##############################################################################
#
#    OpenERP, Open Source Management Solution
#    Copyright (C) 2004-2012 OpenERP SA (<http://www.openerp.com>).
#
#    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/>.
#
##############################################################################

import operator
import simplejson
import urllib

from openerp import tools
from openerp import SUPERUSER_ID

from datetime import datetime, timedelta
from dateutil import parser
import pytz
from openerp.osv import fields, osv

import logging
_logger = logging.getLogger(__name__)


class Meta(type):
    """ This Meta class allow to define class as a structure, and so instancied variable
        in __init__ to avoid to have side effect alike 'static' variable """
    def __new__(typ, name, parents, attrs):
        methods = dict((k, v) for k, v in attrs.iteritems()
                       if callable(v))
        attrs = dict((k, v) for k, v in attrs.iteritems()
                     if not callable(v))

        def init(self, **kw):
            for k, v in attrs.iteritems():
                setattr(self, k, v)
            for k, v in kw.iteritems():
                assert k in attrs
                setattr(self, k, v)

        methods['__init__'] = init
        methods['__getitem__'] = getattr
        return type.__new__(typ, name, parents, methods)


class Struct(object):
    __metaclass__ = Meta


class OpenerpEvent(Struct):
        event = False
        found = False
        event_id = False
        isRecurrence = False
        isInstance = False
        update = False
        status = False
        attendee_id = False
        synchro = False


class GmailEvent(Struct):
    event = False
    found = False
    isRecurrence = False
    isInstance = False
    update = False
    status = False


class SyncEvent(object):
    def __init__(self):
        self.OE = OpenerpEvent()
        self.GG = GmailEvent()
        self.OP = None

    def __getitem__(self, key):
        return getattr(self, key)

    def compute_OP(self):
        #If event are already in Gmail and in OpenERP
        if self.OE.found and self.GG.found:
            #If the event has been deleted from one side, we delete on other side !
            if self.OE.status != self.GG.status:
                self.OP = Delete((self.OE.status and "OE") or (self.GG.status and "GG"),
                                 'The event has been deleted from one side, we delete on other side !')
            #If event is not deleted !
            elif self.OE.status and self.GG.status:
                if self.OE.update.split('.')[0] != self.GG.update.split('.')[0]:
                    if self.OE.update < self.GG.update:
                        tmpSrc = 'GG'
                    elif self.OE.update > self.GG.update:
                        tmpSrc = 'OE'
                    assert tmpSrc in ['GG', 'OE']

                    #if self.OP.action == None:
                    if self[tmpSrc].isRecurrence:
                        if self[tmpSrc].status:
                            self.OP = Update(tmpSrc, 'Only need to update, because i\'m active')
                        else:
                            self.OP = Exclude(tmpSrc, 'Need to Exclude (Me = First event from recurrence) from recurrence')

                    elif self[tmpSrc].isInstance:
                        self.OP = Update(tmpSrc, 'Only need to update, because already an exclu')
                    else:
                        self.OP = Update(tmpSrc, 'Simply Update... I\'m a single event')
                else:
                    if not self.OE.synchro or self.OE.synchro.split('.')[0] < self.OE.update.split('.')[0]:
                        self.OP = Update('OE', 'Event already updated by another user, but not synchro with my google calendar')
                        #import ipdb; ipdb.set_trace();
                    else:
                        self.OP = NothingToDo("", 'Not update needed')
            else:
                self.OP = NothingToDo("", "Both are already deleted")

        # New in openERP...  Create on create_events of synchronize function
        elif self.OE.found and not self.GG.found:
            #Has been deleted from gmail
            if self.OE.status:
                self.OP = Delete('OE', 'Removed from GOOGLE')
            else:
                self.OP = NothingToDo("", "Already Deleted in gmail and unlinked in OpenERP")
        elif self.GG.found and not self.OE.found:
            tmpSrc = 'GG'
            if not self.GG.status and not self.GG.isInstance:
                # don't need to make something... because event has been created and deleted before the synchronization
                self.OP = NothingToDo("", 'Nothing to do... Create and Delete directly')
            else:
                if self.GG.isInstance:
                    if self[tmpSrc].status:
                        self.OP = Exclude(tmpSrc, 'Need to create the new exclu')
                    else:
                        self.OP = Exclude(tmpSrc, 'Need to copy and Exclude')
                else:
                    self.OP = Create(tmpSrc, 'New EVENT CREATE from GMAIL')

