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

# SAT plugin for Publish-Subscribe (xep-0060)
# 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.constants import Const as C
from sat.core.log import getLogger
log = getLogger(__name__)
from wokkel.pubsub import PubSubRequest
from wokkel import disco, pubsub
from zope.interface import implements

PLUGIN_INFO = {
    "name": "Publish-Subscribe",
    "import_name": "XEP-0060",
    "type": "XEP",
    "protocols": ["XEP-0060"],
    "dependencies": [],
    "main": "XEP_0060",
    "handler": "yes",
    "description": _("""Implementation of PubSub Protocol""")
}


class XEP_0060(object):
    OPT_ACCESS_MODEL = 'pubsub#access_model'
    OPT_PERSIST_ITEMS = 'pubsub#persist_items'
    OPT_MAX_ITEMS = 'pubsub#max_items'
    OPT_DELIVER_PAYLOADS = 'pubsub#deliver_payloads'
    OPT_SEND_ITEM_SUBSCRIBE = 'pubsub#send_item_subscribe'
    OPT_NODE_TYPE = 'pubsub#node_type'
    OPT_SUBSCRIPTION_TYPE = 'pubsub#subscription_type'
    OPT_SUBSCRIPTION_DEPTH = 'pubsub#subscription_depth'
    OPT_ROSTER_GROUPS_ALLOWED = 'pubsub#roster_groups_allowed'
    OPT_PUBLISH_MODEL = 'pubsub#publish_model'

    def __init__(self, host):
        log.info(_("PubSub plugin initialization"))
        self.host = host
        self.managedNodes = []
        self.clients = {}
        """host.bridge.addMethod("getItems", ".plugin", in_sign='ssa{ss}s', out_sign='as', method=self.getItems,
                              async = True,
                              doc = { 'summary':'retrieve items',
                                      'param_0':'service: pubsub service',
                                      'param_1':'node: node identifier',
                                      'param_2':'\n'.join(['options: can be:',
                                          '- max_items: see XEP-0060 #6.5.7',
                                          '- sub_id: subscription identifier, see XEP-0060 #7.2.2.2']),
                                      'param_3':'%(doc_profile)s',
                                      'return':'array of raw XML (content of the items)'
                                    })"""

    def getHandler(self, profile):
        self.clients[profile] = SatPubSubClient(self.host, self)
        return self.clients[profile]

    def addManagedNode(self, node_name, callback):
        """Add a handler for a namespace
        @param namespace: NS of the handler (will appear in disco info)
        @param callback: method to call when the handler is found
        @param profile: profile which manage this handler"""
        self.managedNodes.append((node_name, callback))

    def __getClientNProfile(self, profile_key, action='do pusbsub'):
        """Return a tuple of (client, profile)
        raise error when the profile doesn't exists
        @param profile_key: as usual :)
        @param action: text of action to show in case of error"""
        profile = self.host.memory.getProfileName(profile_key)
        if not profile:
            err_mess = _('Trying to %(action)s with an unknown profile key [%(profile_key)s]') % {
                'action': action,
                'profile_key': profile_key}
            log.error(err_mess)
            raise Exception(err_mess)
        try:
            client = self.clients[profile]
        except KeyError:
            err_mess = _('INTERNAL ERROR: no handler for required profile')
            log.error(err_mess)
            raise Exception(err_mess)
        return profile, client

    def publish(self, service, nodeIdentifier, items=None, profile_key=C.PROF_KEY_NONE):
        profile, client = self.__getClientNProfile(profile_key, 'publish item')
        return client.publish(service, nodeIdentifier, items, client.parent.jid)

    def getItems(self, service, node, max_items=None, item_ids=None, sub_id=None, profile_key=C.PROF_KEY_NONE):
        profile, client = self.__getClientNProfile(profile_key, 'get items')
        return client.items(service, node, max_items, item_ids, sub_id, client.parent.jid)

    def getOptions(self, service, nodeIdentifier, subscriber, subscriptionIdentifier=None, profile_key=C.PROF_KEY_NONE):
        profile, client = self.__getClientNProfile(profile_key, 'get options')
        return client.getOptions(service, nodeIdentifier, subscriber, subscriptionIdentifier)

    def setOptions(self, service, nodeIdentifier, subscriber, options, subscriptionIdentifier=None, profile_key=C.PROF_KEY_NONE):
        profile, client = self.__getClientNProfile(profile_key, 'set options')
        return client.setOptions(service, nodeIdentifier, subscriber, options, subscriptionIdentifier)

