import pytz
from datetime import datetime, timedelta, date

# copied from a spreadsheet (so it's tab separated)
bdays = """

lastname 	firstname	07-May
lastname 	firstname	07-May
lastname	firstname	07-May
lastname	firstname	07-May
lastname 	firstname	07-May
lastname	firstname	07-May


""".strip().split('\n')

months = [
    "Jan",
    "Feb",
    "Mar",
    "Apr",
    "May",
    "Jun",
    "Jul",
    "Aug",
    "Sep",
    "Oct",
    "Nov",
    "Dec"
]

months = {m : i for i, m in enumerate(months)}

bdays = [[cell.strip() for cell in line.split("\t")] for line in bdays]

tzname = "Europe/Warsaw"
tz = pytz.timezone(tzname)


cal = """
BEGIN:VCALENDAR
VERSION:2.0
PRODID:Birthdays autogenerated
""".strip()

for sname, fname, bday_date in bdays:
    event = "BEGIN:VEVENT"
    day, month = bday_date.split('-')
    print(f'{sname:<16}|{fname:<16}|{day:>02}.{months[month]+1:>02}')

    event += "\nUID:" + str((fname+sname+bday_date).__hash__())
    event += "\nDTSTAMP;TZID=" + tzname + ":" + datetime.now(tz=tz).strftime("%Y%m%dT%H%M%S")
    event += "\nDTSTART;VALUE=DATE:" + f'{datetime.now().year}{months[month]+1:>02}{day:>02}'
    # event += "\n"
    event += "\nSUMMARY:" + f'🎂 {fname} {sname} birthday!'
    event += "\nRRULE:FREQ=YEARLY"
    event += "\nEND:VEVENT"
    print(event)
    cal += "\n" + event

cal += "\nEND:VCALENDAR"

with open("birthday_calendar.ical", 'w', encoding='utf-8') as f:
    f.write(cal)