# -*- coding: utf-8 -*-

# BSD 3-Clause License

#

# Copyright (c) 2017

# All rights reserved.

# Copyright 2022 Huawei Technologies Co., Ltd

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions are met:

#

# * Redistributions of source code must retain the above copyright notice, this

#   list of conditions and the following disclaimer.

#

# * Redistributions in binary form must reproduce the above copyright notice,

#   this list of conditions and the following disclaimer in the documentation

#   and/or other materials provided with the distribution.

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# * Neither the name of the copyright holder nor the names of its

#   contributors may be used to endorse or promote products derived from

#   this software without specific prior written permission.

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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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# ==========================================================================





# Copyright (c) 2015-present, Facebook, Inc.

# All rights reserved.

import os

import sys

import logging





# @functools.lru_cache()

def create_logger(output_dir, dist_rank=0, name=''):

    # create logger

    logger = logging.getLogger(name)

    logger.setLevel(logging.DEBUG)

    logger.propagate = False



    # create formatter

    fmt = '[%(asctime)s %(name)s] (%(filename)s %(lineno)d): %(levelname)s %(message)s'



    # create console handlers for master process

    if dist_rank == 0:

        console_handler = logging.StreamHandler(sys.stdout)

        console_handler.setLevel(logging.DEBUG)

        console_handler.setFormatter(

            logging.Formatter(fmt=fmt, datefmt='%Y-%m-%d %H:%M:%S'))

        logger.addHandler(console_handler)



    # create file handlers

    if len(output_dir) > 0:

        file_handler = logging.FileHandler(os.path.join(output_dir, f'log_rank{dist_rank}.txt'), mode='a')

        file_handler.setLevel(logging.DEBUG)

        file_handler.setFormatter(logging.Formatter(fmt=fmt, datefmt='%Y-%m-%d %H:%M:%S'))

        logger.addHandler(file_handler)

        file_handler.flush()



    return logger