# Copyright (c) 2012 OpenStack, LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from sqlalchemy.ext import declarative
from sqlalchemy import orm


class QuantumBase(object):
    """Base class for Quantum Models."""

    def __setitem__(self, key, value):
        setattr(self, key, value)

    def __getitem__(self, key):
        return getattr(self, key)

    def get(self, key, default=None):
        return getattr(self, key, default)

    def __iter__(self):
        self._i = iter(orm.object_mapper(self).columns)
        return self

    def next(self):
        n = self._i.next().name
        return n, getattr(self, n)

    def update(self, values):
        """Make the model object behave like a dict"""
        for k, v in values.iteritems():
            setattr(self, k, v)

    def iteritems(self):
        """Make the model object behave like a dict.
        Includes attributes from joins."""
        local = dict(self)
        joined = dict([(k, v) for k, v in self.__dict__.iteritems()
                       if not k[0] == '_'])
        local.update(joined)
        return local.iteritems()

    def __repr__(self):
        """sqlalchemy based automatic __repr__ method"""
        items = ['%s=%r' % (col.name, getattr(self, col.name))
                 for col in self.__table__.columns]
        return "<%s.%s[object at %x] {%s}>" % (self.__class__.__module__,
                                               self.__class__.__name__,
                                               id(self), ', '.join(items))


class QuantumBaseV2(QuantumBase):

    @declarative.declared_attr
    def __tablename__(cls):
        # NOTE(jkoelker) use the pluralized name of the class as the table
        return cls.__name__.lower() + 's'


BASEV2 = declarative.declarative_base(cls=QuantumBaseV2)