#!/usr/bin/python3
"""Watch https://osmcal.org/ for another Paris OSM hack weekend."""

import email.message
import email.utils
import smtplib
import sys

import requests

MAIL_FROM = "edward@4angle.com"
MAIL_TO = "edward@4angle.com"
SMTP_HOST = "4angle.com"

URL = "https://osmcal.org/api/v2/events/?in=France"


def send_mail(subject: str, body: str) -> None:
    """Send an e-mail."""
    msg = email.message.EmailMessage()

    msg["Subject"] = subject
    msg["To"] = f"Edward Betts <{MAIL_TO}>"
    msg["From"] = f"OSM Calendar alert <{MAIL_FROM}>"
    msg["Date"] = email.utils.formatdate()
    msg["Message-ID"] = email.utils.make_msgid()

    msg.set_content(body)

    s = smtplib.SMTP(SMTP_HOST)
    s.sendmail(MAIL_FROM, [MAIL_TO], msg.as_string())
    s.quit()


def check_for_paris_events() -> None:
    """Check for upcoming OSM events in Paris and send an email if found."""
    r = requests.get(URL)
    events = r.json()

    paris_events = [
        event for event in events if "paris" in event["location"]["detailed"].lower()
    ]

    if not paris_events:
        if sys.stdin.isatty():
            print(f"{len(events)} events found, none in Paris.")
        return

    subject = "Upcoming Paris OSM Hack Weekend Found!"
    count = len(paris_events)
    body = f"Found {count} {'event' if count == 1 else 'events'} in Paris:\n\n"
    for event in paris_events:
        body += (
            f"{event['name']} - {event['url']}\n"
            + f"Date: {event['date']['human']}\n"
            + f"Location: {event['location']['detailed']}\n\n"
        )
    send_mail(subject, body)


if __name__ == "__main__":
    check_for_paris_events()