#!/usr/bin/env python 
# -*- Mode: python -*-
#======================================================================
# FILE: Duration.py
# CREATOR: eric 
#
# DESCRIPTION:
#   
#
#  $Id$
#  $Locker$
#
# (C) COPYRIGHT 2001, Eric Busboom <eric@softwarestudio.org>
# (C) COPYRIGHT 2001, Patrick Lewis <plewis@inetarena.com>  
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of either: 
#
#    The LGPL as published by the Free Software Foundation, version
#    2.1, available at: http://www.fsf.org/copyleft/lesser.html
#
#  Or:
#
#    The Mozilla Public License Version 1.0. You may obtain a copy of
#    the License at http://www.mozilla.org/MPL/
#===============================================================

from LibicalWrap import *
from Property import Property
from types import DictType, StringType, IntType

class Duration(Property):
    """ 
    Represent a length of time, like 3 minutes, or 6 days, 20 seconds.
    

    """

    def __init__(self, arg, name="DURATION"):
        """
        Create a new duration from an RFC2445 string or number of seconds.
        Construct the duration from an iCalendar string or a number of seconds.

        Duration("P3DT2H34M45S")   Construct from an iCalendar string
        Duration(3660)             Construct from seconds 
        """ 

        self.dur = None

        e=icalerror_supress("MALFORMEDDATA")

        if isinstance(arg, DictType):
            
            self.dur = icaldurationtype_from_string(arg['value'])
            Property.__init__(self,ref=arg['ref'])
        else:
            if isinstance(arg, StringType):
                self.dur = icaldurationtype_from_string(arg)
            elif isinstance(arg, IntType): 
                self.dur = icaldurationtype_from_int(arg)
            elif isinstance(arg,Duration):
                self.dur = arg.dur
            else:
                self.dur = icaldurationtype_null_duration()

            Property.__init__(self,type=name)

        icalerror_restore("MALFORMEDDATA",e)

        if self.dur == None or icaldurationtype_is_null_duration(self.dur):
            raise Property.ConstructorFailedError("Failed to construct Duration from " +str(arg))

        try:
            self._update_value()
        except Property.UpdateFailedError:
            raise Property.ConstructorFailedError("Failed to construct Duration from  " + str(arg))

    def _update_value(self):
        
        self.value(icaldurationtype_as_ical_string(self.dur),"DURATION")

    def valid(self):
        "Return true if this is a valid duration"

        return not icaldurationtype_is_null_duration(self.dur)

    def seconds(self,v=None):
        """Return or set duration in seconds"""
        if(v != None):
            self.dur = icaldurationtype_from_int(v);
            self.dict['value'] = icaltimedurationtype_as_ical_string(self.dur)
        return icaldurationtype_as_int(self.dur)