import json
from datetime import datetime
from pathlib import Path


def artifact_last(state_file: str) -> str:
    data = json.loads(Path(state_file).read_text())
    items = sorted(
        data.items(),
        key=lambda x: x[1]["updated_at"],
        reverse=True
    )
    name, info = items[0]
    t = datetime.fromisoformat(info["updated_at"])
    age_h = int((datetime.now() - t).total_seconds() / 3600)

    return (
        "🧉 Last artifact\n\n"
        f"{name}\n"
        f"Updated: {t:%Y-%m-%d %H:%M}\n"
        f"Age: {age_h}h"
    )