# Copyright 2016 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import os
import shutil
import sys

# Ensures that the current version matches the last-produced version, which is
# stored in the version_file. If it does not, then the framework_root_dir is
# obliterated.
# Usage: python prepare_framework_version.py out/obj/version_file \
#                                            out/Framework.framework \
#                                            'A'


def PrepareFrameworkVersion(version_file, framework_root_dir, version):
    # Test what the current framework version is. Stop if it is up-to-date.
    try:
        with open(version_file, 'r') as f:
            current_version = f.read()
            if current_version == version:
                return
    except IOError:
        pass

    # The framework version has changed, so clobber the framework.
    if os.path.exists(framework_root_dir):
        shutil.rmtree(framework_root_dir)

    # Write out the new framework version file, making sure its containing
    # directory exists.
    dirname = os.path.dirname(version_file)
    if not os.path.isdir(dirname):
        os.makedirs(dirname, 0o700)

    with open(version_file, 'w+') as f:
        f.write(version)


if __name__ == '__main__':
    PrepareFrameworkVersion(sys.argv[1], sys.argv[2], sys.argv[3])
    sys.exit(0)