# time.py
# Steve Marschner (srm2), Lillian Lee (ljl2), and Walker White (wmw2)
# October 15, 2015
"""Lecture example: object representing the time of day."""

class Time(object):
    """Instances represent times of day.
    
    Instance Attributes:
        hour: hour of day    [int in 0..23]
        min:  minute of hour [int in 0..59]"""

    def __init__(self, hour, min):
        """Initializer: Creates the time hour:min. 
        
        Parameter hour: hour of day
        Precondition: hour is an int in 0.23
        
        Parameter min: minute of hour
        Precondition: min is an int in 0..59"""
        assert type(hour) == int, str(hour)+' is not an int'
        assert 0 <= hour and hour < 24, str(hour)+' is out of range 0..23'
        assert type(min) == int, str(min)+' is not an int'
        assert 0 <= min and min < 60, str(hour)+' is out of range 0..59'
        
        self.hour = hour
        self.min = min

    def increment(self, hours, mins):
        """Move <hours> hours and <mins> minutes into the future.
        
        Parameter hours: number of hours to move
        Precondition: hours is an int >= 0
        
        Parameter mins: number of minutes to move
        Precondition: mins an int in 0..59"""
        assert type(hours) == int, str(hours)+' is not an int'
        assert 0 <= hours, str(hours)+' is not >= 0'
        assert type(mins) == int, str(mins)+' is not an int'
        assert 0 <= mins and mins < 60, str(mins)+' is out of range 0..59'
        
        self.hour = self.hour + hours
        self.min = self.min + mins
        self.hour = self.hour + self.min / 60
        self.min = self.min % 60
        self.hour = self.hour % 24

    def isPM(self):
        """Returns: True if this time is noon or later; False otherwise."""
        return self.hour >= 12
    
    def __str__(self):
        """Returns: the time as a string in [H]H:MM 24-hour format."""
        return str(self.hour) + (':0' if self.min < 10 else ':') + str(self.min)


def demo_time():
    """Show off time in action"""
    t = Time(23,58)
    print t
    t.increment(0,3)
    print t
    t.increment(11,0)
    print t, t.isPM()
    t.increment(1, 59)
    print t, t.isPM()


if __name__ == '__main__':
    demo_time()