# -*- coding: utf-8 -*-
#
# Simple average
#
# Copyright 2020 Michael Buesch <m@bues.ch>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#

from uarray import array

class Average(object):
    def __init__(self, format, size, initial=0.0):
        self.__values = array(format, [initial] * size)
        self.__counts = array("H", [0] * size)

    def reset(self, initial=0.0):
        for i in range(len(self.__values)):
            self.__values[i] = initial
            self.__counts[i] = 0

    def add(self, index, value):
        self.__values[index] += value
        self.__counts[index] += 1

    def get(self, index, substitute=0.0):
        count = self.__counts[index]
        if count > 0:
            return self.__values[index] / count
        return substitute

# vim: ts=4 sw=4 expandtab