# Copyright 2017, Google 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.

from __future__ import absolute_import
import collections
import psutil
import sys

from google.api_core.protobuf_helpers import get_messages

from google.api import http_pb2
from google.cloud.pubsub_v1.proto import pubsub_pb2
from google.iam.v1 import iam_policy_pb2
from google.iam.v1 import policy_pb2
from google.iam.v1.logging import audit_data_pb2
from google.protobuf import descriptor_pb2
from google.protobuf import duration_pb2
from google.protobuf import empty_pb2
from google.protobuf import field_mask_pb2
from google.protobuf import timestamp_pb2


# Define the default values for batching.
#
# This class is used when creating a publisher or subscriber client, and
# these settings can be altered to tweak Pub/Sub behavior.
# The defaults should be fine for most use cases.
BatchSettings = collections.namedtuple(
    'BatchSettings',
    ['max_bytes', 'max_latency', 'max_messages'],
)
BatchSettings.__new__.__defaults__ = (
    1024 * 1024 * 10,  # max_bytes: 10 MB
    0.05,              # max_latency: 0.05 seconds
    1000,              # max_messages: 1,000
)

# Define the type class and default values for flow control settings.
#
# This class is used when creating a publisher or subscriber client, and
# these settings can be altered to tweak Pub/Sub behavior.
# The defaults should be fine for most use cases.
FlowControl = collections.namedtuple(
    'FlowControl',
    ['max_bytes', 'max_messages', 'resume_threshold', 'max_requests'],
)
FlowControl.__new__.__defaults__ = (
    psutil.virtual_memory().total * 0.2,  # max_bytes: 20% of total RAM
    float('inf'),                         # max_messages: no limit
    0.8,                                  # resume_threshold: 80%
    100,                                  # max_requests: 100
)


names = ['BatchSettings', 'FlowControl']
for name, message in get_messages(pubsub_pb2).items():
    message.__module__ = 'google.cloud.pubsub_v1.types'
    setattr(sys.modules[__name__], name, message)
    names.append(name)


for module in (
        http_pb2,
        pubsub_pb2,
        iam_policy_pb2,
        policy_pb2,
        audit_data_pb2,
        descriptor_pb2,
        duration_pb2,
        empty_pb2,
        field_mask_pb2,
        timestamp_pb2, ):
    for name, message in get_messages(module).items():
        message.__module__ = 'google.cloud.pubsub_v1.types'
        setattr(sys.modules[__name__], name, message)
        names.append(name)


__all__ = tuple(sorted(names))
