# -*- coding: utf-8 -*-
##############################################################################
#
#    OpenERP, Open Source Management Solution
#    Copyright (C) 2009-today 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 base64
import datetime
import dateutil
import email
import logging
import pytz
import re
import socket
import time
import xmlrpclib
from email.message import Message

from openerp import tools
from openerp import SUPERUSER_ID
from openerp.addons.mail.mail_message import decode
from openerp.osv import fields, osv, orm
from openerp.osv.orm import browse_record, browse_null
from openerp.tools.safe_eval import safe_eval as eval
from openerp.tools.translate import _

_logger = logging.getLogger(__name__)


mail_header_msgid_re = re.compile('<[^<>]+>')

def decode_header(message, header, separator=' '):
    return separator.join(map(decode, filter(None, message.get_all(header, []))))


class mail_thread(osv.AbstractModel):
    ''' mail_thread model is meant to be inherited by any model that needs to
        act as a discussion topic on which messages can be attached. Public
        methods are prefixed with ``message_`` in order to avoid name
        collisions with methods of the models that will inherit from this class.

        ``mail.thread`` defines fields used to handle and display the
        communication history. ``mail.thread`` also manages followers of
        inheriting classes. All features and expected behavior are managed
        by mail.thread. Widgets has been designed for the 7.0 and following
        versions of OpenERP.

        Inheriting classes are not required to implement any method, as the
        default implementation will work for any model. However it is common
        to override at least the ``message_new`` and ``message_update``
        methods (calling ``super``) to add model-specific behavior at
        creation and update of a thread when processing incoming emails.

        Options:
            - _mail_flat_thread: if set to True, all messages without parent_id
                are automatically attached to the first message posted on the
                ressource. If set to False, the display of Chatter is done using
                threads, and no parent_id is automatically set.
    '''
    _name = 'mail.thread'
    _description = 'Email Thread'
    _mail_flat_thread = True

    # Automatic logging system if mail installed
    # _track = {
    #   'field': {
    #       'module.subtype_xml': lambda self, cr, uid, obj, context=None: obj[state] == done,
    #       'module.subtype_xml2': lambda self, cr, uid, obj, context=None: obj[state] != done,
    #   },
    #   'field2': {
    #       ...
    #   },
    # }
    # where
    #   :param string field: field name
    #   :param module.subtype_xml: xml_id of a mail.message.subtype (i.e. mail.mt_comment)
    #   :param obj: is a browse_record
    #   :param function lambda: returns whether the tracking should record using this subtype
    _track = {}

    def _get_message_data(self, cr, uid, ids, name, args, context=None):
        """ Computes:
            - message_unread: has uid unread message for the document
            - message_summary: html snippet summarizing the Chatter for kanban views """
        res = dict((id, dict(message_unread=False, message_unread_count=0, message_summary=' ')) for id in ids)
        user_pid = self.pool.get('res.users').read(cr, uid, uid, ['partner_id'], context=context)['partner_id'][0]

        # search for unread messages, directly in SQL to improve performances
        cr.execute("""  SELECT m.res_id FROM mail_message m
                        RIGHT JOIN mail_notification n
                        ON (n.message_id = m.id AND n.partner_id = %s AND (n.read = False or n.read IS NULL))
                        WHERE m.model = %s AND m.res_id in %s""",
                    (user_pid, self._name, tuple(ids),))
        for result in cr.fetchall():
            res[result[0]]['message_unread'] = True
            res[result[0]]['message_unread_count'] += 1

        for id in ids:
            if res[id]['message_unread_count']:
                title = res[id]['message_unread_count'] > 1 and _("You have %d unread messages") % res[id]['message_unread_count'] or _("You have one unread message")
                res[id]['message_summary'] = "<span class='oe_kanban_mail_new' title='%s'><span class='oe_e'>9</span> %d %s</span>" % (title, res[id].pop('message_unread_count'), _("New"))
            res[id].pop('message_unread_count', None)
        return res

    def _get_subscription_data(self, cr, uid, ids, name, args, context=None):
        """ Computes:
            - message_subtype_data: data about document subtypes: which are
                available, which are followed if any """
        res = dict((id, dict(message_subtype_data='')) for id in ids)
        user_pid = self.pool.get('res.users').read(cr, uid, uid, ['partner_id'], context=context)['partner_id'][0]

        # find current model subtypes, add them to a dictionary
        subtype_obj = self.pool.get('mail.message.subtype')
        subtype_ids = subtype_obj.search(cr, uid, ['|', ('res_model', '=', self._name), ('res_model', '=', False)], context=context)
        subtype_dict = dict((subtype.name, dict(default=subtype.default, followed=False, id=subtype.id)) for subtype in subtype_obj.browse(cr, uid, subtype_ids, context=context))
        for id in ids:
            res[id]['message_subtype_data'] = subtype_dict.copy()

        # find the document followers, update the data
        fol_obj = self.pool.get('mail.followers')
        fol_ids = fol_obj.search(cr, uid, [
            ('partner_id', '=', user_pid),
            ('res_id', 'in', ids),
            ('res_model', '=', self._name),
        ], context=context)
        for fol in fol_obj.browse(cr, uid, fol_ids, context=context):
            thread_subtype_dict = res[fol.res_id]['message_subtype_data']
            for subtype in fol.subtype_ids:
                thread_subtype_dict[subtype.name]['followed'] = True
            res[fol.res_id]['message_subtype_data'] = thread_subtype_dict

        return res

    def _search_message_unread(self, cr, uid, obj=None, name=None, domain=None, context=None):
        return [('message_ids.to_read', '=', True)]

    def _get_followers(self, cr, uid, ids, name, arg, context=None):
        fol_obj = self.pool.get('mail.followers')
        fol_ids = fol_obj.search(cr, SUPERUSER_ID, [('res_model', '=', self._name), ('res_id', 'in', ids)])
        res = dict((id, dict(message_follower_ids=[], message_is_follower=False)) for id in ids)
        user_pid = self.pool.get('res.users').read(cr, uid, uid, ['partner_id'], context=context)['partner_id'][0]
        for fol in fol_obj.browse(cr, SUPERUSER_ID, fol_ids):
            res[fol.res_id]['message_follower_ids'].append(fol.partner_id.id)
            if fol.partner_id.id == user_pid:
                res[fol.res_id]['message_is_follower'] = True
        return res

    def _set_followers(self, cr, uid, id, name, value, arg, context=None):
        if not value:
            return
        partner_obj = self.pool.get('res.partner')
        fol_obj = self.pool.get('mail.followers')

        # read the old set of followers, and determine the new set of followers
        fol_ids = fol_obj.search(cr, SUPERUSER_ID, [('res_model', '=', self._name), ('res_id', '=', id)])
        old = set(fol.partner_id.id for fol in fol_obj.browse(cr, SUPERUSER_ID, fol_ids))
        new = set(old)

        for command in value or []:
            if isinstance(command, (int, long)):
                new.add(command)
            elif command[0] == 0:
                new.add(partner_obj.create(cr, uid, command[2], context=context))
            elif command[0] == 1:
                partner_obj.write(cr, uid, [command[1]], command[2], context=context)
                new.add(command[1])
            elif command[0] == 2:
                partner_obj.unlink(cr, uid, [command[1]], context=context)
                new.discard(command[1])
            elif command[0] == 3:
                new.discard(command[1])
            elif command[0] == 4:
                new.add(command[1])
            elif command[0] == 5:
                new.clear()
            elif command[0] == 6:
                new = set(command[2])

        # remove partners that are no longer followers
        self.message_unsubscribe(cr, uid, [id], list(old-new), context=context)
        # add new followers
        self.message_subscribe(cr, uid, [id], list(new-old), context=context)

    def _search_followers(self, cr, uid, obj, name, args, context):
        fol_obj = self.pool.get('mail.followers')
        res = []
        for field, operator, value in args:
            assert field == name
            fol_ids = fol_obj.search(cr, SUPERUSER_ID, [('res_model', '=', self._name), ('partner_id', operator, value)])
            res_ids = [fol.res_id for fol in fol_obj.browse(cr, SUPERUSER_ID, fol_ids)]
            res.append(('id', 'in', res_ids))
        return res

