host.trigger.point("ProfileCreation", profile):
            return defer.fail(Failure(exceptions.CancelError))
        return self.storage.createProfile(profile)

    def asyncDeleteProfile(self, profile, force=False):
        """Delete an existing profile
        @param profile: name of the profile
        @param force: force the deletion even if the profile is connected.
        To be used for direct calls only (not through the bridge).
        @return: a Deferred instance
        """
        if not self.storage.hasProfile(profile):
            info(_('Trying to delete an unknown profile'))
            return defer.fail(Failure(exceptions.ProfileUnknownError))
        if not force and self.host.isConnected(profile):
            info(_("Trying to delete a connected profile"))
            return defer.fail(Failure(exceptions.ConnectedProfileError))
        return self.storage.deleteProfile(profile)

    def getProfileName(self, profile_key, return_profile_keys = False):
        """return profile according to profile_key
        @param profile_key: profile name or key which can be
                            @ALL@ for all profiles
                            @DEFAULT@ for default profile
        @param return_profile_keys: if True, return unmanaged profile keys (like "@ALL@"). This keys must be managed by the caller
        @return: requested profile name or emptry string if it doesn't exist"""
        if profile_key == '@DEFAULT@':
            default = self.host.memory.memory_data.get('Profile_default')
            if not default:
                info(_('No default profile, returning first one'))  # TODO: manage real default profile
                try:
                    default = self.host.memory.memory_data['Profile_default'] = self.storage.getProfilesList()[0]
                except IndexError:
                    info(_('No profile exist yet'))
                    return ""
            return default  # FIXME: temporary, must use real default value, and fallback to first one if it doesn't exists
        elif profile_key == C.PROF_KEY_NONE:
            raise exceptions.ProfileNotSetError
        elif return_profile_keys and profile_key in ["@ALL@"]:
            return profile_key # this value must be managed by the caller
        if not self.storage.hasProfile(profile_key):
            info(_('Trying to access an unknown profile'))
            return "" # FIXME: raise exceptions.ProfileUnknownError here (must be well checked, this method is used in lot of places)
        return profile_key

    def __get_unique_node(self, parent, tag, name):
        """return node with given tag
        @param parent: parent of nodes to check (e.g. documentElement)
        @param tag: tag to check (e.g. "category")
        @param name: name to check (e.g. "JID")
        @return: node if it exist or None
        """
        for node in parent.childNodes:
            if node.nodeName == tag and node.getAttribute("name") == name:
                #the node already exists
                return node
        #the node is new
        return None

    def updateParams(self, xml, security_limit=C.NO_SECURITY_LIMIT, app=''):
        """import xml in parameters, update if the param already exists
        If security_limit is specified and greater than -1, the parameters
        that have a security level greater than security_limit are skipped.
        @param xml: parameters in xml form
        @param security_limit: -1 means no security, 0 is the maximum security then the higher the less secure
        @param app: name of the frontend registering the parameters or empty value
        """
        src_parent = minidom.parseString(xml.encode('utf-8')).documentElement

        def pre_process_app_node(src_parent, security_limit, app):
            """Parameters that are registered from a frontend must be checked"""
            to_remove = []
            for type_node in src_parent.childNodes:
                if type_node.nodeName != C.INDIVIDUAL:
                    to_remove.append(type_node)  # accept individual parameters only
                    continue
                for cat_node in type_node.childNodes:
                    if cat_node.nodeName != 'category':
                        to_remove.append(cat_node)
                        continue
                    to_remove_count = 0  # count the params to be removed from current category
                    for node in cat_node.childNodes:
                        if node.nodeName != "param" or not self.checkSecurityLimit(node, security_limit):
                            to_remove.append(node)
                            to_remove_count += 1
                            continue
                        node.setAttribute('app', app)
                    if len(cat_node.childNodes) == to_remove_count:  # remove empty category
                        for dummy in xrange(0, to_remove_count):
                            to_remove.pop()
                        to_remove.append(cat_node)
            for node in to_remove:
                node.parentNode.removeChild(node)

        def import_node(tgt_parent, src_parent):
            for child in src_parent.childNodes:
                if child.nodeName == '#text':
                    continue
                node = self.__get_unique_node(tgt_parent, child.nodeName, child.getAttribute("name"))
                if not node:  # The node is new
                    tgt_parent.appendChild(child)
                else:
                    if child.nodeName == "param":
                        # The child updates an existing parameter, we replace the node
                        tgt_parent.replaceChild(child, node)
                    else:
                        # the node already exists, we recurse 1 more level
                        import_node(node, child)

