"""OpenDART 공시 본문 수집.

키 없으면 SkippedMissingKey, 호출 측에서 skipped_missing_key 로 매핑.

사용 endpoint:
  - GET https://opendart.fss.or.kr/api/list.json    : 공시 목록 (기간/종목별)
  - GET https://opendart.fss.or.kr/api/document.xml : 공시 원문 (zip in xml wrapper)

여기서는 list.json만 받아서 title + url 만 저장. 본문 다운로드는 후속 단계에서
선택적으로 추가 (용량/속도 트레이드오프).
"""
from __future__ import annotations

import logging
from dataclasses import dataclass
from datetime import date, datetime
from typing import Any

import httpx
from tenacity import retry, retry_if_exception_type, stop_after_attempt, wait_exponential

from app.config import settings

logger = logging.getLogger(__name__)

DART_BASE = "https://opendart.fss.or.kr/api"
USER_AGENT = "stock_chart_site/0.1 (+personal)"


class SkippedMissingKey(RuntimeError):
    pass


@dataclass
class Disclosure:
    code: str           # corp 종목코드 (있을 경우)
    title: str
    url: str
    published_at: datetime


def _has_key() -> bool:
    return bool(settings.dart_api_key)


def _stock_code_to_corp_code_cache() -> dict[str, str]:
    """종목코드(6자리) -> corp_code(8자리) 매핑.

    실제 운영에서는 corpCode.xml.zip 을 받아서 캐시해야 하지만, list.json 은
    종목코드(stock_code)도 직접 받기 때문에 우선 빈 매핑으로 둔다.
    """
    return {}


@retry(
    stop=stop_after_attempt(3),
    wait=wait_exponential(multiplier=1, min=1, max=8),
    retry=retry_if_exception_type((httpx.HTTPError, httpx.TimeoutException)),
    reraise=True,
)
def fetch_disclosures(
    code: str,
    start: date,
    end: date | None = None,
    *,
    page_count: int = 100,
) -> list[Disclosure]:
    """종목별 공시 목록 가져오기."""
    if not _has_key():
        raise SkippedMissingKey("dart api_key missing")
    end = end or date.today()
    params = {
        "crtfc_key": settings.dart_api_key,
        "bgn_de": start.strftime("%Y%m%d"),
        "end_de": end.strftime("%Y%m%d"),
        "page_count": str(page_count),
        "stock_code": code,
    }
    with httpx.Client(timeout=15.0, headers={"User-Agent": USER_AGENT}) as cli:
        resp = cli.get(f"{DART_BASE}/list.json", params=params)
        resp.raise_for_status()
        data = resp.json()

    status = data.get("status")
    # status: '000' OK, '013' no data, '020' rate limit, etc
    if status == "013":
        return []
    if status and status != "000":
        raise RuntimeError(f"dart error: status={status} msg={data.get('message')}")

    out: list[Disclosure] = []
    for row in data.get("list", []) or []:
        rcept_no = row.get("rcept_no")
        if not rcept_no:
            continue
        title = (row.get("report_nm") or "").strip()
        url = f"https://dart.fss.or.kr/dsaf001/main.do?rcpNo={rcept_no}"
        try:
            published_at = datetime.strptime(row.get("rcept_dt", ""), "%Y%m%d")
        except ValueError:
            continue
        out.append(
            Disclosure(
                code=row.get("stock_code") or code,
                title=title,
                url=url,
                published_at=published_at,
            )
        )
    return out


def ping() -> dict[str, Any]:
    if not _has_key():
        return {"status": "skipped_missing_key"}
    try:
        # 어제 기준 1건만 조회 (sanity)
        from datetime import timedelta
        items = fetch_disclosures("005930", date.today() - timedelta(days=30), date.today(), page_count=1)
        return {"status": "ok", "sample_count": len(items)}
    except SkippedMissingKey:
        return {"status": "skipped_missing_key"}
    except Exception as exc:  # noqa: BLE001
        return {"status": "failed", "error": str(exc)}