#!/usr/bin/env python3
"""Thin CLI over ``shared.changelog`` for the release workflow.

Keeps all changelog parsing in one tested module instead of inline shell/Python
in the workflow. Reads the changelog file given as an argument.

Usage:
    changelog_cli.py top-version <file>            # newest entry's version
    changelog_cli.py bump-kind  <file> <prev>      # major|minor|patch|none vs <prev>
    changelog_cli.py payload    <file> <version>   # JSON {version, notes, date_label}
"""

import json
import pathlib
import sys

sys.path.insert(0, str(pathlib.Path(__file__).resolve().parents[1] / "src" / "shared"))

from shared.changelog import bump_kind, entry_for, top_version  # noqa: E402


def main(argv: list[str]) -> int:
    if len(argv) < 3:
        sys.exit(__doc__)
    cmd, path = argv[1], argv[2]
    text = pathlib.Path(path).read_text()

    if cmd == "top-version":
        sys.stdout.write(top_version(text) or "")
    elif cmd == "bump-kind":
        prev = argv[3].lstrip("v")
        top = top_version(text)
        sys.stdout.write((bump_kind(top, prev) or "none") if top else "none")
    elif cmd == "payload":
        version = argv[3].lstrip("v")
        entry = entry_for(text, version)
        sys.stdout.write(
            json.dumps(
                {
                    "version": version,
                    "notes": entry.body if entry else "",
                    "date_label": entry.date_label if entry else "",
                }
            )
        )
    else:
        sys.exit(f"unknown command: {cmd}")
    return 0


if __name__ == "__main__":
    raise SystemExit(main(sys.argv))