"""Functions related to processing articles"""

import datetime as dt
import re
import warnings
from typing import Optional, Union

from newspaper import Article
from wrapt_timeout_decorator.wrapt_timeout_decorator import timeout


@timeout(10)
def download_article_with_timeout(article: Article):
    with warnings.catch_warnings():
        warnings.simplefilter("ignore", category=DeprecationWarning)
        article.download()
    return article


def process_article_url(url: str) -> Union[None, dict]:
    """Process the URL and extract the article.

    Args:
        url (str): The URL.

    Returns:
        dict or None:
            The processed article, or None if the URL could not be parsed.
    """
    # Remove GET arguments from the URL
    stripped_url = re.sub(r'(\?.*"|\/$)', "", url)

    try:
        article = Article(stripped_url)
        article = download_article_with_timeout(article)
        article.parse()
    except Exception:  # noqa
        return None

    # Extract the title and skip URL if it is empty
    title = article.title
    if title == "":
        return None
    else:
        title = re.sub("\n+", "\n", title)
        title = re.sub(" +", " ", title)
        title = title.strip()

    # Extract the content and skip URL if it is empty
    content = article.text.strip()
    if content == "":
        return None
    else:
        content = re.sub("\n+", "\n", content)
        content = re.sub(" +", " ", content)
        content = content.strip()

    # Extract the authors, the publishing date and the top image
    authors = list(article.authors)
    publish_date: Optional[str]
    if article.publish_date is not None:
        date = article.publish_date
        publish_date = dt.datetime.strftime(date, "%Y-%m-%d")
    else:
        publish_date = None
    try:
        top_image_url = article.top_image
    except AttributeError:
        top_image_url = None

    data_dict = dict(
        url=stripped_url,
        title=title,
        content=content,
        authors=authors,
        publish_date=publish_date,
        top_image_url=top_image_url,
    )
    return data_dict