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/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; 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.camunda.bpm.engine.impl.jobexecutor;

import org.camunda.bpm.engine.ProcessEngineException;
import org.camunda.bpm.engine.impl.DefaultPriorityProvider;
import org.camunda.bpm.engine.impl.ProcessEngineLogger;
import org.camunda.bpm.engine.impl.bpmn.parser.BpmnParse;
import org.camunda.bpm.engine.impl.context.Context;
import org.camunda.bpm.engine.impl.core.variable.mapping.value.ParameterValueProvider;
import org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity;
import org.camunda.bpm.engine.impl.persistence.entity.JobDefinitionEntity;
import org.camunda.bpm.engine.impl.pvm.process.ProcessDefinitionImpl;

/**
 * @author Thorben Lindhauer
 * @author Christopher Zell
 */
public class DefaultJobPriorityProvider extends DefaultPriorityProvider> {

  private final static JobExecutorLogger LOG = ProcessEngineLogger.JOB_EXECUTOR_LOGGER;

  @Override
  protected Long getSpecificPriority(ExecutionEntity execution, JobDeclaration param, String jobDefinitionId) {
    Long specificPriority = null;
    JobDefinitionEntity jobDefinition = getJobDefinitionFor(jobDefinitionId);
    if (jobDefinition != null) 
      specificPriority = jobDefinition.getOverridingJobPriority();
    
    if (specificPriority == null) {
      ParameterValueProvider priorityProvider = param.getJobPriorityProvider();
      if (priorityProvider != null) {
        specificPriority = evaluateValueProvider(priorityProvider, execution, describeContext(param, execution));
      }
    }
    return specificPriority;
  }

  @Override
  protected Long getProcessDefinitionPriority(ExecutionEntity execution, JobDeclaration jobDeclaration) {
    ProcessDefinitionImpl processDefinition = jobDeclaration.getProcessDefinition();
    return getProcessDefinedPriority(processDefinition, BpmnParse.PROPERTYNAME_JOB_PRIORITY, execution, describeContext(jobDeclaration, execution));
  }

  protected JobDefinitionEntity getJobDefinitionFor(String jobDefinitionId) {
    if (jobDefinitionId != null) {
      return Context.getCommandContext()
        .getJobDefinitionManager()
        .findById(jobDefinitionId);
    } else {
      return null;
    }
  }

  protected Long getActivityPriority(ExecutionEntity execution, JobDeclaration jobDeclaration) {
    if (jobDeclaration != null) {
      ParameterValueProvider priorityProvider = jobDeclaration.getJobPriorityProvider();
      if (priorityProvider != null) {
        return evaluateValueProvider(priorityProvider, execution, describeContext(jobDeclaration, execution));
      }
    }
    return null;
  }

  @Override
  protected void logNotDeterminingPriority(ExecutionEntity execution, Object value, ProcessEngineException e) {
    LOG.couldNotDeterminePriority(execution, value, e);
  }

  protected String describeContext(JobDeclaration jobDeclaration, ExecutionEntity executionEntity) {
    return "Job " + jobDeclaration.getActivityId()
      + "/" + jobDeclaration.getJobHandlerType() + " instantiated "
      + "in context of " + executionEntity;
  }
}