import math, re

from bs4 import BeautifulSoup

def get_urls(string:str = None) -> list:
    """
    Extracts URLs from a given string using regular expressions.

    Parameters:
    string (str): The input string from which URLs need to be extracted.

    Returns:
    list: A list of URLs extracted from the input string.
    """
    regex = re.compile(
        r'((([A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=\+\$,\w]+@)?[A-Za-z0-9.-]+|(?:www.|[-;:&=\+\$,\w]+@)[A-Za-z0-9.-]+)((?:\/[\+~%\/.\w_]*)?\??(?:[-\+=&;%@.\w_]*)#?(?:[.\!\/\\w]*))?)',
        re.IGNORECASE)

    return [x[0] for x in re.findall(regex, string)]


def convert_size(size_bytes: int) -> str:
        """
        A function that converts the given size in bytes to a human-readable format.
        
        Parameters:
            size_bytes (int): An integer representing the size in bytes to be converted.
        
        Returns:
            A string representing the converted size with the appropriate unit (B, KiB, MiB, GiB, etc.).
        """
        if size_bytes == 0:
            return "0B"
        size_name = ("B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB")
        i = int(math.floor(math.log(size_bytes, 1024)))
        p = math.pow(1024, i)
        s = round(size_bytes / p, 2)
        return f"{s} {size_name[i]}"


def is_string_html(string: str) -> bool:
    '''
    Check if string is HTML
    
    Parameters:
        string (str): The string to be checked
    
    Returns:
        bool: True if string is HTML, False otherwise
    '''
    return bool(BeautifulSoup(string, "html.parser").find())


def html_to_text(string):
    """
    Converts an HTML string to plain text by removing all HTML tags and returning the resulting text.
    
    Parameters:
        string (str): The HTML string to be converted.
        
    Returns:
        str: The plain text version of the input HTML string.
    """
    if is_string_html(string):
        soup = BeautifulSoup(string, "html.parser")
        return soup.get_text()
    else:
        return string