        if app:
            pre_process_app_node(src_parent, security_limit, app)
        import_node(self.dom.documentElement, src_parent)

    def paramsRegisterApp(self, xml, security_limit, app):
        """Register frontend's specific parameters
        If security_limit is specified and greater than -1, the parameters
        that have a security level greater than security_limit are skipped.
        @param xml: XML definition of the parameters to be added
        @param security_limit: -1 means no security, 0 is the maximum security then the higher the less secure
        @param app: name of the frontend registering the parameters
        """
        if not app:
            warning(_("Trying to register frontends parameters with no specified app: aborted"))
            return
        if not hasattr(self, "frontends_cache"):
            self.frontends_cache = []
        if app in self.frontends_cache:
            debug(_("Trying to register twice frontends parameters for %(app)s: aborted" % {"app": app}))
            return
        self.frontends_cache.append(app)
        self.updateParams(xml, security_limit, app)
        debug("Frontends parameters registered for %(app)s" % {'app': app})

    def __default_ok(self, value, name, category):
        #FIXME: will not work with individual parameters
        self.setParam(name, value, category)

    def __default_ko(self, failure, name, category):
        error(_("Can't determine default value for [%(category)s/%(name)s]: %(reason)s") % {'category': category, 'name': name, 'reason': str(failure.value)})

    def setDefault(self, name, category, callback, errback=None):
        """Set default value of parameter
        'default_cb' attibute of parameter must be set to 'yes'
        @param name: name of the parameter
        @param category: category of the parameter
        @param callback: must return a string with the value (use deferred if needed)
        @param errback: must manage the error with args failure, name, category
        """
        #TODO: send signal param update if value changed
        #TODO: manage individual paramaters
        debug ("setDefault called for %(category)s/%(name)s" % {"category": category, "name": name})
        node = self._getParamNode(name, category, '@ALL@')
        if not node:
            error(_("Requested param [%(name)s] in category [%(category)s] doesn't exist !") % {'name': name, 'category': category})
            return
        if node[1].getAttribute('default_cb') == 'yes':
            # del node[1].attributes['default_cb'] # default_cb is not used anymore as a flag to know if we have to set the default value,
                                                   # and we can still use it later e.g. to call a generic setDefault method
            value = self._getParam(category, name, C.GENERAL)
            if value is None: # no value set by the user: we have the default value
                debug ("Default value to set, using callback")
                d = defer.maybeDeferred(callback)
                d.addCallback(self.__default_ok, name, category)
                d.addErrback(errback or self.__default_ko, name, category)

    def _getAttr(self, node, attr, value):
        """ get attribute value
        @param node: XML param node
        @param attr: name of the attribute to get (e.g.: 'value' or 'type')
        @param value: user defined value"""
        if attr == 'value':
            value_to_use = value if value is not None else node.getAttribute(attr)  # we use value (user defined) if it exist, else we use node's default value
            if node.getAttribute('type') == 'bool':
                return value_to_use.lower() not in ('false', '0', 'no')
            return value_to_use
        return node.getAttribute(attr)

    def __type_to_string(self, result):
        """ convert result to string, according to its type """
        if isinstance(result, bool):
            return "true" if result else "false"
        return result

    def getStringParamA(self, name, category, attr="value", profile_key=C.PROF_KEY_NONE):
        """ Same as getParamA but for bridge: convert non string value to string """
        return self.__type_to_string(self.getParamA(name, category, attr, profile_key))

    def getParamA(self, name, category, attr="value", profile_key=C.PROF_KEY_NONE):
        """Helper method to get a specific attribute
           @param name: name of the parameter
           @param category: category of the parameter
           @param attr: name of the attribute (default: "value")
           @param profile: owner of the param (@ALL@ for everyone)

