"""prediction_outcomes 매칭 배치.

평일 16:30 KST 에 실행. 다음 거래일 장 종료 후 (KRX 정규장 마감 15:30) 의
확정 종가가 16:00~16:30 사이 pykrx 로 들어온 뒤, 매칭 미해결 예측을 실제
종가와 매칭한다.

이월/공휴일 정책:
  target_date 가 calendar date 라서 비거래일이면 ohlcv_daily 에 행이 없다.
  그래서 `target_date <= today` 인 미해결 행을 전부 후보로 잡고, 각 행마다
  `target_date <= ohlcv_daily.date <= today` 범위의 최초 거래일 종가로
  매칭한다 (=다음 거래일로 자동 이월).

shadow prediction 도 같은 방식으로 매칭한다 (user_triggered 필터 없음).
"""
from __future__ import annotations

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

from sqlalchemy import text

from app.db.connection import get_engine

logger = logging.getLogger(__name__)

# direction_hit 판정 시 ±0.3% 이내는 flat. (features 의 FLAT_BAND 와 동일)
FLAT_BAND = 0.003


@dataclass
class MatchSummary:
    today: str
    candidates: int
    matched: int
    skipped_no_actual: int
    already_resolved: int


def _direction_label(ret: float) -> str:
    if ret > FLAT_BAND:
        return "up"
    if ret < -FLAT_BAND:
        return "down"
    return "flat"


def match_up_to(today: date) -> MatchSummary:
    """target_date <= today 인 모든 미해결 예측을 매칭.

    각 행마다 ohlcv_daily 에서 target_date 이상, today 이하 범위의 최초
    거래일 종가를 actual_close 로 사용 — 공휴일/주말 이월 자연 처리.
    """
    eng = get_engine()
    with eng.begin() as conn:
        candidate_rows = conn.execute(
            text(
                """
                SELECT p.id, p.code, p.base_date, p.target_date, p.horizon,
                       p.point_forecast, p.direction, p.model
                  FROM predictions p
             LEFT JOIN prediction_outcomes po ON po.prediction_id = p.id
                 WHERE p.target_date <= :today
                   AND po.prediction_id IS NULL
                """
            ),
            {"today": today},
        ).all()
        candidates = len(candidate_rows)
        if not candidates:
            return MatchSummary(str(today), 0, 0, 0, 0)

        matched = 0
        skipped = 0
        already = 0
        for pid, code, base_date, target_date, horizon, point_forecast, pred_dir, model in candidate_rows:
            # 첫 거래일 종가 (target_date <= date <= today)
            actual_row = conn.execute(
                text(
                    """
                    SELECT date, close FROM ohlcv_daily
                     WHERE code = :c AND date >= :td AND date <= :today
                     ORDER BY date ASC
                     LIMIT 1
                    """
                ),
                {"c": code, "td": target_date, "today": today},
            ).first()
            if not actual_row or actual_row[1] is None:
                skipped += 1
                continue
            actual_date = actual_row[0]
            actual = float(actual_row[1])

            base_close_row = conn.execute(
                text("SELECT close FROM ohlcv_daily WHERE code = :c AND date = :d"),
                {"c": code, "d": base_date},
            ).first()
            if not base_close_row or base_close_row[0] is None:
                skipped += 1
                continue
            base_close = float(base_close_row[0])

            actual_ret = actual / base_close - 1.0
            actual_dir = _direction_label(actual_ret)
            dir_hit = (pred_dir == actual_dir)
            abs_err = abs(float(point_forecast) - actual) if point_forecast is not None else None

            try:
                conn.execute(
                    text(
                        """
                        INSERT INTO prediction_outcomes
                          (prediction_id, code, target_date, horizon, model,
                           predicted_close, actual_close, actual_return, direction_hit, abs_error)
                        VALUES
                          (:pid, :code, :d, :h, :m, :pc, :ac, :ar, :dh, :ae)
                        ON CONFLICT (prediction_id) DO NOTHING
                        """
                    ),
                    {
                        "pid": pid,
                        "code": code,
                        # 실제 매칭된 거래일 (이월된 경우 target_date 와 다를 수 있음)
                        "d": actual_date,
                        "h": horizon,
                        "m": model,
                        "pc": float(point_forecast) if point_forecast is not None else None,
                        "ac": actual,
                        "ar": float(actual_ret),
                        "dh": bool(dir_hit),
                        "ae": float(abs_err) if abs_err is not None else None,
                    },
                )
                matched += 1
            except Exception as exc:  # noqa: BLE001
                logger.warning("match insert failed pid=%s: %s", pid, exc)
                already += 1

        return MatchSummary(
            today=str(today),
            candidates=candidates,
            matched=matched,
            skipped_no_actual=skipped,
            already_resolved=already,
        )


# 하위 호환 alias — 이전 시그니처를 쓰던 호출자 (예: 단일 날짜 매칭 테스트)
def match_for_date(d: date) -> MatchSummary:
    """legacy: target_date == d 만 매칭하던 동작 → 이제 target_date <= d 전체 처리."""
    return match_up_to(d)


def match_today() -> dict[str, Any]:
    """평일 16:30 KST 호출용. target_date <= today (KST) 인 미해결 행 일괄 매칭."""
    from datetime import datetime, timezone, timedelta as td

    kst = timezone(td(hours=9))
    today = datetime.now(kst).date()
    summary = match_up_to(today)
    return {
        "today": str(today),
        "summary": summary.__dict__,
    }


if __name__ == "__main__":
    logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(name)s: %(message)s")
    out = match_today()
    print(json.dumps(out, ensure_ascii=False, indent=2, default=str))