import time
import urllib

from pytube import YouTube

from core import constants, logging_
from core.exceptions import YoutubeStreamNotFound

MAX_ATTEMPTS = 5

logger = logging_.get("mew")


class YoutubeDownloader:
    output_dir = constants.APP_ROOT / 'data' / 'youtube'

    @staticmethod
    def get_audio_stream(yt):
        args = [
            {"only_audio": True},
            {"file_extension": 'mp4'}
        ]

        for a in args:
            stream = yt.streams \
                .filter(**a) \
                .first()
            if stream:
                return stream

    @staticmethod
    def get_stream(url):
        for i in range(1, MAX_ATTEMPTS + 1):
            logger.info(f"download {url} - attempt {i}/{MAX_ATTEMPTS}")
            try:
                yt = YouTube(url)
                return YoutubeDownloader.get_audio_stream(yt)
            except urllib.error.HTTPError:
                time.sleep(500)
                continue

    @staticmethod
    def download(url):
        logger.info(f"** Download {url} into {YoutubeDownloader.output_dir}")

        stream = YoutubeDownloader.get_stream(url)

        if stream is None:
            raise YoutubeStreamNotFound('Stream not found')

        logger.info(f"stream found - start downloading")

        stream.download(
            output_path=YoutubeDownloader.output_dir,
            timeout=3,
            max_retries=5
        )
        fname = stream.title
        logger.info(f"> file downloaded as {YoutubeDownloader.output_dir}/{fname}")
        return fname


if __name__ == "__main__":
    YoutubeDownloader.download(
        'https://www.youtube.com/watch?v=nOWjX4BpC24XXXXXX'
    )