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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.cmd;

import java.util.Map;

import org.activiti.engine.ActivitiException;
import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.ActivitiObjectNotFoundException;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.deploy.DeploymentManager;
import org.activiti.engine.impl.persistence.entity.MessageEventSubscriptionEntity;
import org.activiti.engine.impl.runtime.ProcessInstanceBuilderImpl;
import org.activiti.engine.impl.util.ProcessInstanceHelper;
import org.activiti.engine.repository.ProcessDefinition;
import org.activiti.engine.runtime.ProcessInstance;

/**


 */
public class StartProcessInstanceByMessageCmd implements Command {

  protected String messageName;
  protected String businessKey;
  protected Map processVariables;
  protected Map transientVariables;
  protected String tenantId;

  public StartProcessInstanceByMessageCmd(String messageName, String businessKey, Map processVariables, String tenantId) {
    this.messageName = messageName;
    this.businessKey = businessKey;
    this.processVariables = processVariables;
    this.tenantId = tenantId;
  }
  
  public StartProcessInstanceByMessageCmd(ProcessInstanceBuilderImpl processInstanceBuilder) {
    this.messageName = processInstanceBuilder.getMessageName();
    this.businessKey = processInstanceBuilder.getBusinessKey();
    this.processVariables = processInstanceBuilder.getVariables();
    this.transientVariables = processInstanceBuilder.getTransientVariables();
    this.tenantId = processInstanceBuilder.getTenantId();
  }

  public ProcessInstance execute(CommandContext commandContext) {

    if (messageName == null) {
      throw new ActivitiIllegalArgumentException("Cannot start process instance by message: message name is null");
    }

    MessageEventSubscriptionEntity messageEventSubscription = commandContext.getEventSubscriptionEntityManager().findMessageStartEventSubscriptionByName(messageName, tenantId);

    if (messageEventSubscription == null) {
      throw new ActivitiObjectNotFoundException("Cannot start process instance by message: no subscription to message with name '" + messageName + "' found.", MessageEventSubscriptionEntity.class);
    }

    String processDefinitionId = messageEventSubscription.getConfiguration();
    if (processDefinitionId == null) {
      throw new ActivitiException("Cannot start process instance by message: subscription to message with name '" + messageName + "' is not a message start event.");
    }

    DeploymentManager deploymentCache = commandContext.getProcessEngineConfiguration().getDeploymentManager();

    ProcessDefinition processDefinition = deploymentCache.findDeployedProcessDefinitionById(processDefinitionId);
    if (processDefinition == null) {
      throw new ActivitiObjectNotFoundException("No process definition found for id '" + processDefinitionId + "'", ProcessDefinition.class);
    }

    ProcessInstanceHelper processInstanceHelper = commandContext.getProcessEngineConfiguration().getProcessInstanceHelper();
    ProcessInstance processInstance = processInstanceHelper.createAndStartProcessInstanceByMessage(processDefinition, businessKey, messageName, processVariables, transientVariables, messageEventSubscription);

    return processInstance;
  }

}