"""
Ground Truth 타점·비중·자본 배분 모델 (일반화 명세).

타점 생성(ground_truth.py)과 자본 배분(position_sizing.py)의 공통 언어.
"""

from __future__ import annotations

from dataclasses import dataclass, field
from typing import Any

from config import (
    GT_BUY_BB_MAX,
    GT_BUY_MIN_BARS,
    GT_BUY_MIN_SWING_PCT,
    GT_BUY_PCT_LARGE_LEG,
    GT_BUY_PCT_SMALL_LEG,
    GT_LARGE_LEG_TOP_PCT,
    GT_MAX_BUYS_PER_LEG,
    GT_MAX_SELLS_PER_LEG,
    GT_MIN_ORDER_KRW,
    GT_SELL_SPLIT_GAP_PCT,
    GT_SELECTION_MODE,
)


@dataclass(frozen=True)
class GtEntrySpec:
    """
    매수 타점(leg 내 분할) 규칙.

    Attributes:
        pivot_kind: ZigZag 저점(trough).
        price_field: 체결가 = 봉 Low.
        weight_rule: 저가일수록 큰 비중 (1/price 정규화).
        max_per_leg: leg당 최대 매수 횟수.
        min_bars_gap: 분할 매수 최소 봉 간격.
    """

    pivot_kind: str = "trough"
    price_field: str = "Low"
    weight_rule: str = "inverse_price_normalized"
    max_per_leg: int = GT_MAX_BUYS_PER_LEG
    min_bars_gap: int = GT_BUY_MIN_BARS
    bb_filter: str = f"bb_pos <= {GT_BUY_BB_MAX}"


@dataclass(frozen=True)
class GtExitSpec:
    """
    매도 타점(leg 내 분할) 규칙.

    Attributes:
        pivot_kind: major swing 고점(peak).
        price_field: 체결가 = 봉 High.
        split_weights: 2회 분할 시 (65%, 35%).
        split_gap_pct: 2차 고점 인정 최소 괴리(%).
    """

    pivot_kind: str = "peak"
    price_field: str = "High"
    split_weights: tuple[float, float] = (0.65, 0.35)
    split_gap_pct: float = GT_SELL_SPLIT_GAP_PCT
    max_per_leg: int = GT_MAX_SELLS_PER_LEG


@dataclass(frozen=True)
class GtCapitalSpec:
    """
    체결 원화(amount_krw) 배분 규칙.

    Attributes:
        buy_formula: 총자산 × 최적매수율, 상한=가용현금.
        optimal_buy_rate: leg 내 남은 weight 비중.
        large_leg_top_pct: 수익률 상위 leg 비율.
        pct_large: 상위 leg 총자산 배분 스케일.
        pct_small: 그 외 leg 스케일.
        min_order_krw: 최소 체결 원화.
    """

    buy_formula: str = "min(total_asset * w_share * tier_scale, cash/(1+fee))"
    optimal_buy_rate: str = "weight / sum(remaining_buy_weights_in_leg)"
    large_leg_top_pct: float = GT_LARGE_LEG_TOP_PCT
    pct_large: float = GT_BUY_PCT_LARGE_LEG
    pct_small: float = GT_BUY_PCT_SMALL_LEG
    min_order_krw: float = float(GT_MIN_ORDER_KRW)
    sell_formula: str = "leg_qty * sell_weight * price (last sell = full leg_qty)"


@dataclass
class GroundTruthModel:
    """
    GT 전체 모델 (타점 + 비중 + 자본).

