import os
from collections import OrderedDict
from pathlib import Path
import datasets
import os
from .meta import lang2shard_cnt
import json


class Yodas2Config(datasets.BuilderConfig):
    """BuilderConfig for Yodas2."""

    def __init__(self, lang, version, **kwargs):
        self.language = lang
        self.base_data_path = f"data/{lang}"

        description = (
            f"Youtube speech to text dataset in {self.language}."
        )
        super(Yodas2Config, self).__init__(
            name=lang,
            version=datasets.Version(version),
            description=description,
            **kwargs,
        )


DEFAULT_CONFIG_NAME = "all"
LANGS = list(lang2shard_cnt.keys())
VERSION = "1.0.0"

class Yodas2(datasets.GeneratorBasedBuilder):
    """YodasSample dataset."""

    BUILDER_CONFIGS = [
        Yodas2Config(lang, version=VERSION) for lang in LANGS
    ]

    VERSION = datasets.Version("1.0.1")

    def _info(self):
        return datasets.DatasetInfo(
            description="Yodas Sample",
            features=datasets.Features(
                OrderedDict(
                    [
                        ("id", datasets.Value("string")),
                        ("video_id", datasets.Value("string")),
                        ('duration', datasets.Value('float')),
                        ("audio", datasets.Audio(sampling_rate=24_000)),
                        ("utterances", datasets.Sequence(feature={'utt_id': datasets.Value(dtype='string'),
                                                                     'text': datasets.Value(dtype='string'),
                                                                     'start': datasets.Value(dtype='float'),
                                                                     'end': datasets.Value(dtype='float')}))
                    ]
                )
            ),
            supervised_keys=None,
            homepage="",  # TODO
            citation="",  # TODO
        )


    def _split_generators(self, dl_manager):
        """Returns SplitGenerators."""
        # TODO


        total_cnt = lang2shard_cnt[self.config.name]

        idx_lst = [f"{i:08d}" for i in range(total_cnt)]
        audio_tar_files = dl_manager.download([f"{self.config.base_data_path}/audio/{i:08d}.tar.gz" for i in range(total_cnt)])
        text_files = dl_manager.download([f"{self.config.base_data_path}/text/{i:08d}.json" for i in range(total_cnt)])
        duration_files = dl_manager.download([f"{self.config.base_data_path}/duration/{i:08d}.txt" for i in range(total_cnt)])

        if dl_manager.is_streaming:
            audio_archives = [dl_manager.iter_archive(audio_tar_file) for audio_tar_file in audio_tar_files]
            text_archives = [dl_manager.extract(text_file) for text_file in text_files]
            duration_archives = [dl_manager.extract(duration_file) for duration_file in duration_files]

        else:
            print("extracting audio ...")
            print("audio tarfiles... ")
            print(audio_tar_files)
            extracted_audio_archives = dl_manager.extract(audio_tar_files)
            print("extracted archives...")
            print(extracted_audio_archives)

            audio_archives = []
            text_archives = []
            duration_archives = []
            for idx, audio_tar_file, extracted_dir, text_file, duration_file in zip(idx_lst, audio_tar_files, extracted_audio_archives, text_files, duration_files):
                audio_archives.append(extracted_dir)
                text_archives.append(text_file)
                duration_archives.append(duration_file)


        return [
            datasets.SplitGenerator(
                name=datasets.Split.TRAIN,
                gen_kwargs={
                    "is_streaming": dl_manager.is_streaming,
                    "audio_archives": audio_archives,
                    'text_archives': text_archives,
                    'duration_archives': duration_archives,
                },
            ),
        ]

    def _generate_examples(self, is_streaming, audio_archives, text_archives, duration_archives):
        """Yields examples."""

        global_id = 0

        if is_streaming:
            for tar_file, text_file, duration_file in zip(audio_archives, text_archives, duration_archives):

                # video to text
                video2text = {}

                json_obj_lst = json.loads(open(text_file, 'r').read())
                for json_obj in json_obj_lst:
                    video_id = json_obj['audio_id']
                    video2text[video_id] = []

                    for k,v in sorted(json_obj['text'].items()):
                        fields = k.split('-')
                        start_timestamp = float(fields[-2]) / 100
                        end_timestamp = float(fields[-1]) / 100
                        video2text[video_id].append({'utt_id': k, 'text': v, 'start': start_timestamp, 'end': end_timestamp})


                # video to duration
                video2duration = {}
                with open(duration_file) as f:
                    for id_, row in enumerate(f):
                        fields = row.strip().split()
                        video_id = fields[0]
                        duration = float(fields[1])
                        video2duration[video_id] = duration


                for path, audio_f in tar_file:

                    path = Path(path)
                    video_id = path.stem

                    if video_id in video2text and video_id in video2duration:

                        result = {
                            'id': global_id,
                            'video_id': video_id,
                            'audio': {"path": None, "bytes": audio_f.read()},
                            'duration': video2duration[video_id],
                            'utterances': video2text[video_id]
                        }

                        yield global_id, result
                        global_id += 1
        else:
            for extracted_dir, text_file, duration_file in zip(audio_archives, text_archives, duration_archives):

                print('extracted_dir ', extracted_dir)

                print('actual extracted dir', extracted_dir)

                # video to text
                video2text = {}
                json_obj_lst = json.loads(open(text_file, 'r').read())
                for json_obj in json_obj_lst:
                    video_id = json_obj['audio_id']
                    video2text[video_id] = []

                    for k,v in sorted(json_obj['text'].items()):
                        fields = k.split('-')
                        start_timestamp = float(fields[-2]) / 100
                        end_timestamp = float(fields[-1]) / 100
                        video2text[video_id].append({'utt_id': k, 'text': v, 'start': start_timestamp, 'end': end_timestamp})


                # video to duration
                video2duration = {}
                with open(duration_file) as f:
                    for id_, row in enumerate(f):
                        fields = row.strip().split()
                        video_id = fields[0]
                        duration = float(fields[1])
                        video2duration[video_id] = duration


                for audio_file in list(Path(extracted_dir).glob('*')):

                    video_id = audio_file.stem

                    if video_id in video2text and video_id in video2duration:

                        result = {
                            'id': global_id,
                            'video_id': video_id,
                            'duration': video2duration[video_id],
                            'audio': {"path": str(audio_file.absolute()), "bytes": open(audio_file, 'rb').read()},
                            'utterances': video2text[video_id]
                        }

                        yield global_id, result
                        global_id += 1