# coding=utf-8
# Copyright (C) 2022. Huawei Technologies Co., Ltd. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from itertools import product


def combined_params(params_dict):
    """
    A generator combined parameters from `params_dict`

    Parameters
    ----------
    params_dict: dict
        A dict contains name and values of params, key denotes name, values
        denotes valid value.

    Returns
    -------
    out: dict
        A dict could as kwargs be passed to algorithm.
    """

    order_keys = []
    order_values = []
    for key, values in params_dict.items():
        order_keys.append(key)
        order_values.append(values)
    for value in product(*order_values):
        out_dict = {}
        for k, v in zip(order_keys, value):
            out_dict[k] = v

        yield out_dict
