"""
Apex Trading Engine Core
Event loop that receives signals, checks risk guardrails, and executes orders.
"""

import json
import os
import sys
from typing import Dict, Any

from pathlib import Path

SRC_DIR = Path(__file__).resolve().parent.parent
if str(SRC_DIR) not in sys.path:
    sys.path.insert(0, str(SRC_DIR))

try:
    from risk.risk_guard import ApexRiskGuard
    from strategies.momentum import MomentumStrategy
except ImportError:
    from ..risk.risk_guard import ApexRiskGuard
    from ..strategies.momentum import MomentumStrategy

class ApexEngine:
    def __init__(self, config_path: str):
        with open(config_path, 'r', encoding='utf-8') as f:
            self.config = json.load(f)

        self.risk_guard = ApexRiskGuard(self.config)
        self.momentum_strategy = MomentumStrategy(self.config.get("strategies", {}).get("momentum"))
        self.open_positions = []
        self.current_drawdown_pct = 0.0

    def process_tick(self, symbol: str, prices: list, volume: list) -> Dict[str, Any]:
        """Processes market data tick through strategy and risk guard."""
        signal = self.momentum_strategy.generate_signal(symbol, prices, volume)
        if not signal:
            return {"status": "NO_SIGNAL", "symbol": symbol}

        approved, reason = self.risk_guard.validate_order(
            signal,
            self.current_drawdown_pct,
            len(self.open_positions)
        )

        if not approved:
            return {"status": "REJECTED_BY_RISK", "reason": reason, "signal": signal}

        # Simulated Execution
        order_receipt = {
            "status": "EXECUTED",
            "symbol": signal["symbol"],
            "action": signal["action"],
            "fill_price": signal["price"],
            "strategy": signal["strategy"],
            "risk_status": "APPROVED"
        }
        self.open_positions.append(order_receipt)
        return order_receipt

if __name__ == "__main__":
    print("[APEX ENGINE] Liveness check passed. Engine ready.")