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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.io.Serializable;

import org.activiti.bpmn.model.BpmnModel;
import org.activiti.bpmn.model.SubProcess;
import org.activiti.bpmn.model.ValuedDataObject;
import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.ActivitiObjectNotFoundException;
import org.activiti.engine.DynamicBpmnConstants;
import org.activiti.engine.impl.DataObjectImpl;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
import org.activiti.engine.impl.persistence.entity.VariableInstance;
import org.activiti.engine.impl.util.ProcessDefinitionUtil;
import org.activiti.engine.runtime.DataObject;
import org.activiti.engine.runtime.Execution;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ObjectNode;

public class GetDataObjectCmd implements Command, Serializable {

  private static final long serialVersionUID = 1L;
  protected String executionId;
  protected String dataObjectName;
  protected boolean isLocal;
  protected String locale;
  protected boolean withLocalizationFallback;
  
  public GetDataObjectCmd(String executionId, String dataObjectName, boolean isLocal) {
    this.executionId = executionId;
    this.dataObjectName = dataObjectName;
    this.isLocal = isLocal;
  }
  
  public GetDataObjectCmd(String executionId, String dataObjectName, boolean isLocal, String locale, boolean withLocalizationFallback) {
    this.executionId = executionId;
    this.dataObjectName = dataObjectName;
    this.isLocal = isLocal;
    this.locale = locale;
    this.withLocalizationFallback = withLocalizationFallback;
  }

  public DataObject execute(CommandContext commandContext) {
    if (executionId == null) {
      throw new ActivitiIllegalArgumentException("executionId is null");
    }
    if (dataObjectName == null) {
      throw new ActivitiIllegalArgumentException("dataObjectName is null");
    }
    
    ExecutionEntity execution = commandContext.getExecutionEntityManager().findById(executionId);

    if (execution == null) {
      throw new ActivitiObjectNotFoundException("execution " + executionId + " doesn't exist", Execution.class);
    }
    
    DataObject dataObject = null;
    
    VariableInstance variableEntity = null;
    if (isLocal) {
      variableEntity = execution.getVariableInstanceLocal(dataObjectName, false);
    } else {
      variableEntity = execution.getVariableInstance(dataObjectName, false);
    }

    String localizedName = null;
    String localizedDescription = null;
    
    if (variableEntity != null) {
      ExecutionEntity executionEntity = commandContext.getExecutionEntityManager().findById(variableEntity.getExecutionId());
      while (!executionEntity.isScope()) {
        executionEntity = executionEntity.getParent();
      }
      
      BpmnModel bpmnModel = ProcessDefinitionUtil.getBpmnModel(executionEntity.getProcessDefinitionId());
      ValuedDataObject foundDataObject = null;
      if (executionEntity.getParentId() == null) {
        for (ValuedDataObject dataObjectDefinition : bpmnModel.getMainProcess().getDataObjects()) {
          if (dataObjectDefinition.getName().equals(variableEntity.getName())) {
            foundDataObject = dataObjectDefinition;
            break;
          }
        }
        
      } else {
        SubProcess subProcess = (SubProcess) bpmnModel.getFlowElement(execution.getActivityId());
        for (ValuedDataObject dataObjectDefinition : subProcess.getDataObjects()) {
          if (dataObjectDefinition.getName().equals(variableEntity.getName())) {
            foundDataObject = dataObjectDefinition;
            break;
          }
        }
      }
      
      if (locale != null && foundDataObject != null) {
        ObjectNode languageNode = Context.getLocalizationElementProperties(locale, foundDataObject.getId(), 
            execution.getProcessDefinitionId(), withLocalizationFallback);
        
        if (variableEntity != null && languageNode != null) {
          JsonNode nameNode = languageNode.get(DynamicBpmnConstants.LOCALIZATION_NAME);
          if (nameNode != null) {
            localizedName = nameNode.asText();
          }
          JsonNode descriptionNode = languageNode.get(DynamicBpmnConstants.LOCALIZATION_DESCRIPTION);
          if (descriptionNode != null) {
            localizedDescription = descriptionNode.asText();
          }
        }
      }
      
      if (foundDataObject != null) {
        dataObject = new DataObjectImpl(variableEntity.getName(), variableEntity.getValue(), foundDataObject.getDocumentation(), 
            foundDataObject.getType(), localizedName, localizedDescription, foundDataObject.getId());
      }
    }
    
    return dataObject;
  }
}