import argparse
import bottle
import datetime

from . import google_calendar

import config

TEMPLATE_INDEX = bottle.SimpleTemplate(name = "templates/index.html")

# Template rendering

def last_day_of_month(date):
    date = date.replace(day = 28) + datetime.timedelta(days = 5)
    date = date.replace(day = 1)
    date = date - datetime.timedelta(days = 1)
    return date

def range_to_render(today):
    first_day_of_month = today.replace(day = 1)
    start = first_day_of_month - datetime.timedelta(days = first_day_of_month.weekday())
    end = last_day_of_month(today)
    return (start, end)

def render_calendar(events_map, today):
    days = []
    start, end = range_to_render(today)
    date = start
    while date <= end:
        days.append({
            'date': date,
            'is_weekend': date.isoweekday() == 6 or date.isoweekday() == 7,
            'week_of_year': int(date.strftime('%W')),
            'days_from_now': (date - today).days,
            'events': events_map.get(date, []),
        })
        date += datetime.timedelta(days = 1)

    header = today.strftime('%B %Y')
    return TEMPLATE_INDEX.render(days = days, header = header)

def get_events_map() -> tuple[dict[datetime.date, list[str]], datetime.date]:
    today = datetime.date.today()
    events_map = { }
    for prefix, url in config.ICAL_LINKS.items():
        for date, event in google_calendar.get_events_for_month(url, today):
            text = '{}: {}'.format(prefix, event.summary)
            events_map.setdefault(date, []).append(text)
            del date, event, text

    return events_map, today

## Paths

@bottle.route('/static/<path:path>')
def static(path):
    return bottle.static_file(path, root = './static')

@bottle.route('/')
def month_calendar():
    events_map, today = get_events_map()
    return render_calendar(events_map, today)


def main():
    ## Argument parsing
    parser = argparse.ArgumentParser()
    parser.add_argument('--hostname', action='store', default = 'localhost', dest='hostname')
    parser.add_argument('--port', action='store', default = 8080, dest='port', type = int)
    args = parser.parse_args()

    # Initialization
    bottle.run(host=args.hostname, port=args.port)

if __name__ == '__main__':
    main()