主机优惠券

def apply_coupon(total_amount, coupon_code):
    # 假设有一个数据库或API来验证和处理优惠券
    coupon_info = validate_coupon(coupon_code)
    
    if not coupon_info:
        return total_amount, "Invalid coupon code"
    
    if coupon_info['expiry_date'] < datetime.now():
        return total_amount, "Coupon has expired"
    
    if total_amount < coupon_info['min_purchase']:
        return total_amount, "Purchase amount is below minimum required"
    
    discounted_amount = total_amount - coupon_info['discount']
    return discounted_amount, "Coupon applied successfully"

def validate_coupon(coupon_code):
    # 这里应该是查询数据库或调用API验证优惠券的逻辑
    # 示例返回一个固定的优惠券信息
    return {
        'code': coupon_code,
        'discount': 50,  # 优惠金额
        'min_purchase': 100,  # 最低消费金额
        'expiry_date': datetime(2023, 12, 31)  # 过期日期
    }

# 示例使用
total = 150
coupon = "SAVE50"
new_total, message = apply_coupon(total, coupon)
print(f"New Total: {new_total}, Message: {message}")