#!/usr/bin/env python3
"""ci/semver - next semver from conventional commits since the last tag.

  bin/ci/semver                      # last tag..HEAD
  bin/ci/semver v0.1.0 v0.1.0..HEAD  # explicit tag + range
  prints: v0.1.1 | v0.2.0 | v1.0.0 | none

  Bump rules (conventional commits):
    BREAKING CHANGE / feat!   -> major
    feat:                      -> minor
    fix:, perf:, refactor:,... -> patch
    no commits in range        -> none
"""
from __future__ import annotations

import subprocess
import sys
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parents[2] / "tools"))

from semver import bump_type, bump_version  # noqa: E402


def subjects_for(range_: str) -> list[str]:
    args = ["git", "log", "--format=%s"]
    if range_ and range_ != "HEAD":
        args.append(range_)
    try:
        out = subprocess.run(args, capture_output=True, text=True, check=True).stdout
    except subprocess.CalledProcessError:
        return []
    return [line.strip() for line in out.splitlines() if line.strip()]


def last_tag() -> str | None:
    try:
        out = subprocess.run(["git", "tag", "--sort=-v:refname"], capture_output=True, text=True, check=True).stdout
        tags = [t.strip() for t in out.splitlines() if t.strip().startswith("v")]
        return tags[0] if tags else None
    except subprocess.CalledProcessError:
        return None


def main(argv: list[str]) -> int:
    tag = argv[1] if len(argv) > 1 else last_tag()
    range_ = argv[2] if len(argv) > 2 else (f"{tag}..HEAD" if tag else "HEAD")
    print(bump_version(tag, bump_type(subjects_for(range_))) or "none")
    return 0


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