# -*- coding: ansi -*-

def timetosec(time_str):
    parts = time_str.split(':')
    parts = [int(p) for p in parts]
    
    if len(parts) == 3:  # HH:MM:SS
        hours, minutes, seconds = parts
    elif len(parts) == 2:  # MM:SS
        hours = 0
        minutes, seconds = parts
    elif len(parts) == 1:  # SS
        hours = 0
        minutes = 0
        seconds = parts[0]
    else:
        raise ValueError("Zeitformat")
    
    total_seconds = hours * 3600 + minutes * 60 + seconds
    return total_seconds

print(timetosec("02:15:30"))  # 8130
print(timetosec("15:30"))     # 930
print(timetosec("45"))        # 45


def format_seconds(seconds: int) -> str:
    """
    Meine Interpretation von dem Moodle eintrag. Der leer ist.
    Wandelt Sekunden in das nächst beste Format um
    :param  seconds -> int
    :returns str
    """
    if seconds < 0:
        return "falsche eingable"

    intervals = (
        ('Tag', 86400),      # 60*60*24
        ('Stunde', 3600),    # 60*60
        ('Minute', 60),
        ('Sekunde', 1),
    )

    result = []
    for name, count in intervals:
        value = seconds // count
        if value:
            seconds -= value * count
            if value == 1:
                result.append(f"{value} {name}")
            else:
                result.append(f"{value} {name}en")
    return ', '.join(result) if result else "0 Sekunden"

print(format_seconds(3661))   # 1std 1m 1s
print(format_seconds(86465))  # 1t 1m 5s 
print(format_seconds(59))     # 59s