           @return: attribute"""
        #FIXME: looks really dirty and buggy, need to be reviewed/refactored
        node = self._getParamNode(name, category)
        if not node:
            error(_("Requested param [%(name)s] in category [%(category)s] doesn't exist !") % {'name': name, 'category': category})
            raise exceptions.NotFound

        if node[0] == C.GENERAL:
            value = self._getParam(category, name, C.GENERAL)
            return self._getAttr(node[1], attr, value)

        assert node[0] == C.INDIVIDUAL

        profile = self.getProfileName(profile_key)
        if not profile:
            error(_('Requesting a param for an non-existant profile'))
            raise exceptions.ProfileUnknownError

        if profile not in self.params:
            error(_('Requesting synchronous param for not connected profile'))
            raise exceptions.NotConnectedProfileError(profile)

        if attr == "value":
            value = self._getParam(category, name, profile=profile)
            return self._getAttr(node[1], attr, value)

    def asyncGetStringParamA(self, name, category, attr="value", security_limit=C.NO_SECURITY_LIMIT, profile_key=C.PROF_KEY_NONE):
        d = self.asyncGetParamA(name, category, attr, security_limit, profile_key)
        d.addCallback(self.__type_to_string)
        return d

    def asyncGetParamA(self, name, category, attr="value", security_limit=C.NO_SECURITY_LIMIT, profile_key=C.PROF_KEY_NONE):
        """Helper method to get a specific attribute
           @param name: name of the parameter
           @param category: category of the parameter
           @param attr: name of the attribute (default: "value")
           @param profile: owner of the param (@ALL@ for everyone)"""
        node = self._getParamNode(name, category)
        if not node:
            error(_("Requested param [%(name)s] in category [%(category)s] doesn't exist !") % {'name': name, 'category': category})
            return None

        if not self.checkSecurityLimit(node[1], security_limit):
            warning(_("Trying to get parameter '%(param)s' in category '%(cat)s' without authorization!!!"
                      % {'param': name, 'cat': category}))
            return None

        if node[0] == C.GENERAL:
            value = self._getParam(category, name, C.GENERAL)
            return defer.succeed(self._getAttr(node[1], attr, value))

        assert node[0] == C.INDIVIDUAL

        profile = self.getProfileName(profile_key)
        if not profile:
            error(_('Requesting a param for a non-existant profile'))
            return defer.fail()

        if attr != "value":
            return defer.succeed(node[1].getAttribute(attr))
        try:
            value = self._getParam(category, name, profile=profile)
            return defer.succeed(self._getAttr(node[1], attr, value))
        except exceptions.ProfileNotInCacheError:
            #We have to ask data to the storage manager
            d = self.storage.getIndParam(category, name, profile)
            return d.addCallback(lambda value: self._getAttr(node[1], attr, value))

    def _getParam(self, category, name, type_=C.INDIVIDUAL, cache=None, profile=C.PROF_KEY_NONE):
        """Return the param, or None if it doesn't exist
        @param category: param category
        @param name: param name
        @param type_: GENERAL or INDIVIDUAL
        @param cache: temporary cache, to use when profile is not logged
        @param profile: the profile name (not profile key, i.e. name and not something like @DEFAULT@)
        @return: param value or None if it doesn't exist
        """
        if type_ == C.GENERAL:
            if (category, name) in self.params_gen:
                return self.params_gen[(category, name)]
            return None  # This general param has the default value
        assert (type_ == C.INDIVIDUAL)
        if profile == C.PROF_KEY_NONE:
            raise exceptions.ProfileNotSetError
        if profile in self.params:
            cache = self.params[profile]  # if profile is in main cache, we use it,
                                          # ignoring the temporary cache
        elif cache is None:  # else we use the temporary cache if it exists, or raise an exception
            raise exceptions.ProfileNotInCacheError
        if (category, name) not in cache:
            return None
        return cache[(category, name)]

    def __constructProfileXml(self, security_limit, app, profile):
        """Construct xml for asked profile, filling values when needed
        /!\ as noticed in doc, don't forget to unlink the minidom.Document
        @param security_limit: NO_SECURITY_LIMIT (-1) to return all the params.
        Otherwise sole the params which have a security level defined *and*
        lower or equal to the specified value are returned.
        @param app: name of the frontend requesting the parameters, or '' to get all parameters
        @param profile: profile name (not key !)
        @return: a deferred that fire a minidom.Document of the profile xml (cf warning above)
        """

        def checkNode(node):
            """Check the node against security_limit and app"""
            return self.checkSecurityLimit(node, security_limit) and self.checkApp(node, app)

        def constructProfile(ignore, profile_cache):
            # init the result document
            prof_xml = minidom.parseString('<params/>')
            cache = {}

