# 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.

"""Cluster object."""

from oslo_utils import timeutils
from oslo_utils import uuidutils

from senlin.common import exception as exc
from senlin.common import utils
from senlin.db import api as db_api
from senlin.objects import base
from senlin.objects import fields


@base.SenlinObjectRegistry.register
class Cluster(base.SenlinObject, base.VersionedObjectDictCompat):
    """Senlin cluster object."""

    fields = {
        'id': fields.UUIDField(),
        'name': fields.StringField(),
        'profile_id': fields.UUIDField(),
        'parent': fields.UUIDField(nullable=True),
        'init_at': fields.DateTimeField(),
        'created_at': fields.DateTimeField(nullable=True),
        'updated_at': fields.DateTimeField(nullable=True),
        'min_size': fields.IntegerField(nullable=True),
        'max_size': fields.IntegerField(nullable=True),
        'desired_capacity': fields.IntegerField(nullable=True),
        'next_index': fields.IntegerField(nullable=True),
        'timeout': fields.IntegerField(nullable=True),
        'status': fields.StringField(),
        'status_reason': fields.StringField(nullable=True),
        'metadata': fields.JsonField(nullable=True),
        'data': fields.JsonField(nullable=True),
        'user': fields.StringField(),
        'project': fields.StringField(),
        'domain': fields.StringField(nullable=True),
        'dependents': fields.JsonField(nullable=True),
        'config': fields.JsonField(nullable=True),
        'profile_name': fields.StringField(),
        'nodes': fields.CustomListField(attr_name='id', nullable=True),
        'policies': fields.CustomListField(attr_name='id', nullable=True),
    }

    @staticmethod
    def _from_db_object(context, obj, db_obj):
        if db_obj is None:
            return None
        for field in obj.fields:
            if field == 'metadata':
                obj['metadata'] = db_obj['meta_data']
            elif field == 'profile_name':
                obj['profile_name'] = db_obj['profile'].name
            else:
                obj[field] = db_obj[field]

        obj._context = context
        obj.obj_reset_changes()

        return obj

    @classmethod
    def create(cls, context, values):
        values = cls._transpose_metadata(values)
        values['init_at'] = timeutils.utcnow(True)
        obj = db_api.cluster_create(context, values)
        return cls._from_db_object(context, cls(), obj)

    @classmethod
    def find(cls, context, identity, project_safe=True):
        cluster = None
        if uuidutils.is_uuid_like(identity):
            cluster = cls.get(context, identity, project_safe=project_safe)
            if not cluster:
                cluster = cls.get_by_name(context, identity,
                                          project_safe=project_safe)
        else:
            cluster = cls.get_by_name(context, identity,
                                      project_safe=project_safe)
            # maybe it is a short form of UUID
            if not cluster:
                cluster = cls.get_by_short_id(context, identity,
                                              project_safe=project_safe)

        if not cluster:
            raise exc.ResourceNotFound(type='cluster', id=identity)

        return cluster

    @classmethod
    def get(cls, context, cluster_id, **kwargs):
        obj = db_api.cluster_get(context, cluster_id, **kwargs)
        return cls._from_db_object(context, cls(), obj)

    @classmethod
    def get_by_name(cls, context, name, **kwargs):
        obj = db_api.cluster_get_by_name(context, name, **kwargs)
        return cls._from_db_object(context, cls(), obj)

    @classmethod
    def get_by_short_id(cls, context, short_id, **kwargs):
        obj = db_api.cluster_get_by_short_id(context, short_id, **kwargs)
        return cls._from_db_object(context, cls(), obj)

    @classmethod
    def get_all(cls, context, **kwargs):
        objs = db_api.cluster_get_all(context, **kwargs)
        return [cls._from_db_object(context, cls(), obj) for obj in objs]

    @classmethod
    def get_next_index(cls, context, cluster_id):
        return db_api.cluster_next_index(context, cluster_id)

    @classmethod
    def count_all(cls, context, **kwargs):
        return db_api.cluster_count_all(context, **kwargs)

    @classmethod
    def update(cls, context, obj_id, values):
        values = cls._transpose_metadata(values)
        values['updated_at'] = timeutils.utcnow(True)
        return db_api.cluster_update(context, obj_id, values)

    @classmethod
    def delete(cls, context, obj_id):
        db_api.cluster_delete(context, obj_id)

    def to_dict(self):
        return {
            'id': self.id,
            'name': self.name,
            'profile_id': self.profile_id,
            'user': self.user,
            'project': self.project,
            'domain': self.domain,
            'init_at': utils.isotime(self.init_at),
            'created_at': utils.isotime(self.created_at),
            'updated_at': utils.isotime(self.updated_at),
            'min_size': self.min_size,
            'max_size': self.max_size,
            'desired_capacity': self.desired_capacity,
            'timeout': self.timeout,
            'status': self.status,
            'status_reason': self.status_reason,
            'metadata': self.metadata or {},
            'data': self.data or {},
            'dependents': self.dependents or {},
            'config': self.config or {},
            'profile_name': self.profile_name,
            'nodes': self.nodes,
            'policies': self.policies
        }
