"""validate_execution_simulator_v1.py — spec/55: H004_EXECUTION_SIMULATOR

Simulates tick normalization, minimum order quantity, cash floor, and
slippage checks for every order in the final_decision_packet.

formula_id: VALIDATE_EXECUTION_SIMULATOR_V1
contract:   spec/55_execution_simulator_contract.yaml
"""
from __future__ import annotations

import json
import math
import sys
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]

DEFAULT_PACKET  = ROOT / "Temp" / "final_decision_packet_active.json"
OUTPUT_PATH     = ROOT / "Temp" / "execution_simulator_v1.json"

# Simulation parameters from spec/55
SLIPPAGE_BPS          = 5
MINIMUM_RESERVE_KRW   = 10_000_000
GOAL_TARGET_KRW       = 500_000_000
D_PLUS_2_COUNTS       = True

# KRX tick table (spec/00 HS008 / spec/13_formula_registry TICK_NORMALIZER_V1)
TICK_TABLE = [
    (   2_000,    1),
    (   5_000,    5),
    (  20_000,   10),
    (  50_000,   50),
    ( 200_000,  100),
    ( 500_000,  500),
    (2_000_000, 1_000),
]
TICK_ABOVE_2M = 1_000

# Load names from GatherTradingData.json to detect ETF or US Stocks
TICKER_NAMES: dict[str, str] = {}
gtd_path = ROOT / "GatherTradingData.json"
if gtd_path.exists():
    try:
        gtd = json.loads(gtd_path.read_text(encoding="utf-8"))
        df_rows = gtd.get("data", {}).get("data_feed") or []
        for r in df_rows:
            if isinstance(r, dict) and r.get("Ticker"):
                TICKER_NAMES[str(r["Ticker"])] = str(r.get("Name") or "")
        univ_rows = gtd.get("data", {}).get("universe") or []
        for r in univ_rows:
            if isinstance(r, dict) and r.get("Ticker"):
                TICKER_NAMES[str(r["Ticker"])] = str(r.get("Name") or "")
    except Exception:
        pass


def _is_etf(ticker: str) -> bool:
    name = TICKER_NAMES.get(ticker, "").upper()
    return any(x in name for x in ["KODEX", "TIGER", "KBSTAR", "ARIRANG", "HANARO", "TIMEFOLIO", "SOL", "ACE", "PLUS"])


def _is_us_stock(ticker: str) -> bool:
    return str(ticker).isalpha()


def _load_json(path: Path) -> dict:
    if not path.exists():
        return {"_missing": True, "_path": str(path)}
    try:
        return json.loads(path.read_text(encoding="utf-8"))
    except Exception as e:
        return {"_error": str(e), "_path": str(path)}


def _tick_size(price: float, ticker: str) -> float:
    if _is_us_stock(ticker):
        return 0.01
    if _is_etf(ticker):
        return 5.0
    for threshold, tick in TICK_TABLE:
        if price < threshold:
            return tick
    return TICK_ABOVE_2M


def _normalize_tick(price: float, ticker: str) -> float:
    tick = _tick_size(price, ticker)
    return math.floor(price / tick) * tick


def _apply_slippage(price: float, side: str) -> float:
    factor = SLIPPAGE_BPS / 10_000
    if side == "BUY":
        return price * (1 + factor)
    return price * (1 - factor)


def _extract_orders(packet: dict) -> list[dict]:
    orders = []
    blueprint = packet.get("order_blueprint_json") or []
    if isinstance(blueprint, list):
        for order in blueprint:
            if isinstance(order, dict):
                orders.append(order)
    per_ticker = packet.get("per_ticker") or {}
    if isinstance(per_ticker, dict) and not orders:
        for ticker, data in per_ticker.items():
            if not isinstance(data, dict):
                continue
            action = str(data.get("final_action") or "").upper()
            if any(x in action for x in ("BUY", "SELL", "TRIM", "EXIT")):
                orders.append({
                    "ticker": ticker,
                    "action": action,
                    "price": data.get("entry_price") or data.get("close_price") or 0,
                    "quantity": data.get("final_qty") or data.get("sell_qty") or 0,
                    "validation_status": data.get("validation_status") or "UNKNOWN",
                })
    return orders


def _simulate_order(order: dict) -> dict:
    errors = []
    price = float(order.get("price") or 0)
    qty   = int(order.get("quantity") or order.get("qty") or 0)
    action = str(order.get("action") or order.get("order_type") or "").upper()
    side = "BUY" if "BUY" in action else "SELL"
    ticker = str(order.get("ticker") or "")

