# Copyright (c) 2021 PaddlePaddle Authors. 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.
import functools
import logging
import os
from typing import Any
from typing import Dict

from paddle.framework import load
from paddle.utils import download

from .entry import commands

__all__ = [
    'cli_register',
    'get_command',
    'download_and_decompress',
    'load_state_dict_from_url',
    'logger',
]


def cli_register(name: str, description: str='') -> Any:
    def _warpper(command):
        items = name.split('.')

        com = commands
        for item in items:
            com = com[item]
        com['_entry'] = command
        if description:
            com['_description'] = description
        return command

    return _warpper


def get_command(name: str) -> Any:
    items = name.split('.')
    com = commands
    for item in items:
        com = com[item]

    return com['_entry']


def decompress(file: str) -> os.PathLike:
    """
    Extracts all files from a compressed file.
    """
    assert os.path.isfile(file), "File: {} not exists.".format(file)
    return download._decompress(file)


def download_and_decompress(archive: Dict[str, str], path: str) -> os.PathLike:
    """
    Download archieves and decompress to specific path.
    """
    if not os.path.isdir(path):
        os.makedirs(path)

    assert 'url' in archive and 'md5' in archive, \
        'Dictionary keys of "url" and "md5" are required in the archive, but got: {}'.format(list(archive.keys()))
    return download.get_path_from_url(archive['url'], path, archive['md5'])


def load_state_dict_from_url(url: str, path: str, md5: str=None) -> os.PathLike:
    """
    Download and load a state dict from url
    """
    if not os.path.isdir(path):
        os.makedirs(path)

    download.get_path_from_url(url, path, md5)
    return load(os.path.join(path, os.path.basename(url)))


def _get_user_home():
    return os.path.expanduser('~')


def _get_paddlespcceh_home():
    if 'PPSPEECH_HOME' in os.environ:
        home_path = os.environ['PPSPEECH_HOME']
        if os.path.exists(home_path):
            if os.path.isdir(home_path):
                return home_path
            else:
                raise RuntimeError(
                    'The environment variable PPSPEECH_HOME {} is not a directory.'.
                    format(home_path))
        else:
            return home_path
    return os.path.join(_get_user_home(), '.paddlespeech')


def _get_sub_home(directory):
    home = os.path.join(_get_paddlespcceh_home(), directory)
    if not os.path.exists(home):
        os.makedirs(home)
    return home


PPSPEECH_HOME = _get_paddlespcceh_home()
MODEL_HOME = _get_sub_home('models')


class Logger(object):
    def __init__(self, name: str=None):
        name = 'PaddleSpeech' if not name else name
        self.logger = logging.getLogger(name)

        log_config = {
            'DEBUG': 10,
            'INFO': 20,
            'TRAIN': 21,
            'EVAL': 22,
            'WARNING': 30,
            'ERROR': 40,
            'CRITICAL': 50
        }
        for key, level in log_config.items():
            logging.addLevelName(level, key)
            self.__dict__[key.lower()] = functools.partial(self.__call__, level)

        self.format = logging.Formatter(
            fmt='[%(asctime)-15s] [%(levelname)8s] [%(filename)s] [L%(lineno)d] - %(message)s'
        )

        self.handler = logging.StreamHandler()
        self.handler.setFormatter(self.format)

        self.logger.addHandler(self.handler)
        self.logger.setLevel(logging.DEBUG)
        self.logger.propagate = False

    def __call__(self, log_level: str, msg: str):
        self.logger.log(log_level, msg)


logger = Logger()