# -*- encoding: utf-8 -*-
##############################################################################
#
#    OpenERP, Open Source Management Solution
#    Copyright (C) 2004-2009 Tiny SPRL (<http://tiny.be>). All Rights Reserved
#    $Id$
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU 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 General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
##############################################################################

# . Fields:
#      - simple
#      - relations (one2many, many2one, many2many)
#      - function
#
# Fields Attributes:
#   _classic_read: is a classic sql fields
#   _type   : field type
#   readonly
#   required
#   size
#
import string
import netsvc

from psycopg2 import Binary
import warnings

import tools


def _symbol_set(symb):
    if symb == None or symb == False:
        return None
    elif isinstance(symb, unicode):
        return symb.encode('utf-8')
    return str(symb)


class _column(object):
    _classic_read = True
    _classic_write = True
    _properties = False
    _type = 'unknown'
    _obj = None
    _multi = False
    _symbol_c = '%s'
    _symbol_f = _symbol_set
    _symbol_set = (_symbol_c, _symbol_f)
    _symbol_get = None

    def __init__(self, string='unknown', required=False, readonly=False, domain=None, context='', states=None, priority=0, change_default=False, size=None, ondelete="set null", translate=False, select=False, **args):
        self.states = states or {}
        self.string = string
        self.readonly = readonly
        self.required = required
        self.size = size
        self.help = args.get('help', '')
        self.priority = priority
        self.change_default = change_default
        self.ondelete = ondelete
        self.translate = translate
        self._domain = domain or []
        self._context = context
        self.write = False
        self.read = False
        self.view_load = 0
        self.select = select
        for a in args:
            if args[a]:
                setattr(self, a, args[a])

    def restart(self):
        pass

    def set(self, cr, obj, id, name, value, user=None, context=None):
        cr.execute('update '+obj._table+' set '+name+'='+self._symbol_set[0]+' where id=%s', (self._symbol_set[1](value), id))

    def set_memory(self, cr, obj, id, name, value, user=None, context=None):
        raise Exception(_('Not implemented set_memory method !'))

    def get_memory(self, cr, obj, ids, name, user=None, context=None, values=None):
        raise Exception(_('Not implemented get_memory method !'))

    def get(self, cr, obj, ids, name, user=None, offset=0, context=None, values=None):
        raise Exception(_('undefined get method !'))

    def search(self, cr, obj, args, name, value, offset=0, limit=None, uid=None):
        ids = obj.search(cr, uid, args+self._domain+[(name, 'ilike', value)], offset, limit)
        res = obj.read(cr, uid, ids, [name])
        return [x[name] for x in res]

    def search_memory(self, cr, obj, args, name, value, offset=0, limit=None, uid=None, context=None):
        raise Exception(_('Not implemented search_memory method !'))


# ---------------------------------------------------------
# Simple fields
# ---------------------------------------------------------
class boolean(_column):
    _type = 'boolean'
    _symbol_c = '%s'
    _symbol_f = lambda x: x and 'True' or 'False'
    _symbol_set = (_symbol_c, _symbol_f)


class integer_big(_column):
    _type = 'integer_big'
    _symbol_c = '%s'
    _symbol_f = lambda x: int(x or 0)
    _symbol_set = (_symbol_c, _symbol_f)

class integer(_column):
    _type = 'integer'
    _symbol_c = '%s'
    _symbol_f = lambda x: int(x or 0)
    _symbol_set = (_symbol_c, _symbol_f)


class reference(_column):
    _type = 'reference'

    def __init__(self, string, selection, size, **args):
        _column.__init__(self, string=string, size=size, selection=selection, **args)


class char(_column):
    _type = 'char'

    def __init__(self, string, size, **args):
        _column.__init__(self, string=string, size=size, **args)
        self._symbol_set = (self._symbol_c, self._symbol_set_char)

    # takes a string (encoded in utf8) and returns a string (encoded in utf8)
    def _symbol_set_char(self, symb):
        #TODO:
        # * we need to remove the "symb==False" from the next line BUT
        #   for now too many things rely on this broken behavior
        # * the symb==None test should be common to all data types
        if symb == None or symb == False:
            return None