    _columns = {
        'message_is_follower': fields.function(_get_followers,
            type='boolean', string='Is a Follower', multi='_get_followers,'),
        'message_follower_ids': fields.function(_get_followers, fnct_inv=_set_followers,
                fnct_search=_search_followers, type='many2many', priority=-10,
                obj='res.partner', string='Followers', multi='_get_followers'),
        'message_ids': fields.one2many('mail.message', 'res_id',
            domain=lambda self: [('model', '=', self._name)],
            auto_join=True,
            string='Messages',
            help="Messages and communication history"),
        'message_unread': fields.function(_get_message_data,
            fnct_search=_search_message_unread, multi="_get_message_data",
            type='boolean', string='Unread Messages',
            help="If checked new messages require your attention."),
        'message_summary': fields.function(_get_message_data, method=True,
            type='text', string='Summary', multi="_get_message_data",
            help="Holds the Chatter summary (number of messages, ...). "\
                 "This summary is directly in html format in order to "\
                 "be inserted in kanban views."),
    }

    #------------------------------------------------------
    # CRUD overrides for automatic subscription and logging
    #------------------------------------------------------

    def create(self, cr, uid, values, context=None):
        """ Chatter override :
            - subscribe uid
            - subscribe followers of parent
            - log a creation message
        """
        if context is None:
            context = {}

        # subscribe uid unless asked not to
        if not context.get('mail_create_nosubscribe'):
            pid = self.pool['res.users'].browse(cr, SUPERUSER_ID, uid).partner_id.id
            message_follower_ids = values.get('message_follower_ids') or []  # webclient can send None or False
            message_follower_ids.append([4, pid])
            values['message_follower_ids'] = message_follower_ids
            # add operation to ignore access rule checking for subscription
            context_operation = dict(context, operation='create')
        else:
            context_operation = context
        thread_id = super(mail_thread, self).create(cr, uid, values, context=context_operation)

        # automatic logging unless asked not to (mainly for various testing purpose)
        if not context.get('mail_create_nolog'):
            ir_model_pool = self.pool['ir.model']
            ids = ir_model_pool.search(cr, uid, [('model', '=', self._name)], context=context)
            name = ir_model_pool.read(cr, uid, ids, ['name'], context=context)[0]['name']
            self.message_post(cr, uid, thread_id, body=_('%s created') % name, context=context)

        # auto_subscribe: take values and defaults into account
        create_values = dict(values)
        for key, val in context.iteritems():
            if key.startswith('default_') and key[8:] not in create_values:
                create_values[key[8:]] = val
        self.message_auto_subscribe(cr, uid, [thread_id], create_values.keys(), context=context, values=create_values)

        # track values
        track_ctx = dict(context)
        if 'lang' not in track_ctx:
            track_ctx['lang'] = self.pool.get('res.users').browse(cr, uid, uid, context=context).lang
        if not context.get('mail_notrack'):
            tracked_fields = self._get_tracked_fields(cr, uid, values.keys(), context=track_ctx)
            if tracked_fields:
                initial_values = {thread_id: dict((item, False) for item in tracked_fields)}
                self.message_track(cr, uid, [thread_id], tracked_fields, initial_values, context=track_ctx)
        return thread_id

    def write(self, cr, uid, ids, values, context=None):
        if context is None:
            context = {}
        if isinstance(ids, (int, long)):
            ids = [ids]

        # Track initial values of tracked fields
        track_ctx = dict(context)
        if 'lang' not in track_ctx:
            track_ctx['lang'] = self.pool.get('res.users').browse(cr, uid, uid, context=context).lang
        tracked_fields = self._get_tracked_fields(cr, uid, values.keys(), context=track_ctx)
        if tracked_fields:
            initial = self.read(cr, uid, ids, tracked_fields.keys(), context=track_ctx)
            initial_values = dict((item['id'], item) for item in initial)

        # Perform write, update followers
        result = super(mail_thread, self).write(cr, uid, ids, values, context=context)
        self.message_auto_subscribe(cr, uid, ids, values.keys(), context=context, values=values)

        if not context.get('mail_notrack'):
            # Perform the tracking
            tracked_fields = self._get_tracked_fields(cr, uid, values.keys(), context=track_ctx)
        else:
            tracked_fields = None
        if tracked_fields:
            self.message_track(cr, uid, ids, tracked_fields, initial_values, context=track_ctx)
        return result

    def unlink(self, cr, uid, ids, context=None):
        """ Override unlink to delete messages and followers. This cannot be
            cascaded, because link is done through (res_model, res_id). """
        msg_obj = self.pool.get('mail.message')
        fol_obj = self.pool.get('mail.followers')
        # delete messages and notifications
        msg_ids = msg_obj.search(cr, uid, [('model', '=', self._name), ('res_id', 'in', ids)], context=context)
        msg_obj.unlink(cr, uid, msg_ids, context=context)
        # delete
        res = super(mail_thread, self).unlink(cr, uid, ids, context=context)
        # delete followers
        fol_ids = fol_obj.search(cr, SUPERUSER_ID, [('res_model', '=', self._name), ('res_id', 'in', ids)], context=context)
        fol_obj.unlink(cr, SUPERUSER_ID, fol_ids, context=context)
        return res

    def copy_data(self, cr, uid, id, default=None, context=None):
        # avoid tracking multiple temporary changes during copy
        context = dict(context or {}, mail_notrack=True)

        default = default or {}
        default['message_ids'] = []
        default['message_follower_ids'] = []
        return super(mail_thread, self).copy_data(cr, uid, id, default=default, context=context)

    #------------------------------------------------------
    # Automatically log tracked fields
    #------------------------------------------------------

    def _get_tracked_fields(self, cr, uid, updated_fields, context=None):
        """ Return a structure of tracked fields for the current model.
            :param list updated_fields: modified field names
            :return list: a list of (field_name, column_info obj), containing
                always tracked fields and modified on_change fields
        """
        lst = []
        for name, column_info in self._all_columns.items():
            visibility = getattr(column_info.column, 'track_visibility', False)
            if visibility == 'always' or (visibility == 'onchange' and name in updated_fields) or name in self._track:
                lst.append(name)
        if not lst:
            return lst
        return self.fields_get(cr, uid, lst, context=context)

    def message_track(self, cr, uid, ids, tracked_fields, initial_values, context=None):

        def convert_for_display(value, col_info):
            if not value and col_info['type'] == 'boolean':
                return 'False'
            if not value:
                return ''
            if col_info['type'] == 'many2one':
                return value[1]
            if col_info['type'] == 'selection':
                return dict(col_info['selection'])[value]
            return value

        def format_message(message_description, tracked_values):
            message = ''
            if message_description:
                message = '<span>%s</span>' % message_description
            for name, change in tracked_values.items():
                message += '<div> &nbsp; &nbsp; &bull; <b>%s</b>: ' % change.get('col_info')
                if change.get('old_value'):
                    message += '%s &rarr; ' % change.get('old_value')
                message += '%s</div>' % change.get('new_value')
            return message

        if not tracked_fields:
            return True

        for record in self.read(cr, uid, ids, tracked_fields.keys(), context=context):
            initial = initial_values[record['id']]
            changes = []
            tracked_values = {}

            # generate tracked_values data structure: {'col_name': {col_info, new_value, old_value}}
            for col_name, col_info in tracked_fields.items():
                if record[col_name] == initial[col_name] and getattr(self._all_columns[col_name].column, 'track_visibility', None) == 'always':
                    tracked_values[col_name] = dict(col_info=col_info['string'],
                                                        new_value=convert_for_display(record[col_name], col_info))
                elif record[col_name] != initial[col_name]:
                    if getattr(self._all_columns[col_name].column, 'track_visibility', None) in ['always', 'onchange']:
                        tracked_values[col_name] = dict(col_info=col_info['string'],
                                                            old_value=convert_for_display(initial[col_name], col_info),
                                                            new_value=convert_for_display(record[col_name], col_info))
                    if col_name in tracked_fields:
                        changes.append(col_name)
            if not changes:
                continue

