"""Small IO helpers used by the pipeline."""

from __future__ import annotations

import json
import os
import tempfile
from pathlib import Path
from typing import Iterable, Iterator


def atomic_write_text(path: str | Path, text: str) -> None:
    path = Path(path)
    path.parent.mkdir(parents=True, exist_ok=True)
    with tempfile.NamedTemporaryFile(
        mode="w", dir=path.parent, delete=False, suffix=".tmp"
    ) as tmp:
        tmp.write(text)
        tmp.flush()
        os.fsync(tmp.fileno())
        tmp_path = tmp.name
    os.replace(tmp_path, path)


def write_jsonl(path: str | Path, rows: Iterable[dict]) -> None:
    lines = "\n".join(json.dumps(row, sort_keys=True, ensure_ascii=False) for row in rows)
    if lines:
        lines += "\n"
    atomic_write_text(path, lines)


def read_jsonl(path: str | Path) -> Iterator[dict]:
    with open(path) as f:
        for line in f:
            line = line.strip()
            if line:
                yield json.loads(line)