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/* 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 org.flowable.engine.impl.repository;

import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;

import org.apache.commons.lang3.StringUtils;
import org.flowable.common.engine.impl.interceptor.CommandContext;
import org.flowable.engine.impl.DeploymentQueryImpl;
import org.flowable.engine.impl.ProcessDefinitionQueryImpl;
import org.flowable.engine.impl.persistence.entity.ProcessDefinitionEntityManager;
import org.flowable.engine.impl.util.CommandContextUtil;
import org.flowable.engine.repository.DeploymentMergeStrategy;
import org.flowable.engine.repository.ProcessDefinition;

/**
 * @author Valentin Zickner
 */
public class MergeByDateDeploymentMergeStrategy implements DeploymentMergeStrategy {

    @Override
    public void prepareMerge(CommandContext commandContext, String deploymentId, String newTenantId) {
        List processDefinitions = new ProcessDefinitionQueryImpl().deploymentId(deploymentId).list();
        ProcessDefinitionEntityManager processDefinitionEntityManager = CommandContextUtil.getProcessDefinitionEntityManager(commandContext);
        for (ProcessDefinition processDefinition : processDefinitions) {
            processDefinitionEntityManager.updateProcessDefinitionVersionForProcessDefinitionId(processDefinition.getId(), 0);
        }
    }

    @Override
    public void finalizeMerge(CommandContext commandContext, String deploymentId, String newTenantId) {
        List processDefinitions = new ProcessDefinitionQueryImpl().deploymentId(deploymentId).list();
        ProcessDefinitionEntityManager processDefinitionEntityManager = CommandContextUtil.getProcessDefinitionEntityManager(commandContext);
        for (ProcessDefinition processDefinition : processDefinitions) {
            ProcessDefinitionQueryImpl processDefinitionQuery = new ProcessDefinitionQueryImpl();
            if (StringUtils.isEmpty(newTenantId)) {
                processDefinitionQuery.processDefinitionWithoutTenantId();
            } else {
                processDefinitionQuery.processDefinitionTenantId(newTenantId);
            }
            
            List allProcessDefinitionsWithKey = processDefinitionQuery
                    .processDefinitionKey(processDefinition.getKey())
                    .list();
            
            List orderedProcessDefinitions = sortProcessDefinitionsByDeploymentTime(allProcessDefinitionsWithKey);

            int versionNumber = allProcessDefinitionsWithKey.size();
            for (ProcessDefinition alreadyExistingProcessDefinition : orderedProcessDefinitions) {
                processDefinitionEntityManager.updateProcessDefinitionVersionForProcessDefinitionId(alreadyExistingProcessDefinition.getId(), versionNumber--);
            }
        }
    }

    protected List sortProcessDefinitionsByDeploymentTime(List allProcessDefinitionsWithKey) {
        List deploymentIds = extractDeploymentIds(allProcessDefinitionsWithKey);
        Map processDefinitionLookupTable = allProcessDefinitionsWithKey
                .stream()
                .collect(Collectors.toMap(ProcessDefinition::getDeploymentId, Function.identity()));

        return new DeploymentQueryImpl()
                .deploymentIds(deploymentIds)
                .orderByDeploymentTime()
                .desc()
                .list()
                .stream()
                .map(deployment -> processDefinitionLookupTable.get(deployment.getId()))
                .collect(Collectors.toList());
    }

    protected List extractDeploymentIds(List allProcessDefinitionsWithKey) {
        return allProcessDefinitionsWithKey
                .stream()
                .map(ProcessDefinition::getDeploymentId)
                .collect(Collectors.toList());
    }

}