    def __str__(self):
        return self.__repr__()

    def __repr__(self):
        myPrint = "---- A SYNC EVENT ---"
        myPrint += "\n    ID          OE: %s " % (self.OE.event and self.OE.event.id)
        myPrint += "\n    ID          GG: %s " % (self.GG.event and self.GG.event.get('id', False))
        myPrint += "\n    Name        OE: %s " % (self.OE.event and self.OE.event.name)
        myPrint += "\n    Name        GG: %s " % (self.GG.event and self.GG.event.get('summary', False))
        myPrint += "\n    Found       OE:%5s vs GG: %5s" % (self.OE.found, self.GG.found)
        myPrint += "\n    Recurrence  OE:%5s vs GG: %5s" % (self.OE.isRecurrence, self.GG.isRecurrence)
        myPrint += "\n    Instance    OE:%5s vs GG: %5s" % (self.OE.isInstance, self.GG.isInstance)
        myPrint += "\n    Synchro     OE: %10s " % (self.OE.synchro)
        myPrint += "\n    Update      OE: %10s " % (self.OE.update)
        myPrint += "\n    Update      GG: %10s " % (self.GG.update)
        myPrint += "\n    Status      OE:%5s vs GG: %5s" % (self.OE.status, self.GG.status)
        if (self.OP is None):
            myPrint += "\n    Action      %s" % "---!!!---NONE---!!!---"
        else:
            myPrint += "\n    Action      %s" % type(self.OP).__name__
            myPrint += "\n    Source      %s" % (self.OP.src)
            myPrint += "\n    comment     %s" % (self.OP.info)
        return myPrint


class SyncOperation(object):
    def __init__(self, src, info, **kw):
        self.src = src
        self.info = info
        for k, v in kw.items():
            setattr(self, k, v)

    def __str__(self):
        return 'in__STR__'


class Create(SyncOperation):
    pass


class Update(SyncOperation):
    pass


class Delete(SyncOperation):
    pass


class NothingToDo(SyncOperation):
    pass


class Exclude(SyncOperation):
    pass


class google_calendar(osv.AbstractModel):
    STR_SERVICE = 'calendar'
    _name = 'google.%s' % STR_SERVICE

    def generate_data(self, cr, uid, event, context=None):
        if event.allday:
            start_date = fields.datetime.context_timestamp(cr, uid, datetime.strptime(event.date, tools.DEFAULT_SERVER_DATETIME_FORMAT), context=context).isoformat('T').split('T')[0]
            end_date = fields.datetime.context_timestamp(cr, uid, datetime.strptime(event.date, tools.DEFAULT_SERVER_DATETIME_FORMAT) + timedelta(hours=event.duration), context=context).isoformat('T').split('T')[0]
            type = 'date'
            vstype = 'dateTime'
        else:
            start_date = fields.datetime.context_timestamp(cr, uid, datetime.strptime(event.date, tools.DEFAULT_SERVER_DATETIME_FORMAT), context=context).isoformat('T')
            end_date = fields.datetime.context_timestamp(cr, uid, datetime.strptime(event.date_deadline, tools.DEFAULT_SERVER_DATETIME_FORMAT), context=context).isoformat('T')
            type = 'dateTime'
            vstype = 'date'
        attendee_list = []

        for attendee in event.attendee_ids:
            attendee_list.append({
                'email': attendee.email or 'NoEmail@mail.com',
                'displayName': attendee.partner_id.name,
                'responseStatus': attendee.state or 'needsAction',
            })
        data = {
            "summary": event.name or '',
            "description": event.description or '',
            "start": {
                type: start_date,
                vstype: None,
                'timeZone': 'UTC'
            },
            "end": {
                type: end_date,
                vstype: None,
                'timeZone': 'UTC'
            },
            "attendees": attendee_list,
            "location": event.location or '',
            "visibility": event['class'] or 'public',
        }
        if event.recurrency and event.rrule:
            data["recurrence"] = ["RRULE:" + event.rrule]

        if not event.active:
            data["state"] = "cancelled"

