""" this is forms validation classes
http://formencode.org/module-formencode.validators.html
for list off all availible validators

we can create our own validators

The table below outlines the options which can be used in a schema in addition to the validators themselves
pre_validators          []     These validators will be applied before the schema
chained_validators      []     These validators will be applied after the schema
allow_extra_fields      False     If True, then it is not an error when keys that aren't associated with a validator are present
filter_extra_fields     False     If True, then keys that aren't associated with a validator are removed
if_key_missing          NoDefault If this is given, then any keys that aren't available but are expected will be replaced with this value (and then validated). This does not override a present .if_missing attribute on validators. NoDefault is a special FormEncode class to mean that no default values has been specified and therefore missing keys shouldn't take a default value.
ignore_key_missing      False     If True, then missing keys will be missing in the result, if the validator doesn't have .if_missing on it already    
  
  
<name> = formencode.validators.<name of validator>
<name> must equal form name
list=[1,2,3,4,5]
for select use formencode.All(OneOf(list), Int())
    
"""

import formencode
from formencode.validators import UnicodeString, OneOf, Int, Number, Regex
from pylons.i18n.translation import _
from webhelpers.pylonslib.secure_form import authentication_token

class ValidAuthToken(formencode.validators.FancyValidator):
    messages = {'invalid_token':_('Token mismatch')}

    def validate_python(self, value, state):

        if value != authentication_token():
            raise formencode.Invalid(self.message('invalid_token', state, search_number = value), value, state)


class WireTransferForm(object):
    '''
    A factory wrapper class. It might return the instance of class for a validation, but also it can
    return the list for select fields values.
    @param ret_type: type to return defaut: 'class'
    '''
    #class attributes here
    #it might be fetched from db,from models and so on
    recipients_list = [
                       (1, 'a'),
                       (2, 'b')
                       ]

    def _form(self):
        class _WireTransferForm(formencode.Schema):
            allow_extra_fields = True
            _authentication_token = ValidAuthToken()
            account_number = Regex(r'[0-9]{26}', not_empty = True, messages = {
                                                'invalid': _("Account number is invalid, it must be 26 digits")})
            title = UnicodeString(not_empty = True, min = 3, strip = True)
            recipient = formencode.All(OneOf([i[0] for i in WireTransferForm.recipients_list],
                                             testValueList = True, hideList = True), Int())
            recipient_address = UnicodeString(not_empty = True, strip = True)
            amount = Number(not_empty = True, min = 1)

        return _WireTransferForm()