#!/usr/bin/python3

"""Check if conference websites are live."""

import re
import smtplib
from email.mime.text import MIMEText
from email.utils import formatdate, make_msgid

import requests

re_title = re.compile("<title>(.*?)</title>")

AGENT = "Mozilla/5.0 (Windows NT 6.1) Gecko/20100101 Firefox/29.0"
headers = {"User-Agent": AGENT, "Accept": "text/html"}

s = requests.Session()
s.headers.update(headers)

MAIL_FROM = "edward@4angle.com"
MAIL_TO_NAME = "Edward Betts"
MAIL_TO_ADDRESS = "edward@4angle.com"
SMTP_HOST = "4angle.com"

not_here_list = [
    "The specified URL was not found.",
    "There is currently no text in this page.",
    "This page does not exist yet",
    "404 Not Found",
]

conferences = [
    #    ("FOSDEM", "https://fosdem.org/2024"),
    ("PyCascades", "https://2024.pycascades.com/"),
    ("foss-north", "https://foss-north.se/2024"),
    ("Wikimedia Hackathon", "https://www.mediawiki.org/wiki/Wikimedia_Hackathon_2024"),
    ("FOSS4G", "https://2024.foss4g.org/"),
    ("FOSS4G Europe", "https://2024.europe.foss4g.org/"),
    ("FOSSY", "https://2024.fossy.us/"),
    #    ("North Bay Python", "https://2024.northbaypython.org/"),
    ("DebConf", "https://wiki.debian.org/DebConf/24"),
    ("State of the Map US", "https://2024.stateofthemap.us/"),
    ("WikiConference North America", "https://wikiconference.org/wiki/2024/Main_Page"),
    ("PyCon DE", "https://2024.pycon.de/"),
    ("PyData London", "https://pydata.org/london2024"),
    ("Pass the SALT", "https://2024.pass-the-salt.org/"),
]


def find_not_here_message(html: str) -> str | None:
    """Find not here message in web page."""
    return next((not_here for not_here in not_here_list if not_here in html), None)


def get_title(html: str) -> str:
    """Title from web page."""
    m = re_title.search(html)
    return m.group(1) if m and m.group(1) else "no title"


def check_conference(name: str, url: str) -> tuple[bool, str]:
    """Check if conference is live."""
    try:
        r = s.get(url)
    except requests.exceptions.ConnectionError:
        return (False, "connection refused")

    not_here = find_not_here_message(r.text)
    return (False, not_here) if not_here else (True, get_title(r.text))


def send_mail(subject: str, body: str) -> None:
    """Send an e-mail."""
    mail_from = MAIL_FROM
    msg = MIMEText(body, "plain", "UTF-8")

    msg["Subject"] = subject
    msg["To"] = f"{MAIL_TO_NAME} <{MAIL_TO_ADDRESS}>"
    msg["From"] = f"Edward Betts <{mail_from}>"
    msg["Date"] = formatdate()
    msg["Message-ID"] = make_msgid()
    # msg["X-4angle"] = "conference"

    s = smtplib.SMTP(SMTP_HOST)
    s.sendmail(mail_from, [MAIL_TO_ADDRESS], msg.as_string())
    s.quit()


def main(show_not_live: bool = False) -> None:
    """Check each conference."""
    for name, url in conferences:
        live, msg = check_conference(name, url)
        if live or show_not_live:
            print(f"{name}: {msg}")
        if not live:
            continue
        body = f"{name}\n{url}\nWeb page title: {msg}"
        send_mail(f"Conference site live: {name}", body)


if __name__ == "__main__":
    main()