#  Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserve.
#
#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.

import yaml
import logging
logger = logging.getLogger(__name__)

CONFIG_SECS = [
    'train',
    'valid',
    'test',
    'infer',
]


class AttrDict(dict):
    def __getattr__(self, key):
        return self[key]

    def __setattr__(self, key, value):
        if key in self.__dict__:
            self.__dict__[key] = value
        else:
            self[key] = value


def parse_config(cfg_file):
    """Load a config file into AttrDict"""
    import yaml
    with open(cfg_file, 'r') as fopen:
        yaml_config = AttrDict(yaml.load(fopen, Loader=yaml.Loader))
    create_attr_dict(yaml_config)
    return yaml_config


def create_attr_dict(yaml_config):
    from ast import literal_eval
    for key, value in yaml_config.items():
        if type(value) is dict:
            yaml_config[key] = value = AttrDict(value)
        if isinstance(value, str):
            try:
                value = literal_eval(value)
            except BaseException:
                pass
        if isinstance(value, AttrDict):
            create_attr_dict(yaml_config[key])
        else:
            yaml_config[key] = value
    return


def merge_configs(cfg, sec, args_dict):
    assert sec in CONFIG_SECS, "invalid config section {}".format(sec)
    sec_dict = getattr(cfg, sec.upper())
    for k, v in args_dict.items():
        if v is None:
            continue
        try:
            if hasattr(sec_dict, k):
                setattr(sec_dict, k, v)
        except:
            pass
    return cfg


def print_configs(cfg, mode):
    logger.info("---------------- {:>5} Arguments ----------------".format(
        mode))
    for sec, sec_items in cfg.items():
        logger.info("{}:".format(sec))
        for k, v in sec_items.items():
            logger.info("    {}:{}".format(k, v))
    logger.info("-------------------------------------------------")