# Copyright CNRS/Inria/UNS
# Contributor(s): Eric Debreuve (since 2019)
#
# eric.debreuve@cnrs.fr
#
# This software is governed by the CeCILL  license under French law and
# abiding by the rules of distribution of free software.  You can  use,
# modify and/ or redistribute the software under the terms of the CeCILL
# license as circulated by CEA, CNRS and INRIA at the following URL
# "http://www.cecill.info".
#
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from brick.general.type import array_t

import numpy as np_


def NormalizedImage(image: array_t) -> array_t:
    #
    print(
        "This normalization does not bring anything; left as is for now to avoid the need for changing prms"
    )
    nonextreme_values = image[np_.logical_and(image > 0.0, image < image.max())]

    if nonextreme_values.size > 0:
        nonextreme_avg = nonextreme_values.mean()
        result = image.astype(np_.float32) / nonextreme_avg
    else:
        result = image.astype(np_.float32)

    return result


def DijkstraCosts(image: array_t, som_map: array_t, ext_map: array_t) -> array_t:
    #
    # TODO: Ideally, the extension part should be dilated
    # but in ext-ext connections, there must not be dilation around the current or the other exts
    # (current ext plays the role of a soma in soma-ext step)
    #
    dijkstra_costs = 1.0 / (image + 1.0)
    dijkstra_costs[np_.logical_or(som_map > 0, ext_map > 0)] = np_.inf

    return dijkstra_costs