            for type_node in self.dom.documentElement.childNodes:
                if type_node.nodeName != C.GENERAL and type_node.nodeName != C.INDIVIDUAL:
                    continue
                # we use all params, general and individual
                for cat_node in type_node.childNodes:
                    if cat_node.nodeName != 'category':
                        continue
                    category = cat_node.getAttribute('name')
                    dest_params = {}  # result (merged) params for category
                    if category not in cache:
                        # we make a copy for the new xml
                        cache[category] = dest_cat = cat_node.cloneNode(True)
                        for node in dest_cat.childNodes:
                            if node.nodeName != "param":
                                continue
                            if not checkNode(node):
                                dest_cat.removeChild(node)
                                continue
                            dest_params[node.getAttribute('name')] = node
                        new_node = True
                    else:
                        # It's not a new node, we use the previously cloned one
                        dest_cat = cache[category]
                        new_node = False
                    params = cat_node.getElementsByTagName("param")

                    for param_node in params:
                        # we have to merge new params (we are parsing individual parameters, we have to add them
                        # to the previously parsed general ones)
                        name = param_node.getAttribute('name')
                        if not checkNode(param_node):
                            continue
                        if name not in dest_params:
                            # this is reached when a previous category exists
                            dest_params[name] = param_node.cloneNode(True)
                            dest_cat.appendChild(dest_params[name])

                        profile_value = self._getParam(category,
                                                        name, type_node.nodeName,
                                                        cache=profile_cache, profile=profile)
                        if profile_value is not None:
                            # there is a value for this profile, we must change the default
                            dest_params[name].setAttribute('value', profile_value)
                    if new_node:
                        prof_xml.documentElement.appendChild(dest_cat)

            to_remove = []
            for cat_node in prof_xml.documentElement.childNodes:
                # we remove empty categories
                if cat_node.getElementsByTagName("param").length == 0:
                    to_remove.append(cat_node)
            for node in to_remove:
                prof_xml.documentElement.removeChild(node)
            return prof_xml

        if profile in self.params:
            d = defer.succeed(None)
            profile_cache = self.params[profile]
        else:
            #profile is not in cache, we load values in a short time cache
            profile_cache = {}
            d = self.loadIndParams(profile, profile_cache)

        return d.addCallback(constructProfile, profile_cache)

    def getParamsUI(self, security_limit, app, profile_key):
        """
        @param security_limit: NO_SECURITY_LIMIT (-1) to return all the params.
        Otherwise sole the params which have a security level defined *and*
        lower or equal to the specified value are returned.
        @param app: name of the frontend requesting the parameters, or '' to get all parameters
        @param profile_key: Profile key which can be either a magic (eg: @DEFAULT@) or the name of an existing profile.
        @return: a SàT XMLUI for parameters
        """
        profile = self.getProfileName(profile_key)
        if not profile:
            error(_("Asking params for inexistant profile"))
            return ""
        d = self.getParams(security_limit, app, profile)
        return d.addCallback(lambda param_xml: paramsXML2XMLUI(param_xml))

    def getParams(self, security_limit, app, profile_key):
        """Construct xml for asked profile, take params xml as skeleton
        @param security_limit: NO_SECURITY_LIMIT (-1) to return all the params.
        Otherwise sole the params which have a security level defined *and*
        lower or equal to the specified value are returned.
        @param app: name of the frontend requesting the parameters, or '' to get all parameters
        @param profile_key: Profile key which can be either a magic (eg: @DEFAULT@) or the name of an existing profile.
        @return: XML of parameters
        """
        profile = self.getProfileName(profile_key)
        if not profile:
            error(_("Asking params for inexistant profile"))
            return defer.succeed("")

        def returnXML(prof_xml):
            return_xml = prof_xml.toxml()
            prof_xml.unlink()
            return '\n'.join((line for line in return_xml.split('\n') if line))

        return self.__constructProfileXml(security_limit, app, profile).addCallback(returnXML)

    def getParamsForCategory(self, category, security_limit, app, profile_key):
        """
        @param category: the desired category
        @param security_limit: NO_SECURITY_LIMIT (-1) to return all the params.
        Otherwise sole the params which have a security level defined *and*
        lower or equal to the specified value are returned.
        @param app: name of the frontend requesting the parameters, or '' to get all parameters
        @param profile_key: Profile key which can be either a magic (eg: @DEFAULT@) or the name of an existing profile.
        @return: node's xml for selected category
        """
        #TODO: manage category of general type (without existant profile)
        profile = self.getProfileName(profile_key)
        if not profile:
            error(_("Asking params for inexistant profile"))
            return ""