            # find subtypes and post messages or log if no subtype found
            subtypes = []
            for field, track_info in self._track.items():
                if field not in changes:
                    continue
                for subtype, method in track_info.items():
                    if method(self, cr, uid, record, context):
                        subtypes.append(subtype)

            posted = False
            for subtype in subtypes:
                try:
                    subtype_rec = self.pool.get('ir.model.data').get_object(cr, uid, subtype.split('.')[0], subtype.split('.')[1], context=context)
                except ValueError, e:
                    _logger.debug('subtype %s not found, giving error "%s"' % (subtype, e))
                    continue
                message = format_message(subtype_rec.description if subtype_rec.description else subtype_rec.name, tracked_values)
                self.message_post(cr, uid, record['id'], body=message, subtype=subtype, context=context)
                posted = True
            if not posted:
                message = format_message('', tracked_values)
                self.message_post(cr, uid, record['id'], body=message, context=context)
        return True

    #------------------------------------------------------
    # mail.message wrappers and tools
    #------------------------------------------------------

    def _needaction_domain_get(self, cr, uid, context=None):
        if self._needaction:
            return [('message_unread', '=', True)]
        return []

    def _garbage_collect_attachments(self, cr, uid, context=None):
        """ Garbage collect lost mail attachments. Those are attachments
            - linked to res_model 'mail.compose.message', the composer wizard
            - with res_id 0, because they were created outside of an existing
                wizard (typically user input through Chatter or reports
                created on-the-fly by the templates)
            - unused since at least one day (create_date and write_date)
        """
        limit_date = datetime.datetime.utcnow() - datetime.timedelta(days=1)
        limit_date_str = datetime.datetime.strftime(limit_date, tools.DEFAULT_SERVER_DATETIME_FORMAT)
        ir_attachment_obj = self.pool.get('ir.attachment')
        attach_ids = ir_attachment_obj.search(cr, uid, [
                            ('res_model', '=', 'mail.compose.message'),
                            ('res_id', '=', 0),
                            ('create_date', '<', limit_date_str),
                            ('write_date', '<', limit_date_str),
                            ], context=context)
        ir_attachment_obj.unlink(cr, uid, attach_ids, context=context)
        return True

    #------------------------------------------------------
    # Email specific
    #------------------------------------------------------

    def message_get_reply_to(self, cr, uid, ids, context=None):
        if not self._inherits.get('mail.alias'):
            return [False for id in ids]
        return ["%s@%s" % (record['alias_name'], record['alias_domain'])
                    if record.get('alias_domain') and record.get('alias_name')
                    else False
                    for record in self.read(cr, SUPERUSER_ID, ids, ['alias_name', 'alias_domain'], context=context)]

    #------------------------------------------------------
    # Mail gateway
    #------------------------------------------------------

    def message_capable_models(self, cr, uid, context=None):
        """ Used by the plugin addon, based for plugin_outlook and others. """
        ret_dict = {}
        for model_name in self.pool.obj_list():
            model = self.pool.get(model_name)
            if hasattr(model, "message_process") and hasattr(model, "message_post"):
                ret_dict[model_name] = model._description
        return ret_dict

    def _message_partner_id_by_email(self, cr, uid, email_address, context=None):
        """ Find a partner ID corresponding to the given email address """
        partner_obj = self.pool['res.partner']
        # Escape special SQL characters in email_address to avoid invalid matches
        email_address = (email_address.replace('\\', '\\\\')
                                      .replace('%', '\\%')
                                      .replace('_', '\\_'))
        # exact, case-insensitive match
        result = partner_obj.search(cr, uid, [('email', '=ilike', email_address), ('user_ids', '!=', False)], limit=1, context=context)
        if not result:
            result = partner_obj.search(cr, uid, [('email', '=ilike', email_address)], limit=1, context=context)
        # if no match with addr-spec, attempt substring match within name-addr pair (See RFC5322, section 3.4)
        email_address = "<%s>" % email_address
        if not result:
            result = partner_obj.search(cr, uid, [('email', 'ilike', email_address), ('user_ids', '!=', False)], limit=1, context=context)
        if not result:
            result = partner_obj.search(cr, uid, [('email', 'ilike', email_address)], limit=1, context=context)
        return result[0] if result else None

    def _message_find_partners(self, cr, uid, message, header_fields=['From'], context=None):
        """ Find partners related to some header fields of the message.

            TDE TODO: merge me with other partner finding methods in 8.0 """
        partner_ids = []
        s = ', '.join([decode(message.get(h)) for h in header_fields if message.get(h)])
        for email_address in tools.email_split(s):
            partner_id = self._message_partner_id_by_email(cr, uid, email_address, context=context)
            if partner_id:
                partner_ids.append(partner_id)
        return partner_ids

    def _message_find_user_id(self, cr, uid, message, context=None):
        """ TDE TODO: check and maybe merge me with other user finding methods in 8.0 """
        from_local_part = tools.email_split(decode(message.get('From')))[0]
        # FP Note: canonification required, the minimu: .lower()
        user_ids = self.pool.get('res.users').search(cr, uid, ['|',
            ('login', '=', from_local_part),
            ('email', '=', from_local_part)], context=context)
        return user_ids[0] if user_ids else uid

    def message_route(self, cr, uid, message, model=None, thread_id=None,
                      custom_values=None, context=None):
        """Attempt to figure out the correct target model, thread_id,
        custom_values and user_id to use for an incoming message.
        Multiple values may be returned, if a message had multiple
        recipients matching existing mail.aliases, for example.

        The following heuristics are used, in this order:
             1. If the message replies to an existing thread_id, and
                properly contains the thread model in the 'In-Reply-To'
                header, use this model/thread_id pair, and ignore
                custom_value (not needed as no creation will take place)
             2. Look for a mail.alias entry matching the message
                recipient, and use the corresponding model, thread_id,
                custom_values and user_id.
             3. Fallback to the ``model``, ``thread_id`` and ``custom_values``
                provided.
             4. If all the above fails, raise an exception.

           :param string message: an email.message instance
           :param string model: the fallback model to use if the message
               does not match any of the currently configured mail aliases
               (may be None if a matching alias is supposed to be present)
           :type dict custom_values: optional dictionary of default field values
                to pass to ``message_new`` if a new record needs to be created.
                Ignored if the thread record already exists, and also if a
                matching mail.alias was found (aliases define their own defaults)
           :param int thread_id: optional ID of the record/thread from ``model``
               to which this mail should be attached. Only used if the message
               does not reply to an existing thread and does not match any mail alias.
           :return: list of [model, thread_id, custom_values, user_id]

        :raises: ValueError, TypeError
        """
        if not isinstance(message, Message):
            raise TypeError('message must be an email.message.Message at this point')
        message_id = message.get('Message-Id')
        email_from = decode_header(message, 'From')
        email_to = decode_header(message, 'To')
        references = decode_header(message, 'References')
        in_reply_to = decode_header(message, 'In-Reply-To')

        # 1. Verify if this is a reply to an existing thread
        thread_references = references or in_reply_to
        ref_match = thread_references and tools.reference_re.search(thread_references)
        if ref_match:
            reply_thread_id = int(ref_match.group(1))
            reply_model = ref_match.group(2) or model
            reply_hostname = ref_match.group(3)
            local_hostname = socket.gethostname()
            # do not match forwarded emails from another OpenERP system (thread_id collision!)
            if local_hostname == reply_hostname:
                thread_id, model = reply_thread_id, reply_model
                model_pool = self.pool.get(model)
                if thread_id and model and model_pool and model_pool.exists(cr, uid, thread_id) \
                    and hasattr(model_pool, 'message_update'):
                    _logger.info('Routing mail from %s to %s with Message-Id %s: direct reply to model: %s, thread_id: %s, custom_values: %s, uid: %s',
                                    email_from, email_to, message_id, model, thread_id, custom_values, uid)
                    return [(model, thread_id, custom_values, uid)]