        # we need to convert the string to a unicode object to be able
        # to evaluate its length (and possibly truncate it) reliably
        if isinstance(symb, str):
            u_symb = unicode(symb, 'utf8')
        elif isinstance(symb, unicode):
            u_symb = symb
        else:
            u_symb = unicode(symb)
        return u_symb[:self.size].encode('utf8')


class text(_column):
    _type = 'text'

import __builtin__

class float(_column):
    _type = 'float'
    _symbol_c = '%s'
    _symbol_f = lambda x: __builtin__.float(x or 0.0)
    _symbol_set = (_symbol_c, _symbol_f)

    def __init__(self, string='unknown', digits=None, **args):
        _column.__init__(self, string=string, **args)
        self.digits = digits


class date(_column):
    _type = 'date'


class datetime(_column):
    _type = 'datetime'


class time(_column):
    _type = 'time'


class binary(_column):
    _type = 'binary'
    _symbol_c = '%s'
    _symbol_f = lambda symb: symb and Binary(symb) or None
    _symbol_set = (_symbol_c, _symbol_f)
    _symbol_get = lambda self, x: x and str(x)

    _classic_read = False

    def __init__(self, string='unknown', filters=None, **args):
        _column.__init__(self, string=string, **args)
        self.filters = filters

    def get_memory(self, cr, obj, ids, name, user=None, context=None, values=None):
        if not context:
            context = {}
        if not values:
            values = []
        res = {}
        for i in ids:
            val = None
            for v in values:
                if v['id'] == i:
                    val = v[name]
                    break
            if context.get('bin_size', False):
                res[i] = tools.human_size(val)
            else:
                res[i] = val
        return res

    get = get_memory


class selection(_column):
    _type = 'selection'

    def __init__(self, selection, string='unknown', **args):
        _column.__init__(self, string=string, **args)
        self.selection = selection

# ---------------------------------------------------------
# Relationals fields
# ---------------------------------------------------------

#
# Values: (0, 0,  { fields })    create
#         (1, ID, { fields })    modification
#         (2, ID)                remove (delete)
#         (3, ID)                unlink one (target id or target of relation)
#         (4, ID)                link
#         (5)                    unlink all (only valid for one2many)
#
#CHECKME: dans la pratique c'est quoi la syntaxe utilisee pour le 5? (5) ou (5, 0)?
class one2one(_column):
    _classic_read = False
    _classic_write = True
    _type = 'one2one'

    def __init__(self, obj, string='unknown', **args):
        warnings.warn("The one2one field doesn't work anymore", DeprecationWarning)
        _column.__init__(self, string=string, **args)
        self._obj = obj

    def set(self, cr, obj_src, id, field, act, user=None, context=None):
        if not context:
            context = {}
        obj = obj_src.pool.get(self._obj)
        self._table = obj_src.pool.get(self._obj)._table
        if act[0] == 0:
            id_new = obj.create(cr, user, act[1])
            cr.execute('update '+obj_src._table+' set '+field+'=%s where id=%s', (id_new, id))
        else:
            cr.execute('select '+field+' from '+obj_src._table+' where id=%s', (act[0],))
            id = cr.fetchone()[0]
            obj.write(cr, user, [id], act[1], context=context)

    def search(self, cr, obj, args, name, value, offset=0, limit=None, uid=None):
        return obj.pool.get(self._obj).search(cr, uid, args+self._domain+[('name', 'like', value)], offset, limit)


class many2one(_column):
    _classic_read = False
    _classic_write = True
    _type = 'many2one'
    _symbol_c = '%s'
    _symbol_f = lambda x: x or None
    _symbol_set = (_symbol_c, _symbol_f)

    def __init__(self, obj, string='unknown', **args):
        _column.__init__(self, string=string, **args)
        self._obj = obj

    def set_memory(self, cr, obj, id, field, values, user=None, context=None):
        obj.datas.setdefault(id, {})
        obj.datas[id][field] = values

    def get_memory(self, cr, obj, ids, name, user=None, context=None, values=None):
        result = {}
        for id in ids:
            result[id] = obj.datas[id][name]
        return result

