"""Knowledge Base Writer — 마크다운 파일 저장 마이크로서비스 (port 8095)

DEVONthink AppleScript 브릿지 대체. 순수 파일 I/O로 knowledge-base/ 에 마크다운 저장.
DEVONthink에서는 인덱스 그룹으로 읽기만 하면 됨.
"""

import logging
import re
import unicodedata
from datetime import datetime, timezone, timedelta
from pathlib import Path

from fastapi import FastAPI, Request
from fastapi.responses import JSONResponse

logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s")
logger = logging.getLogger("kb_writer")

KST = timezone(timedelta(hours=9))
BASE_DIR = Path(__file__).resolve().parent / "knowledge-base"

app = FastAPI()


def _slugify(text: str, max_len: int = 50) -> str:
    """한글 + 영문 친화적 슬러그 생성."""
    text = unicodedata.normalize("NFC", text)
    text = re.sub(r"[^\w가-힣\s-]", "", text)
    text = re.sub(r"[\s_]+", "-", text).strip("-")
    return text[:max_len] or "untitled"


@app.post("/save")
async def save(request: Request):
    body = await request.json()
    title = body.get("title", "Untitled")
    content = body.get("content", "")
    doc_type = body.get("type", "note")  # note | chat-memory | news
    tags = body.get("tags", [])
    username = body.get("username", "unknown")
    topic = body.get("topic", "general")
    source = body.get("source", "synology-chat")

    now = datetime.now(KST)
    month_dir = now.strftime("%Y-%m")
    date_str = now.strftime("%Y-%m-%d")
    iso_str = now.isoformat()

    # 파일명 생성
    slug = _slugify(title)
    if doc_type == "chat-memory":
        time_str = now.strftime("%H%M")
        filename = f"{date_str}T{time_str}-{_slugify(topic)}.md"
    elif doc_type == "news":
        filename = f"{date_str}-{_slugify(source)}-{slug}.md"
    else:
        filename = f"{date_str}-{slug}.md"

    # 디렉토리 생성
    type_dir = BASE_DIR / doc_type / month_dir
    type_dir.mkdir(parents=True, exist_ok=True)

    # 중복 파일명 처리
    filepath = type_dir / filename
    counter = 1
    while filepath.exists():
        stem = filename.rsplit(".", 1)[0]
        filepath = type_dir / f"{stem}-{counter}.md"
        counter += 1

    # YAML frontmatter + 본문
    tags_yaml = ", ".join(f'"{t}"' for t in tags)
    qdrant_id = int(now.timestamp() * 1000)

    md_content = f"""---
title: "{title}"
date: "{iso_str}"
source: {source}
type: {doc_type}
tags: [{tags_yaml}]
username: {username}
topic: {topic}
qdrant_id: {qdrant_id}
---

{content}
"""

    try:
        filepath.write_text(md_content, encoding="utf-8")
        logger.info(f"Saved: {filepath.relative_to(BASE_DIR)}")
        return JSONResponse({
            "success": True,
            "path": str(filepath.relative_to(BASE_DIR)),
            "filename": filepath.name,
            "qdrant_id": qdrant_id,
        })
    except Exception as e:
        logger.error(f"Save failed: {e}")
        return JSONResponse({"success": False, "error": str(e)}, status_code=500)


@app.get("/health")
async def health():
    kb_exists = BASE_DIR.is_dir()
    return {"status": "ok", "knowledge_base_exists": kb_exists}