class Coordinates(object):

    def __init__(self, lng, lat):
        super(Coordinates, self).__init__()
        self.lng = float(lng)
        self.lat = float(lat)

    def to_sql(self):
        return "GeomFromText('POINT(%s %s)')" % (self.lng, self.lat)

    def __unicode__(self):
        return 'Coordinates(lat=%s, lng=%s)' % (self.lat, self.lng)

    @staticmethod
    def to_python(value):
        return Coordinates(0, 0)# value
        lat = None
        lng = None

        if isinstance(value, (list, tuple)):
            lat, lng = value
            return Coordinates(lat, lng)

        if isinstance(value, (str, unicode)):
            lat, lng = value.split(' ')
            return Coordinates(lat, lng)


class GeometryField(models.Field):

    __metaclass__ = models.SubfieldBase

    def __init__(self,  *args, **kwargs):
        #self.max_length = 68
        super(GeometryField, self).__init__(*args, **kwargs)
        self.spatial = True

    def db_type(self, connection):
        return 'GEOMETRY'

    def to_python(self, value):
        if isinstance(value, Coordinates):
            return value

        return Coordinates.to_python(value)

    def get_prep_value(self, value):
        return self.to_python(value)

    def get_db_prep_save(self, value, connection):
        return self.to_python(value).to_sql()

    def value_to_string(self, obj):
        value = self._get_val_from_obj(obj)
        return self.get_db_prep_value(value)