    def get(self, cr, obj, ids, name, user=None, context=None, values=None):
        if not context:
            context = {}
        if not values:
            values = {}
        res = {}
        for r in values:
            res[r['id']] = r[name]
        for id in ids:
            res.setdefault(id, '')
        obj = obj.pool.get(self._obj)
        # build a dictionary of the form {'id_of_distant_resource': name_of_distant_resource}
        from orm import except_orm
        try:
            names = dict(obj.name_get(cr, user, filter(None, res.values()), context))
        except except_orm:
            names = {}

            iids = filter(None, res.values())
            cr.execute('select id,'+obj._rec_name+' from '+obj._table+' where id in ('+','.join(map(str, iids))+')')
            for res22 in cr.fetchall():
                names[res22[0]] = res22[1]

        for r in res.keys():
            if res[r] and res[r] in names:
                res[r] = (res[r], names[res[r]])
            else:
                res[r] = False
        return res

    def set(self, cr, obj_src, id, field, values, user=None, context=None):
        if not context:
            context = {}
        obj = obj_src.pool.get(self._obj)
        self._table = obj_src.pool.get(self._obj)._table
        if type(values) == type([]):
            for act in values:
                if act[0] == 0:
                    id_new = obj.create(cr, act[2])
                    cr.execute('update '+obj_src._table+' set '+field+'=%s where id=%s', (id_new, id))
                elif act[0] == 1:
                    obj.write(cr, [act[1]], act[2], context=context)
                elif act[0] == 2:
                    cr.execute('delete from '+self._table+' where id=%s', (act[1],))
                elif act[0] == 3 or act[0] == 5:
                    cr.execute('update '+obj_src._table+' set '+field+'=null where id=%s', (id,))
                elif act[0] == 4:
                    cr.execute('update '+obj_src._table+' set '+field+'=%s where id=%s', (act[1], id))
        else:
            if values:
                cr.execute('update '+obj_src._table+' set '+field+'=%s where id=%s', (values, id))
            else:
                cr.execute('update '+obj_src._table+' set '+field+'=null where id=%s', (id,))

    def search(self, cr, obj, args, name, value, offset=0, limit=None, uid=None):
        return obj.pool.get(self._obj).search(cr, uid, args+self._domain+[('name', 'like', value)], offset, limit)


class one2many(_column):
    _classic_read = False
    _classic_write = False
    _type = 'one2many'

    def __init__(self, obj, fields_id, string='unknown', limit=None, **args):
        _column.__init__(self, string=string, **args)
        self._obj = obj
        self._fields_id = fields_id
        self._limit = limit
        #one2many can't be used as condition for defaults
        assert(self.change_default != True)

    def get_memory(self, cr, obj, ids, name, user=None, offset=0, context=None, values=None):
        if not context:
            context = {}
        if not values:
            values = {}
        res = {}
        for id in ids:
            res[id] = []
        ids2 = obj.pool.get(self._obj).search(cr, user, [(self._fields_id, 'in', ids)], limit=self._limit)
        for r in obj.pool.get(self._obj).read(cr, user, ids2, [self._fields_id], context=context, load='_classic_write'):
            if r[self._fields_id] in res:
                res[r[self._fields_id]].append(r['id'])
        return res

    def set_memory(self, cr, obj, id, field, values, user=None, context=None):
        if not context:
            context = {}
        if not values:
            return
        obj = obj.pool.get(self._obj)
        for act in values:
            if act[0] == 0:
                act[2][self._fields_id] = id
                obj.create(cr, user, act[2], context=context)
            elif act[0] == 1:
                obj.write(cr, user, [act[1]], act[2], context=context)
            elif act[0] == 2:
                obj.unlink(cr, user, [act[1]], context=context)
            elif act[0] == 3:
                obj.datas[act[1]][self._fields_id] = False
            elif act[0] == 4:
                obj.datas[act[1]] = id
            elif act[0] == 5:
                for o in obj.datas.values():
                    if o[self._fields_id] == id:
                        o[self._fields_id] = False
            elif act[0] == 6:
                for id2 in (act[2] or []):
                    obj.datas[id2][self._fields_id] = id

