# -*- encoding: utf-8 -*-
#
# Copyright 2013 Hewlett-Packard Development Company, L.P.
#
#    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.

"""
SQLAlchemy models for baremetal data.
"""

import json

from oslo.config import cfg
import six.moves.urllib.parse as urlparse

from sqlalchemy import Boolean, Column, DateTime
from sqlalchemy import ForeignKey, Integer, Index
from sqlalchemy import schema, String, Text
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.types import TypeDecorator, TEXT

from ironic.openstack.common.db.sqlalchemy import models

sql_opts = [
    cfg.StrOpt('mysql_engine',
               default='InnoDB',
               help='MySQL engine to use.')
]

cfg.CONF.register_opts(sql_opts, 'database')


def table_args():
    engine_name = urlparse.urlparse(cfg.CONF.database_connection).scheme
    if engine_name == 'mysql':
        return {'mysql_engine': cfg.CONF.mysql_engine,
                'mysql_charset': "utf8"}
    return None


class JsonEncodedType(TypeDecorator):
    """Abstract base type serialized as json-encoded string in db."""
    type = None
    impl = TEXT

    def process_bind_param(self, value, dialect):
        if value is None:
            # Save default value according to current type to keep the
            # interface the consistent.
            value = self.type()
        elif not isinstance(value, self.type):
            raise TypeError("%s supposes to store %s objects, but %s given"
                            % (self.__class__.__name__,
                               self.type.__name__,
                               type(value).__name__))
        serialized_value = json.dumps(value)
        return serialized_value

    def process_result_value(self, value, dialect):
        if value is not None:
            value = json.loads(value)
        return value


class JSONEncodedDict(JsonEncodedType):
    """Represents dict serialized as json-encoded string in db."""
    type = dict


class JSONEncodedList(JsonEncodedType):
    """Represents list serialized as json-encoded string in db."""
    type = list


class IronicBase(models.TimestampMixin,
                 models.ModelBase):

    metadata = None

    def as_dict(self):
        d = {}
        for c in self.__table__.columns:
            d[c.name] = self[c.name]
        return d

    def save(self, session=None):
        import ironic.db.sqlalchemy.api as db_api

        if session is None:
            session = db_api.get_session()

        super(IronicBase, self).save(session)

Base = declarative_base(cls=IronicBase)


class Chassis(Base):
    """Represents a hardware chassis."""

    __tablename__ = 'chassis'
    __table_args__ = (
        schema.UniqueConstraint('uuid', name='uniq_chassis0uuid'),
        )
    id = Column(Integer, primary_key=True)
    uuid = Column(String(36))
    extra = Column(JSONEncodedDict)
    description = Column(String(255), nullable=True)


class Conductor(Base):
    """Represents a conductor service entry."""

    __tablename__ = 'conductors'
    __table_args__ = (
        schema.UniqueConstraint('hostname', name='uniq_conductors0hostname'),
        )
    id = Column(Integer, primary_key=True)
    hostname = Column(String(255), nullable=False)
    drivers = Column(JSONEncodedList)


class Node(Base):
    """Represents a bare metal node."""

    __tablename__ = 'nodes'
    __table_args__ = (
        schema.UniqueConstraint('uuid', name='uniq_nodes0uuid'),
        Index('node_instance_uuid', 'instance_uuid'))
    id = Column(Integer, primary_key=True)
    uuid = Column(String(36))
    # NOTE(deva): we store instance_uuid directly on the node so that we can
    #             filter on it more efficiently, even though it is
    #             user-settable, and would otherwise be in node.properties.
    instance_uuid = Column(String(36), nullable=True)
    chassis_id = Column(Integer, ForeignKey('chassis.id'), nullable=True)
    power_state = Column(String(15), nullable=True)
    target_power_state = Column(String(15), nullable=True)
    provision_state = Column(String(15), nullable=True)
    target_provision_state = Column(String(15), nullable=True)
    provision_updated_at = Column(DateTime, nullable=True)
    last_error = Column(Text, nullable=True)
    instance_info = Column(JSONEncodedDict)
    properties = Column(JSONEncodedDict)
    driver = Column(String(15))
    driver_info = Column(JSONEncodedDict)
    reservation = Column(String(255), nullable=True)
    maintenance = Column(Boolean, default=False)
    console_enabled = Column(Boolean, default=False)
    extra = Column(JSONEncodedDict)


class Port(Base):
    """Represents a network port of a bare metal node."""

    __tablename__ = 'ports'
    __table_args__ = (
        schema.UniqueConstraint('address', name='uniq_ports0address'),
        schema.UniqueConstraint('uuid', name='uniq_ports0uuid'))
    id = Column(Integer, primary_key=True)
    uuid = Column(String(36))
    address = Column(String(18))
    node_id = Column(Integer, ForeignKey('nodes.id'), nullable=True)
    extra = Column(JSONEncodedDict)
