Alarm Clock 4.1

# Alarm Clock 4.1

from time import ctime, clock, sleep
import winsound
import sys

def tadas_time(n):
    return round((int(n)-1) * 1.79 + 1, 1)

def get_num_tadas_from_user():
    try:
        print("Enter the number of taDAHs desired; Entering nothing will set the number to 1")
        n = input("\nHow many tadas?> ")
        if not n:
            print("The number of taDAHs was set to 1")
            return 1
        if int(n) < 1:
            print("The number of taDAHs must be at least 1, or the alarm won't sound")
            raise ValueError
        if int(n) > 3:
            print("Are you sure you want", n, "taDAHs? That will take", tadas_time(n), "seconds")
            print("Hit enter for 'yes'; enter any character if you want to change the number")
            ans = input("\nanswer?> ")
            if ans == '':
                print("The number of taDAHs was set to", n)
                return int(n)
            else:
                raise ValueError
        print("The number of taDAHs was set to", n)
        return int(n)
    except ValueError:
        # recursion
        return get_num_tadas_from_user()

def get_message_from_user():
    """
    The message is printed when the alarm rings.
    The idea is that the message will tell the user the reason
    for the alarm. Examples are, "Feed the cat", "Go to bed", "Write to Nick".
    """
    print("""
    Enter a message about what the alarm ringing means,
    in case you forget, or have several alarms set.
    Enter nothing if no message.
    """)
    message = input("\nMessage?> ")
    if message == '':
        print("no message entered")
        return None
    else:
        return message

def find_alpha(at):
    for char in at:
        if char.isalpha():
            return char
    return None

def get_alarm_time():
    alarm_time = input("alarm time?> ")
    at = alarm_time
    try:
        # User hits Enter before typing his alarm time
        if not at:
            raise ValueError
        # User thinks that hours and minutes should be separated by a space
        elif ' ' in at:
            print("Do not use a space anywhere in alarm time.")
            print("Use a colon to separate hours and minutes: 10:45, 03:07")
            print("Or use military time: 0915, 2115, 0003, 1203\n")
            raise ValueError
        # User somehow thinks alarm time should or could be negative
        elif at[0] == '-':
            print("alarm time cannot be negative.\n")
            raise ValueError
        # User enters +3:00. Possibly thinking he wants the alarm to ring 3 hours from now?\n"
        elif '+' in at:
            print("Do not use '+' anywhere in alarm time.\n")
            raise ValueError
        #User thinks he should use 'l' for '1'.
        elif 'l' in at:
            print("You've used an 'l' (lower case 'L') in your alarm time instead of the digit '1' (one).\n")
            raise ValueError
        # User enters 1o45 or ooo3
        elif 'o' in at:
            print("You've used the letter 'o' in your alarm time instead of the digit '0' (zero).\n")
            raise ValueError
        # User enters 1O45 or OOO3
        elif 'O' in at:
            print("You've used the letter 'O' in your alarm time instead of the digit '0' (zero).\n")
            raise ValueError
        # User uses an alphabetic letter other than the above o, O, or l
        char = find_alpha(at)
        if char:
            print("Do not use an alphabetic letter such as '", char, "' in alarm time.\n", sep='')
            raise ValueError

        elif len(at) == 5:
            # User enters 12345
            if at.isdigit():
                print("Military time should have exactly 4 digits, not 5.")
                print("0915, 2115, 0003, 1203\n")
                raise ValueError
            # User enters 10;45
            elif at[2] == ';' and at.replace(';', '').isdigit():
                print("You've used a semicolon between hours and minutes. Use a colon: 10:45, 03:07.\n")
                raise ValueError
            # User enters 10,45 or 10.45 or 10/45, or 10x45, etc.
            elif at[2] != ':' and at.replace(at[2], '').isdigit():
                print("Use a colon between hours and minutes: 10:45, 03:07\n")
                raise ValueError

        elif ':' not in at:
            # User enters 123 or 123456
            if len(at) != 4:
                print("Military time should have exactly 4 digits.")
                print("0915, 2115, 0003, 1203\n")
                raise ValueError

            elif not at.isdigit():
                print("There's a non-digit in either the hours or minutes or both.\n")
                raise ValueError

            at = at[:2] + ':' + at[2:]

        hour, minute = at.split(':')

        if not at.replace(':', '').isdigit():
            print("You've put a non-digit in either the hours or minutes or both.\n")
            raise ValueError

        elif len(hour) != 2 or len(minute) != 2:
            print("Both hours and minutes should have exactly 2 digits.")
            print("09:15, 21:15, 00:03, 12:03\n")
            raise ValueError

        elif int(hour) > 23:
            print("Hours must be 23 or less.\n")
            raise ValueError

        elif int(minute) > 59:
            print("Minutes must be 59 or less.\n")
            raise ValueError

        print("\nIs", at, "the time you want? Hit enter for 'yes'; enter any character for 'no'.")
        ans = input("\nanswer?> ")
        if ans == '':
            return at
        else:
            raise ValueError

    except ValueError:
        # recursion
        return get_alarm_time()

def get_alarm_time_from_user():
    print("""
    Enter an alarm time in 24-hour time.
    Both hours and minutes should be in 2 digits, separated by a colon.
    13:00, 22:45, 02:30, 00:05
    Military time will be converted to 24-hour time.
    1300 -> 13:00, 0005 -> 00:05
    """)
    return get_alarm_time()

def tada_or_tadas(num_tadas):
    """
    Make "tada" plural when appropriate.

    "tada" is one of the sounds that come with Windows: taDAH.
    """
    if num_tadas == 1:
        return "taDAH"
    else:
        return "taDAHs"

def time2seconds(alarm_time):
    """time_string format = hh:mm, returns seconds as int."""
    hour, minute = alarm_time.split(':')
    return int(hour)*3600 + int(minute)*60

def today_or_tomorrow(alarm_time):
    now = ctime()[11:16]
    if time2seconds(now) > time2seconds(alarm_time):
        return "tomorrow"
    else:
        return "today"

def print_summary(alarm_time, today_tomorrow, num_tadas, message):
    print("\nThe alarm is set to ring at", alarm_time, today_tomorrow)
    if message:
        print(" with ", num_tadas, " ", tada_or_tadas(num_tadas), " and message, '", message, "'", sep='')
    else:
        print("with", num_tadas, tada_or_tadas(num_tadas), "and no message.")

def display_current_time():
    """
    Prints the current time as 24-hour time -- but no seconds.
    13:07, 05:00, 23:59, 00:02, etc.
    Each printing overwrites the previous one.
    """
    sys.stdout.flush()
    print("The time now is", ctime()[11:16], "\r", end='')

def main():
    print("\n" * 9)

    # Get input from user.
    num_tadas = get_num_tadas_from_user()
    message = get_message_from_user()
    alarm_time = get_alarm_time_from_user()

    # Print summary of alarm info.
    today_tomorrow = today_or_tomorrow(alarm_time)
    print_summary(alarm_time, today_tomorrow, num_tadas, message)

    # Main loop (wait until alarm time).
    print()
    while alarm_time != ctime()[11:16]:
        sleep(0.1)
        display_current_time()

    # Sound alarm
    for tada in range(0, num_tadas):
        winsound.PlaySound("/P31Working/Sounds/TaDa", winsound.SND_ALIAS)

    # Display alarm message and close.
    if message:
        print("\nmessage:", message, "\n")
    print()
    print("Hit Enter to close Alarm Clock.")
    input()


if __name__ == '__main__':
    main()