    def search_memory(self, cr, obj, args, name, value, offset=0, limit=None, uid=None, operator='like', context=None):
        raise _('Not Implemented')

    def get(self, cr, obj, ids, name, user=None, offset=0, context=None, values=None):
        if not context:
            context = {}
        if not values:
            values = {}
        res = {}
        for id in ids:
            res[id] = []
        ids2 = obj.pool.get(self._obj).search(cr, user, [(self._fields_id, 'in', ids)], limit=self._limit)
        for r in obj.pool.get(self._obj)._read_flat(cr, user, ids2, [self._fields_id], context=context, load='_classic_write'):
            res[r[self._fields_id]].append(r['id'])
        return res

    def set(self, cr, obj, id, field, values, user=None, context=None):
        if not context:
            context = {}
        if not values:
            return
        _table = obj.pool.get(self._obj)._table
        obj = obj.pool.get(self._obj)
        for act in values:
            if act[0] == 0:
                act[2][self._fields_id] = id
                obj.create(cr, user, act[2], context=context)
            elif act[0] == 1:
                obj.write(cr, user, [act[1]], act[2], context=context)
            elif act[0] == 2:
                obj.unlink(cr, user, [act[1]], context=context)
            elif act[0] == 3:
                cr.execute('update '+_table+' set '+self._fields_id+'=null where id=%s', (act[1],))
            elif act[0] == 4:
                cr.execute('update '+_table+' set '+self._fields_id+'=%s where id=%s', (id, act[1]))
            elif act[0] == 5:
                cr.execute('update '+_table+' set '+self._fields_id+'=null where '+self._fields_id+'=%s', (id,))
            elif act[0] == 6:
                if not act[2]:
                    ids2 = [0]
                else:
                    ids2 = act[2]
                cr.execute('update '+_table+' set '+self._fields_id+'=NULL where '+self._fields_id+'=%s and id not in ('+','.join(map(str, ids2))+')', (id,))
                if act[2]:
                    cr.execute('update '+_table+' set '+self._fields_id+'=%s where id in ('+','.join(map(str, act[2]))+')', (id,))

    def search(self, cr, obj, args, name, value, offset=0, limit=None, uid=None, operator='like'):
        return obj.pool.get(self._obj).name_search(cr, uid, value, self._domain, offset, limit)


#
# Values: (0, 0,  { fields })    create
#         (1, ID, { fields })    modification
#         (2, ID)                remove
#         (3, ID)                unlink
#         (4, ID)                link
#         (5, ID)                unlink all
#         (6, ?, ids)            set a list of links
#
class many2many(_column):
    _classic_read = False
    _classic_write = False
    _type = 'many2many'

    def __init__(self, obj, rel, id1, id2, string='unknown', limit=None, **args):
        _column.__init__(self, string=string, **args)
        self._obj = obj
        if '.' in rel:
            raise Exception(_('The second argument of the many2many field %s must be a SQL table !'\
                'You used %s, which is not a valid SQL table name.')% (string,rel))
        self._rel = rel
        self._id1 = id1
        self._id2 = id2
        self._limit = limit

    def get(self, cr, obj, ids, name, user=None, offset=0, context=None, values=None):
        if not context:
            context = {}
        if not values:
            values = {}
        res = {}
        if not ids:
            return res
        for id in ids:
            res[id] = []
        ids_s = ','.join(map(str, ids))
        limit_str = self._limit is not None and ' limit %d' % self._limit or ''
        obj = obj.pool.get(self._obj)

        d1, d2 = obj.pool.get('ir.rule').domain_get(cr, user, obj._name)
        if d1:
            d1 = ' and ' + d1

        cr.execute('SELECT '+self._rel+'.'+self._id2+','+self._rel+'.'+self._id1+' \
                FROM '+self._rel+' , '+obj._table+' \
                WHERE '+self._rel+'.'+self._id1+' in ('+ids_s+') \
                    AND '+self._rel+'.'+self._id2+' = '+obj._table+'.id '+d1
                +limit_str+' order by '+obj._table+'.'+obj._order+' offset %s',
                d2+[offset])
        for r in cr.fetchall():
            res[r[1]].append(r[0])
        return res

