# Copyright (C) 2021 Mandiant, Inc. 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: [package root]/LICENSE.txt
# 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.
import time
import inspect
import contextlib
import collections

# this structure is unstable and may change before the next major release.
counters: collections.Counter[str] = collections.Counter()


def reset():
    global counters
    counters = collections.Counter()


@contextlib.contextmanager
def timing(msg: str):
    """log the given message start/stop and time taken, using the caller's `logger` instance."""
    # stack:
    #   0: here
    #   1: contextlib
    #   2: caller
    caller = inspect.stack()[2]
    caller_logger = caller.frame.f_globals.get("logger")

    caller_logger.debug("%s...", msg)
    t0 = time.time()
    yield
    t1 = time.time()
    caller_logger.debug("%s done in %0.1fs.", msg, t1 - t0)
