import time
import os
import constants
from datetime import datetime

def timestamp():
    t = datetime.fromtimestamp(time.time())
    return t.strftime('%d/%b/%Y:%H:%M:%S%Z')

def describe_age_of_file(filename):
    try:
        now = time.time()
        ts = os.stat(filename).st_ctime
        age = now - ts
        return describe_duration(age)
    except Exception as e:
        return "?????"

def describe_age_of_file_briefly(filename):
    try:
        now = time.time()
        ts = os.stat(filename).st_ctime
        age = now - ts
        return describe_duration_briefly(age)
    except Exception as e:
        return "?????"

def describe_duration(age):
    days = divmod(age, constants.seconds_per_day)
    hours = divmod(days[1], constants.seconds_per_hour)
    minutes = divmod(hours[1], constants.seconds_per_minute)

    descr = ""
    if (days[0] > 1):
        descr = "%d days, " % days[0]
    elif (days[0] == 1):
        descr = "1 day, "
    if (hours[0] > 1):
        descr = descr + ("%d hours, " % hours[0])
    elif (hours[0] == 1):
        descr = descr + "1 hour, "
    if (len(descr) > 0):
        descr = descr + "and "
    if (minutes[0] == 1):
        descr = descr + "1 minute"
    else:
        descr = descr + ("%d minutes" % minutes[0])
    return descr

def describe_duration_briefly(age):
    days = divmod(age, constants.seconds_per_day)
    hours = divmod(days[1], constants.seconds_per_hour)
    minutes = divmod(hours[1], constants.seconds_per_minute)
    descr = ""
    if (days[0] > 0):
        descr = "%dd " % days[0]
    if (hours[0] > 0):
        descr = descr + ("%dh " % hours[0])
    descr = descr + ("%dm" % minutes[0])
    return descr

#x = describe_age_of_file_briefly("pages/clock_10_none.html")
#print x