from datetime import datetime, time
import icalendar


def text_ical(user_id, tz):
    date = dt_now(tz)
    path = f'../data/icals/{user_id}.ics'

    e = open(path, 'rb')

    ecal = icalendar.Calendar.from_ical(e.read())
    events = []

    for i, component in enumerate(ecal.walk()):
        if component.name == "VEVENT":

            dt_start = component.decoded("dtstart")
            dt_start.replace(tzinfo=None)
            dt_start = dt_start.astimezone(tz)

            dt_end = component.decoded("dtend")
            dt_end.replace(tzinfo=None)
            dt_end = dt_end.astimezone(tz)
            
            if date.date() == component.decoded("dtstart").date():
                org = component.get("organizer")
                desc = component.get("description")

                event = {"name": component.get('summary'), "desc": desc if desc else "отсутствует",
                         "org": org if org else "не назначен", "datetime": [dt_start, dt_end]}

                events.append([dt_start.date(), dt_start.time(), i, event])
    e.close()

    return events


def message_form(k, event):
    txt = ""

    if k:
        txt += f"-------\n"
        txt += f"<b>{k}. {event['name']}</b>\n"
    else:
        txt += f"<b>{event['name']}</b>\n"

    txt += f"<b>Описание:</b> {event['desc']}\n"
    txt += f"<b>Организатор:</b> {event['org']}\n\n"
    txt += f"<b>Начало: {event['datetime'][0].strftime('%H:%M - %d.%m.%Y года')}</b>\n"
    txt += f"<b>Конец: {event['datetime'][1].strftime('%H:%M - %d.%m.%Y года')}</b>\n"

    return txt


def delta_time(d_event, start, end):
    d_start = datetime.combine(d_event.date(), time(hour=0, minute=start))
    d_end = datetime.combine(d_event.date(), time(hour=0, minute=end))

    zero = datetime.combine(d_event.date(), time(0, 0, 0, 0))

    dt_start = zero + (d_event - d_start)
    dt_end = zero + (d_event - d_end)

    return [dt_start.time(), dt_end.time()]


def dt_now(tz):
    return datetime.now(tz=tz)