#!/usr/bin/python3

"""calendar reminder

this logs into a caldav server and get a digest of all of the
events scheduled for next days. Good candidate to run from cron
"""

import sys
import os
from dotenv import load_dotenv

from datetime import timedelta, date
from os import environ
from urllib.parse import quote_plus
import caldav

load_dotenv()

# read parameters from dot env
USERNAME = os.getenv('CALDAV_USERNAME')
PASSWORD = os.getenv('CALDAV_PASSWORD')
BASE_URL = os.getenv('CALDAV_URL')
NEXT_DAYS = int(os.getenv('NEXT_DAYS'))


def fill_event(component, calendar) -> dict[str, str]:
    # quite some data is tossed away here - like, the recurring rule.
    cur = {}
    cur["calendar"] = f"{calendar}"
    cur["summary"] = component.get("summary")
    cur["description"] = component.get("description")
    # month/day/year time? Never ever do that!
    # It's one of the most confusing date formats ever!
    # Use year-month-day time instead ... https://xkcd.com/1179/
    cur["start"] = component.start.strftime("%m/%d/%Y %H:%M")
    endDate = component.end
    if endDate:
        cur["end"] = endDate.strftime("%m/%d/%Y %H:%M")
    return cur


def fill_todo(component, calendar) -> dict[str, str]:
    cur = {}
    cur["calendar"] = f"{calendar}"
    cur["summary"] = component.get("summary")
    cur["description"] = component.get("description")
    return cur


def display_event(event: dict[str, str]):
    print(event["start"] + " " + event["calendar"] + "/" + event["summary"])


def display_todo(todo: dict[str, str]):
    print("Todo : " + todo["summary"])


url = 'https://' + quote_plus(USERNAME) + ":" + quote_plus(PASSWORD) \
        + '@' + BASE_URL + quote_plus(USERNAME) + '/'
start = date.today()
end = start + timedelta(days=NEXT_DAYS)
client = caldav.DAVClient(url)
calendars = client.principal().calendars()

if not calendars:
    print("No calendars defined for " + USERNAME)
    sys.exit(0)

for cal in calendars:
    events = cal.search(event=True, start=start, end=end, expand=True) \
                + cal.search(todo=True)
    for event in events:
        for component in event.icalendar_instance.walk():
            if component.name == "VEVENT":
                display_event(fill_event(component, cal))
            elif component.name == "VTODO":
                display_todo(fill_todo(component, cal))

print(".")