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/* Licensed under the Apache License, Version 2.0 (the "License");
/* 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 org.activiti.bpmn.model.ValuedDataObject;
import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.ActivitiObjectNotFoundException;
import org.activiti.engine.ProcessEngineConfiguration;
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.runtime.ProcessInstanceBuilderImpl;
import org.activiti.engine.impl.util.ProcessInstanceHelper;
import org.activiti.engine.repository.ProcessDefinition;
import org.activiti.engine.runtime.ProcessInstance;

import java.io.Serializable;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;

/**


 */
public class StartProcessInstanceCmd implements Command, Serializable {

  private static final long serialVersionUID = 1L;
  protected String processDefinitionKey;
  protected String processDefinitionId;
  protected Map variables;
  protected Map transientVariables;
  protected String businessKey;
  protected String tenantId;
  protected String processInstanceName;
  protected ProcessInstanceHelper processInstanceHelper;

  public StartProcessInstanceCmd(String processDefinitionKey, String processDefinitionId, String businessKey, Map variables) {
    this.processDefinitionKey = processDefinitionKey;
    this.processDefinitionId = processDefinitionId;
    this.businessKey = businessKey;
    this.variables = variables;
  }

  public StartProcessInstanceCmd(String processDefinitionKey, String processDefinitionId, String businessKey, Map variables, String tenantId) {
    this(processDefinitionKey, processDefinitionId, businessKey, variables);
    this.tenantId = tenantId;
  }

  public StartProcessInstanceCmd(ProcessInstanceBuilderImpl processInstanceBuilder) {
    this(processInstanceBuilder.getProcessDefinitionKey(), 
        processInstanceBuilder.getProcessDefinitionId(), 
        processInstanceBuilder.getBusinessKey(), 
        processInstanceBuilder.getVariables(), 
        processInstanceBuilder.getTenantId());
    this.processInstanceName = processInstanceBuilder.getProcessInstanceName();
    this.transientVariables = processInstanceBuilder.getTransientVariables();
  }

  public ProcessInstance execute(CommandContext commandContext) {
    DeploymentManager deploymentCache = commandContext.getProcessEngineConfiguration().getDeploymentManager();

    // Find the process definition
    ProcessDefinition processDefinition = null;
    if (processDefinitionId != null) {

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

    } else if (processDefinitionKey != null && (tenantId == null || ProcessEngineConfiguration.NO_TENANT_ID.equals(tenantId))) {

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

    } else if (processDefinitionKey != null && tenantId != null && !ProcessEngineConfiguration.NO_TENANT_ID.equals(tenantId)) {

      processDefinition = deploymentCache.findDeployedLatestProcessDefinitionByKeyAndTenantId(processDefinitionKey, tenantId);
      if (processDefinition == null) {
        throw new ActivitiObjectNotFoundException("No process definition found for key '" + processDefinitionKey + "' for tenant identifier " + tenantId, ProcessDefinition.class);
      }

    } else {
      throw new ActivitiIllegalArgumentException("processDefinitionKey and processDefinitionId are null");
    }

    processInstanceHelper = commandContext.getProcessEngineConfiguration().getProcessInstanceHelper();
    ProcessInstance processInstance = createAndStartProcessInstance(processDefinition, businessKey, processInstanceName, variables, transientVariables);

    return processInstance;
  }

  protected ProcessInstance createAndStartProcessInstance(ProcessDefinition processDefinition, String businessKey, String processInstanceName, 
      Map variables, Map transientVariables) {
    return processInstanceHelper.createAndStartProcessInstance(processDefinition, businessKey, processInstanceName, variables, transientVariables);
  }
  
  protected Map processDataObjects(Collection dataObjects) {
    Map variablesMap = new HashMap();
    // convert data objects to process variables
    if (dataObjects != null) {
      for (ValuedDataObject dataObject : dataObjects) {
        variablesMap.put(dataObject.getName(), dataObject.getValue());
      }
    }
    return variablesMap;
  }
}