#!/usr/bin/env fuchsia-vendored-python
# 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.",
    )
    parser.add_argument(
        "--prefix",
        metavar="PREFIX",
        help="Prepend PREFIX to each destination path",
    )
    args = parser.parse_args()

    contents = ""
    with open(args.input, "r") as input_file:
        try:
            contents = json.load(input_file)
        except Exception as e:
            print("while reading:\n\t{}:\n\t{}".format(args.input, e))
            return 1

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

    if args.prefix:
        entries = [
            distribution_manifest.Entry(
                destination=args.prefix + entry.destination,
                source=entry.source,
                label=entry.label,
            )
            for entry in entries
        ]

    # 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())