#!/usr/bin/env python

# Copyright 2024 The HuggingFace Inc. team.
# 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.

import logging
import signal
import sys
from queue import Empty

from torch.multiprocessing import Queue

shutdown_event_counter = 0


def setup_process_handlers(use_threads: bool) -> any:
    if use_threads:
        from threading import Event
    else:
        from multiprocessing import Event

    shutdown_event = Event()

    # Define signal handler
    def signal_handler(signum, frame):
        logging.info("Shutdown signal received. Cleaning up...")
        shutdown_event.set()
        global shutdown_event_counter
        shutdown_event_counter += 1

        if shutdown_event_counter > 1:
            logging.info("Force shutdown")
            sys.exit(1)

    signal.signal(signal.SIGINT, signal_handler)  # Ctrl+C
    signal.signal(signal.SIGTERM, signal_handler)  # Termination request (kill)
    signal.signal(signal.SIGHUP, signal_handler)  # Terminal closed/Hangup
    signal.signal(signal.SIGQUIT, signal_handler)  # Ctrl+\

    def signal_handler(signum, frame):
        logging.info("Shutdown signal received. Cleaning up...")
        shutdown_event.set()

    return shutdown_event


def get_last_item_from_queue(queue: Queue):
    item = queue.get()
    counter = 1

    # Drain queue and keep only the most recent parameters
    try:
        while True:
            item = queue.get_nowait()
            counter += 1
    except Empty:
        pass

    logging.debug(f"Drained {counter} items from queue")

    return item