    def createNode(self, service, nodeIdentifier, options, profile_key=C.PROF_KEY_NONE):
        profile, client = self.__getClientNProfile(profile_key, 'create node')
        return client.createNode(service, nodeIdentifier, options)

    def deleteNode(self, service, nodeIdentifier, profile_key=C.PROF_KEY_NONE):
        profile, client = self.__getClientNProfile(profile_key, 'delete node')
        return client.deleteNode(service, nodeIdentifier)

    def retractItems(self, service, nodeIdentifier, itemIdentifiers, profile_key=C.PROF_KEY_NONE):
        profile, client = self.__getClientNProfile(profile_key, 'retract items')
        return client.retractItems(service, nodeIdentifier, itemIdentifiers)

    def subscribe(self, service, nodeIdentifier, sub_jid=None, options=None, profile_key=C.PROF_KEY_NONE):
        profile, client = self.__getClientNProfile(profile_key, 'subscribe node')
        return client.subscribe(service, nodeIdentifier, sub_jid or client.parent.jid.userhostJID(), options=options)


class SatPubSubClient(pubsub.PubSubClient):
    implements(disco.IDisco)

    def __init__(self, host, parent_plugin):
        self.host = host
        self.parent_plugin = parent_plugin
        pubsub.PubSubClient.__init__(self)

    def connectionInitialized(self):
        pubsub.PubSubClient.connectionInitialized(self)

    # FIXME: we have to temporary override this method here just
    # to set the attributes itemIdentifiers which is not used
    # in pubsub.PubSubClient.items
    def items(self, service, nodeIdentifier, maxItems=None, itemIdentifiers=None,
              subscriptionIdentifier=None, sender=None):
        """
        Retrieve previously published items from a publish subscribe node.

        @param service: The publish subscribe service that keeps the node.
        @type service: L{JID<twisted.words.protocols.jabber.jid.JID>}

        @param nodeIdentifier: The identifier of the node.
        @type nodeIdentifier: C{unicode}

        @param maxItems: Optional limit on the number of retrieved items.
        @type maxItems: C{int}

        @param itemIdentifiers: Identifiers of the items to be retracted.
        @type itemIdentifiers: C{set}

        @param subscriptionIdentifier: Optional subscription identifier. In
            case the node has been subscribed to multiple times, this narrows
            the results to the specific subscription.
        @type subscriptionIdentifier: C{unicode}
        """
        NS_PUBSUB = 'http://jabber.org/protocol/pubsub'

        request = PubSubRequest('items')
        request.recipient = service
        request.nodeIdentifier = nodeIdentifier
        if maxItems:
            request.maxItems = str(int(maxItems))
        request.subscriptionIdentifier = subscriptionIdentifier
        request.sender = sender
        request.itemIdentifiers = itemIdentifiers  # XXX: this line has been added

        def cb(iq):
            items = []
            for element in iq.pubsub.items.elements():
                if element.uri == NS_PUBSUB and element.name == 'item':
                    items.append(element)
            return items

        d = request.send(self.xmlstream)
        d.addCallback(cb)
        return d

    # FIXME: this should be done in wokkel
    def retractItems(self, service, nodeIdentifier, itemIdentifiers, sender=None):
        """
        Retract items from a publish subscribe node.

        @param service: The publish subscribe service to delete the node from.
        @type service: L{JID<twisted.words.protocols.jabber.jid.JID>}
        @param nodeIdentifier: The identifier of the node.
        @type nodeIdentifier: C{unicode}
        @param itemIdentifiers: Identifiers of the items to be retracted.
        @type itemIdentifiers: C{set}
        """
        request = PubSubRequest('retract')
        request.recipient = service
        request.nodeIdentifier = nodeIdentifier
        request.itemIdentifiers = itemIdentifiers
        request.sender = sender
        return request.send(self.xmlstream)

    def itemsReceived(self, event):
        if not self.host.trigger.point("PubSubItemsReceived", event, self.parent.profile):
            return
        for node in self.parent_plugin.managedNodes:
            if event.nodeIdentifier == node[0]:
                node[1](event, self.parent.profile)

    def deleteReceived(self, event):
        #TODO: manage delete event
        log.debug(_("Publish node deleted"))

    # def purgeReceived(self, event):



    def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
        _disco_info = []
        self.host.trigger.point("PubSub Disco Info", _disco_info, self.parent.profile)
        return _disco_info

    def getDiscoItems(self, requestor, target, nodeIdentifier=''):
        return []