        if not self.get_need_synchro_attendee(cr, uid, context=context):
            data.pop("attendees")

        return data

    def create_an_event(self, cr, uid, event, context=None):
        gs_pool = self.pool['google.service']

        data = self.generate_data(cr, uid, event, context=context)

        url = "/calendar/v3/calendars/%s/events?fields=%s&access_token=%s" % ('primary', urllib.quote('id,updated'), self.get_token(cr, uid, context))
        headers = {'Content-type': 'application/json', 'Accept': 'text/plain'}
        data_json = simplejson.dumps(data)

        return gs_pool._do_request(cr, uid, url, data_json, headers, type='POST', context=context)

    def delete_an_event(self, cr, uid, event_id, context=None):
        gs_pool = self.pool['google.service']

        params = {
            'access_token': self.get_token(cr, uid, context)
        }
        headers = {'Content-type': 'application/json', 'Accept': 'text/plain'}
        url = "/calendar/v3/calendars/%s/events/%s" % ('primary', event_id)

        return gs_pool._do_request(cr, uid, url, params, headers, type='DELETE', context=context)

    def get_event_dict(self, cr, uid, token=False, nextPageToken=False, context=None):
        if not token:
            token = self.get_token(cr, uid, context)

        gs_pool = self.pool['google.service']

        params = {
            'fields': 'items,nextPageToken',
            'access_token': token,
            'maxResults': 1000,
            'timeMin': self.get_start_time_to_synchro(cr, uid, context=context).strftime("%Y-%m-%dT%H:%M:%S.%fz"),
        }
        headers = {'Content-type': 'application/json', 'Accept': 'text/plain'}

        url = "/calendar/v3/calendars/%s/events" % 'primary'
        if nextPageToken:
            params['pageToken'] = nextPageToken

        content = gs_pool._do_request(cr, uid, url, params, headers, type='GET', context=context)

        google_events_dict = {}

        for google_event in content['items']:
            google_events_dict[google_event['id']] = google_event

        if content.get('nextPageToken', False):
            google_events_dict.update(self.get_event_dict(cr, uid, token, content['nextPageToken'], context=context))
        return google_events_dict

    def update_to_google(self, cr, uid, oe_event, google_event, context):
        calendar_event = self.pool['calendar.event']
        gs_pool = self.pool['google.service']

        url = "/calendar/v3/calendars/%s/events/%s?fields=%s&access_token=%s" % ('primary', google_event['id'], 'id,updated', self.get_token(cr, uid, context))
        headers = {'Content-type': 'application/json', 'Accept': 'text/plain'}
        data = self.generate_data(cr, uid, oe_event, context)
        data['sequence'] = google_event.get('sequence', 0)
        data_json = simplejson.dumps(data)

        content = gs_pool._do_request(cr, uid, url, data_json, headers, type='PATCH', context=context)

        update_date = datetime.strptime(content['updated'], "%Y-%m-%dT%H:%M:%S.%fz")
        calendar_event.write(cr, uid, [oe_event.id], {'oe_update_date': update_date})

        if context['curr_attendee']:
            self.pool['calendar.attendee'].write(cr, uid, [context['curr_attendee']], {'oe_synchro_date': update_date}, context)

    def update_an_event(self, cr, uid, event, context=None):
        gs_pool = self.pool['google.service']

        data = self.generate_data(cr, uid, event, context=context)

        url = "/calendar/v3/calendars/%s/events/%s" % ('primary', event.google_internal_event_id)
        headers = {}
        data['access_token'] = self.get_token(cr, uid, context)

        response = gs_pool._do_request(cr, uid, url, data, headers, type='GET', context=context)
        #TO_CHECK : , if http fail, no event, do DELETE ?
        return response

    def update_recurrent_event_exclu(self, cr, uid, instance_id, event_ori_google_id, event_new, context=None):
        gs_pool = self.pool['google.service']

        data = self.generate_data(cr, uid, event_new, context=context)

        data['recurringEventId'] = event_ori_google_id
        data['originalStartTime'] = event_new.recurrent_id_date

        url = "/calendar/v3/calendars/%s/events/%s?access_token=%s" % ('primary', instance_id, self.get_token(cr, uid, context))
        headers = {'Content-type': 'application/json'}

        data['sequence'] = self.get_sequence(cr, uid, instance_id, context)

