"""

Field classes.

"""

from django import forms

from django.utils.translation import ugettext_lazy as _

from django.core.exceptions import ValidationError

import logging

import time

import math

__all__ = (

    'LdtDurationField'

)

class LdtDurationField (forms.TimeField):

    """

    A field allowing to enter the duration format (eg: XhMM, XXhMM, HH:MM:SS)

    """

    default_error_messages = {

        'required': _(u'The duration field can not be empty.'),

        'invalid': _(u'Enter a valid duration format;'),

    }

    def __init__(self, formats, *args, **kwargs):

        self.formats = formats

        super(LdtDurationField, self).__init__(*args, **kwargs)

    def to_python(self, value):

        logging.debug(value)

        dur = value

        for format in self.formats:

            try:

                dur = time.strptime(dur, format)

                dur = dur.tm_hour*3600 + dur.tm_min*60 + dur.tm_sec

                dur = dur*1000

                break

            except:

        return dur

    def validate(self, value):

        if value==None or value=="":

            raise ValidationError(self.default_error_messages['required'])

        else: