"""
Apex Trading Risk Guard
Hard enforcement of risk constraints defined in BLUEPRINT.md.
"""

from typing import Dict, Any, Tuple

class ApexRiskGuard:
    def __init__(self, config: Dict[str, Any]):
        self.config = config.get("risk_limits", {})
        self.max_drawdown = self.config.get("max_drawdown_percent", 1.5)
        self.max_trade_risk = self.config.get("max_single_trade_risk_percent", 0.5)
        self.max_positions = self.config.get("max_open_positions", 4)
        self.circuit_breaker_active = False

    def validate_order(self, order: Dict[str, Any], current_drawdown: float, open_position_count: int) -> Tuple[bool, str]:
        """
        Validates an incoming order against hard guardrails.
        Returns (is_approved: bool, reason: str).
        """
        if self.circuit_breaker_active:
            return False, "REJECTED: Circuit breaker is active."

        if current_drawdown >= self.max_drawdown:
            self.circuit_breaker_active = True
            return False, f"REJECTED & CIRCUIT BREAKER TRIGGERED: Drawdown {current_drawdown}% >= limit {self.max_drawdown}%"

        if open_position_count >= self.max_positions:
            return False, f"REJECTED: Maximum concurrent positions ({self.max_positions}) reached."

        order_risk_pct = order.get("risk_percent", 0.0)
        if order_risk_pct > self.max_trade_risk:
            return False, f"REJECTED: Order risk {order_risk_pct}% exceeds limit {self.max_trade_risk}%"

        return True, "APPROVED"

    def trip_kill_switch(self, reason: str):
        """Emergency hard stop."""
        self.circuit_breaker_active = True
        print(f"[APEX EMERGENCY KILL SWITCH] {reason}")