        # Verify whether this is a reply to a private message
        if in_reply_to:
            message_ids = self.pool.get('mail.message').search(cr, uid, [('message_id', '=', in_reply_to)], limit=1, context=context)
            if message_ids:
                message = self.pool.get('mail.message').browse(cr, uid, message_ids[0], context=context)
                _logger.info('Routing mail from %s to %s with Message-Id %s: direct reply to a private message: %s, custom_values: %s, uid: %s',
                                email_from, email_to, message_id, message.id, custom_values, uid)
                return [(message.model, message.res_id, custom_values, uid)]

        # 2. Look for a matching mail.alias entry
        # Delivered-To is a safe bet in most modern MTAs, but we have to fallback on To + Cc values
        # for all the odd MTAs out there, as there is no standard header for the envelope's `rcpt_to` value.
        rcpt_tos = \
             ','.join([decode_header(message, 'Delivered-To'),
                       decode_header(message, 'To'),
                       decode_header(message, 'Cc'),
                       decode_header(message, 'Resent-To'),
                       decode_header(message, 'Resent-Cc')])
        local_parts = [e.split('@')[0] for e in tools.email_split(rcpt_tos)]
        if local_parts:
            mail_alias = self.pool.get('mail.alias')
            alias_ids = mail_alias.search(cr, uid, [('alias_name', 'in', local_parts)])
            if alias_ids:
                routes = []
                for alias in mail_alias.browse(cr, uid, alias_ids, context=context):
                    user_id = alias.alias_user_id.id
                    if not user_id:
                        # TDE note: this could cause crashes, because no clue that the user
                        # that send the email has the right to create or modify a new document
                        # Fallback on user_id = uid
                        # Note: recognized partners will be added as followers anyway
                        # user_id = self._message_find_user_id(cr, uid, message, context=context)
                        user_id = uid
                        _logger.info('No matching user_id for the alias %s', alias.alias_name)
                    routes.append((alias.alias_model_id.model, alias.alias_force_thread_id, \
                                   eval(alias.alias_defaults), user_id))
                _logger.info('Routing mail from %s to %s with Message-Id %s: direct alias match: %r',
                                email_from, email_to, message_id, routes)
                return routes

        # 3. Fallback to the provided parameters, if they work
        model_pool = self.pool.get(model)
        if not thread_id:
            # Legacy: fallback to matching [ID] in the Subject
            match = tools.res_re.search(decode_header(message, 'Subject'))
            thread_id = match and match.group(1)
            # Convert into int (bug spotted in 7.0 because of str)
            try:
                thread_id = int(thread_id)
            except:
                thread_id = False
        if not (thread_id and hasattr(model_pool, 'message_update') or hasattr(model_pool, 'message_new')):
            raise ValueError(
                'No possible route found for incoming message from %s to %s (Message-Id %s:). '
                'Create an appropriate mail.alias or force the destination model.' %
                (email_from, email_to, message_id)
            )
        if thread_id and not model_pool.exists(cr, uid, thread_id):
            _logger.warning('Received mail reply to missing document %s! Ignoring and creating new document instead for Message-Id %s',
                                thread_id, message_id)
            thread_id = None
        _logger.info('Routing mail from %s to %s with Message-Id %s: fallback to model:%s, thread_id:%s, custom_values:%s, uid:%s',
                        email_from, email_to, message_id, model, thread_id, custom_values, uid)
        return [(model, thread_id, custom_values, uid)]

    def message_process(self, cr, uid, model, message, custom_values=None,
                        save_original=False, strip_attachments=False,
                        thread_id=None, context=None):
        """ Process an incoming RFC2822 email message, relying on
            ``mail.message.parse()`` for the parsing operation,
            and ``message_route()`` to figure out the target model.

            Once the target model is known, its ``message_new`` method
            is called with the new message (if the thread record did not exist)
            or its ``message_update`` method (if it did).

            There is a special case where the target model is False: a reply
            to a private message. In this case, we skip the message_new /
            message_update step, to just post a new message using mail_thread
            message_post.

           :param string model: the fallback model to use if the message
               does not match any of the currently configured mail aliases
               (may be None if a matching alias is supposed to be present)
           :param message: source of the RFC2822 message
           :type message: string or xmlrpclib.Binary
           :type dict custom_values: optional dictionary of field values
                to pass to ``message_new`` if a new record needs to be created.
                Ignored if the thread record already exists, and also if a
                matching mail.alias was found (aliases define their own defaults)
           :param bool save_original: whether to keep a copy of the original
                email source attached to the message after it is imported.
           :param bool strip_attachments: whether to strip all attachments
                before processing the message, in order to save some space.
           :param int thread_id: optional ID of the record/thread from ``model``
               to which this mail should be attached. When provided, this
               overrides the automatic detection based on the message
               headers.

        :raises: ValueError, TypeError
        """
        if context is None:
            context = {}

        # extract message bytes - we are forced to pass the message as binary because
        # we don't know its encoding until we parse its headers and hence can't
        # convert it to utf-8 for transport between the mailgate script and here.
        if isinstance(message, xmlrpclib.Binary):
            message = str(message.data)
        # Warning: message_from_string doesn't always work correctly on unicode,
        # we must use utf-8 strings here :-(
        if isinstance(message, unicode):
            message = message.encode('utf-8')
        msg_txt = email.message_from_string(message)

        # parse the message, verify we are not in a loop by checking message_id is not duplicated
        msg = self.message_parse(cr, uid, msg_txt, save_original=save_original, context=context)
        if strip_attachments:
            msg.pop('attachments', None)
        if msg.get('message_id'):   # should always be True as message_parse generate one if missing
            existing_msg_ids = self.pool.get('mail.message').search(cr, SUPERUSER_ID, [
                                                                ('message_id', '=', msg.get('message_id')),
                                                                ], context=context)
            if existing_msg_ids:
                _logger.info('Ignored mail from %s to %s with Message-Id %s:: found duplicated Message-Id during processing',
                                msg.get('from'), msg.get('to'), msg.get('message_id'))
                return False

        # find possible routes for the message
        routes = self.message_route(cr, uid, msg_txt, model,
                                    thread_id, custom_values,
                                    context=context)

        # postpone setting msg.partner_ids after message_post, to avoid double notifications
        partner_ids = msg.pop('partner_ids', [])

        thread_id = False
        for model, thread_id, custom_values, user_id in routes:
            if self._name == 'mail.thread':
                context.update({'thread_model': model})
            if model:
                model_pool = self.pool.get(model)
                if not (thread_id and hasattr(model_pool, 'message_update') or hasattr(model_pool, 'message_new')):
                    raise ValueError(
                        "Undeliverable mail with Message-Id %s, model %s does not accept incoming emails" %
                        (msg['message_id'], model)
                    )

                # disabled subscriptions during message_new/update to avoid having the system user running the
                # email gateway become a follower of all inbound messages
                nosub_ctx = dict(context, mail_create_nosubscribe=True)
                if thread_id and hasattr(model_pool, 'message_update'):
                    model_pool.message_update(cr, user_id, [thread_id], msg, context=nosub_ctx)
                else:
                    nosub_ctx = dict(nosub_ctx, mail_create_nolog=True)
                    thread_id = model_pool.message_new(cr, user_id, msg, custom_values, context=nosub_ctx)
            else:
                if thread_id:
                    raise ValueError("Posting a message without model should be with a null res_id, to create a private message.")
                model_pool = self.pool.get('mail.thread')
            new_msg_id = model_pool.message_post(cr, uid, [thread_id], context=context, subtype='mail.mt_comment', **msg)

            if partner_ids:
                # postponed after message_post, because this is an external message and we don't want to create
                # duplicate emails due to notifications
                self.pool.get('mail.message').write(cr, uid, [new_msg_id], {'partner_ids': partner_ids}, context=context)

        return thread_id

    def message_new(self, cr, uid, msg_dict, custom_values=None, context=None):
        """Called by ``message_process`` when a new message is received
           for a given thread model, if the message did not belong to
           an existing thread.
           The default behavior is to create a new record of the corresponding
           model (based on some very basic info extracted from the message).
           Additional behavior may be implemented by overriding this method.

