import re
from ... import config
from ... exceptions import (
    ResponseContextError,
    NoContents, NoContinuation)

logger = config.logger(__name__)


def parse(jsn):
    """
    Parse replay chat data.
    Parameter:
    ----------
    jsn : dict
        JSON of replay chat data.
    Returns:
    ------
        continuation : str
        actions : list

    """
    if jsn is None:
        raise ValueError("parameter JSON is None")
    if jsn['response']['responseContext'].get('errors'):
        raise ResponseContextError(
            'video_id is invalid or private/deleted.')
    contents = jsn["response"].get('continuationContents')
    if contents is None:
        raise NoContents('No chat data.')

    cont = contents['liveChatContinuation']['continuations'][0]
    if cont is None:
        raise NoContinuation('No Continuation')
    metadata = cont.get('liveChatReplayContinuationData')
    if metadata:
        continuation = metadata.get("continuation")
        actions = contents['liveChatContinuation'].get('actions')
        if continuation:
            return continuation, [action["replayChatItemAction"]["actions"][0]
                                  for action in actions
                                  if list(action['replayChatItemAction']["actions"][0].values()
                                          )[0]['item'].get("liveChatPaidMessageRenderer")
                                  or list(action['replayChatItemAction']["actions"][0].values()
                                          )[0]['item'].get("liveChatPaidStickerRenderer")
                                  ]
    return None, []


def get_offset(item):
    return int(item['replayChatItemAction']["videoOffsetTimeMsec"])


def get_id(item):
    return list((list(item['replayChatItemAction']["actions"][0].values()
                      )[0])['item'].values())[0].get('id')


def get_type(item):
    return list((list(item['replayChatItemAction']["actions"][0].values()
                      )[0])['item'].keys())[0]


_REGEX_YTINIT = re.compile(
    "window\\[\"ytInitialData\"\\]\\s*=\\s*({.+?});\\s+")


def extract(text):

    match = re.findall(_REGEX_YTINIT, str(text))
    if match:
        return match[0]
    return None