def calculate_mortgage_payment(principal: float, annual_interest_rate: float, years: int) -> dict:
    """Calculates monthly mortgage payments.

    Args:
        principal: Initial loan amount.
        annual_interest_rate: Annual interest (percent).
        years: Loan term (years).
    Returns:
        dict: Status, payment breakdown, and error (if any).
    """
    try:
        monthly_rate = (annual_interest_rate / 100) / 12
        num_payments = years * 12

        if monthly_rate < 0 or principal <= 0 or num_payments <= 0:
            return {
                "status": "error",
                "error_message": "Inputs must be positive. Interest rate cannot be negative."
            }
        if monthly_rate == 0:
            monthly_payment = principal / num_payments
        else:
            monthly_payment = principal * (monthly_rate * (1 + monthly_rate) ** num_payments) / ((1 + monthly_rate) ** num_payments - 1)

        return {
            "status": "success",
            "monthly_payment": round(monthly_payment, 2),
            "total_payments": round(monthly_payment * num_payments, 2),
            "total_interest": round((monthly_payment * num_payments) - principal, 2),
            "principal": principal,
            "interest_rate": annual_interest_rate,
            "loan_term_years": years
        }
    except Exception as e:
        return {
            "status": "error",
            "error_message": f"Failed to calculate mortgage payment: {str(e)}"
        }

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