def create_event(username, title, members,
event_length=None, event_deadline=None):
"""
Create an event with the given details.
Parameters:
username (str): username of event creator
title (str): name of event
members ([str]): list of usernames of additional event members
event_length (int): event length in hours
event_deadline (datetime.date): latest desired event date
Returns:
event_id (int): unique ID of new event
Exceptions:
AuthError if any of:
the user is not logged in
InputError if any of:
username does not exist
a username in the members list does not exist
title is longer than 100 characters or empty
event_length is less than 1 or greater than 14 * 24 (fortnight)
event_deadline is a date in the past
"""
check_username(username)
for u in members:
check_username(u)
check_logged_in(username)
if not len(title) or len(title) > MAX_TITLE:
raise InputError("Title length is invalid")
if (event_length != None and
(event_length < MIN_EVENT or event_length > MAX_EVENT)):
raise InputError("Event length is invalid")
if event_deadline and event_deadline < datetime.now().date():
raise InputError("Event deadline is invalid")
new_event = Event(data.event_next_id, title, username)
data.event_next_id += 1
for u in members:
new_event.member_usernames.add(u)
new_event.event_length = event_length
new_event.event_deadline = event_deadline
data.events[new_event.event_id] = new_event
return new_event.event_id
