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from nexusproto.serialization import from_shaped_array, to_shaped_array

from sdap.processors import NexusTileProcessor


class KelvinToCelsius(NexusTileProcessor):
    def process_nexus_tile(self, nexus_tile):
        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) - 273.15

        the_tile_data.variable_data.CopyFrom(to_shaped_array(var_data))

        yield nexus_tile