"""
helper utils for tests
"""

import importlib.util
import os
import shutil
import tempfile
import unittest
from functools import wraps
from pathlib import Path

import torch
from packaging import version
from tbparse import SummaryReader

from axolotl.utils.dict import DictDefault


def with_temp_dir(test_func):
    @wraps(test_func)
    def wrapper(*args, **kwargs):
        # Create a temporary directory
        temp_dir = tempfile.mkdtemp()
        try:
            # Pass the temporary directory to the test function
            test_func(*args, temp_dir=temp_dir, **kwargs)
        finally:
            # Clean up the directory after the test
            shutil.rmtree(temp_dir)

    return wrapper


def most_recent_subdir(path):
    base_path = Path(path)
    subdirectories = [d for d in base_path.iterdir() if d.is_dir()]
    if not subdirectories:
        return None
    subdir = max(subdirectories, key=os.path.getctime)

    return subdir


def require_torch_2_4_1(test_case):
    """
    Decorator marking a test that requires torch >= 2.5.1
    """

    def is_min_2_4_1():
        torch_version = version.parse(torch.__version__)
        return torch_version >= version.parse("2.4.1")

    return unittest.skipUnless(is_min_2_4_1(), "test requires torch>=2.4.1")(test_case)


def require_torch_2_5_1(test_case):
    """
    Decorator marking a test that requires torch >= 2.5.1
    """

    def is_min_2_5_1():
        torch_version = version.parse(torch.__version__)
        return torch_version >= version.parse("2.5.1")

    return unittest.skipUnless(is_min_2_5_1(), "test requires torch>=2.5.1")(test_case)


def require_torch_2_6_0(test_case):
    """
    Decorator marking a test that requires torch >= 2.6.0
    """

    def is_min_2_6_0():
        torch_version = version.parse(torch.__version__)
        return torch_version >= version.parse("2.6.0")

    return unittest.skipUnless(is_min_2_6_0(), "test requires torch>=2.6.0")(test_case)


def require_torch_2_7_0(test_case):
    """
    Decorator marking a test that requires torch >= 2.7.0
    """

    def is_min_2_7_0():
        torch_version = version.parse(torch.__version__)
        return torch_version >= version.parse("2.7.0")

    return unittest.skipUnless(is_min_2_7_0(), "test requires torch>=2.7.0")(test_case)


def require_torch_2_8_0(test_case):
    """
    Decorator marking a test that requires torch >= 2.7.0
    """

    def is_min_2_8_0():
        torch_version = version.parse(torch.__version__)
        return torch_version >= version.parse("2.8.0")

    return unittest.skipUnless(is_min_2_8_0(), "test requires torch>=2.8.0")(test_case)


def require_torch_lt_2_6_0(test_case):
    """
    Decorator marking a test that requires torch < 2.6.0
    """

    def is_max_2_6_0():
        torch_version = version.parse(torch.__version__)
        return torch_version < version.parse("2.6.0")

    return unittest.skipUnless(is_max_2_6_0(), "test requires torch<2.6.0")(test_case)


def require_vllm(test_case):
    """
    Decorator marking a test that requires a vllm to be installed
    """

    def is_vllm_installed():
        return importlib.util.find_spec("vllm") is not None

    return unittest.skipUnless(
        is_vllm_installed(), "test requires vllm to be installed"
    )(test_case)


def require_llmcompressor(test_case):
    """
    Decorator marking a test that requires a llmcompressor to be installed
    """

    def is_llmcompressor_installed():
        return importlib.util.find_spec("llmcompressor") is not None

    return unittest.skipUnless(
        is_llmcompressor_installed(), "test requires llmcompressor to be installed"
    )(test_case)


def requires_sm_ge_100(test_case):
    is_sm_ge_100 = (
        torch.cuda.is_available()
        and torch.version.cuda
        and torch.cuda.get_device_capability() >= (10, 0)
    )
    return unittest.skipUnless(is_sm_ge_100, "test requires sm>=100")(test_case)


def requires_cuda_ge_8_9(test_case):
    is_cuda_ge_8_9 = (
        torch.cuda.is_available()
        and torch.version.cuda
        and torch.cuda.get_device_capability() >= (8, 9)
    )
    return unittest.skipUnless(is_cuda_ge_8_9, "test requires cuda>=8.9")(test_case)


def is_hopper():
    compute_capability = torch.cuda.get_device_capability()
    return compute_capability == (9, 0)


def require_hopper(test_case):
    return unittest.skipUnless(is_hopper(), "test requires h100/hopper GPU")(test_case)


def supports_fp8(test_case):
    compute_capability = torch.cuda.get_device_capability()
    return unittest.skipUnless(
        compute_capability >= (9, 0), "test requires h100 or newer GPU"
    )(test_case)


def check_tensorboard(
    temp_run_dir: str,
    tag: str,
    lt_val: float,
    assertion_err: str,
    rtol: float = 0.02,
    gt_zero: bool = True,
) -> None:
    """
    helper function to parse and check tensorboard logs
    """
    tb_log_path = most_recent_subdir(temp_run_dir)
    event_file = os.path.join(tb_log_path, sorted(os.listdir(tb_log_path))[0])
    reader = SummaryReader(event_file)
    df = reader.scalars
    df = df[(df.tag == tag)]
    lt_val = (1 + rtol) * lt_val
    if "%s" in assertion_err:
        assert df.value.values[-1] < lt_val, assertion_err % df.value.values[-1]
    else:
        assert df.value.values[-1] < lt_val, assertion_err
    if gt_zero:
        assert df.value.values[-1] > 1e-5, "Expected loss to be greater than zero"


def check_model_output_exists(temp_dir: str, cfg: DictDefault) -> None:
    """
    helper function to check if a model output file exists after training

    checks based on adapter or not (always safetensors in Transformers V5)
    """

    if not cfg.adapter:
        assert (Path(temp_dir) / "model.safetensors").exists()
    else:
        assert (Path(temp_dir) / "adapter_model.safetensors").exists()