    def set(self, cr, obj, id, name, values, user=None, context=None):
        if not context:
            context = {}
        if not values:
            return
        obj = obj.pool.get(self._obj)
        for act in values:
            if act[0] == 0:
                idnew = obj.create(cr, user, act[2])
                cr.execute('insert into '+self._rel+' ('+self._id1+','+self._id2+') values (%s,%s)', (id, idnew))
            elif act[0] == 1:
                obj.write(cr, user, [act[1]], act[2], context=context)
            elif act[0] == 2:
                obj.unlink(cr, user, [act[1]], context=context)
            elif act[0] == 3:
                cr.execute('delete from '+self._rel+' where ' + self._id1 + '=%s and '+ self._id2 + '=%s', (id, act[1]))
            elif act[0] == 4:
                cr.execute('insert into '+self._rel+' ('+self._id1+','+self._id2+') values (%s,%s)', (id, act[1]))
            elif act[0] == 5:
                cr.execute('update '+self._rel+' set '+self._id2+'=null where '+self._id2+'=%s', (id,))
            elif act[0] == 6:

                d1, d2 = obj.pool.get('ir.rule').domain_get(cr, user, obj._name)
                if d1:
                    d1 = ' and ' + d1
                cr.execute('delete from '+self._rel+' where '+self._id1+'=%s AND '+self._id2+' IN (SELECT '+self._rel+'.'+self._id2+' FROM '+self._rel+', '+obj._table+' WHERE '+self._rel+'.'+self._id1+'=%s AND '+self._rel+'.'+self._id2+' = '+obj._table+'.id '+ d1 +')', [id, id]+d2)

                for act_nbr in act[2]:
                    cr.execute('insert into '+self._rel+' ('+self._id1+','+self._id2+') values (%s, %s)', (id, act_nbr))

    #
    # TODO: use a name_search
    #
    def search(self, cr, obj, args, name, value, offset=0, limit=None, uid=None, operator='like'):
        return obj.pool.get(self._obj).search(cr, uid, args+self._domain+[('name', operator, value)], offset, limit)

    def get_memory(self, cr, obj, ids, name, user=None, offset=0, context=None, values=None):
        result = {}
        for id in ids:
            result[id] = obj.datas[id].get(name, [])
        return result

    def set_memory(self, cr, obj, id, name, values, user=None, context=None):
        if not values:
            return
        for act in values:
            # TODO: use constants instead of these magic numbers
            if act[0] == 0:
                raise _('Not Implemented')
            elif act[0] == 1:
                raise _('Not Implemented')
            elif act[0] == 2:
                raise _('Not Implemented')
            elif act[0] == 3:
                raise _('Not Implemented')
            elif act[0] == 4:
                raise _('Not Implemented')
            elif act[0] == 5:
                raise _('Not Implemented')
            elif act[0] == 6:
                obj.datas[id][name] = act[2]


# ---------------------------------------------------------
# Function fields
# ---------------------------------------------------------
class function(_column):
    _classic_read = False
    _classic_write = False
    _type = 'function'
    _properties = True

#
# multi: compute several fields in one call
#
    def __init__(self, fnct, arg=None, fnct_inv=None, fnct_inv_arg=None, type='float', fnct_search=None, obj=None, method=False, store=False, multi=False, **args):
        _column.__init__(self, **args)
        self._obj = obj
        self._method = method
        self._fnct = fnct
        self._fnct_inv = fnct_inv
        self._arg = arg
        self._multi = multi
        if 'relation' in args:
            self._obj = args['relation']
        self._fnct_inv_arg = fnct_inv_arg
        if not fnct_inv:
            self.readonly = 1
        self._type = type
        self._fnct_search = fnct_search
        self.store = store
        if store:
            self._classic_read = True
            self._classic_write = True
            if type=='binary':
                self._symbol_get=lambda x:x and str(x)

