/*
 * Copyright 2013-present the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.cloud.integration.storage.service.impl;

import java.sql.Timestamp;

import com.alibaba.cloud.integration.common.BusinessException;
import com.alibaba.cloud.integration.common.Result;
import com.alibaba.cloud.integration.storage.mapper.StorageMapper;
import com.alibaba.cloud.integration.storage.service.StorageService;
import org.apache.seata.core.context.RootContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * @author TrevorLink
 */
@Service
public class StorageServiceImpl implements StorageService {

	private Logger logger = LoggerFactory.getLogger(getClass());

	@Autowired
	private StorageMapper storageMapper;

	@Override
	@Transactional
	public void reduceStock(String commodityCode, Integer count)
			throws BusinessException {
		logger.info("[reduceStock] current XID: {}", RootContext.getXID());

		checkStock(commodityCode, count);

		Timestamp updateTime = new Timestamp(System.currentTimeMillis());
		int updateCount = storageMapper.reduceStock(commodityCode, count, updateTime);
		if (updateCount == 0) {
			throw new BusinessException("deduct stock failed");
		}
	}

	@Override
	public Result<?> getRemainCount(String commodityCode) {
		Integer stock = storageMapper.getStock(commodityCode);
		if (stock == null) {
			return Result.failed("commodityCode wrong,please check commodity code");
		}
		return Result.success(stock);
	}

	private void checkStock(String commodityCode, Integer count)
			throws BusinessException {
		Integer stock = storageMapper.getStock(commodityCode);
		if (stock < count) {
			throw new BusinessException("no enough stock");
		}
	}

}
