/*
 *  Copyright 1999-2019 Seata.io Group.
 *
 *  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
 *
 *       http://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 io.seata.server.console.impl.redis;

import io.seata.common.util.CollectionUtils;
import io.seata.console.result.PageResult;
import io.seata.core.model.GlobalStatus;
import io.seata.server.console.param.GlobalSessionParam;
import io.seata.server.console.service.GlobalSessionService;
import io.seata.server.console.vo.GlobalSessionVO;
import io.seata.server.session.GlobalSession;
import io.seata.server.session.SessionCondition;
import io.seata.server.storage.redis.store.RedisTransactionStoreManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import static io.seata.common.exception.FrameworkErrorCode.ParameterRequired;
import static io.seata.common.util.StringUtils.isBlank;
import static io.seata.common.util.StringUtils.isNotBlank;
import static io.seata.console.result.PageResult.checkPage;
import static io.seata.server.storage.SessionConverter.convertToGlobalSessionVo;

/**
 * Global Session Redis ServiceImpl
 *
 * @author zhongxiang.wang
 * @author doubleDimple
 */
@Component
@org.springframework.context.annotation.Configuration
@ConditionalOnExpression("#{'redis'.equals('${sessionMode}')}")
public class GlobalSessionRedisServiceImpl implements GlobalSessionService {

	private static final Logger LOGGER = LoggerFactory.getLogger(GlobalSessionRedisServiceImpl.class);

	@Override
	public PageResult<GlobalSessionVO> query(GlobalSessionParam param) {
		List<GlobalSessionVO> result = new ArrayList<>();
		Long total = 0L;
		if (param.getTimeStart() != null || param.getTimeEnd() != null) {
			// not support time range query
			LOGGER.debug("not supported according to time range query");
			return PageResult.failure(ParameterRequired.getErrCode(), "not supported according to time range query");
		}
		List<GlobalSession> globalSessions = new ArrayList<>();

		RedisTransactionStoreManager instance = RedisTransactionStoreManager.getInstance();

		checkPage(param);

		if (isBlank(param.getXid()) && param.getStatus() == null) {
			total = instance.countByGlobalSessions(GlobalStatus.values());
			globalSessions = instance.findGlobalSessionByPage(param.getPageNum(), param.getPageSize(),
					param.isWithBranch());
		}
		else {
			List<GlobalSession> globalSessionsNew = new ArrayList<>();
			if (isNotBlank(param.getXid())) {
				SessionCondition sessionCondition = new SessionCondition();
				sessionCondition.setXid(param.getXid());
				sessionCondition.setLazyLoadBranch(!param.isWithBranch());
				globalSessions = instance.readSession(sessionCondition);
				total = (long) globalSessions.size();
			}

			if (param.getStatus() != null && GlobalStatus.get(param.getStatus()) != null) {
				if (CollectionUtils.isNotEmpty(globalSessions)) {
					globalSessionsNew = globalSessions.stream()
							.filter(globalSession -> globalSession.getStatus().getCode() == (param.getStatus()))
							.collect(Collectors.toList());
					total = (long) globalSessionsNew.size();
				}
				else {
					total = instance.countByGlobalSessions(new GlobalStatus[] { GlobalStatus.get(param.getStatus()) });
					globalSessionsNew = instance.readSessionStatusByPage(param);
				}
			}

			if (LOGGER.isDebugEnabled()) {
				if (isNotBlank(param.getApplicationId())) {
					// not support
					LOGGER.debug("not supported according to applicationId query");
				}
				if (isNotBlank(param.getTransactionName())) {
					// not support
					LOGGER.debug("not supported according to transactionName query");
				}
			}
			globalSessions = globalSessionsNew.size() > 0 ? globalSessionsNew : globalSessions;
		}

		convertToGlobalSessionVo(result, globalSessions);

		return PageResult.success(result, total.intValue(), param.getPageNum(), param.getPageSize());
	}

}
