#!/usr/bin/env python3
import os
import re
import sys

from datetime import datetime

# DTSTART:20251130

for slug in sys.argv[1:]:
    ics_path = os.path.join("events", slug, "ics")
    ics_content = open(ics_path, "rb").read().decode("utf-8", errors="ignore")

    date_path = os.path.join("events", slug, "date")
    if os.path.exists(date_path):
        continue

    date = re.search(r"DTSTART:(\d+)", ics_content)
    assert date is not None
    date = date[1]

    dt = datetime.strptime(date, "%Y%m%d")
    with open(date_path, "w") as f:
        f.write(dt.isoformat())