#!/usr/bin/python3 -s

# Parse modules.txt files into rpm .spec file Provides for bundled dependencies.
# Written by Fabio "decathorpe" Valentini <decathorpe@fedoraproject.org> for
# the fedora syncthing package: https://src.fedoraproject.org/rpms/syncthing
# SPDX-License-Identifier: CC0-1.0 OR Unlicense

# Modified by @gotmax23 to be used as a dependency generator
# SPDX-License-Identifier: GPL-3.0-or-later
# SPDX-FileCopyrightText: 2022 Maxwell G <gotmax@e.email>
#
# Minor modifications by Achilleas Koutsou <achilleas@koutsou.net> to be used in
# the rpm spec file generator for https://github.com/osbuild/osbuild-composer

import re
import sys


def process(path: str):
    with open(path, encoding="utf-8") as file:
        contents = file.read()

    lines = contents.split("\n")

    # dependencies = filter lines for "# package version"
    dependencies = list(filter(lambda line: line.startswith("# "), lines))

    # parse vendored dependencies into (import path, version) pairs
    vendored = []
    # Handle => style replace directives
    replace_regex = re.compile(r"^.+( v[0-9-\.]+)? => ")
    for dep in dependencies:
        fields = replace_regex.sub("", dep[2:]).split(" ")
        if len(fields) == 2:
            ipath, version = fields
        elif len(fields) == 1:
            ipath = fields[0]
            version = "HEAD"
        else:
            raise RuntimeError(f"Failed to parse dependency: {dep}")

        # check for git snapshots
        if len(version) > 27:
            # return only 7 digits of git commit hash
            version = version[-12:-1][0:7]
        else:
            # strip off leading "v"
            version = version.lstrip("v")

        vendored.append((ipath, version))

    for ipath, version in vendored:
        print(f"Provides: bundled(golang({ipath})) = {version}")


def main() -> None:
    files = sys.argv[1:]
    for file in files:
        process(file)


if __name__ == "__main__":
    main()