        data_json = simplejson.dumps(data)
        return gs_pool._do_request(cr, uid, url, data_json, headers, type='PUT', context=context)

    def update_from_google(self, cr, uid, event, single_event_dict, type, context):
        if context is None:
            context = []

        calendar_event = self.pool['calendar.event']
        res_partner_obj = self.pool['res.partner']
        calendar_attendee_obj = self.pool['calendar.attendee']
        user_obj = self.pool['res.users']
        myPartnerID = user_obj.browse(cr, uid, uid, context).partner_id.id
        attendee_record = []
        partner_record = [(4, myPartnerID)]
        result = {}

        if single_event_dict.get('attendees', False):
            for google_attendee in single_event_dict['attendees']:
                if type == "write":
                    for oe_attendee in event['attendee_ids']:
                        if oe_attendee.email == google_attendee['email']:
                            calendar_attendee_obj.write(cr, uid, [oe_attendee.id], {'state': google_attendee['responseStatus']}, context=context)
                            google_attendee['found'] = True
                            continue

                if google_attendee.get('found', False):
                    continue
                if self.get_need_synchro_attendee(cr, uid, context=context):
                    attendee_id = res_partner_obj.search(cr, uid, [('email', '=', google_attendee['email'])], context=context)
                    if not attendee_id:
                        attendee_id = [res_partner_obj.create(cr, uid, {'email': google_attendee['email'], 'customer': False, 'name': google_attendee.get("displayName", False) or google_attendee['email']}, context=context)]
                    attendee = res_partner_obj.read(cr, uid, attendee_id[0], ['email'], context=context)
                    partner_record.append((4, attendee.get('id')))
                    attendee['partner_id'] = attendee.pop('id')
                    attendee['state'] = google_attendee['responseStatus']
                    attendee_record.append((0, 0, attendee))

        UTC = pytz.timezone('UTC')
        if single_event_dict.get('start') and single_event_dict.get('end'):  # If not cancelled
            if single_event_dict['start'].get('dateTime', False) and single_event_dict['end'].get('dateTime', False):
                date = parser.parse(single_event_dict['start']['dateTime'])
                date_deadline = parser.parse(single_event_dict['end']['dateTime'])
                delta = date_deadline.astimezone(UTC) - date.astimezone(UTC)
                date = str(date.astimezone(UTC))[:-6]
                date_deadline = str(date_deadline.astimezone(UTC))[:-6]
                allday = False
            else:
                date = (single_event_dict['start']['date'] + ' 00:00:00')
                date_deadline = (single_event_dict['end']['date'] + ' 00:00:00')
                d_start = datetime.strptime(date, "%Y-%m-%d %H:%M:%S")
                d_end = datetime.strptime(date_deadline, "%Y-%m-%d %H:%M:%S")
                delta = (d_end - d_start)
                allday = True

            result['duration'] = (delta.seconds / 60) / 60.0 + delta.days * 24
            update_date = datetime.strptime(single_event_dict['updated'], "%Y-%m-%dT%H:%M:%S.%fz")
            result.update({
                'date': date,
                'date_deadline': date_deadline,
                'allday': allday
            })
        result.update({
            'attendee_ids': attendee_record,
            'partner_ids': list(set(partner_record)),

            'name': single_event_dict.get('summary', 'Event'),
            'description': single_event_dict.get('description', False),
            'location': single_event_dict.get('location', False),
            'class': single_event_dict.get('visibility', 'public'),
            'oe_update_date': update_date,
            # 'google_internal_event_id': single_event_dict.get('id',False),
        })

        if single_event_dict.get("recurrence", False):
            rrule = [rule for rule in single_event_dict["recurrence"] if rule.startswith("RRULE:")][0][6:]
            result['rrule'] = rrule

        if type == "write":
            res = calendar_event.write(cr, uid, event['id'], result, context=context)
        elif type == "copy":
            result['recurrence'] = True
            res = calendar_event.write(cr, uid, [event['id']], result, context=context)

        elif type == "create":
            res = calendar_event.create(cr, uid, result, context=context)

        if context['curr_attendee']:
            self.pool['calendar.attendee'].write(cr, uid, [context['curr_attendee']], {'oe_synchro_date': update_date, 'google_internal_event_id': single_event_dict.get('id', False)}, context)
        return res

