from __future__ import annotations

import base64
import io
import json
import re
import subprocess
import unicodedata
from datetime import datetime, timezone
from pathlib import Path
from typing import Any

import matplotlib.pyplot as plt


def slugify(text: str) -> str:
    normalized = unicodedata.normalize("NFKD", text).encode("ascii", "ignore").decode("ascii")
    return re.sub(r"_+", "_", re.sub(r"[^A-Za-z0-9]+", "_", normalized.strip())).strip("_")


def fig_to_b64(fig) -> str:
    buffer = io.BytesIO()
    fig.savefig(buffer, format="png", dpi=170, bbox_inches="tight", facecolor=fig.get_facecolor())
    plt.close(fig)
    buffer.seek(0)
    return base64.b64encode(buffer.read()).decode("ascii")


def utc_now_iso() -> str:
    return datetime.now(timezone.utc).replace(microsecond=0).isoformat()


def git_commit(repo_root: Path) -> str | None:
    try:
        out = subprocess.check_output(
            ["git", "rev-parse", "HEAD"],
            cwd=repo_root,
            text=True,
            stderr=subprocess.DEVNULL,
        ).strip()
        return out
    except Exception:
        return None


def write_json(path: Path, payload: dict[str, Any]) -> None:
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(json.dumps(payload, ensure_ascii=False, indent=2), encoding="utf-8")