           :param dict msg_dict: a map containing the email details and
                                 attachments. See ``message_process`` and
                                ``mail.message.parse`` for details.
           :param dict custom_values: optional dictionary of additional
                                      field values to pass to create()
                                      when creating the new thread record.
                                      Be careful, these values may override
                                      any other values coming from the message.
           :param dict context: if a ``thread_model`` value is present
                                in the context, its value will be used
                                to determine the model of the record
                                to create (instead of the current model).
           :rtype: int
           :return: the id of the newly created thread object
        """
        if context is None:
            context = {}
        data = {}
        if isinstance(custom_values, dict):
            data = custom_values.copy()
        model = context.get('thread_model') or self._name
        model_pool = self.pool.get(model)
        fields = model_pool.fields_get(cr, uid, context=context)
        if 'name' in fields and not data.get('name'):
            data['name'] = msg_dict.get('subject', '')
        res_id = model_pool.create(cr, uid, data, context=context)
        return res_id

    def message_update(self, cr, uid, ids, msg_dict, update_vals=None, context=None):
        """Called by ``message_process`` when a new message is received
           for an existing thread. The default behavior is to update the record
           with update_vals taken from the incoming email.
           Additional behavior may be implemented by overriding this
           method.
           :param dict msg_dict: a map containing the email details and
                               attachments. See ``message_process`` and
                               ``mail.message.parse()`` for details.
           :param dict update_vals: a dict containing values to update records
                              given their ids; if the dict is None or is
                              void, no write operation is performed.
        """
        if update_vals:
            self.write(cr, uid, ids, update_vals, context=context)
        return True

    def _message_extract_payload(self, message, save_original=False):
        """Extract body as HTML and attachments from the mail message"""
        attachments = []
        body = u''
        if save_original:
            attachments.append(('original_email.eml', message.as_string()))

        # Be careful, content-type may contain tricky content like in the
        # following example so test the MIME type with startswith()
        #
        # Content-Type: multipart/related;
        #   boundary="_004_3f1e4da175f349248b8d43cdeb9866f1AMSPR06MB343eurprd06pro_";
        #   type="text/html"
        if not message.is_multipart() or message.get('content-type', '').startswith("text/"):
            encoding = message.get_content_charset()
            body = message.get_payload(decode=True)
            body = tools.ustr(body, encoding, errors='replace')
            if message.get_content_type() == 'text/plain':
                # text/plain -> <pre/>
                body = tools.append_content_to_html(u'', body, preserve=True)
        else:
            alternative = False
            mixed = False
            html = u''
            for part in message.walk():
                if part.get_content_type() == 'multipart/alternative':
                    alternative = True
                if part.get_content_type() == 'multipart/mixed':
                    mixed = True
                if part.get_content_maintype() == 'multipart':
                    continue  # skip container
                # part.get_filename returns decoded value if able to decode, coded otherwise.
                # original get_filename is not able to decode iso-8859-1 (for instance).
                # therefore, iso encoded attachements are not able to be decoded properly with get_filename
                # code here partially copy the original get_filename method, but handle more encoding
                filename=part.get_param('filename', None, 'content-disposition')
                if not filename:
                    filename=part.get_param('name', None)
                if filename:
                    if isinstance(filename, tuple):
                        # RFC2231
                        filename=email.utils.collapse_rfc2231_value(filename).strip()
                    else:
                        filename=decode(filename)
                encoding = part.get_content_charset()  # None if attachment
                # 1) Explicit Attachments -> attachments
                if filename or part.get('content-disposition', '').strip().startswith('attachment'):
                    attachments.append((filename or 'attachment', part.get_payload(decode=True)))
                    continue
                # 2) text/plain -> <pre/>
                if part.get_content_type() == 'text/plain' and (not alternative or not body):
                    body = tools.append_content_to_html(body, tools.ustr(part.get_payload(decode=True),
                                                                         encoding, errors='replace'), preserve=True)
                # 3) text/html -> raw
                elif part.get_content_type() == 'text/html':
                    # mutlipart/alternative have one text and a html part, keep only the second
                    # mixed allows several html parts, append html content
                    append_content = not alternative or (html and mixed)
                    html = tools.ustr(part.get_payload(decode=True), encoding, errors='replace')
                    if not append_content:
                        body = html
                    else:
                        body = tools.append_content_to_html(body, html, plaintext=False)
                # 4) Anything else -> attachment
                else:
                    attachments.append((filename or 'attachment', part.get_payload(decode=True)))
        return body, attachments

    def message_parse(self, cr, uid, message, save_original=False, context=None):
        """Parses a string or email.message.Message representing an
           RFC-2822 email, and returns a generic dict holding the
           message details.

           :param message: the message to parse
           :type message: email.message.Message | string | unicode
           :param bool save_original: whether the returned dict
               should include an ``original`` attachment containing
               the source of the message
           :rtype: dict
           :return: A dict with the following structure, where each
                    field may not be present if missing in original
                    message::

                    { 'message_id': msg_id,
                      'subject': subject,
                      'from': from,
                      'to': to,
                      'cc': cc,
                      'body': unified_body,
                      'attachments': [('file1', 'bytes'),
                                      ('file2', 'bytes')}
                    }
        """
        msg_dict = {
            'type': 'email',
            'author_id': False,
        }
        if not isinstance(message, Message):
            if isinstance(message, unicode):
                # Warning: message_from_string doesn't always work correctly on unicode,
                # we must use utf-8 strings here :-(
                message = message.encode('utf-8')
            message = email.message_from_string(message)

        message_id = message['message-id']
        if not message_id:
            # Very unusual situation, be we should be fault-tolerant here
            message_id = "<%s@localhost>" % time.time()
            _logger.debug('Parsing Message without message-id, generating a random one: %s', message_id)
        msg_dict['message_id'] = message_id

        if message.get('Subject'):
            msg_dict['subject'] = decode(message.get('Subject'))

        # Envelope fields not stored in mail.message but made available for message_new()
        msg_dict['from'] = decode(message.get('from'))
        msg_dict['to'] = decode(message.get('to'))
        msg_dict['cc'] = decode(message.get('cc'))

        if message.get('From'):
            author_ids = self._message_find_partners(cr, uid, message, ['From'], context=context)
            if author_ids:
                msg_dict['author_id'] = author_ids[0]
            msg_dict['email_from'] = decode(message.get('from'))
        partner_ids = self._message_find_partners(cr, uid, message, ['To', 'Cc'], context=context)
        msg_dict['partner_ids'] = [(4, partner_id) for partner_id in partner_ids]

        if message.get('Date'):
            try:
                date_hdr = decode(message.get('Date'))
                parsed_date = dateutil.parser.parse(date_hdr, fuzzy=True)
                if parsed_date.utcoffset() is None:
                    # naive datetime, so we arbitrarily decide to make it
                    # UTC, there's no better choice. Should not happen,
                    # as RFC2822 requires timezone offset in Date headers.
                    stored_date = parsed_date.replace(tzinfo=pytz.utc)
                else:
                    stored_date = parsed_date.astimezone(tz=pytz.utc)
            except Exception:
                _logger.warning('Failed to parse Date header %r in incoming mail '
                                'with message-id %r, assuming current date/time.',
                                message.get('Date'), message_id)
                stored_date = datetime.datetime.now()
            msg_dict['date'] = stored_date.strftime(tools.DEFAULT_SERVER_DATETIME_FORMAT)

        if message.get('In-Reply-To'):
            parent_ids = self.pool.get('mail.message').search(cr, uid, [('message_id', '=', decode(message['In-Reply-To'].strip()))])
            if parent_ids:
                msg_dict['parent_id'] = parent_ids[0]

        if message.get('References') and 'parent_id' not in msg_dict:
            msg_list =  mail_header_msgid_re.findall(decode(message['References']))
            parent_ids = self.pool.get('mail.message').search(cr, uid, [('message_id', 'in', [x.strip() for x in msg_list])])
            if parent_ids:
                msg_dict['parent_id'] = parent_ids[0]

        msg_dict['body'], msg_dict['attachments'] = self._message_extract_payload(message, save_original=save_original)
        return msg_dict