        def returnCategoryXml(prof_xml):
            for node in prof_xml.getElementsByTagName("category"):
                if node.nodeName == "category" and node.getAttribute("name") == category:
                    result = node.toxml()
                    prof_xml.unlink()
                    return result

            prof_xml.unlink()
            return "<category />"

        d = self.__constructProfileXml(security_limit, app, profile)
        return d.addCallback(returnCategoryXml)

    def _getParamNode(self, name, category, type_="@ALL@"):  # FIXME: is type_ useful ?
        """Return a node from the param_xml
        @param name: name of the node
        @param category: category of the node
        @type_: keyword for search:
                                    @ALL@ search everywhere
                                    @GENERAL@ only search in general type
                                    @INDIVIDUAL@ only search in individual type
        @return: a tuple with the node type and the the node, or None if not found"""

        for type_node in self.dom.documentElement.childNodes:
            if (((type_ == "@ALL@" or type_ == "@GENERAL@") and type_node.nodeName == C.GENERAL)
                    or ((type_ == "@ALL@" or type_ == "@INDIVIDUAL@") and type_node.nodeName == C.INDIVIDUAL)):
                for node in type_node.getElementsByTagName('category'):
                    if node.getAttribute("name") == category:
                        params = node.getElementsByTagName("param")
                        for param in params:
                            if param.getAttribute("name") == name:
                                return (type_node.nodeName, param)
        return None

    def getParamsCategories(self):
        """return the categories availables"""
        categories = []
        for cat in self.dom.getElementsByTagName("category"):
            name = cat.getAttribute("name")
            if name not in categories:
                categories.append(cat.getAttribute("name"))
        return categories

    def setParam(self, name, value, category, security_limit=C.NO_SECURITY_LIMIT, profile_key=C.PROF_KEY_NONE):
        """Set a parameter, return None if the parameter is not in param xml"""
        #TODO: use different behaviour depending of the data type (e.g. password encrypted)
        if profile_key != C.PROF_KEY_NONE:
            profile = self.getProfileName(profile_key)
            if not profile:
                error(_('Trying to set parameter for an unknown profile'))
                return  # TODO: throw an error

        node = self._getParamNode(name, category, '@ALL@')
        if not node:
            error(_('Requesting an unknown parameter (%(category)s/%(name)s)')
                  % {'category': category, 'name': name})
            return

        if not self.checkSecurityLimit(node[1], security_limit):
            warning(_("Trying to set parameter '%(param)s' in category '%(cat)s' without authorization!!!"
                          % {'param': name, 'cat': category}))
            return

        if node[0] == C.GENERAL:
            self.params_gen[(category, name)] = value
            self.storage.setGenParam(category, name, value)
            for profile in self.storage.getProfilesList():
                if self.host.isConnected(profile):
                    self.host.bridge.paramUpdate(name, value, category, profile)
                    self.host.trigger.point("paramUpdateTrigger", name, value, category, node[0], profile)
            return

        assert (node[0] == C.INDIVIDUAL)
        assert (profile_key != C.PROF_KEY_NONE)

        type_ = node[1].getAttribute("type")
        if type_ == "button":
            print "clique", node.toxml()
        else:
            if self.host.isConnected(profile):  # key can not exists if profile is not connected
                self.params[profile][(category, name)] = value
            self.host.bridge.paramUpdate(name, value, category, profile)
            self.host.trigger.point("paramUpdateTrigger", name, value, category, node[0], profile)
            self.storage.setIndParam(category, name, value, profile)

    def checkSecurityLimit(self, node, security_limit):
        """Check the given node against the given security limit.
        The value NO_SECURITY_LIMIT (-1) means that everything is allowed.
        @return: True if this node can be accessed with the given security limit.
        """
        if security_limit < 0:
            return True
        if node.hasAttribute("security"):
            if int(node.getAttribute("security")) <= security_limit:
                return True
        return False

    def checkApp(self, node, app):
        """Check the given node against the given app.
        @param node: parameter node
        @param app: name of the frontend requesting the parameters, or '' to get all parameters
        @return: True if this node concerns the given app.
        """
        if not app or not node.hasAttribute("app"):
            return True
        return node.getAttribute("app") == app