# Copyright 2023 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.
"""A script for updating the Go API file for fuchsia.
"""

import argparse
import os
import subprocess
import sys


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        '--api-file',
        help='The API file to update',
        type=argparse.FileType('r+'),
        required=True,
    )
    parser.add_argument(
        '--go-root',
        help='The GOROOT to use for checking the API ',
        required=True,
    )
    args = parser.parse_args()

    api = set(args.api_file.readlines())

    result = subprocess.run(
        [os.path.join(args.go_root, 'bin/go'), 'test', 'cmd/api', '-check'],
        text=True,
        stdout=subprocess.PIPE)
    for line in result.stdout.splitlines(keepends=True):
        if 'pkg syscall/zx' not in line:
            continue
        op = line[0]
        if op == '+':
            api.add(line[1:])
            continue
        if op == '-':
            api.remove(line[1:])
            continue
        raise f"unexpected input: '${line}'"

    args.api_file.truncate(0)
    args.api_file.seek(0)
    args.api_file.writelines(sorted(api))


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