#!/usr/bin/env python3
#
# Copyright 2022 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import sys
from urllib.parse import urlparse
from enum import Enum

from registry import RegistryClient


class UrlStability(Enum):
    STABLE = 1
    UNSTABLE = 2
    UNKNOWN = 3


def verify_stable_archive(url):
    parsed = urlparse(url)
    if parsed.scheme != "https" or parsed.hostname != "github.com":
        return UrlStability.UNKNOWN

    path_parts = parsed.path.split("/")

    if len(path_parts) > 3 and path_parts[3] == "releases" and path_parts[4] == "download":
        return UrlStability.STABLE

    return UrlStability.UNSTABLE


def main(argv=None):
    if argv is None:
        argv = sys.argv[1:]

    client = RegistryClient(".")

    has_failure = False
    for module_name, version in client.get_all_module_versions():
        source_url = client.get_source(module_name, version)["url"]
        stability = verify_stable_archive(source_url)
        if stability == UrlStability.UNSTABLE:
            has_failure = True
            print(f"Version `{version}` of module `{module_name}` is using an unstable source url: `{source_url}`")
            print(
                "You should use a release archive URL in the format of "
                "`https://github.com/<ORGANIZATION>/<REPO>/releases/download/<version>/<name>.tar.gz` "
                "to ensure the archive checksum stability."
            )
            print("See https://blog.bazel.build/2023/02/15/github-archive-checksum.html for more context.")

    if has_failure:
        sys.exit(1)


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