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

# SAT plugin for Jabber Search (xep-0055)
# Copyright (C) 2009, 2010, 2011, 2012, 2013 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 logging import debug, info, warning, error
from twisted.words.protocols.jabber.xmlstream import IQ
from twisted.words.protocols.jabber import jid
from wokkel import data_form
from sat.core.exceptions import DataError
from sat.tools.xml_tools import dataForm2XMLUI, dataFormResult2XMLUI

NS_SEARCH = 'jabber:iq:search'

PLUGIN_INFO = {
    "name": "Jabber Search",
    "import_name": "XEP-0055",
    "type": "XEP",
    "protocols": ["XEP-0055"],
    "main": "XEP_0055",
    "handler": "no",
    "description": _("""Implementation of Jabber Search""")
}


class XEP_0055(object):

    def __init__(self, host):
        info(_("Jabber search plugin initialization"))
        self.host = host
        host.bridge.addMethod("getSearchUI", ".plugin", in_sign='ss', out_sign='s',
                              method=self._getSearchUI,
                              async=True)
        host.bridge.addMethod("searchRequest", ".plugin", in_sign='sa{ss}s', out_sign='s',
                              method=self._searchRequest,
                              async=True)

    def _getSearchUI(self, to_jid_s, profile_key):
        return self.getSearchUI(jid.JID(to_jid_s), profile_key)

    def getSearchUI(self, to_jid, profile_key):
        """ Ask for a search interface
        @param to_jid: XEP-0055 compliant search entity
        @param profile_key: %(doc_profile_key)s
        @return: XMLUI search interface """
        client = self.host.getClient(profile_key)
        fields_request = IQ(client.xmlstream, 'get')
        fields_request["from"] = client.jid.full()
        fields_request["to"] = to_jid.full()
        fields_request.addElement('query', NS_SEARCH)
        d = fields_request.send(to_jid.full())
        d.addCallbacks(self._fieldsOk, self._fieldsErr, callbackArgs=[client.profile], errbackArgs=[client.profile])
        return d

    def _fieldsOk(self, answer, profile):
        """got fields available"""
        try:
            query_elts = answer.elements('jabber:iq:search', 'query').next()
        except StopIteration:
            info(_("No query element found"))
            raise DataError # FIXME: StanzaError is probably more appropriate, check the RFC
        try:
            form_elt = query_elts.elements(data_form.NS_X_DATA, 'x').next()
        except StopIteration:
            info(_("No data form found"))
            raise NotImplementedError("Only search through data form is implemented so far")
        parsed_form = data_form.Form.fromElement(form_elt)
        return dataForm2XMLUI(parsed_form, "").toXml()

    def _fieldsErr(self, failure, profile):
        """ Called when something is wrong with fields request """
        info(_("Fields request failure: %s") % str(failure.value))
        return failure

    def _searchRequest(self, to_jid_s, search_dict, profile_key):
        return self.searchRequest(jid.JID(to_jid_s), search_dict, profile_key)

    def searchRequest(self, to_jid, search_dict, profile_key):
        """ Actually do a search, according to filled data
        @param to_jid: XEP-0055 compliant search entity
        @param search_dict: filled data, corresponding to the form obtained in getSearchUI
        @param profile_key: %(doc_profile_key)s
        @return: XMLUI search result """
        client = self.host.getClient(profile_key)
        search_request = IQ(client.xmlstream, 'set')
        search_request["from"] = client.jid.full()
        search_request["to"] = to_jid.full()
        query_elt = search_request.addElement('query', NS_SEARCH)
        x_form = data_form.Form('submit', formNamespace = NS_SEARCH)
        x_form.makeFields(search_dict)
        query_elt.addChild(x_form.toElement())
        d = search_request.send(to_jid.full())
        d.addCallbacks(self._searchOk, self._searchErr, callbackArgs=[client.profile], errbackArgs=[client.profile])
        return d

    def _searchOk(self, answer, profile):
        """got search available"""
        try:
            query_elts = answer.elements('jabber:iq:search', 'query').next()
        except StopIteration:
            info(_("No query element found"))
            raise DataError # FIXME: StanzaError is probably more appropriate, check the RFC
        try:
            form_elt = query_elts.elements(data_form.NS_X_DATA, 'x').next()
        except StopIteration:
            info(_("No data form found"))
            raise NotImplementedError("Only search through data form is implemented so far")
        xmlui = dataFormResult2XMLUI(form_elt).toXml()
        print "=== XMLUI ===\n%s\n\n" %  xmlui
        return xmlui


    def _searchErr(self, failure, profile):
        """ Called when something is wrong with search request """
        info(_("Search request failure: %s") % str(failure.value))
        return failure