/*
 * Copyright 2017 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * 
 *      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.jbpm.executor.commands.error;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import javax.persistence.EntityManager;

import org.jbpm.runtime.manager.impl.jpa.ExecutionErrorInfo;
import org.kie.api.runtime.process.ProcessInstance;

/**
 * Command that will auto acknowledge process instance errors 
 * based on the last initial node instance when the error happened.
 * 
 * Following parameters are supported by this command:
 * <ul>
 *  <li>EmfName - name of entity manager factory to be used for queries (valid persistence unit name)</li>
 *  <li>SingleRun - indicates if execution should be single run only (true|false)</li>
 *  <li>NextRun - provides next execution time (valid time expression e.g. 1d, 5h, etc)</li>
 * </ul>
 */
public class ProcessAutoAckErrorCommand extends AutoAckErrorCommand {

    private static final String RULE = "Process instances that previously failed but now are in different nodes - meaning node where they were was already completed - or completed/aborted";
    
    @SuppressWarnings("unchecked")
    @Override
    protected List<ExecutionErrorInfo> findErrorsToAck(EntityManager em) {
        List<ExecutionErrorInfo> errorsToAck = new ArrayList<>();
        
        String findProcessErrorsQuery = "select error from ExecutionErrorInfo error "
                + "where error.acknowledged =:acknowledged "
                + "and error.processInstanceId in (select pil.id from ProcessInstanceLog pil where status in (:status))";
        
        List<ExecutionErrorInfo> processErrorsToAck = em.createQuery(findProcessErrorsQuery)
                .setParameter("acknowledged", new Short("0"))
                .setParameter("status", Arrays.asList(ProcessInstance.STATE_COMPLETED, ProcessInstance.STATE_ABORTED))
                .getResultList();
        errorsToAck.addAll(processErrorsToAck);
        
        String findNodeErrorsQuery = "select error from ExecutionErrorInfo error "
                + "where error.acknowledged =:acknowledged "
                + "and error.initActivityId in (select nil.nodeInstanceId from NodeInstanceLog nil where nil.processInstanceId = error.processInstanceId and nil.nodeInstanceId = error.initActivityId and nil.type = 1)";
        
        List<ExecutionErrorInfo> nodeErrorsToAck = em.createQuery(findNodeErrorsQuery)
                .setParameter("acknowledged", new Short("0"))
                .getResultList();
        errorsToAck.addAll(nodeErrorsToAck);
        
        return errorsToAck;
        
    }

    @Override
    protected String getAckRule() {
        return RULE;
    }

}