    #------------------------------------------------------
    # Note specific
    #------------------------------------------------------

    def log(self, cr, uid, id, message, secondary=False, context=None):
        _logger.warning("log() is deprecated. As this module inherit from "\
                        "mail.thread, the message will be managed by this "\
                        "module instead of by the res.log mechanism. Please "\
                        "use mail_thread.message_post() instead of the "\
                        "now deprecated res.log.")
        self.message_post(cr, uid, [id], message, context=context)

    def _message_add_suggested_recipient(self, cr, uid, result, obj, partner=None, email=None, reason='', context=None):
        """ Called by message_get_suggested_recipients, to add a suggested
            recipient in the result dictionary. The form is :
                partner_id, partner_name<partner_email> or partner_name, reason """
        if email and not partner:
            # get partner info from email
            partner_info = self.message_get_partner_info_from_emails(cr, uid, [email], context=context, res_id=obj.id)
            if partner_info and partner_info[0].get('partner_id'):
                partner = self.pool.get('res.partner').browse(cr, SUPERUSER_ID, [partner_info[0]['partner_id']], context=context)[0]
        if email and email in [val[1] for val in result[obj.id]]:  # already existing email -> skip
            return result
        if partner and partner in obj.message_follower_ids:  # recipient already in the followers -> skip
            return result
        if partner and partner.id in [val[0] for val in result[obj.id]]:  # already existing partner ID -> skip
            return result
        if partner and partner.email:  # complete profile: id, name <email>
            result[obj.id].append((partner.id, '%s<%s>' % (partner.name, partner.email), reason))
        elif partner:  # incomplete profile: id, name
            result[obj.id].append((partner.id, '%s' % (partner.name), reason))
        else:  # unknown partner, we are probably managing an email address
            result[obj.id].append((False, email, reason))
        return result

    def message_get_suggested_recipients(self, cr, uid, ids, context=None):
        """ Returns suggested recipients for ids. Those are a list of
            tuple (partner_id, partner_name, reason), to be managed by Chatter. """
        result = dict.fromkeys(ids, list())
        if self._all_columns.get('user_id'):
            for obj in self.browse(cr, SUPERUSER_ID, ids, context=context):  # SUPERUSER because of a read on res.users that would crash otherwise
                if not obj.user_id or not obj.user_id.partner_id:
                    continue
                self._message_add_suggested_recipient(cr, uid, result, obj, partner=obj.user_id.partner_id, reason=self._all_columns['user_id'].column.string, context=context)
        return result

    def message_get_partner_info_from_emails(self, cr, uid, emails, link_mail=False, context=None, res_id=None):
        """ Wrapper with weird order parameter because of 7.0 fix.

            TDE TODO: remove me in 8.0 """
        return self.message_find_partner_from_emails(cr, uid, res_id, emails, link_mail=link_mail, context=context)

    def message_find_partner_from_emails(self, cr, uid, id, emails, link_mail=False, context=None):
        """ Convert a list of emails into a list partner_ids and a list
            new_partner_ids. The return value is non conventional because
            it is meant to be used by the mail widget.

            :return dict: partner_ids and new_partner_ids

            TDE TODO: merge me with other partner finding methods in 8.0 """
        mail_message_obj = self.pool.get('mail.message')
        result = list()
        if id and self._name != 'mail.thread':
            obj = self.browse(cr, SUPERUSER_ID, id, context=context)
        else:
            obj = None
        for email in emails:
            partner_info = {'full_name': email, 'partner_id': False}
            split = tools.email_split(email)
            if not split:
                continue
            email_address = split[0]
            # first try: check in document's followers
            if obj:
                for follower in obj.message_follower_ids:
                    if follower.email == email_address:
                        partner_info['partner_id'] = follower.id
            # second try: check in partners
            if not partner_info.get('partner_id'):
                partner_id = self._message_partner_id_by_email(cr, uid, email_address, context=context)
                if partner_id:
                    partner_info['partner_id'] = partner_id
            result.append(partner_info)

            # link mail with this from mail to the new partner id
            if link_mail and partner_info['partner_id']:
                message_ids = mail_message_obj.search(cr, SUPERUSER_ID, [
                                    '|',
                                    ('email_from', '=', email),
                                    ('email_from', 'ilike', '<%s>' % email),
                                    ('author_id', '=', False)
                                ], context=context)
                if message_ids:
                    mail_message_obj.write(cr, SUPERUSER_ID, message_ids, {'author_id': partner_info['partner_id']}, context=context)
        return result

    def message_post(self, cr, uid, thread_id, body='', subject=None, type='notification',
                        subtype=None, parent_id=False, attachments=None, context=None,
                        content_subtype='html', **kwargs):
        """ Post a new message in an existing thread, returning the new
            mail.message ID.

            :param int thread_id: thread ID to post into, or list with one ID;
                if False/0, mail.message model will also be set as False
            :param str body: body of the message, usually raw HTML that will
                be sanitized
            :param str type: see mail_message.type field
            :param str content_subtype:: if plaintext: convert body into html
            :param int parent_id: handle reply to a previous message by adding the
                parent partners to the message in case of private discussion
            :param tuple(str,str) attachments or list id: list of attachment tuples in the form
                ``(name,content)``, where content is NOT base64 encoded

            Extra keyword arguments will be used as default column values for the
            new mail.message record. Special cases:
                - attachment_ids: supposed not attached to any document; attach them
                    to the related document. Should only be set by Chatter.
            :return int: ID of newly created mail.message
        """
        if context is None:
            context = {}
        if attachments is None:
            attachments = {}
        mail_message = self.pool.get('mail.message')
        ir_attachment = self.pool.get('ir.attachment')

        assert (not thread_id) or \
                isinstance(thread_id, (int, long)) or \
                (isinstance(thread_id, (list, tuple)) and len(thread_id) == 1), \
                "Invalid thread_id; should be 0, False, an ID or a list with one ID"
        if isinstance(thread_id, (list, tuple)):
            thread_id = thread_id[0]

        # if we're processing a message directly coming from the gateway, the destination model was
        # set in the context.
        model = False
        if thread_id:
            model = context.get('thread_model', self._name) if self._name == 'mail.thread' else self._name
            if model != self._name:
                del context['thread_model']
                return self.pool.get(model).message_post(cr, uid, thread_id, body=body, subject=subject, type=type, subtype=subtype, parent_id=parent_id, attachments=attachments, context=context, content_subtype=content_subtype, **kwargs)

        # 0: Parse email-from, try to find a better author_id based on document's followers for incoming emails
        email_from = kwargs.get('email_from')
        if email_from and thread_id and type == 'email' and kwargs.get('author_id'):
            email_list = tools.email_split(email_from)
            doc = self.browse(cr, uid, thread_id, context=context)
            if email_list and doc:
                author_ids = self.pool.get('res.partner').search(cr, uid, [
                                        ('email', 'ilike', email_list[0]),
                                        ('id', 'in', [f.id for f in doc.message_follower_ids])
                                    ], limit=1, context=context)
                if author_ids:
                    kwargs['author_id'] = author_ids[0]
        author_id = kwargs.get('author_id')
        if author_id is None:  # keep False values
            author_id = self.pool.get('mail.message')._get_default_author(cr, uid, context=context)

        # 1: Handle content subtype: if plaintext, converto into HTML
        if content_subtype == 'plaintext':
            body = tools.plaintext2html(body)

        # 2: Private message: add recipients (recipients and author of parent message) - current author
        #   + legacy-code management (! we manage only 4 and 6 commands)
        partner_ids = set()
        kwargs_partner_ids = kwargs.pop('partner_ids', [])
        for partner_id in kwargs_partner_ids:
            if isinstance(partner_id, (list, tuple)) and partner_id[0] == 4 and len(partner_id) == 2:
                partner_ids.add(partner_id[1])
            if isinstance(partner_id, (list, tuple)) and partner_id[0] == 6 and len(partner_id) == 3:
                partner_ids |= set(partner_id[2])
            elif isinstance(partner_id, (int, long)):
                partner_ids.add(partner_id)
            else:
                pass  # we do not manage anything else
        if parent_id and not model:
            parent_message = mail_message.browse(cr, uid, parent_id, context=context)
            private_followers = set([partner.id for partner in parent_message.partner_ids])
            if parent_message.author_id:
                private_followers.add(parent_message.author_id.id)
            private_followers -= set([author_id])
            partner_ids |= private_followers

