import json 
import re
import requests
from .. import config
from .. import util
from ..exceptions import InvalidVideoIdException 
headers = config.headers
pattern=re.compile(r"yt\.setConfig\({'PLAYER_CONFIG': ({.*})}\);")

def _parse(html):
    result = re.search(pattern, html)
    res= json.loads(result.group(1))
    response = res["args"].get("embedded_player_response")
    if response is None:
        raise InvalidVideoIdException("Invalid video_id.")
    renderer = (json.loads(response))["embedPreview"]["thumbnailPreviewRenderer"]
    return {
        "duration": int(renderer["videoDurationSeconds"]),
        "title" : [''.join(run["text"]) for run in renderer["title"]["runs"]][0],
        "channelId" : renderer["videoDetails"]["embeddedPlayerOverlayVideoDetailsRenderer"]["channelThumbnailEndpoint"]["channelThumbnailEndpoint"]["urlEndpoint"]["urlEndpoint"]["url"][9:]
    }

def get_info(video_id):
    url = f"https://www.youtube.com/embed/{video_id}"
    resp= requests.get(url, headers = headers)
    resp.raise_for_status()
    return  _parse(resp.text)