    def synchronize_events(self, cr, uid, ids, context=None):
        # Create all new events from OpenERP into Gmail, if that is not recurrent event
        self.create_new_events(cr, uid, context=context)
        self.bind_recurring_events_to_google(cr, uid, context)
        res = self.update_events(cr, uid, context)

        return {
            "status": res and "need_refresh" or "no_new_event_form_google",
            "url": ''
        }

    def create_new_events(self, cr, uid, context=None):
        ev_obj = self.pool['calendar.event']
        att_obj = self.pool['calendar.attendee']
        user_obj = self.pool['res.users']
        myPartnerID = user_obj.browse(cr, uid, uid, context=context).partner_id.id

        context_norecurrent = context.copy()
        context_norecurrent['virtual_id'] = False

        my_att_ids = att_obj.search(cr, uid, [('partner_id', '=', myPartnerID),
                                    ('google_internal_event_id', '=', False),
                                    '|',
                                    ('event_id.date_deadline', '>', self.get_start_time_to_synchro(cr, uid, context).strftime("%Y-%m-%d %H:%M:%S")),
                                    ('event_id.end_date', '>', self.get_start_time_to_synchro(cr, uid, context).strftime("%Y-%m-%d %H:%M:%S")),
                                    ], context=context_norecurrent)

        for att in att_obj.browse(cr, uid, my_att_ids, context=context):
            if not att.event_id.recurrent_id or att.event_id.recurrent_id == 0:
                response = self.create_an_event(cr, uid, att.event_id, context=context)
                update_date = datetime.strptime(response['updated'], "%Y-%m-%dT%H:%M:%S.%fz")
                ev_obj.write(cr, uid, att.event_id.id, {'oe_update_date': update_date})
                att_obj.write(cr, uid, [att.id], {'google_internal_event_id': response['id'], 'oe_synchro_date': update_date})
                cr.commit()

    def bind_recurring_events_to_google(self, cr, uid, context):
        ev_obj = self.pool['calendar.event']
        att_obj = self.pool['calendar.attendee']
        user_obj = self.pool['res.users']
        myPartnerID = user_obj.browse(cr, uid, uid, context=context).partner_id.id

        context_norecurrent = context.copy()
        context_norecurrent['virtual_id'] = False
        context_norecurrent['active_test'] = False

        my_att_ids = att_obj.search(cr, uid, [('partner_id', '=', myPartnerID), ('google_internal_event_id', '=', False)], context=context_norecurrent)

        for att in att_obj.browse(cr, uid, my_att_ids, context=context):
            if att.event_id.recurrent_id and att.event_id.recurrent_id > 0:
                new_google_internal_event_id = False
                source_event_record = ev_obj.browse(cr, uid, att.event_id.recurrent_id, context)
                source_attendee_record_id = att_obj.search(cr, uid, [('partner_id', '=', myPartnerID), ('event_id', '=', source_event_record.id)], context=context)
                source_attendee_record = att_obj.browse(cr, uid, source_attendee_record_id, context)[0]

                if att.event_id.recurrent_id_date and source_event_record.allday and source_attendee_record.google_internal_event_id:
                    new_google_internal_event_id = source_attendee_record.google_internal_event_id + '_' + att.event_id.recurrent_id_date.split(' ')[0].replace('-', '')
                elif att.event_id.recurrent_id_date and source_attendee_record.google_internal_event_id:
                    new_google_internal_event_id = source_attendee_record.google_internal_event_id + '_' + att.event_id.recurrent_id_date.replace('-', '').replace(' ', 'T').replace(':', '') + 'Z'

                if new_google_internal_event_id:
                    #TODO WARNING, NEED TO CHECK THAT EVENT and ALL instance NOT DELETE IN GMAIL BEFORE !
                    self.update_recurrent_event_exclu(cr, uid, new_google_internal_event_id, source_attendee_record.google_internal_event_id, att.event_id, context=context)
                    att_obj.write(cr, uid, [att.id], {'google_internal_event_id': new_google_internal_event_id}, context=context)
                    cr.commit()

    def update_events(self, cr, uid, context=None):
        if context is None:
            context = {}

        calendar_event = self.pool['calendar.event']
        user_obj = self.pool['res.users']
        att_obj = self.pool['calendar.attendee']
        myPartnerID = user_obj.browse(cr, uid, uid, context=context).partner_id.id

        context_novirtual = context.copy()
        context_novirtual['virtual_id'] = False
        context_novirtual['active_test'] = False

        all_event_from_google = self.get_event_dict(cr, uid, context=context)