        # 3. Attachments
        #   - HACK TDE FIXME: Chatter: attachments linked to the document (not done JS-side), load the message
        attachment_ids = kwargs.pop('attachment_ids', []) or []  # because we could receive None (some old code sends None)
        if attachment_ids:
            filtered_attachment_ids = ir_attachment.search(cr, SUPERUSER_ID, [
                ('res_model', '=', 'mail.compose.message'),
                ('create_uid', '=', uid),
                ('id', 'in', attachment_ids)], context=context)
            if filtered_attachment_ids:
                ir_attachment.write(cr, SUPERUSER_ID, filtered_attachment_ids, {'res_model': model, 'res_id': thread_id}, context=context)
        attachment_ids = [(4, id) for id in attachment_ids]
        # Handle attachments parameter, that is a dictionary of attachments
        for name, content in attachments:
            if isinstance(content, unicode):
                content = content.encode('utf-8')
            data_attach = {
                'name': name,
                'datas': base64.b64encode(str(content)),
                'datas_fname': name,
                'description': name,
                'res_model': model,
                'res_id': thread_id,
            }
            attachment_ids.append((0, 0, data_attach))

        # 4: mail.message.subtype
        subtype_id = False
        if subtype:
            if '.' not in subtype:
                subtype = 'mail.%s' % subtype
            ref = self.pool.get('ir.model.data').get_object_reference(cr, uid, *subtype.split('.'))
            subtype_id = ref and ref[1] or False

        # automatically subscribe recipients if asked to
        if context.get('mail_post_autofollow') and thread_id and partner_ids:
            partner_to_subscribe = partner_ids
            if context.get('mail_post_autofollow_partner_ids'):
                partner_to_subscribe = filter(lambda item: item in context.get('mail_post_autofollow_partner_ids'), partner_ids)
            self.message_subscribe(cr, uid, [thread_id], list(partner_to_subscribe), context=context)

        # _mail_flat_thread: automatically set free messages to the first posted message
        if self._mail_flat_thread and not parent_id and thread_id:
            message_ids = mail_message.search(cr, uid, ['&', ('res_id', '=', thread_id), ('model', '=', model), ('type', '=', 'email')], context=context, order="id ASC", limit=1)
            if not message_ids:
                message_ids = message_ids = mail_message.search(cr, uid, ['&', ('res_id', '=', thread_id), ('model', '=', model)], context=context, order="id ASC", limit=1)
            parent_id = message_ids and message_ids[0] or False
        # we want to set a parent: force to set the parent_id to the oldest ancestor, to avoid having more than 1 level of thread
        elif parent_id:
            message_ids = mail_message.search(cr, SUPERUSER_ID, [('id', '=', parent_id), ('parent_id', '!=', False)], context=context)
            # avoid loops when finding ancestors
            processed_list = []
            if message_ids:
                message = mail_message.browse(cr, SUPERUSER_ID, message_ids[0], context=context)
                while (message.parent_id and message.parent_id.id not in processed_list):
                    processed_list.append(message.parent_id.id)
                    message = message.parent_id
                parent_id = message.id

        values = kwargs
        values.update({
            'author_id': author_id,
            'model': model,
            'res_id': thread_id or False,
            'body': body,
            'subject': subject or False,
            'type': type,
            'parent_id': parent_id,
            'attachment_ids': attachment_ids,
            'subtype_id': subtype_id,
            'partner_ids': [(4, pid) for pid in partner_ids],
        })

        # Avoid warnings about non-existing fields
        for x in ('from', 'to', 'cc'):
            values.pop(x, None)

        # Create and auto subscribe the author
        msg_id = mail_message.create(cr, uid, values, context=context)
        message = mail_message.browse(cr, uid, msg_id, context=context)
        if message.author_id and thread_id and type != 'notification' and not context.get('mail_create_nosubscribe'):
            self.message_subscribe(cr, uid, [thread_id], [message.author_id.id], context=context)
        return msg_id

    #------------------------------------------------------
    # Compatibility methods: do not use
    # TDE TODO: remove me in 8.0
    #------------------------------------------------------

    def message_create_partners_from_emails(self, cr, uid, emails, context=None):
        return {'partner_ids': [], 'new_partner_ids': []}

    def message_post_user_api(self, cr, uid, thread_id, body='', parent_id=False,
                                attachment_ids=None, content_subtype='plaintext',
                                context=None, **kwargs):
        return self.message_post(cr, uid, thread_id, body=body, parent_id=parent_id,
                                    attachment_ids=attachment_ids, content_subtype=content_subtype,
                                    context=context, **kwargs)

    #------------------------------------------------------
    # Followers API
    #------------------------------------------------------

    def message_get_subscription_data(self, cr, uid, ids, context=None):
        """ Wrapper to get subtypes data. """
        return self._get_subscription_data(cr, uid, ids, None, None, context=context)

    def message_subscribe_users(self, cr, uid, ids, user_ids=None, subtype_ids=None, context=None):
        """ Wrapper on message_subscribe, using users. If user_ids is not
            provided, subscribe uid instead. """
        if user_ids is None:
            user_ids = [uid]
        partner_ids = [user.partner_id.id for user in self.pool.get('res.users').browse(cr, uid, user_ids, context=context)]
        return self.message_subscribe(cr, uid, ids, partner_ids, subtype_ids=subtype_ids, context=context)

    def message_subscribe(self, cr, uid, ids, partner_ids, subtype_ids=None, context=None):
        """ Add partners to the records followers. """
        if context is None:
            context = {}
        # not necessary for computation, but saves an access right check
        if not partner_ids:
            return True

        mail_followers_obj = self.pool.get('mail.followers')
        subtype_obj = self.pool.get('mail.message.subtype')

        user_pid = self.pool.get('res.users').browse(cr, uid, uid, context=context).partner_id.id
        if set(partner_ids) == set([user_pid]):
            try:
                self.check_access_rights(cr, uid, 'read')
                if context.get('operation', '') == 'create':
                    self.check_access_rule(cr, uid, ids, 'create')
                else:
                    self.check_access_rule(cr, uid, ids, 'read')
            except (osv.except_osv, orm.except_orm):
                return False
        else:
            self.check_access_rights(cr, uid, 'write')
            self.check_access_rule(cr, uid, ids, 'write')

        existing_pids_dict = {}
        fol_ids = mail_followers_obj.search(cr, SUPERUSER_ID, ['&', '&', ('res_model', '=', self._name), ('res_id', 'in', ids), ('partner_id', 'in', partner_ids)])
        for fol in mail_followers_obj.browse(cr, SUPERUSER_ID, fol_ids, context=context):
            existing_pids_dict.setdefault(fol.res_id, set()).add(fol.partner_id.id)

        # subtype_ids specified: update already subscribed partners
        if subtype_ids and fol_ids:
            mail_followers_obj.write(cr, SUPERUSER_ID, fol_ids, {'subtype_ids': [(6, 0, subtype_ids)]}, context=context)
        # subtype_ids not specified: do not update already subscribed partner, fetch default subtypes for new partners
        if subtype_ids is None:
            subtype_ids = subtype_obj.search(
                cr, uid, [
                    ('default', '=', True), '|', ('res_model', '=', self._name), ('res_model', '=', False)], context=context)

        for id in ids:
            existing_pids = existing_pids_dict.get(id, set())
            new_pids = set(partner_ids) - existing_pids