    Attributes:
        selection_mode: 타점 생성 모드.
        entry: 매수 명세.
        exit: 매도 명세.
        capital: 자본 배분 명세.
        leg: leg 정의.
    """

    selection_mode: str = GT_SELECTION_MODE
    entry: GtEntrySpec = field(default_factory=GtEntrySpec)
    exit: GtExitSpec = field(default_factory=GtExitSpec)
    capital: GtCapitalSpec = field(default_factory=GtCapitalSpec)
    leg_definition: str = (
        "이전 고점 매도 ~ 다음 고점 매도 구간 = leg_id; "
        "기간말 잔여 구간은 마지막 leg"
    )
    execution_order_chrono: str = (
        "amount_krw 배분·summary.pnl_pct = 시각순 체결(매도 후 현금 → 다음 매수 반영)"
    )
    execution_order_leg_block: str = (
        "JSON 저장 순서 = leg별 매수 전량 → 매도 전량 (차트·테이블 leg 정합)"
    )


def default_model() -> GroundTruthModel:
    """현재 config 기준 GT 모델."""
    return GroundTruthModel()


def compute_buy_weights_inverse_price(prices: list[float]) -> list[float]:
    """
    저점 매수 비중: score_i = 1/price_i → 합=1 정규화.

    Args:
        prices: leg 내 매수 후보 가격.

    Returns:
        weight 리스트 (합 ≈ 1).
    """
    if not prices:
        return []
    scores = [1.0 / max(p, 1e-9) for p in prices]
    s = sum(scores)
    return [x / s for x in scores] if s > 0 else [1.0 / len(prices)] * len(prices)


def sell_split_weights(n_sells: int) -> list[float]:
    """
    leg 매도 비중.

    Args:
        n_sells: 매도 횟수(1 또는 2).

    Returns:
        weight 리스트.
    """
    spec = GtExitSpec()
    if n_sells >= 2:
        return list(spec.split_weights)
    return [1.0]


def model_to_dict(model: GroundTruthModel | None = None) -> dict[str, Any]:
    """
    JSON·리포트용 모델 dict.

    Args:
        model: None이면 default.

    Returns:
        직렬화 dict.
    """
    m = model or default_model()
    return {
        "selection_mode": m.selection_mode,
        "leg_definition": m.leg_definition,
        "entry": {
            "pivot": m.entry.pivot_kind,
            "price": m.entry.price_field,
            "weight_rule": m.entry.weight_rule,
            "weight_formula": "w_i = (1/price_i) / sum(1/price_j)",
            "max_buys_per_leg": m.entry.max_per_leg,
            "min_bars_between_buys": m.entry.min_bars_gap,
            "bb_filter": m.entry.bb_filter,
        },
        "exit": {
            "pivot": m.exit.pivot_kind,
            "price": m.exit.price_field,
            "weight_rule": "fixed_split_or_full",
            "weights_two_sell": list(m.exit.split_weights),
            "split_gap_pct": m.exit.split_gap_pct,
            "max_sells_per_leg": m.exit.max_per_leg,
        },
        "capital": {
            "buy": m.capital.buy_formula,
            "optimal_buy_rate": m.capital.optimal_buy_rate,
            "large_leg_top_pct": m.capital.large_leg_top_pct,
            "pct_large_leg": m.capital.pct_large,
            "pct_small_leg": m.capital.pct_small,
            "min_order_krw": m.capital.min_order_krw,
            "sell": m.capital.sell_formula,
        },
        "execution": {
            "chrono": m.execution_order_chrono,
            "leg_block_json": m.execution_order_leg_block,
        },
    }


def summarize_leg_weights(trades: list[dict[str, Any]]) -> dict[str, Any]:
    """
    leg별 매수·매도 비중 합 검증용 요약.

    Args:
        trades: GT trade dict.

    Returns:
        leg_id → {buy_sum, sell_sum, n_buy, n_sell}.
    """
    legs: dict[int, dict[str, Any]] = {}
    for t in trades:
        lid = int(t.get("leg_id", 0))
        legs.setdefault(
            lid,
            {"buy_sum": 0.0, "sell_sum": 0.0, "n_buy": 0, "n_sell": 0},
        )
        w = float(t.get("weight", 0))
        if t.get("action") == "buy":
            legs[lid]["buy_sum"] += w
            legs[lid]["n_buy"] += 1
        elif t.get("action") == "sell":
            legs[lid]["sell_sum"] += w
            legs[lid]["n_sell"] += 1
    return legs