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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.activiti.engine.impl.jobexecutor;

import org.activiti.bpmn.model.FlowElement;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.delegate.event.ActivitiEventType;
import org.activiti.engine.delegate.event.impl.ActivitiEventBuilder;
import org.activiti.engine.impl.cmd.StartProcessInstanceCmd;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
import org.activiti.engine.impl.persistence.entity.JobEntity;
import org.activiti.engine.impl.persistence.entity.ProcessDefinitionEntity;
import org.activiti.engine.impl.util.ProcessDefinitionUtil;
import org.activiti.engine.impl.util.ProcessInstanceHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class TimerStartEventJobHandler extends TimerEventHandler implements JobHandler {

  private static Logger log = LoggerFactory.getLogger(TimerStartEventJobHandler.class);

  public static final String TYPE = "timer-start-event";

  public String getType() {
    return TYPE;
  }

  public void execute(JobEntity job, String configuration, ExecutionEntity execution, CommandContext commandContext) {
    
    ProcessDefinitionEntity processDefinitionEntity = ProcessDefinitionUtil
        .getProcessDefinitionFromDatabase(job.getProcessDefinitionId()); // From DB -> need to get latest suspended state
    if (processDefinitionEntity == null) {
      throw new ActivitiException("Could not find process definition needed for timer start event");
    }

    try {
      if (!processDefinitionEntity.isSuspended()) {
        
        if (commandContext.getEventDispatcher().isEnabled()) {
          commandContext.getEventDispatcher().dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.TIMER_FIRED, job));
        }
        
        // Find initial flow element matching the signal start event
        org.activiti.bpmn.model.Process process = ProcessDefinitionUtil.getProcess(job.getProcessDefinitionId());
        String activityId = TimerEventHandler.getActivityIdFromConfiguration(configuration);
        if (activityId != null) {
          FlowElement flowElement = process.getFlowElement(activityId, true);
          if (flowElement == null) {
            throw new ActivitiException("Could not find matching FlowElement for activityId " + activityId);
          }
          ProcessInstanceHelper processInstanceHelper = commandContext.getProcessEngineConfiguration().getProcessInstanceHelper();
          processInstanceHelper.createAndStartProcessInstanceWithInitialFlowElement(processDefinitionEntity, null, null, flowElement, process, null, null, true);
        } else {
          new StartProcessInstanceCmd(processDefinitionEntity.getKey(), null, null, null, job.getTenantId()).execute(commandContext);
        }
        
      } else {
        log.debug("ignoring timer of suspended process definition {}", processDefinitionEntity.getName());
      }
    } catch (RuntimeException e) {
      log.error("exception during timer execution", e);
      throw e;
    } catch (Exception e) {
      log.error("exception during timer execution", e);
      throw new ActivitiException("exception during timer execution: " + e.getMessage(), e);
    }
  }
}