#!/usr/bin/env python3.8
# Copyright 2020 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
'''Reads the contents of a manifest file generated by the build and verifies
   that there are no collisions among destination paths.
   '''

import argparse
import json
import sys

# Import from the current directory.
import distribution_manifest


def main():
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument(
        '--input', help='Path to original manifest', required=True)
    parser.add_argument(
        '--output', help='Path to the updated manifest', required=True)
    parser.add_argument('--depfile', help='Path to GN style depfile')
    parser.add_argument(
        '--hermetic-inputs-file',
        metavar='INPUTS_FILE',
        help=
        'When used, only output the INPUTS_FILE which lists all inputs used ' +
        'by this command, instead of OUTPUT and DEPFILE.')
    args = parser.parse_args()

    with open(args.input, 'r') as input_file:
        contents = json.load(input_file)

    opened_files = set()
    entries, error = distribution_manifest.expand_manifest(
        contents, opened_files)
    if error:
        print(error, file=sys.stderr)
        return 1

    # NOTE: If --hermetic-inputs-file INPUTS_FILE is used, then
    # do not output the manifest file or a depfile, only generate an
    # inputs list file. See hermetrics_inputs_file in BUILDCONFIG.gn.
    if args.hermetic_inputs_file:
        with open(args.hermetic_inputs_file, 'w') as inputs_file:
            inputs_file.write('\n'.join(sorted(opened_files)))
    else:
        if args.output:
            with open(args.output, 'w') as output_file:
                json.dump(
                    [e._asdict() for e in sorted(entries)],
                    output_file,
                    indent=2,
                    sort_keys=True,
                    separators=(',', ': '))

        if args.depfile:
            with open(args.depfile, 'w+') as depfile:
                depfile.write(
                    '%s: %s\n' % (args.output, ' '.join(opened_files)))

    return 0


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