        # Select all events from OpenERP which have been already synchronized in gmail
        my_att_ids = att_obj.search(cr, uid, [('partner_id', '=', myPartnerID),
                                    ('google_internal_event_id', '!=', False),
                                    '|',
                                    ('event_id.date_deadline', '>', self.get_start_time_to_synchro(cr, uid, context).strftime("%Y-%m-%d %H:%M:%S")),
                                    ('event_id.end_date', '>', self.get_start_time_to_synchro(cr, uid, context).strftime("%Y-%m-%d %H:%M:%S")),
                                    ], context=context_novirtual)
        event_to_synchronize = {}
        for att in att_obj.browse(cr, uid, my_att_ids, context=context):
            event = att.event_id

            base_event_id = att.google_internal_event_id.split('_')[0]

            if base_event_id not in event_to_synchronize:
                event_to_synchronize[base_event_id] = {}

            if att.google_internal_event_id not in event_to_synchronize[base_event_id]:
                event_to_synchronize[base_event_id][att.google_internal_event_id] = SyncEvent()

            ev_to_sync = event_to_synchronize[base_event_id][att.google_internal_event_id]

            ev_to_sync.OE.attendee_id = att.id
            ev_to_sync.OE.event = event
            ev_to_sync.OE.found = True
            ev_to_sync.OE.event_id = event.id
            ev_to_sync.OE.isRecurrence = event.recurrency
            ev_to_sync.OE.isInstance = bool(event.recurrent_id and event.recurrent_id > 0)
            ev_to_sync.OE.update = event.oe_update_date
            ev_to_sync.OE.status = event.active
            ev_to_sync.OE.synchro = att.oe_synchro_date

        for event in all_event_from_google.values():
            event_id = event.get('id')
            base_event_id = event_id.split('_')[0]

            if base_event_id not in event_to_synchronize:
                event_to_synchronize[base_event_id] = {}

            if event_id not in event_to_synchronize[base_event_id]:
                event_to_synchronize[base_event_id][event_id] = SyncEvent()

            ev_to_sync = event_to_synchronize[base_event_id][event_id]

            ev_to_sync.GG.event = event
            ev_to_sync.GG.found = True
            ev_to_sync.GG.isRecurrence = bool(event.get('recurrence', ''))
            ev_to_sync.GG.isInstance = bool(event.get('recurringEventId', 0))
            ev_to_sync.GG.update = event.get('updated', None)  # if deleted, no date without browse event
            if ev_to_sync.GG.update:
                ev_to_sync.GG.update = ev_to_sync.GG.update.replace('T', ' ').replace('Z', '')
            ev_to_sync.GG.status = (event.get('status') != 'cancelled')

        ######################
        #   PRE-PROCESSING   #
        ######################
        for base_event in event_to_synchronize:
            for current_event in event_to_synchronize[base_event]:
                event_to_synchronize[base_event][current_event].compute_OP()
            #print event_to_synchronize[base_event]

        ######################
        #      DO ACTION     #
        ######################
        for base_event in event_to_synchronize:
            event_to_synchronize[base_event] = sorted(event_to_synchronize[base_event].iteritems(), key=operator.itemgetter(0))
            for current_event in event_to_synchronize[base_event]:
                cr.commit()
                event = current_event[1]  # event is an Sync Event !
                actToDo = event.OP
                actSrc = event.OP.src

