# Copyright 2005-2018 ECMWF.
#
# This software is licensed under the terms of the Apache Licence Version 2.0
# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
#
# In applying this licence, ECMWF does not waive the privileges and immunities
# granted to it by virtue of its status as an intergovernmental organisation
# nor does it submit to any jurisdiction.

#
# Python implementation: bufr_set_keys
#
# Description: how to set different type of keys in BUFR messages.
#
#

from __future__ import print_function
import traceback
import sys

from eccodes import *

INPUT = '../../data/bufr/syno_multi.bufr'
OUTPUT = 'bufr_set_keys_test_p.tmp.bufr'
VERBOSE = 1  # verbose error reporting


def example():
    # open BUFR file
    fin = open(INPUT)

    # open output BUFR file
    fout = open(OUTPUT, 'w')

    cnt = 0

    # loop for the messages in the file
    while 1:

        # get handle for message
        bufr = codes_bufr_new_from_file(fin)
        if bufr is None:
            break

        print("message: %s" % cnt)

        # we need to instruct ecCodes to expand all the descriptors
        # i.e. unpack the data values
        # codes_set(bufr,'unpack',1)

        # This is the place where you may wish to modify the message
        # E.g. we change the centre

        # set centre
        val = 222
        print('  set bufrHeaderCentre to: %d' % val)

        key = 'bufrHeaderCentre'
        try:
            print('  %s: %s' % (key, codes_set(bufr, key, val)))
        except CodesInternalError as err:
            print('Error with key="%s" : %s' % (key, err.msg))

        # check bufrHeaderCentre's value
        print('  %s''s new value is: %d' % (key, codes_get(bufr, key)))

        # write modified message to output
        codes_write(bufr, fout)

        cnt += 1

        # delete handle
        codes_release(bufr)

    fin.close()
    fout.close()


def main():
    try:
        example()
    except CodesInternalError as err:
        if VERBOSE:
            traceback.print_exc(file=sys.stderr)
        else:
            sys.stderr.write(err.msg + '\n')

        return 1


if __name__ == "__main__":
    sys.exit(main())
