# Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.

import logging
from enum import Enum
from typing import List

import numpy
import torch

logger = logging.getLogger(__name__)


class Split(Enum):
    train = 0
    valid = 1
    test = 2


def compile_helpers():
    """Compile C++ helper functions at runtime. Make sure this is invoked on a single process.
    """
    import os
    import subprocess

    command = ["make", "-C", os.path.abspath(os.path.dirname(__file__))]
    if subprocess.run(command).returncode != 0:
        import sys

        log_single_rank(logger, logging.ERROR, "Failed to compile the C++ dataset helper functions")
        sys.exit(1)


def log_single_rank(logger: logging.Logger, *args, rank=0, **kwargs):
    """If torch distributed is initialized, log only on rank

    Args:
        logger (logging.Logger): The logger to write the logs

        rank (int, optional): The rank to write on. Defaults to 0.
    """
    if torch.distributed.is_initialized():
        if torch.distributed.get_rank() == rank:
            logger.log(*args, **kwargs)
    else:
        logger.log(*args, **kwargs)


def normalize(weights: List[float]) -> List[float]:
    """Do non-exponentiated normalization

    Args:
        weights (List[float]): The weights

    Returns:
        List[float]: The normalized weights
    """
    w = numpy.array(weights, dtype=numpy.float64)
    w_sum = numpy.sum(w)
    w = (w / w_sum).tolist()
    return w