                context['curr_attendee'] = event.OE.attendee_id

                if isinstance(actToDo, NothingToDo):
                    continue
                elif isinstance(actToDo, Create):
                    context_tmp = context.copy()
                    context_tmp['NewMeeting'] = True
                    if actSrc == 'GG':
                        res = self.update_from_google(cr, uid, False, event.GG.event, "create", context=context_tmp)
                        event.OE.event_id = res
                        meeting = calendar_event.browse(cr, uid, res, context=context)
                        attendee_record_id = att_obj.search(cr, uid, [('partner_id', '=', myPartnerID), ('event_id', '=', res)], context=context)
                        self.pool['calendar.attendee'].write(cr, uid, attendee_record_id, {'oe_synchro_date': meeting.oe_update_date, 'google_internal_event_id': event.GG.event['id']}, context=context_tmp)
                    elif actSrc == 'OE':
                        raise "Should be never here, creation for OE is done before update !"
                    #TODO Add to batch
                elif isinstance(actToDo, Update):
                    if actSrc == 'GG':
                        self.update_from_google(cr, uid, event.OE.event, event.GG.event, 'write', context)
                    elif actSrc == 'OE':
                        self.update_to_google(cr, uid, event.OE.event, event.GG.event, context)
                elif isinstance(actToDo, Exclude):
                    if actSrc == 'OE':
                        self.delete_an_event(cr, uid, current_event[0], context=context)
                    elif actSrc == 'GG':
                            new_google_event_id = event.GG.event['id'].split('_')[1]
                            if 'T' in new_google_event_id:
                                new_google_event_id = new_google_event_id.replace('T', '')[:-1]
                            else:
                                new_google_event_id = new_google_event_id + "000000"

                                if event.GG.status:
                                    parent_event = {}
                                    parent_event['id'] = "%s-%s" % (event_to_synchronize[base_event][0][1].OE.event_id, new_google_event_id)
                                    res = self.update_from_google(cr, uid, parent_event, event.GG.event, "copy", context)
                                else:
                                    if event_to_synchronize[base_event][0][1].OE.event_id:
                                        parent_oe_id = event_to_synchronize[base_event][0][1].OE.event_id
                                        calendar_event.unlink(cr, uid, "%s-%s" % (parent_oe_id, new_google_event_id), unlink_level=1, context=context)

                elif isinstance(actToDo, Delete):
                    if actSrc == 'GG':
                        self.delete_an_event(cr, uid, current_event[0], context=context)
                    elif actSrc == 'OE':
                        calendar_event.unlink(cr, uid, event.OE.event_id, unlink_level=0, context=context)
        return True

    def check_and_sync(self, cr, uid, oe_event, google_event, context):
        if datetime.strptime(oe_event.oe_update_date, "%Y-%m-%d %H:%M:%S.%f") > datetime.strptime(google_event['updated'], "%Y-%m-%dT%H:%M:%S.%fz"):
            self.update_to_google(cr, uid, oe_event, google_event, context)
        elif datetime.strptime(oe_event.oe_update_date, "%Y-%m-%d %H:%M:%S.%f") < datetime.strptime(google_event['updated'], "%Y-%m-%dT%H:%M:%S.%fz"):
            self.update_from_google(cr, uid, oe_event, google_event, 'write', context)

    def get_sequence(self, cr, uid, instance_id, context=None):
        gs_pool = self.pool['google.service']

        params = {
            'fields': 'sequence',
            'access_token': self.get_token(cr, uid, context)
        }

        headers = {'Content-type': 'application/json'}

        url = "/calendar/v3/calendars/%s/events/%s" % ('primary', instance_id)

        content = gs_pool._do_request(cr, uid, url, params, headers, type='GET', context=context)
        return content.get('sequence', 0)
#################################
##  MANAGE CONNEXION TO GMAIL  ##
#################################

    def get_token(self, cr, uid, context=None):
        current_user = self.pool['res.users'].browse(cr, uid, uid, context=context)

        if datetime.strptime(current_user.google_calendar_token_validity.split('.')[0], "%Y-%m-%d %H:%M:%S") < (datetime.now() + timedelta(minutes=1)):
            self.do_refresh_token(cr, uid, context=context)
            current_user.refresh()

        return current_user.google_calendar_token

    def do_refresh_token(self, cr, uid, context=None):
        current_user = self.pool['res.users'].browse(cr, uid, uid, context=context)
        gs_pool = self.pool['google.service']

        all_token = gs_pool._refresh_google_token_json(cr, uid, current_user.google_calendar_rtoken, self.STR_SERVICE, context=context)

        vals = {}
        vals['google_%s_token_validity' % self.STR_SERVICE] = datetime.now() + timedelta(seconds=all_token.get('expires_in'))
        vals['google_%s_token' % self.STR_SERVICE] = all_token.get('access_token')

