import re, os.path
import requests
from urllib.parse import urlparse


def save_file(file, content):
    with open(file, 'w') as f:
        f.write(content)


def read_file(filename):
    with open(filename) as f:
        return f.read()


def name_from_url(url):
    return os.path.basename(url[:-1])


def image_url_to_filename(url):
    parsed_url = urlparse(url)
    filename = os.path.basename(parsed_url.path)
    name, ext = os.path.splitext(filename)
    date_match = re.search(r'(\d{4})/(\d{2})', parsed_url.path)
    if not date_match:
        raise ValueError("no valid date found in URL")
    year = date_match.group(1)
    month = date_match.group(2)
    return f"{year}{month}_{name}{ext}"


def extract_images_from_markdown(markdown_text):
    image_pattern = r"!\[.*?\]\((.*?)\)"
    images = re.findall(image_pattern, markdown_text)
    return images


def download_file(url, filename):
    response = requests.get(url, stream=True)
    response.raise_for_status()
    if response.status_code == 200:
        with open(filename, 'wb') as file:
            for chunk in response.iter_content(1024):
                file.write(chunk)