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# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
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import numpy
from nexusproto.serialization import from_shaped_array, to_shaped_array

from sdap.processors import NexusTileProcessor


class DeleteUnitAxis(NexusTileProcessor):

    def __init__(self, dimension, *args, **kwargs):
        super().__init__(*args, **kwargs)

        self.dimension = dimension

    def process_nexus_tile(self, nexus_tile):
        axis = [x.split(':')[0] for x in nexus_tile.summary.section_spec.split(',')].index(self.dimension)

        the_tile_type = nexus_tile.tile.WhichOneof("tile_type")

        the_tile_data = getattr(nexus_tile.tile, the_tile_type)

        var_data = from_shaped_array(the_tile_data.variable_data)

        if numpy.size(var_data, axis) == 1:
            the_tile_data.variable_data.CopyFrom(to_shaped_array(numpy.squeeze(var_data, axis=axis)))
        else:
            raise RuntimeError("Cannot delete axis for dimension %s because length is not 1." % self.dimension)

        yield nexus_tile