#!/usr/bin/env python3
"""Print old->new commit SHA map by matching subject|author|email|date."""
from __future__ import annotations

import subprocess
import sys

ROOT = subprocess.check_output(["git", "rev-parse", "--show-toplevel"], text=True).strip()


def git(*args: str) -> str:
    return subprocess.check_output(["git", "-C", ROOT, *args], text=True).strip()


def signature(commit: str) -> str:
    return git("log", "-1", "--format=%s|%an|%ae|%ad", commit, "--date=iso-strict")


def main() -> int:
    old_hashes = git("log", "dev-old-linear", "--format=%H").splitlines()
    new_by_sig: dict[str, str] = {}
    for h in git("log", "dev", "--format=%H").splitlines():
        new_by_sig[signature(h)] = h

    print("old_sha\tnew_sha\tsubject")
    for old in reversed(old_hashes):
        sig = signature(old)
        new = new_by_sig.get(sig, "")
        subj = git("log", "-1", "--format=%s", old)
        print(f"{old[:12]}\t{new[:12] if new else 'NOT_FOUND'}\t{subj}")
    return 0


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