from __future__ import unicode_literals

import os
import uuid
from datetime import datetime
from urllib.parse import urlparse

import youtube_dl

from src.exceptions.download_exceptions import SiteNotImplementedException


class VideoDownloader:
    SUPPORTING_WEBSITES = [
        "ok.ru", "vk.com", "www.youtube.com",
    ]
    BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
    BASE_DOWNLOAD_DIR = os.path.join(BASE_DIR, "downloads")
    BASE_YOUTUBE_DIR = os.path.join(BASE_DOWNLOAD_DIR, "Youtube")

    def __init__(self, link: str, ydl_opts: dict = None, username: str = None, password: str = None):
        self.link = link
        self.ydl_opts = ydl_opts
        self.username = username
        self.password = password

    @staticmethod
    def get_unique_video_filename():
        prefix = f'vid_{datetime.now().strftime("%Y%m%d%H%M%S")}'
        random_uuid4 = uuid.uuid4().hex[:8]
        filename = f"{prefix}_{random_uuid4}"
        return filename

    def download(self):
        domain = urlparse(self.link).netloc
        if domain not in self.SUPPORTING_WEBSITES:
            raise SiteNotImplementedException

        with youtube_dl.YoutubeDL(self.ydl_opts if self.ydl_opts else {}) as ydl:
            ydl.download([self.link])
            result = ydl.extract_info(self.link, download=False)
            return result