'Calendar'

from time import sleep, strftime

grace = 'Grace'

calendar = {

}

def welcome():
  print 'Welcome ' + grace  + '!'
  print 'Calendar is opening...'
  sleep(1)
  print 'Today is ' + strftime('%A %B %d, %Y')
  print strftime('%H:%M:%S')
  sleep(1)
  print 'What would you like to do?'

def start_calendar():
  welcome()
  start = True
  while start:
    user_choice = raw_input('A to Add, U to Update, V to View, D to Delete, X to Exit: ')
    user_choice = user_choice.upper()
    if user_choice == 'V':
      if len(calendar.keys()) == 0:
        print 'Your calendar is empty.'
      else:
        print calendar
    elif user_choice == 'U':
      date = raw_input('What date? ')
      update = raw_input('Enter the update: ')
      calendar[date] = update
      print 'Update successful!'
      print calendar
    elif user_choice == 'A':
      event = raw_input('Enter event: ')
      date = raw_input('Enter date (MM/DD/YYYY): ')
      if int(len(date)) != 10 or int(date[6:]) < int(strftime('%Y')):
        print 'Invalid entry.'
        try_again = raw_input('Try again? Y for Yes, N for No: ')
        try_again = try_again.upper()
        if try_again == 'Y':
          continue
        else:
          start = False
      elif int(date[0:1]) <= int(strftime('%m')) and int(date[3:4]) < int(strftime('%d')) and int(date[6:]) == int(strftime('%Y')):
        print 'Invalid entry.'
        try_again = raw_input('Try again? Y for Yes, N for No: ')
        try_again = try_again.upper()
        if try_again == 'Y':
          continue
        else:
          start = False
      else:
        calendar[date] = event
        print 'Event was succesfully added!'
        print calendar
    elif user_choice == 'D':
      if len(calendar.keys()) < 1:
        print 'Your calendar is empty.'
      else:
        event = raw_input('What event? ')
        for date in calendar.keys():
          if event == calendar[date]:
            del calendar[date]
            print 'Event was succesfully deleted.'
            print calendar
          else:
            print 'Incorrect event.'
    elif user_choice == 'X':
      start = False
    else:
      print 'Invalid command entered.'
      start = False

start_calendar()