import urllib, urllib2

class SmsModel(object):
    """models.Model extender"""
    prefix = 'get_payable_'
    
    def __getattr__(self, name):
        if (name.startswith(self.prefix)):
            field = name[len(self.prefix):]

            return self._get_payable(field)
        else:
            return object.__getattr__(self, name)

    def smskey_init(self, key_id, request):
        self.key_id = key_id
        self.request = request

    def _get_payable(self, field):
        if (field in self.SmsKey.payable_fields):
            
            try:
                params = {'s_key' : self.key_id,
                          's_language' :  self.request.GET.get('s_language', self.request.POST.get('s_language', '')),
                          's_pair' :  self.request.GET.get('s_pair', self.request.POST.get('s_pair', '')),
                          's_ip' :  self.request.META['REMOTE_ADDR'],
                          's_pure' : 1,
                          's_enc' : 'utf-8',
                          }
                
            except Exception, message:
                params = {}

            opener = urllib2.Request("http://service.smscoin.com/key/?%s&s_url=%s%s" % (urllib.urlencode(params), self.request.META['HTTP_HOST'], urllib.quote("%s?%s" % (self.request.path, self.request.META['QUERY_STRING']))),
                                     headers = {'User-agent': 'smscoin_key_1.0.6'})
            
            try:
                response = urllib2.urlopen(opener).read()
                error = None
            except:
                response = ""
                error = u"Can't connect to smscoin.com to check key."

            if (response[:4] == 'true'):
                return self.__dict__[field]
            elif (error):
                return error
            else:
                return response.decode('utf-8')
                
            
        else:
            raise KeyError('Field %s is not marked as payable' % field)