import contextlib
import functools
import gc

import pytest
import ray
import torch

from vllm.distributed import (destroy_distributed_environment,
                              destroy_model_parallel)
from vllm.model_executor.model_loader.tensorizer import TensorizerConfig


@pytest.fixture(autouse=True)
def cleanup():
    destroy_model_parallel()
    destroy_distributed_environment()
    with contextlib.suppress(AssertionError):
        torch.distributed.destroy_process_group()
    ray.shutdown()
    gc.collect()
    torch.cuda.empty_cache()


def retry_until_skip(n):

    def decorator_retry(func):

        @functools.wraps(func)
        def wrapper_retry(*args, **kwargs):
            for i in range(n):
                try:
                    return func(*args, **kwargs)
                except AssertionError:
                    gc.collect()
                    torch.cuda.empty_cache()
                    if i == n - 1:
                        pytest.skip("Skipping test after attempts..")

        return wrapper_retry

    return decorator_retry


@pytest.fixture(autouse=True)
def tensorizer_config():
    config = TensorizerConfig(tensorizer_uri="vllm")
    return config