import shutil

from copy    import deepcopy
from pathlib import Path


def deep_update(original, updates):
    """
    Recursively update `original` with values from `updates`.

    - Dicts are merged recursively.
    - Scalars replace existing values.
    - Lists are replaced entirely.
    """
    if not isinstance(original, dict) or not isinstance(updates, dict):
        return deepcopy(updates)

    result = deepcopy(original)

    for key, value in updates.items():
        if (
            key in result
            and isinstance(result[key], dict)
            and isinstance(value, dict)
        ):
            result[key] = deep_update(result[key], value)
        else:
            result[key] = deepcopy(value)

    return result



def copytree_no_copystat(src, dst):
    src = Path(src)
    dst = Path(dst)

    dst.mkdir(parents=True, exist_ok=True)

    for item in src.iterdir():
        target = dst / item.name

        if item.is_dir():
            copytree_no_copystat(item, target)
        else:
            shutil.copy2(item, target)