APP搜索 代金卷

# 检查代金券是否可用
def is_coupon_valid(coupon_id, user_id, order_amount):
    coupon = get_coupon_info(coupon_id)  # 获取代金券信息
    if not coupon or coupon['user_id'] != user_id:
        return False, "Invalid coupon"
    if coupon['expired']:
        return False, "Coupon has expired"
    if order_amount < coupon['min_amount']:
        return False, "Order amount is below minimum required"
    return True, "Coupon is valid"

# 使用代金券抵扣订单金额
def apply_coupon_to_order(coupon_id, user_id, order_amount):
    valid, message = is_coupon_valid(coupon_id, user_id, order_amount)
    if not valid:
        return message
    discount = min(coupon['amount'], order_amount)
    final_amount = order_amount - discount
    update_order_amount(user_id, final_amount)  # 更新订单金额
    return f"Discount applied. Final amount: {final_amount}"