#!/usr/bin/python3

import sys
import os
from icalendar import Calendar, Event


def parse_ics_file(fp):
    cal = Calendar.from_ical(fp.read())

    for event in cal.walk("VEVENT"):
        event.subcomponents = list(
            filter(lambda sc: sc.name != "VALARM", event.subcomponents)
        )

        if url := event.get("X-MICROSOFT-SKYPETEAMSMEETINGURL"):
            event["location"] = url
            desc = '\n'.join([
                s.strip()
                for s in event["description"].strip().split("_" * 8)
                if s and not 'teams.microsoft.com' in s
            ])
            event["description"] = desc

        for k in [k for k in event.keys() if k.startswith("X-MICROSOFT")]:
            del event[k]

    return cal.to_ical()

if __name__ == "__main__":

    if len(sys.argv) > 1 and sys.argv[1] != "-":
        for f in sys.argv[1:]:
            with open(f) as fp:
                res = parse_ics_file(fp)

            if res:
                with open(f, 'w') as fp:
                    fp.write(res.decode('utf-8'))

    else:
        print(parse_ics_file(sys.stdin))