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from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

from functools import partial

from ansible import errors
from ansible.module_utils.common.text import formatters


def dehumanize_zfs_properties(data):
    ''' zfs module sometimes wrongly indicates changed=true in check mode if sizes use human-readable format '''
    try:
        from jinja2.runtime import Undefined

        if isinstance(data, Undefined):
            return data

        for prop, value in data.items():
            if prop in ['quota', 'refquota', 'reservation', 'refreservation', 'recordsize', 'volsize']:
                data[prop] = str(formatters.human_to_bytes(value))
        return data
    except Exception as e:
        raise errors.AnsibleFilterError("dehumanize_zfs_properties(): %s" % str(e))


class FilterModule(object):

    ''' zfs filters '''
    filter_map = {
        'dehumanize_zfs_properties': dehumanize_zfs_properties,
    }

    def filters(self):
        return self.filter_map