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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;

import org.activiti.bpmn.model.BpmnModel;
import org.activiti.engine.repository.DeploymentBuilder;
import org.activiti.engine.repository.DeploymentQuery;
import org.activiti.engine.repository.DiagramLayout;
import org.activiti.engine.repository.Model;
import org.activiti.engine.repository.ModelQuery;
import org.activiti.engine.repository.NativeDeploymentQuery;
import org.activiti.engine.repository.NativeModelQuery;
import org.activiti.engine.repository.NativeProcessDefinitionQuery;
import org.activiti.engine.repository.ProcessDefinition;
import org.activiti.engine.repository.ProcessDefinitionQuery;
import org.activiti.engine.task.IdentityLink;
import org.activiti.validation.ValidationError;

import java.io.InputStream;
import java.util.Date;
import java.util.List;

/** Service providing access to the repository of process definitions and deployments.
 * 
 * @author Tom Baeyens
 * @author Falko Menge
 * @author Tijs Rademakers
 * @author Joram Barrez
 * @author Henry Yan
 */
public interface RepositoryService {

  /** Starts creating a new deployment */
  DeploymentBuilder createDeployment();
  
  /** Deletes the given deployment.
   * @param deploymentId id of the deployment, cannot be null.
   * @throwns RuntimeException if there are still runtime or history process 
   * instances or jobs. 
   */
  void deleteDeployment(String deploymentId);
  
  /**
   * Deletes the given deployment and cascade deletion to process instances, 
   * history process instances and jobs.
   * @param deploymentId id of the deployment, cannot be null.
   * @deprecated use {@link #deleteDeployment(String, boolean)}.  This methods may be deleted from 5.3. 
   */
  void deleteDeploymentCascade(String deploymentId);

  /**
   * Deletes the given deployment and cascade deletion to process instances, 
   * history process instances and jobs.
   * @param deploymentId id of the deployment, cannot be null.
   */
  void deleteDeployment(String deploymentId, boolean cascade);
  
  /**
   * Sets the category of the deployment.
   * Deployments can be queried by category: see {@link DeploymentQuery#deploymentCategory(String)}.
   * 
   * @throws ActivitiObjectNotFoundException if no deployment with the provided id can be found.
   */
  void setDeploymentCategory(String deploymentId, String category);

  /**
   * Retrieves a list of deployment resources for the given deployment, 
   * ordered alphabetically.
   * @param deploymentId id of the deployment, cannot be null.
   */
  List getDeploymentResourceNames(String deploymentId);
  
  /**
   * Gives access to a deployment resource through a stream of bytes.
   * @param deploymentId id of the deployment, cannot be null.
   * @param resourceName name of the resource, cannot be null.
   * @throws ActivitiObjectNotFoundException when the resource doesn't exist in the given deployment or when no deployment exists
   * for the given deploymentId.
   */
  InputStream getResourceAsStream(String deploymentId, String resourceName);
  
  /**
   * 
   * EXPERIMENTAL FEATURE!
   * 
   * Changes the tenant identifier of a deployment to match the given tenant identifier.
   * This change will cascade to any related entity:
   * - process definitions related to the deployment
   * - process instances related to those process definitions
   * - executions related to those process instances
   * - tasks related to those process instances
   * - jobs related to the process definitions and process instances
   * 
   * This method can be used in the case that there was no tenant identifier set
   * on the deployment or those entities before.
   * 
   * This method can be used to remove a tenant identifier from the 
   * deployment and related entities (simply pass null).
   * 
   * Important: no optimistic locking will be done while executing the tenant identifier change!
   * 
   * This is an experimental feature, mainly because it WILL NOT work
   * properly in a clustered environment without special care:
   * suppose some process instance is in flight. The process definition is in the
   * process definition cache. When a task or job is created when continuing the process
   * instance, the process definition cache will be consulted to get the process definition
   * and from it the tenant identifier. Since it's cached, it will not be the new tenant identifier.
   * This method does clear the cache for this engineinstance , but it will not be cleared
   * on other nodes in a cluster (unless using a shared process definition cache). 
   * 
   * @param deploymentId The id of the deployment of which the tenant identifier will be changed.
   * @param newTenantId The new tenant identifier.
   */
  void changeDeploymentTenantId(String deploymentId, String newTenantId);

