"""Сохранение темы в JSONL. Ротация каждые TOPICS_PER_FILE тем."""

import json, logging
from datetime import datetime
from pathlib import Path
from .config import TOPICS_PER_FILE

OUTPUT_DIR = Path("vwts_data")
log = logging.getLogger(__name__)


def save_topic(section_slug: str, section_name: str, topic: dict,
               posts: list, tags: list, state: dict):
    """Записать тему в part_XXXX.jsonl. Ротирует файл каждые N тем."""
    st = state

    # ротация
    if st["topic_count"] > 0 and st["topic_count"] % TOPICS_PER_FILE == 0:
        st["file_index"] += 1

    record = {
        "section": section_name,
        "topic_id": topic["id"],
        "topic_title": topic["title"],
        "topic_url": topic["url"],
        "total_posts": len(posts),
        "posts": posts,
        "tags": tags,
        "scraped_at": datetime.now().isoformat(),
    }

    d = OUTPUT_DIR / section_slug
    d.mkdir(parents=True, exist_ok=True)
    fpath = d / f"part_{st['file_index']:04d}.jsonl"

    with open(fpath, "a", encoding="utf-8") as fh:
        fh.write(json.dumps(record, ensure_ascii=False) + "\n")

    st["topic_count"] += 1
    log.info(f"      💾 part_{st['file_index']:04d}.jsonl "
             f"({fpath.stat().st_size/1024/1024:.1f} MB)")