"""
규칙 발화 기반 고정 금액 체결 포트폴리오 시뮬 (GT HTML 카드·테이블용).
"""

from __future__ import annotations

from typing import Any

import pandas as pd

from config import (
    GT_INITIAL_CASH_KRW,
    LIVE_DAILY_KRW_MAX,
    LIVE_MAX_TRADES_PER_DAY,
    LIVE_ORDER_KRW,
    TRADING_FEE_RATE,
)


def select_capped_fires(fires: pd.DataFrame) -> pd.DataFrame:
    """
    일한도·회수 제한으로 체결 가능한 발화만 남깁니다.

    Args:
        fires: fire_outcomes (dt, side, close, rule_id …).

    Returns:
        체결된 발화 DataFrame.
    """
    if fires.empty:
        return fires
    df = fires.sort_values("dt").copy()
    df["ts"] = pd.to_datetime(df["dt"])
    df["day"] = df["ts"].dt.date.astype(str)
    taken: list[pd.DataFrame] = []
    for _, day_grp in df.groupby("day", sort=True):
        spent = 0.0
        n_trades = 0
        idxs: list[Any] = []
        for idx, _row in day_grp.iterrows():
            if n_trades >= LIVE_MAX_TRADES_PER_DAY:
                break
            if spent + LIVE_ORDER_KRW > LIVE_DAILY_KRW_MAX:
                break
            spent += LIVE_ORDER_KRW
            n_trades += 1
            idxs.append(idx)
        if idxs:
            taken.append(day_grp.loc[idxs])
    if not taken:
        return df.iloc[0:0]
    return pd.concat(taken, ignore_index=True)


def fires_to_trade_list(fires: pd.DataFrame) -> list[dict[str, Any]]:
    """
    발화 DataFrame을 포트폴리오 시뮬용 trade dict 리스트로 변환.

    Args:
        fires: 체결 대상 발화.

    Returns:
        dt, action, price 키를 가진 dict 리스트.
    """
    rows: list[dict[str, Any]] = []
    for _, r in fires.sort_values("dt").iterrows():
        rows.append(
            {
                "dt": str(r["dt"]),
                "action": r["side"],
                "price": float(r["close"]),
                "rule_id": r.get("rule_id", ""),
                "forward_ret_pct": float(r.get("forward_ret_pct", 0)),
            }
        )
    return rows


def simulate_fixed_order_portfolio(
    trades: list[dict[str, Any]],
    order_krw: float = LIVE_ORDER_KRW,
    initial_cash: float = GT_INITIAL_CASH_KRW,
    fee_rate: float = TRADING_FEE_RATE,
    last_price: float | None = None,
) -> dict[str, Any]:
    """
    매 체결마다 고정 원화 금액으로 매수·매도한 뒤 총평가·수익률을 계산합니다.

    Args:
        trades: 시간순 {dt, action, price}.
        order_krw: 1회 매수·매도 금액(원).
        initial_cash: 시작 현금.
        fee_rate: 수수료율.
        last_price: 미청산 평가 종가.

    Returns:
        simulate_truth_portfolio와 동일 키 구조.
    """
    cash = float(initial_cash)
    qty = 0.0
    total_fees = 0.0
    last_trade_price = last_price
    order = float(order_krw)

    for t in sorted(trades, key=lambda x: x["dt"]):
        action = t["action"]
        price = float(t["price"])
        if price <= 0:
            continue
        last_trade_price = price

        if action == "buy":
            amount = min(order, max(cash / (1.0 + fee_rate), 0.0))
            if amount <= 0:
                continue
            fee = amount * fee_rate
            cash -= amount + fee
            total_fees += fee
            qty += amount / price

        elif action == "sell" and qty > 0:
            sell_qty = min(qty, order / price)
            if sell_qty <= 0:
                continue
            gross = sell_qty * price
            fee = gross * fee_rate
            cash += gross - fee
            total_fees += fee
            qty -= sell_qty
            if qty < 1e-12:
                qty = 0.0

    mark_price = float(last_price if last_price is not None else last_trade_price or 0)
    holding_value = qty * mark_price
    final_asset = cash + holding_value
    pnl_krw = final_asset - initial_cash
    pnl_pct = pnl_krw / initial_cash * 100.0 if initial_cash else 0.0

    return {
        "initial_cash_krw": round(initial_cash, 0),
        "final_asset_krw": round(final_asset, 0),
        "pnl_krw": round(pnl_krw, 0),
        "pnl_pct": round(pnl_pct, 2),
        "total_fees_krw": round(total_fees, 0),
        "cash_krw": round(cash, 0),
        "holding_qty": round(qty, 6),
        "holding_value_krw": round(holding_value, 0),
        "mark_price": round(mark_price, 2),
        "fee_rate": fee_rate,
        "order_krw": round(order, 0),
        "trade_count": len(trades),
    }


def simulate_fixed_order_portfolio_steps(
    trades: list[dict[str, Any]],
    order_krw: float = LIVE_ORDER_KRW,
    initial_cash: float = GT_INITIAL_CASH_KRW,
    fee_rate: float = TRADING_FEE_RATE,
) -> list[dict[str, Any]]:
    """
    체결마다 현금·보유·총평가 스냅샷 (GT 테이블용).

    Args:
        trades: 시간순 trade dict.
        order_krw: 1회 체결 원화.
        initial_cash: 시작 현금.
        fee_rate: 수수료율.

    Returns:
        step dict 리스트.
    """
    cash = float(initial_cash)
    qty = 0.0
    order = float(order_krw)
    steps: list[dict[str, Any]] = []

    for t in sorted(trades, key=lambda x: x["dt"]):
        action = t["action"]
        price = float(t["price"])
        if price <= 0:
            continue

        if action == "buy":
            amount = min(order, max(cash / (1.0 + fee_rate), 0.0))
            if amount <= 0:
                continue
            fee = amount * fee_rate
            cash -= amount + fee
            qty += amount / price

        elif action == "sell" and qty > 0:
            sell_qty = min(qty, order / price)
            if sell_qty <= 0:
                continue
            gross = sell_qty * price
            fee = gross * fee_rate
            cash += gross - fee
            qty -= sell_qty
            if qty < 1e-12:
                qty = 0.0

        steps.append(
            {
                "dt": t["dt"],
                "action": action,
                "price": price,
                "rule_id": t.get("rule_id", ""),
                "forward_ret_pct": t.get("forward_ret_pct"),
                "cash_krw": round(cash, 0),
                "holding_qty": round(qty, 4),
                "total_asset_krw": round(cash + qty * price, 0),
            }
        )
    return steps