# barbacompta - invoicing for dummies
# Copyright (C) 2019-2020 Entr'ouvert
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


from decimal import Decimal


def percentage(a, b):
    if b:
        return a / b * Decimal(100)
    return 'NaN'


def percentage_str(a, b):
    p = percentage(a, b)
    if isinstance(p, Decimal):
        return '%d %%' % p
    return p