            # subscribe new followers
            for new_pid in new_pids:
                mail_followers_obj.create(
                    cr, SUPERUSER_ID, {
                        'res_model': self._name,
                        'res_id': id,
                        'partner_id': new_pid,
                        'subtype_ids': [(6, 0, subtype_ids)],
                    }, context=context)

        return True

    def message_unsubscribe_users(self, cr, uid, ids, user_ids=None, context=None):
        """ Wrapper on message_subscribe, using users. If user_ids is not
            provided, unsubscribe uid instead. """
        if user_ids is None:
            user_ids = [uid]
        partner_ids = [user.partner_id.id for user in self.pool.get('res.users').browse(cr, uid, user_ids, context=context)]
        return self.message_unsubscribe(cr, uid, ids, partner_ids, context=context)

    def message_unsubscribe(self, cr, uid, ids, partner_ids, context=None):
        """ Remove partners from the records followers. """
        # not necessary for computation, but saves an access right check
        if not partner_ids:
            return True
        user_pid = self.pool.get('res.users').read(cr, uid, uid, ['partner_id'], context=context)['partner_id'][0]
        if set(partner_ids) == set([user_pid]):
            self.check_access_rights(cr, uid, 'read')
            self.check_access_rule(cr, uid, ids, 'read')
        else:
            self.check_access_rights(cr, uid, 'write')
            self.check_access_rule(cr, uid, ids, 'write')
        fol_obj = self.pool['mail.followers']
        fol_ids = fol_obj.search(
            cr, SUPERUSER_ID, [
                ('res_model', '=', self._name),
                ('res_id', 'in', ids),
                ('partner_id', 'in', partner_ids)
            ], context=context)
        return fol_obj.unlink(cr, SUPERUSER_ID, fol_ids, context=context)

    def _message_get_auto_subscribe_fields(self, cr, uid, updated_fields, auto_follow_fields=['user_id'], context=None):
        """ Returns the list of relational fields linking to res.users that should
            trigger an auto subscribe. The default list checks for the fields
            - called 'user_id'
            - linking to res.users
            - with track_visibility set
            In OpenERP V7, this is sufficent for all major addon such as opportunity,
            project, issue, recruitment, sale.
            Override this method if a custom behavior is needed about fields
            that automatically subscribe users.
        """
        user_field_lst = []
        for name, column_info in self._all_columns.items():
            if name in auto_follow_fields and name in updated_fields and getattr(column_info.column, 'track_visibility', False) and column_info.column._obj == 'res.users':
                user_field_lst.append(name)
        return user_field_lst

    def message_auto_subscribe(self, cr, uid, ids, updated_fields, context=None, values=None):
        """ Handle auto subscription. Two methods for auto subscription exist:

         - tracked res.users relational fields, such as user_id fields. Those fields
           must be relation fields toward a res.users record, and must have the
           track_visilibity attribute set.
         - using subtypes parent relationship: check if the current model being
           modified has an header record (such as a project for tasks) whose followers
           can be added as followers of the current records. Example of structure
           with project and task:

          - st_project_1.parent_id = st_task_1
          - st_project_1.res_model = 'project.project'
          - st_project_1.relation_field = 'project_id'
          - st_task_1.model = 'project.task'

        :param list updated_fields: list of updated fields to track
        :param dict values: updated values; if None, the first record will be browsed
                            to get the values. Added after releasing 7.0, therefore
                            not merged with updated_fields argumment.
        """
        subtype_obj = self.pool.get('mail.message.subtype')
        follower_obj = self.pool.get('mail.followers')
        notification_obj = self.pool.get('mail.notification')
        new_followers = dict()

        # fetch auto_follow_fields: res.users relation fields whose changes are tracked for subscription
        user_field_lst = self._message_get_auto_subscribe_fields(cr, uid, updated_fields, context=context)

        # fetch header subtypes
        header_subtype_ids = subtype_obj.search(cr, uid, ['|', ('res_model', '=', False), ('parent_id.res_model', '=', self._name)], context=context)
        subtypes = subtype_obj.browse(cr, uid, header_subtype_ids, context=context)

        # if no change in tracked field or no change in tracked relational field: quit
        relation_fields = set([subtype.relation_field for subtype in subtypes if subtype.relation_field is not False])
        if not any(relation in updated_fields for relation in relation_fields) and not user_field_lst:
            return True

        # legacy behavior: if values is not given, compute the values by browsing
        # @TDENOTE: remove me in 8.0
        if values is None:
            record = self.browse(cr, uid, ids[0], context=context)
            for updated_field in updated_fields:
                field_value = getattr(record, updated_field)
                if isinstance(field_value, browse_record):
                    field_value = field_value.id
                elif isinstance(field_value, browse_null):
                    field_value = False
                values[updated_field] = field_value

        # find followers of headers, update structure for new followers
        headers = set()
        for subtype in subtypes:
            if subtype.relation_field and values.get(subtype.relation_field):
                headers.add((subtype.res_model, values.get(subtype.relation_field)))
        if headers:
            header_domain = ['|'] * (len(headers) - 1)
            for header in headers:
                header_domain += ['&', ('res_model', '=', header[0]), ('res_id', '=', header[1])]
            header_follower_ids = follower_obj.search(
                cr, SUPERUSER_ID,
                header_domain,
                context=context
            )
            for header_follower in follower_obj.browse(cr, SUPERUSER_ID, header_follower_ids, context=context):
                for subtype in header_follower.subtype_ids:
                    if subtype.parent_id and subtype.parent_id.res_model == self._name:
                        new_followers.setdefault(header_follower.partner_id.id, set()).add(subtype.parent_id.id)
                    elif subtype.res_model is False:
                        new_followers.setdefault(header_follower.partner_id.id, set()).add(subtype.id)

        # add followers coming from res.users relational fields that are tracked
        user_ids = [values[name] for name in user_field_lst if values.get(name)]
        user_pids = [user.partner_id.id for user in self.pool.get('res.users').browse(cr, SUPERUSER_ID, user_ids, context=context)]
        for partner_id in user_pids:
            new_followers.setdefault(partner_id, None)

        for pid, subtypes in new_followers.items():
            subtypes = list(subtypes) if subtypes is not None else None
            self.message_subscribe(cr, uid, ids, [pid], subtypes, context=context)

        # find first email message, set it as unread for auto_subscribe fields for them to have a notification
        if user_pids:
            for record_id in ids:
                message_obj = self.pool.get('mail.message')
                msg_ids = message_obj.search(cr, SUPERUSER_ID, [
                    ('model', '=', self._name),
                    ('res_id', '=', record_id),
                    ('type', '=', 'email')], limit=1, context=context)
                if not msg_ids:
                    msg_ids = message_obj.search(cr, SUPERUSER_ID, [
                        ('model', '=', self._name),
                        ('res_id', '=', record_id)], limit=1, context=context)
                if msg_ids:
                    notification_obj._notify(cr, uid, msg_ids[0], partners_to_notify=user_pids, context=context)
                    message = message_obj.browse(cr, uid, msg_ids[0], context=context)
                    if message.parent_id:
                        partner_ids_to_parent_notify = set(user_pids).difference(partner.id for partner in message.parent_id.notified_partner_ids)
                        for partner_id in partner_ids_to_parent_notify:
                            notification_obj.create(cr, uid, {
                                'message_id': message.parent_id.id,
                                'partner_id': partner_id,
                                'read': True,
                            }, context=context)

        return True

    #------------------------------------------------------
    # Thread state
    #------------------------------------------------------

    def message_mark_as_unread(self, cr, uid, ids, context=None):
        """ Set as unread. """
        partner_id = self.pool.get('res.users').browse(cr, uid, uid, context=context).partner_id.id
        cr.execute('''
            UPDATE mail_notification SET
                read=false
            WHERE
                message_id IN (SELECT id from mail_message where res_id=any(%s) and model=%s limit 1) and
                partner_id = %s
        ''', (ids, self._name, partner_id))
        return True

    def message_mark_as_read(self, cr, uid, ids, context=None):
        """ Set as read. """
        partner_id = self.pool.get('res.users').browse(cr, uid, uid, context=context).partner_id.id
        cr.execute('''
            UPDATE mail_notification SET
                read=true
            WHERE
                message_id IN (SELECT id FROM mail_message WHERE res_id=ANY(%s) AND model=%s) AND
                partner_id = %s
        ''', (ids, self._name, partner_id))
        return True

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