import os
from eon_date import eon_date
from eon_delta import eon_delta
from eon_helper import g_EXPONENT

def test_time( filename, time_regex=None, start_time=None, stop_time=None, strict=False):

	if filename == "" or time_regex == None or (start_time == None and stop_time == None):
		status = not strict
	else:
		try:
			time = eon_date(os.path.split(filename)[1],regex=time_regex)
			status = time.between(start_time,stop_time)
		except:
			status = not strict

	return status


#def eon_tzero(tzero=None):
#	How should the time origin be stored? Delta time? Date string?
#	old = eon_date.tzero
#	if tzero != None:
#		if not isinstance(tzero,eon_date):
#			raise EonError( '%s, tzero must be of type eon_date' )
#		eon_date.tzero = tzero
#	return old

def eon_julian(julian=None):
	old = eon_date.julian
	if julian != None:
		eon_date.julian = julian
	return old

def eon_tz(tz=None,exponent=g_EXPONENT):
	old = eon_date.tz
	if tz != None:
		eon_date.tz = eon_delta(tz=tz,exponent=g_EXPONENT)
	return old

def tz_delta(tz=None,exponent=g_EXPONENT):
	if tz == None:
		from time import gmtime, localtime
		dt = (eon_date(localtime(),exponent=exponent)-eon_date(gmtime(),exponent=exponent)).round(eon_delta(minute=1,exponent=exponent))
	else:
		dt = eon_delta(tz=tz,exponent=exponent)

	return dt