# 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 collections
import os
from typing import List, Tuple

from paddle.dataset.common import DATA_HOME
from paddle.utils import download

from .dataset import AudioClassificationDataset

__all__ = []


class ESC50(AudioClassificationDataset):
    """
    The ESC-50 dataset is a labeled collection of 2000 environmental audio recordings
    suitable for benchmarking methods of environmental sound classification. The dataset
    consists of 5-second-long recordings organized into 50 semantical classes (with
    40 examples per class)

    Reference:
        ESC: Dataset for Environmental Sound Classification
        http://dx.doi.org/10.1145/2733373.2806390

    Args:
       mode (str, optional): It identifies the dataset mode (train or dev). Default:train.
       split (int, optional): It specify the fold of dev dataset. Default:1.
       feat_type (str, optional): It identifies the feature type that user wants to extract of an audio file. Default:raw.
       archive(dict, optional): it tells where to download the audio archive. Default:None.

    Returns:
        :ref:`api_paddle_io_Dataset`. An instance of ESC50 dataset.

    Examples:

        .. code-block:: python

            import paddle

            mode = 'dev'
            esc50_dataset = paddle.audio.datasets.ESC50(mode=mode,
                                                    feat_type='raw')
            for idx in range(5):
                audio, label = esc50_dataset[idx]
                # do something with audio, label
                print(audio.shape, label)
                # [audio_data_length] , label_id

            esc50_dataset = paddle.audio.datasets.ESC50(mode=mode,
                                                    feat_type='mfcc',
                                                    n_mfcc=40)
            for idx in range(5):
                audio, label = esc50_dataset[idx]
                # do something with mfcc feature, label
                print(audio.shape, label)
                # [feature_dim, length] , label_id
    """

    archive = {
        'url': 'https://paddleaudio.bj.bcebos.com/datasets/ESC-50-master.zip',
        'md5': '7771e4b9d86d0945acce719c7a59305a',
    }

    label_list = [
        # Animals
        'Dog',
        'Rooster',
        'Pig',
        'Cow',
        'Frog',
        'Cat',
        'Hen',
        'Insects (flying)',
        'Sheep',
        'Crow',
        # Natural soundscapes & water sounds
        'Rain',
        'Sea waves',
        'Crackling fire',
        'Crickets',
        'Chirping birds',
        'Water drops',
        'Wind',
        'Pouring water',
        'Toilet flush',
        'Thunderstorm',
        # Human, non-speech sounds
        'Crying baby',
        'Sneezing',
        'Clapping',
        'Breathing',
        'Coughing',
        'Footsteps',
        'Laughing',
        'Brushing teeth',
        'Snoring',
        'Drinking, sipping',
        # Interior/domestic sounds
        'Door knock',
        'Mouse click',
        'Keyboard typing',
        'Door, wood creaks',
        'Can opening',
        'Washing machine',
        'Vacuum cleaner',
        'Clock alarm',
        'Clock tick',
        'Glass breaking',
        # Exterior/urban noises
        'Helicopter',
        'Chainsaw',
        'Siren',
        'Car horn',
        'Engine',
        'Train',
        'Church bells',
        'Airplane',
        'Fireworks',
        'Hand saw',
    ]
    meta = os.path.join('ESC-50-master', 'meta', 'esc50.csv')
    meta_info = collections.namedtuple(
        'META_INFO',
        ('filename', 'fold', 'target', 'category', 'esc10', 'src_file', 'take'),
    )
    audio_path = os.path.join('ESC-50-master', 'audio')

    def __init__(
        self,
        mode: str = 'train',
        split: int = 1,
        feat_type: str = 'raw',
        archive=None,
        **kwargs,
    ):
        assert split in range(
            1, 6
        ), f'The selected split should be integer, and 1 <= split <= 5, but got {split}'
        if archive is not None:
            self.archive = archive
        files, labels = self._get_data(mode, split)
        super().__init__(
            files=files, labels=labels, feat_type=feat_type, **kwargs
        )

    def _get_meta_info(self) -> List[collections.namedtuple]:
        ret = []
        with open(os.path.join(DATA_HOME, self.meta), 'r') as rf:
            for line in rf.readlines()[1:]:
                ret.append(self.meta_info(*line.strip().split(',')))
        return ret

    def _get_data(self, mode: str, split: int) -> Tuple[List[str], List[int]]:
        if not os.path.isdir(
            os.path.join(DATA_HOME, self.audio_path)
        ) or not os.path.isfile(os.path.join(DATA_HOME, self.meta)):
            download.get_path_from_url(
                self.archive['url'],
                DATA_HOME,
                self.archive['md5'],
                decompress=True,
            )

        meta_info = self._get_meta_info()

        files = []
        labels = []
        for sample in meta_info:
            filename, fold, target, _, _, _, _ = sample
            if mode == 'train' and int(fold) != split:
                files.append(os.path.join(DATA_HOME, self.audio_path, filename))
                labels.append(int(target))

            if mode != 'train' and int(fold) == split:
                files.append(os.path.join(DATA_HOME, self.audio_path, filename))
                labels.append(int(target))

        return files, labels
