__author__ = 'joe'
"""
The class Clock is used to simulate a clock
"""

class Clock:
    def __init__ (self, hours, minutes, seconds):
        """
        The parameters hours, minutes, and seconds have to be integers and must satisfy the following equations:
        0 <= h < 24
        0 <= m < 60
        0 <= s < 60
        """

        self.setClock(hours, minutes, seconds)
    def setClock (self, hours, minutes, seconds):
        """
        The parameters hours, minutes, and seconds have to be integers and must satisfy the following equations:
        0 <= h < 24
        0 <= m < 60
        0 <= s < 60
        """
        if type(hours) == int and 0 <= hours and hours < 24:
            self._hours = hours
        else:
            raise TypeError("Hours have to be integers between 0 and 23!")
        if type(minutes) == int and 0 <= minutes and minutes < 60:
            self.__minutes = minutes
        else:
            raise TypeError("Minutes have to be integers between 0 and 59!")
        if type(seconds) == int and 0 <= seconds and seconds < 60:
            self.__seconds = seconds
        else:
            raise TypeError("Seconds have to be integers between 0 and 59!")

    def __str__(self):
        return "{0:02d}:{1:02d}:{2:02d}".format(self._hours,
                                                self.__minutes,
                                                self.__seconds)

    def tick(self):
        """
        This method lets the clock "tick", this means that the
        internal time will be advanced by one second.

        Examples:
        >>> x = Clock(12,59,59)
        >>> print(x)
        12:59:59
        >>> x.tick()
        >>> print(x)
        13:00:00
        >>> x.tick()
        >>> print(x)
        13:00:01
        """

        if self.__seconds == 59:
            self.__seconds = 0
            if self.__minutes == 59:
                self.__minutes = 0
                if self._hours == 23:
                    self._hours = 0
                else:
                    self._hours += 1
            else:
                self.__minutes += 1
        else:
            self.__seconds += 1


if __name__ == "__main__":
    x = Clock(12,59,59)
    print(x)
    x.tick()
    print(x)
    y = str(x)
    print(type(y))
    x.tick()
    print(x)