"""Common utils for testing purposes"""

from random import shuffle

import oddt

from oddt.utils import is_openbabel_molecule

def shuffle_mol(mol):

    """Randomly reorder molecule atoms and return a shuffled copy of input."""

    new_mol = mol.clone

    new_order = list(range(len(mol.atoms)))

    shuffle(new_order)

    if is_openbabel_molecule(mol):

        new_mol.OBMol.RenumberAtoms([i + 1 for i in new_order])

    else:

        new_mol.Mol = oddt.toolkits.rdk.Chem.RenumberAtoms(new_mol.Mol, new_order)

    return new_mol