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

"""
SAT plugin for parrot mode (experimental)
Copyright (C) 2009, 2010, 2011, 2012  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 logging import debug, info, warning, error
from twisted.words.protocols.jabber import jid


from sat.core.exceptions import UnknownEntityError
from sat.tools.misc import SkipOtherTriggers 

PLUGIN_INFO = {
"name": "Parrot Plugin",
"import_name": "EXP-PARROT",
"type": "EXP",
"protocols": [],
"dependencies": ["XEP-0045"],
"main": "Exp_Parrot",
"handler": "no",
"description": _("""Implementation of parrot mode (repeat messages between 2 entities)""")
}

class Exp_Parrot():
    """Parrot mode plugin: repeat messages from one entity or MUC room to another one"""
    #XXX: This plugin can be potentially dangerous if we don't trust entities linked
    #     this is specially true if we have other triggers.
    #     sendMessageTrigger avoid other triggers execution, it's deactivated to allow
    #     /unparrot command in text commands plugin.

    def __init__(self, host):
        info(_("Plugin Parrot initialization"))
        self.host = host
        host.trigger.add("MessageReceived", self.MessageReceivedTrigger, priority=100)
        #host.trigger.add("sendMessage", self.sendMessageTrigger, priority=100)

    #def sendMessageTrigger(self, mess_data, profile):
    #    """ Deactivate other triggers if recipient is in parrot links """
    #    client = self.host.getClient(profile)
    #    try:
    #        _links = client.parrot_links
    #    except AttributeError:
    #        return True
    #    
    #    if mess_data['to'].userhostJID() in _links.values():
    #        debug("Parrot link detected, skipping other triggers")
    #        raise SkipOtherTriggers 

    def MessageReceivedTrigger(self, message, profile):
        """ Check if source is linked and repeat message, else do nothing  """
        client = self.host.getClient(profile)
        from_jid = jid.JID(message["from"])
            
        try:
            _links = client.parrot_links
        except AttributeError:
            return True
        
        if not from_jid.userhostJID() in _links:
            return True
       
        for e in message.elements():
            if e.name == "body":
                mess_body = e.children[0] if e.children else ""
                
                try:
                    entity_type = self.host.memory.getEntityData(from_jid, ['type'], profile)["type"]
                except (UnknownEntityError, KeyError):
                    entity_type = "contact"
                if entity_type == 'chatroom':
                    src_txt = from_jid.resource
                    if src_txt == self.host.plugins["XEP-0045"].getRoomNick(from_jid.userhost(), profile):
                        #we won't repeat our own messages
                        return True
                else:
                    src_txt = from_jid.user
                msg = "[%s] %s" % (src_txt, mess_body)

                linked = _links[from_jid.userhostJID()]

                self.host.sendMessage(unicode(linked), msg, None, "auto", profile_key=profile)
        else:
            warning("No body element found in message, following normal behaviour")
        
        return True

    def addParrot(self, source_jid, dest_jid, profile):
        """Add a parrot link from one entity to another one
        @param source_jid: entity from who messages will be repeated
        @param dest_jid: entity where the messages will be repeated
        @param profile: %(doc_profile_key)s"""
        client = self.host.getClient(profile)
        try:
            _links = client.parrot_links
        except AttributeError:
            _links = client.parrot_links = {}

        _links[source_jid.userhostJID()] = dest_jid
        info("Parrot mode: %s will be repeated to %s" % (source_jid.userhost(), unicode(dest_jid)))

    def removeParrot(self, source_jid, profile):
        """Remove parrot link
        @param source_jid: this entity will no more be repeated
        @param profile: %(doc_profile_key)s"""
        client = self.host.getClient(profile)
        try:
            del client.parrot_links[source_jid.userhostJID()]
        except (AttributeError, KeyError):
            pass