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# Context: https://github.com/pyannote/pyannote-audio/issues/1370

import warnings

import torch


class ReproducibilityError(Exception):
    ...


class ReproducibilityWarning(UserWarning):
    ...


def raise_reproducibility(device: torch.device):
    if (device.type == "cuda") and (
        torch.backends.cuda.matmul.allow_tf32 or torch.backends.cudnn.allow_tf32
    ):
        raise ReproducibilityError(
            "Please disable TensorFloat-32 (TF32) by calling\n"
            "   >>> import torch\n"
            "   >>> torch.backends.cuda.matmul.allow_tf32 = False\n"
            "   >>> torch.backends.cudnn.allow_tf32 = False\n"
            "or you might face reproducibility issues and obtain lower accuracy.\n"
            "See https://github.com/pyannote/pyannote-audio/issues/1370 for more details."
        )


def warn_reproducibility(device: torch.device):
    if (device.type == "cuda") and (
        torch.backends.cuda.matmul.allow_tf32 or torch.backends.cudnn.allow_tf32
    ):
        warnings.warn(
            ReproducibilityWarning(
                "Please disable TensorFloat-32 (TF32) by calling\n"
                "   >>> import torch\n"
                "   >>> torch.backends.cuda.matmul.allow_tf32 = False\n"
                "   >>> torch.backends.cudnn.allow_tf32 = False\n"
                "or you might face reproducibility issues and obtain lower accuracy.\n"
                "See https://github.com/pyannote/pyannote-audio/issues/1370 for more details."
            )
        )


def fix_reproducibility(device: torch.device):
    if (device.type == "cuda") and (
        torch.backends.cuda.matmul.allow_tf32 or torch.backends.cudnn.allow_tf32
    ):
        torch.backends.cuda.matmul.allow_tf32 = False
        torch.backends.cudnn.allow_tf32 = False
        warnings.warn(
            ReproducibilityWarning(
                "TensorFloat-32 (TF32) has been disabled as it might lead to reproducibility issues and lower accuracy.\n"
                "It can be re-enabled by calling\n"
                "   >>> import torch\n"
                "   >>> torch.backends.cuda.matmul.allow_tf32 = True\n"
                "   >>> torch.backends.cudnn.allow_tf32 = True\n"
                "See https://github.com/pyannote/pyannote-audio/issues/1370 for more details.\n"
            )
        )