#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright © 2020 seamus tuohy, <code@seamustuohy.com>
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the included LICENSE file for details.

# ========== NOTES  ========================
# - This does not deal with ics attachments because python icalendar doesn't handle them well

# - Example Mailcap entry below (Remove the # in front of it.)
#
# text/calendar; python3 ~/PATH/TO/ical_simple_parse.py -i %s


import argparse
# To install icalendar run the following
# sudo -H pip3 install icalendar
import icalendar

import logging
logging.basicConfig(level=logging.ERROR)
log = logging.getLogger(__name__)


def main():
    args = parse_arguments()
    set_logging(args.verbose, args.debug)
    raw_ical_data = load_file(args.ical_file)
    ical_obj = icalendar.Event.from_ical(raw_ical_data)
    event_info = {}
    for _obj in ical_obj.walk():
        if isinstance(_obj, icalendar.cal.Event):
            log.debug("Available Ical keys are {0}".format(_obj.keys())
            event_info['attendees'] = [str(i.strip("mailto:")) for i in _obj.get('ATTENDEE',[])]
            event_info['summary'] = str(_obj.get('SUMMARY',"UNKNOWN"))
            event_info['location'] = str(_obj.get('LOCATION',"UNKNOWN"))
            event_info['status'] = str(_obj.get('STATUS',"UNKNOWN"))
            event_info['organizer'] = str(_obj.get('ORGANIZER',"UNKNOWN")).strip("mailto:")
            event_info['ends'] = _obj['DTEND'].dt.strftime("%H:%M %A, %B %e, %Y %Z/%z")
            event_info['starts'] = _obj['DTSTART'].dt.strftime("%H:%M %A, %B %e, %Y %Z/%z")
            event_info['description'] = _obj.get('DESCRIPTION', "NONE")
    formatted = format_event(event_info)
    print(formatted)

def format_event(event):
    txt = ""
    txt += "\nSUMMARY: {0}".format(event['summary'])
    txt += "\nSTATUS: {0}".format(event['status'])
    txt += "\nSTARTS: {0}".format(event['starts'])
    txt += "\nENDS: {0}".format(event['ends'])
    txt += "\nLOCATION: {0}".format(event['location'])
    txt += "\nORGANIZER: {0}".format(event['organizer'])
    if len(event['attendees']) > 0:
        txt += "\nATTENDEES:"
        for i in event['attendees']:
            txt += "\n  - {0}".format(i)
    txt += "\n===== DESCRIPTION =====\n\n"
    txt += event['description']
    return txt

def load_file(path):
    with open(path, 'rb') as fp:
        return fp.read()

# Command Line Functions below this point

def set_logging(verbose=False, debug=False):
    if debug == True:
        log.setLevel("DEBUG")
    elif verbose == True:
        log.setLevel("INFO")

def parse_arguments():
    parser = argparse.ArgumentParser("package name")
    parser.add_argument("--verbose", "-v",
                        help="Turn verbosity on",
                        action='store_true')
    parser.add_argument("--debug", "-d",
                        help="Turn debugging on",
                        action='store_true')
    parser.add_argument("--ical_file", "-i",
                        help="path to ical file",
                        required=True)
    args = parser.parse_args()
    return args

if __name__ == '__main__':
    main()