        if type == 'float':
            self._symbol_c = float._symbol_c
            self._symbol_f = float._symbol_f
            self._symbol_set = float._symbol_set

    def search(self, cr, uid, obj, name, args):
        if not self._fnct_search:
            #CHECKME: should raise an exception
            return []
        return self._fnct_search(obj, cr, uid, obj, name, args)

    def get(self, cr, obj, ids, name, user=None, context=None, values=None):
        if not context:
            context = {}
        if not values:
            values = {}
        res = {}
        if self._method:
            res = self._fnct(obj, cr, user, ids, name, self._arg, context)
        else:
            res = self._fnct(cr, obj._table, ids, name, self._arg, context)

        if self._type == 'binary' and context.get('bin_size', False):
            # convert the data returned by the function with the size of that data...
            res = dict(map(lambda (x, y): (x, tools.human_size(len(y))), res.items()))
        return res

    def set(self, cr, obj, id, name, value, user=None, context=None):
        if not context:
            context = {}
        if self._fnct_inv:
            self._fnct_inv(obj, cr, user, id, name, value, self._fnct_inv_arg, context)

# ---------------------------------------------------------
# Related fields
# ---------------------------------------------------------

class related(function):

    def _fnct_search(self, tobj, cr, uid, obj=None, name=None, domain=None, context={}):
        self._field_get2(cr, uid, obj, context)
        i = len(self._arg)-1
        sarg = name
        while i>0:
            if type(sarg) in [type([]), type( (1,) )]:
                where = [(self._arg[i], 'in', sarg)]
            else:
                where = [(self._arg[i], '=', sarg)]
            if domain:
                where = map(lambda x: (self._arg[i],x[1], x[2]), domain)
                domain = []
            sarg = obj.pool.get(self._relations[i]['object']).search(cr, uid, where, context=context)
            i -= 1
        return [(self._arg[0], 'in', sarg)]

    def _fnct_write(self,obj,cr, uid, ids, field_name, values, args, context=None):
        if values and field_name:
            self._field_get2(cr, uid, obj, context)
            relation = obj._name
            res = {}
            if type(ids) != type([]):
                ids=[ids]
            objlst = obj.browse(cr, uid, ids)
            for data in objlst:
                t_id=None
                t_data = data
                relation = obj._name
                for i in range(len(self.arg)):
                    field_detail = self._relations[i]
                    relation = field_detail['object']
                    if not t_data[self.arg[i]]:
                        t_data = False
                        break
                    if field_detail['type'] in ('one2many', 'many2many'):
                        t_id=t_data.id
                        t_data = t_data[self.arg[i]][0]
                    else:
                        t_id=t_data['id']
                        t_data = t_data[self.arg[i]]
                if t_id:
                    obj.pool.get(field_detail['object']).write(cr,uid,[t_id],{args[-1]:values})

    def _fnct_read(self, obj, cr, uid, ids, field_name, args, context=None):
        self._field_get2(cr, uid, obj, context)
        if not ids: return {}
        relation = obj._name
        res = {}.fromkeys(ids, False)
        objlst = obj.browse(cr, uid, ids)
        for data in objlst:
            if not data:
                continue
            t_data = data
            relation = obj._name
            for i in range(len(self.arg)):
                field_detail = self._relations[i]
                relation = field_detail['object']
                try:
                    if not t_data[self.arg[i]]:
                        t_data = False
                        break
                except:
                    t_data = False
                    break
                if field_detail['type'] in ('one2many', 'many2many'):
                    t_data = t_data[self.arg[i]][0]
                else:
                    t_data = t_data[self.arg[i]]
            if type(t_data) == type(objlst[0]):
                res[data.id] = t_data.id
            else:
                res[data.id] = t_data

        if self._type=='many2one':
            ids = filter(None, res.values())
            if ids:
                ng = dict(obj.pool.get(self._obj).name_get(cr, uid, ids, context=context))
                for r in res:
                    if res[r]:
                        res[r] = (res[r], ng[res[r]])
        return res

    def __init__(self, *arg, **args):
        self.arg = arg
        self._relations = []
        super(related, self).__init__(self._fnct_read, arg, self._fnct_write, fnct_inv_arg=arg, method=True, fnct_search=self._fnct_search, **args)

    def _field_get2(self, cr, uid, obj, context={}):
        if self._relations:
            return
        obj_name = obj._name
        for i in range(len(self._arg)):
            f = obj.pool.get(obj_name).fields_get(cr, uid, [self._arg[i]], context=context)[self._arg[i]]
            self._relations.append({
                'object': obj_name,
                'type': f['type']