        self.pool['res.users'].write(cr, SUPERUSER_ID, uid, vals, context=context)

    def need_authorize(self, cr, uid, context=None):
        current_user = self.pool['res.users'].browse(cr, uid, uid, context=context)
        return current_user.google_calendar_rtoken is False

    def get_calendar_scope(self, RO=False):
        readonly = RO and '.readonly' or ''
        return 'https://www.googleapis.com/auth/calendar%s' % (readonly)

    def authorize_google_uri(self, cr, uid, from_url='http://www.openerp.com', context=None):
        url = self.pool['google.service']._get_authorize_uri(cr, uid, from_url, self.STR_SERVICE, scope=self.get_calendar_scope(), context=context)
        return url

    def can_authorize_google(self, cr, uid, context=None):
        return self.pool['res.users'].has_group(cr, uid, 'base.group_erp_manager')

    def set_all_tokens(self, cr, uid, authorization_code, context=None):
        gs_pool = self.pool['google.service']
        all_token = gs_pool._get_google_token_json(cr, uid, authorization_code, self.STR_SERVICE, context=context)

        vals = {}
        vals['google_%s_rtoken' % self.STR_SERVICE] = all_token.get('refresh_token')
        vals['google_%s_token_validity' % self.STR_SERVICE] = datetime.now() + timedelta(seconds=all_token.get('expires_in'))
        vals['google_%s_token' % self.STR_SERVICE] = all_token.get('access_token')
        self.pool['res.users'].write(cr, SUPERUSER_ID, uid, vals, context=context)

    def get_start_time_to_synchro(self, cr, uid, context=None):
        # WILL BE AN IR CONFIG PARAMETER - beginning from SAAS4
        number_of_week = 13
        return datetime.now() - timedelta(weeks=number_of_week)

    def get_need_synchro_attendee(self, cr, uid, context=None):
        # WILL BE AN IR CONFIG PARAMETER - beginning from SAAS4
        return True


class res_users(osv.Model):
    _inherit = 'res.users'

    _columns = {
        'google_calendar_rtoken': fields.char('Refresh Token'),
        'google_calendar_token': fields.char('User token'),
        'google_calendar_token_validity': fields.datetime('Token Validity'),
    }


class calendar_event(osv.Model):
    _inherit = "calendar.event"

    def write(self, cr, uid, ids, vals, context=None):
        if context is None:
            context = {}
        sync_fields = set(['name', 'description', 'date', 'date_closed', 'date_deadline', 'attendee_ids', 'location', 'class'])
        if (set(vals.keys()) & sync_fields) and 'oe_update_date' not in vals.keys() and 'NewMeeting' not in context:
            vals['oe_update_date'] = datetime.now()

        return super(calendar_event, self).write(cr, uid, ids, vals, context=context)

    def copy(self, cr, uid, id, default=None, context=None):
        default = default or {}
        default['attendee_ids'] = False
        if default.get('write_type', False):
            del default['write_type']
        elif default.get('recurrent_id', False):
            default['oe_update_date'] = datetime.now()
        else:
            default['oe_update_date'] = False
        return super(calendar_event, self).copy(cr, uid, id, default, context)

    _columns = {
        'oe_update_date': fields.datetime('OpenERP Update Date'),
    }


class calendar_attendee(osv.Model):
    _inherit = 'calendar.attendee'

    _columns = {
        'google_internal_event_id': fields.char('Google Calendar Event Id', size=256),
        'oe_synchro_date': fields.datetime('OpenERP Synchro Date'),
    }
    _sql_constraints = [('google_id_uniq', 'unique(google_internal_event_id,partner_id,event_id)', 'Google ID should be unique!')]

    def write(self, cr, uid, ids, vals, context=None):
        if context is None:
            context = {}

        for id in ids:
            ref = vals.get('event_id', self.browse(cr, uid, id, context=context).event_id.id)

            # If attendees are updated, we need to specify that next synchro need an action
            # Except if it come from an update_from_google
            if not context.get('curr_attendee', False) and not context.get('NewMeeting', False):
                self.pool['calendar.event'].write(cr, uid, ref, {'oe_update_date': datetime.now()}, context)
        return super(calendar_attendee, self).write(cr, uid, ids, vals, context=context)
