package com.tourguide.modules.order.domain;

import com.tourguide.modules.order.entity.TourOrder;

import java.math.BigDecimal;

/** 统一计算订单实付、累计退款和剩余可退款金额，兼容累计字段上线前的历史订单。 */
public final class RefundAmountCalculator {
    private RefundAmountCalculator() {
    }

    public static BigDecimal paidAmount(TourOrder order) {
        if (order == null) return BigDecimal.ZERO;
        BigDecimal amount = order.getPaymentAmount() == null ? order.getAmount() : order.getPaymentAmount();
        return amount == null ? BigDecimal.ZERO : amount.max(BigDecimal.ZERO);
    }

    public static BigDecimal refundedAmount(TourOrder order) {
        if (order == null) return BigDecimal.ZERO;
        if (order.getRefundedAmount() != null) return order.getRefundedAmount().max(BigDecimal.ZERO);
        if (order.getRefundAmount() != null
                && (RefundStatus.REFUNDED.matches(order.getRefundStatus())
                || RefundStatus.PARTIAL.matches(order.getRefundStatus())
                || OrderStatus.REFUNDED.matches(order.getStatus()))) {
            return order.getRefundAmount().max(BigDecimal.ZERO);
        }
        return BigDecimal.ZERO;
    }

    public static BigDecimal refundableAmount(TourOrder order) {
        return paidAmount(order).subtract(refundedAmount(order)).max(BigDecimal.ZERO);
    }
}