# Copyright (c) 2018-2023, NVIDIA Corporation
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#    this list of conditions and the following disclaimer in the documentation
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# python
#import pwd
import getpass
import tempfile
import time
from collections import OrderedDict
from os.path import join

import numpy as np
import torch
import random
import os


def retry(times, exceptions):
    """
    Retry Decorator https://stackoverflow.com/a/64030200/1645784
    Retries the wrapped function/method `times` times if the exceptions listed
    in ``exceptions`` are thrown
    :param times: The number of times to repeat the wrapped function/method
    :type times: Int
    :param exceptions: Lists of exceptions that trigger a retry attempt
    :type exceptions: Tuple of Exceptions
    """
    def decorator(func):
        def newfn(*args, **kwargs):
            attempt = 0
            while attempt < times:
                try:
                    return func(*args, **kwargs)
                except exceptions:
                    print(f'Exception thrown when attempting to run {func}, attempt {attempt} out of {times}')
                    time.sleep(min(2 ** attempt, 30))
                    attempt += 1

            return func(*args, **kwargs)
        return newfn
    return decorator


def flatten_dict(d, prefix='', separator='.'):
    res = dict()
    for key, value in d.items():
        if isinstance(value, (dict, OrderedDict)):
            res.update(flatten_dict(value, prefix + key + separator, separator))
        else:
            res[prefix + key] = value

    return res


def set_np_formatting():
    """ formats numpy print """
    np.set_printoptions(edgeitems=30, infstr='inf',
                        linewidth=4000, nanstr='nan', precision=2,
                        suppress=False, threshold=10000, formatter=None)


def set_seed(seed, torch_deterministic=False, rank=0):
    """ set seed across modules """
    if seed == -1 and torch_deterministic:
        seed = 42 + rank
    elif seed == -1:
        seed = np.random.randint(0, 10000)
    else:
        seed = seed + rank

    print("Setting seed: {}".format(seed))

    random.seed(seed)
    np.random.seed(seed)
    torch.manual_seed(seed)
    os.environ['PYTHONHASHSEED'] = str(seed)
    torch.cuda.manual_seed(seed)
    torch.cuda.manual_seed_all(seed)

    if torch_deterministic:
        # refer to https://docs.nvidia.com/cuda/cublas/index.html#cublasApi_reproducibility
        os.environ['CUBLAS_WORKSPACE_CONFIG'] = ':4096:8'
        torch.backends.cudnn.benchmark = False
        torch.backends.cudnn.deterministic = True
        torch.use_deterministic_algorithms(True)
    else:
        torch.backends.cudnn.benchmark = True
        torch.backends.cudnn.deterministic = False

    return seed

def nested_dict_set_attr(d, key, val):
    pre, _, post = key.partition('.')
    if post:
        nested_dict_set_attr(d[pre], post, val)
    else:
        d[key] = val
    
def nested_dict_get_attr(d, key):
    pre, _, post = key.partition('.')
    if post:
        return nested_dict_get_attr(d[pre], post)
    else:
        return d[key]

def ensure_dir_exists(path):
    if not os.path.exists(path):
        os.makedirs(path)
    return path


def safe_ensure_dir_exists(path):
    """Should be safer in multi-treaded environment."""
    try:
        return ensure_dir_exists(path)
    except FileExistsError:
        return path


def get_username():
    uid = os.getuid()
    try:
        return getpass.getuser()
    except KeyError:
        # worst case scenario - let's just use uid
        return str(uid)


def project_tmp_dir():
    tmp_dir_name = f'ige_{get_username()}'
    return safe_ensure_dir_exists(join(tempfile.gettempdir(), tmp_dir_name))

# EOF