    # Tick normalization check
    if price > 0:
        normalized = _normalize_tick(price, ticker)
        if abs(normalized - price) > 0.01:
            errors.append(f"TICK_INVALID: price={price} → normalized={normalized}")
    else:
        errors.append("PRICE_MISSING")

    # Minimum quantity check
    if qty < 1:
        errors.append(f"QTY_BELOW_MIN: qty={qty} < 1")

    # Slippage-adjusted price
    slippage_price = _apply_slippage(price, side) if price > 0 else 0
    order_amount = slippage_price * qty

    return {
        "ticker": ticker,
        "action": action,
        "original_price": price,
        "normalized_price": _normalize_tick(price, ticker) if price > 0 else 0,
        "slippage_adjusted_price": round(slippage_price, 2) if _is_us_stock(ticker) else round(slippage_price, 0),
        "quantity": qty,
        "order_amount_krw": round(order_amount),
        "errors": errors,
        "valid": len(errors) == 0,
    }


def run(packet_path: Path) -> dict:
    packet = _load_json(packet_path)

    if packet.get("_missing"):
        result = {
            "gate": "SKIP",
            "reason": f"packet missing: {packet_path}",
            "invalid_order_count": 0,
            "cash_floor_after_orders_krw": 0,
            "slippage_adjusted_orders": [],
            "contract": "spec/55_execution_simulator_contract.yaml",
        }
        OUTPUT_PATH.parent.mkdir(parents=True, exist_ok=True)
        OUTPUT_PATH.write_text(json.dumps(result, ensure_ascii=False, indent=2))
        return result

    orders = _extract_orders(packet)
    simulated = [_simulate_order(o) for o in orders]

    invalid_count = sum(1 for s in simulated if not s["valid"])

    # Cash floor check
    cash_data   = packet.get("cash_recovery_plan_json") or {}
    available_cash = float(
        (cash_data.get("available_cash_krw") if isinstance(cash_data, dict) else None)
        or packet.get("available_cash_krw")
        or 0
    )
    buy_total = sum(
        s["order_amount_krw"] for s in simulated
        if "BUY" in str(s.get("action") or "").upper()
    )
    cash_after = available_cash - buy_total
    cash_floor_ok = (cash_after >= MINIMUM_RESERVE_KRW) if available_cash > 0 else True

    gate = "PASS"
    if invalid_order_count := invalid_count:
        gate = "FAIL"
    elif not cash_floor_ok:
        gate = "FAIL"

    result = {
        "gate": gate,
        "invalid_order_count": invalid_order_count,
        "cash_floor_after_orders_krw": round(cash_after),
        "cash_floor_ok": cash_floor_ok,
        "minimum_reserve_krw": MINIMUM_RESERVE_KRW,
        "available_cash_krw": available_cash,
        "buy_total_krw": buy_total,
        "slippage_adjusted_orders": simulated,
        "order_count": len(simulated),
        "contract": "spec/55_execution_simulator_contract.yaml",
    }

    OUTPUT_PATH.parent.mkdir(parents=True, exist_ok=True)
    OUTPUT_PATH.write_text(json.dumps(result, ensure_ascii=False, indent=2))
    return result


def main() -> None:
    import argparse
    parser = argparse.ArgumentParser(description="H004 Execution Simulator")
    parser.add_argument("--packet", default=str(DEFAULT_PACKET))
    args = parser.parse_args()

    result = run(Path(args.packet))
    gate = result.get("gate", "FAIL")
    print(f"[H004_EXECUTION_SIMULATOR] gate={gate} "
          f"orders={result.get('order_count', 0)} "
          f"invalid={result.get('invalid_order_count', 0)} "
          f"cash_floor_ok={result.get('cash_floor_ok', True)}")
    if gate == "FAIL":
        print("  Invalid orders:", [o for o in result.get("slippage_adjusted_orders", []) if not o.get("valid")])
        sys.exit(1)


if __name__ == "__main__":
    main()