            })
            if f.get('relation',False):
                obj_name = f['relation']
                self._relations[-1]['relation'] = f['relation']

# ---------------------------------------------------------
# Serialized fields
# ---------------------------------------------------------
class serialized(_column):
    def __init__(self, string='unknown', serialize_func=repr, deserialize_func=eval, type='text', **args):
        self._serialize_func = serialize_func
        self._deserialize_func = deserialize_func
        self._type = type
        self._symbol_set = (self._symbol_c, self._serialize_func)
        self._symbol_get = self._deserialize_func
        super(serialized, self).__init__(string=string, **args)


class property(function):

    def _fnct_write(self, obj, cr, uid, id, prop, id_val, val, context=None):
        if not context:
            context = {}
        (obj_dest,) = val
        definition_id = self._field_get(cr, uid, obj._name, prop)

        property = obj.pool.get('ir.property')
        nid = property.search(cr, uid, [('fields_id', '=', definition_id),
            ('res_id', '=', obj._name+','+str(id))])
        while len(nid):
            cr.execute('DELETE FROM ir_property WHERE id=%s', (nid.pop(),))

        nid = property.search(cr, uid, [('fields_id', '=', definition_id),
            ('res_id', '=', False)])
        default_val = False
        if nid:
            default_val = property.browse(cr, uid, nid[0], context).value

        company_id = obj.pool.get('res.users').company_get(cr, uid, uid)
        res = False
        newval = (id_val and obj_dest+','+str(id_val)) or False
        if (newval != default_val) and newval:
            propdef = obj.pool.get('ir.model.fields').browse(cr, uid,
                    definition_id, context=context)
            res = property.create(cr, uid, {
                'name': propdef.name,
                'value': newval,
                'res_id': obj._name+','+str(id),
                'company_id': company_id,
                'fields_id': definition_id
            }, context=context)
        return res

    def _fnct_read(self, obj, cr, uid, ids, prop, val, context=None):
        if not context:
            context = {}
        property = obj.pool.get('ir.property')
        definition_id = self._field_get(cr, uid, obj._name, prop)

        nid = property.search(cr, uid, [('fields_id', '=', definition_id),
            ('res_id', '=', False)])
        default_val = False
        if nid:
            d = property.browse(cr, uid, nid[0], context).value
            default_val = (d and int(d.split(',')[1])) or False

        vids = [obj._name + ',' + str(id) for id in  ids]
        nids = property.search(cr, uid, [('fields_id', '=', definition_id),
            ('res_id', 'in', vids)])

        res = {}
        for id in ids:
            res[id] = default_val
        for prop in property.browse(cr, uid, nids):
            res[int(prop.res_id.split(',')[1])] = (prop.value and \
                    int(prop.value.split(',')[1])) or False

        obj = obj.pool.get(self._obj)
        names = dict(obj.name_get(cr, uid, filter(None, res.values()), context))
        for r in res.keys():
            if res[r] and res[r] in names:
                res[r] = (res[r], names[res[r]])
            else:
                res[r] = False
        return res

    def _field_get(self, cr, uid, model_name, prop):
        if not self.field_id.get(cr.dbname):
            cr.execute('SELECT id \
                    FROM ir_model_fields \
                    WHERE name=%s AND model=%s', (prop, model_name))
            res = cr.fetchone()
            self.field_id[cr.dbname] = res and res[0]
        return self.field_id[cr.dbname]

    def __init__(self, obj_prop, **args):
        self.field_id = {}
        function.__init__(self, self._fnct_read, False, self._fnct_write,
                (obj_prop, ), **args)

    def restart(self):
        self.field_id = {}


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