import re

from bs4 import BeautifulSoup
from common import dates, http
from common.releasedata import ProductData, config_from_argv

"""Fetch Looker versions from the Google Cloud release notes RSS feed.
"""

ANNOUNCEMENT_PATTERN = re.compile(r"includes\s+the\s+following\s+changes", re.IGNORECASE)

config = config_from_argv()
with ProductData(config.product) as product_data:
    rss = http.fetch_xml(config.url)

    for item in rss.getElementsByTagName("entry"):
        content = item.getElementsByTagName("content")[0].firstChild.nodeValue
        content_soup = BeautifulSoup(content, features="html5lib")

        announcement_match = content_soup.find(string=ANNOUNCEMENT_PATTERN)
        if not announcement_match:
            continue

        version_match = config.first_match(announcement_match.parent.get_text())
        if not version_match:
            continue
        version = config.render(version_match)

        date_str = item.getElementsByTagName("updated")[0].firstChild.nodeValue
        date = dates.parse_datetime(date_str)

        product_data.declare_version(version, date)