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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
#
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import datetime

from pytz import timezone

from sdap.processors import NexusTileProcessor

EPOCH = timezone('UTC').localize(datetime.datetime(1970, 1, 1))


class NormalizeTimeBeginningOfMonth(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)

        time = the_tile_data.time

        timeObj = datetime.datetime.utcfromtimestamp(time)

        timeObj = timeObj.replace(day=1, hour=0, minute=0, second=0, microsecond=0)

        timeObj = timezone('UTC').localize(timeObj)

        the_tile_data.time = int((timeObj - EPOCH).total_seconds())

        yield nexus_tile