# Copyright 2011 OpenStack LLC.
# All Rights Reserved.
#
#    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.
"""
Fakes For Scheduler tests.
"""

from nova import db
from nova.scheduler import distributed_scheduler
from nova.scheduler import host_manager
from nova.scheduler import zone_manager


COMPUTE_NODES = [
        dict(id=1, local_gb=1024, memory_mb=1024, service=dict(host='host1')),
        dict(id=2, local_gb=2048, memory_mb=2048, service=dict(host='host2')),
        dict(id=3, local_gb=4096, memory_mb=4096, service=dict(host='host3')),
        dict(id=4, local_gb=8192, memory_mb=8192, service=dict(host='host4')),
        # Broken entry
        dict(id=5, local_gb=1024, memory_mb=1024, service=None),
]

INSTANCES = [
        dict(local_gb=512, memory_mb=512, host='host1'),
        dict(local_gb=512, memory_mb=512, host='host2'),
        dict(local_gb=512, memory_mb=512, host='host2'),
        dict(local_gb=1024, memory_mb=1024, host='host3'),
        # Broken host
        dict(local_gb=1024, memory_mb=1024, host=None),
        # No matching host
        dict(local_gb=1024, memory_mb=1024, host='host5'),
]


class FakeDistributedScheduler(distributed_scheduler.DistributedScheduler):
    def __init__(self, *args, **kwargs):
        super(FakeDistributedScheduler, self).__init__(*args, **kwargs)
        self.zone_manager = zone_manager.ZoneManager()
        self.host_manager = host_manager.HostManager()


class FakeHostManager(host_manager.HostManager):
    """host1: free_ram_mb=1024-512-512=0, free_disk_gb=1024-512-512=0
       host2: free_ram_mb=2048-512=1536  free_disk_gb=2048-512=1536
       host3: free_ram_mb=4096-1024=3072  free_disk_gb=4096-1024=3072
       host4: free_ram_mb=8192  free_disk_gb=8192"""

    def __init__(self):
        super(FakeHostManager, self).__init__()

        self.service_states = {
            'host1': {
                'compute': {'host_memory_free': 1073741824},
            },
            'host2': {
                'compute': {'host_memory_free': 2147483648},
            },
            'host3': {
                'compute': {'host_memory_free': 3221225472},
            },
            'host4': {
                'compute': {'host_memory_free': 999999999},
            },
        }

    def get_host_list_from_db(self, context):
        return [
            ('host1', dict(free_disk_gb=1024, free_ram_mb=1024)),
            ('host2', dict(free_disk_gb=2048, free_ram_mb=2048)),
            ('host3', dict(free_disk_gb=4096, free_ram_mb=4096)),
            ('host4', dict(free_disk_gb=8192, free_ram_mb=8192)),
        ]


class FakeHostState(host_manager.HostState):
    def __init__(self, host, topic, attribute_dict):
        super(FakeHostState, self).__init__(host, topic)
        for (key, val) in attribute_dict.iteritems():
            setattr(self, key, val)


def mox_host_manager_db_calls(mox, context):
    mox.StubOutWithMock(db, 'compute_node_get_all')
    mox.StubOutWithMock(db, 'instance_get_all')

    db.compute_node_get_all(context).AndReturn(COMPUTE_NODES)
    db.instance_get_all(context).AndReturn(INSTANCES)