# Copyright 2016 Cisco Systems, Inc.  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 attrdict import AttrDict
import yaml


def config_load(file_name, from_cfg=None):
    """Load a yaml file into a config dict, merge with from_cfg if not None
    The config file content taking precedence in case of duplicate
    """
    try:
        with open(file_name) as fileobj:
            cfg = AttrDict(yaml.safe_load(fileobj))
    except IOError:
        raise Exception("Configuration file at '{}' was not found. Please use correct path "
                        "and verify it is visible to container if you run nfvbench in container."
                        .format(file_name))

    if from_cfg:
        cfg = from_cfg + cfg

    return cfg


def config_loads(cfg_text, from_cfg=None):
    """Same as config_load but load from a string
    """
    try:
        cfg = AttrDict(yaml.load(cfg_text))
    except TypeError:
        # empty string
        cfg = AttrDict()
    if from_cfg:
        return from_cfg + cfg
    return cfg


def test_config():
    cfg = config_load('a1.yaml')
    cfg = config_load('a2.yaml', cfg)
    cfg = config_loads('color: 500', cfg)
    config_loads('')
    config_loads('#')