  /** Query process definitions. */
  ProcessDefinitionQuery createProcessDefinitionQuery();

  /**
   * Returns a new {@link org.activiti.engine.query.NativeQuery} for process definitions.
   */
  NativeProcessDefinitionQuery createNativeProcessDefinitionQuery();
  
  /** Query deployment. */
  DeploymentQuery createDeploymentQuery();

  /**
   * Returns a new {@link org.activiti.engine.query.NativeQuery} for deployment.
   */
  NativeDeploymentQuery createNativeDeploymentQuery();
  
  /**
   * Suspends the process definition with the given id. 
   * 
   * If a process definition is in state suspended, it will not be possible to start new process instances
   * based on the process definition.
   * 
   * Note: all the process instances of the process definition will still be active 
   * (ie. not suspended)!
   * 
   *  @throws ActivitiObjectNotFoundException if no such processDefinition can be found
   *  @throws ActivitiException if the process definition is already in state suspended.
   */
  void suspendProcessDefinitionById(String processDefinitionId);

  /**
   * Suspends the process definition with the given id. 
   * 
   * If a process definition is in state suspended, it will not be possible to start new process instances
   * based on the process definition.
   * 
   * @param suspendProcessInstances If true, all the process instances of the provided process definition
   *                                will be suspended too.
   * @param suspensionDate The date on which the process definition will be suspended. If null, the 
   *                       process definition is suspended immediately. 
   *                       Note: The job executor needs to be active to use this!                                
   * 
   * @throws ActivitiObjectNotFoundException if no such processDefinition can be found. 
   * @throws ActivitiException if the process definition is already in state suspended.
   */
  void suspendProcessDefinitionById(String processDefinitionId, boolean suspendProcessInstances, Date suspensionDate);
  
  /**
   * Suspends the all process definitions with the given key (= id in the bpmn20.xml file). 
   * 
   * If a process definition is in state suspended, it will not be possible to start new process instances
   * based on the process definition.
   * 
   * Note: all the process instances of the process definition will still be active 
   * (ie. not suspended)!
   * 
   *  @throws ActivitiObjectNotFoundException if no such processDefinition can be found
   *  @throws ActivitiException if the process definition is already in state suspended.
   */
  void suspendProcessDefinitionByKey(String processDefinitionKey);
  
  /**
   * Suspends the all process definitions with the given key (= id in the bpmn20.xml file). 
   * 
   * If a process definition is in state suspended, it will not be possible to start new process instances
   * based on the process definition.
   * 
   * @param suspendProcessInstances If true, all the process instances of the provided process definition
   *                                will be suspended too.
   * @param suspensionDate The date on which the process definition will be suspended. If null, the 
   *                       process definition is suspended immediately. 
   *                       Note: The job executor needs to be active to use this!   
   *  @throws ActivitiObjectNotFoundException if no such processDefinition can be found
   *  @throws ActivitiException if the process definition is already in state suspended.
   */
  void suspendProcessDefinitionByKey(String processDefinitionKey, boolean suspendProcessInstances, Date suspensionDate);
  
  /**
   * Similar to {@link #suspendProcessDefinitionByKey(String)}, but only applicable for the given tenant identifier.
   */
  void suspendProcessDefinitionByKey(String processDefinitionKey, String tenantId);
  
  /**
   * Similar to {@link #suspendProcessDefinitionByKey(String, boolean, Date)}, but only applicable for the given tenant identifier.
   */
  void suspendProcessDefinitionByKey(String processDefinitionKey, boolean suspendProcessInstances, Date suspensionDate, String tenantId);
  
  /**
   * Activates the process definition with the given id. 
   * 
   * @throws ActivitiObjectNotFoundException if no such processDefinition can be found or if the process definition is already in state active.
   */
  void activateProcessDefinitionById(String processDefinitionId);
  
  /**
   * Activates the process definition with the given id. 
   * 
   * @param activationDate The date on which the process definition will be activated. If null, the
   *                       process definition is suspended immediately. 
   *                       Note: The job executor needs to be active to use this!                                 
   *                                
   * @throws ActivitiObjectNotFoundException if no such processDefinition can be found.
   * @throws ActivitiException if the process definition is already in state active.
   */
  void activateProcessDefinitionById(String processDefinitionId, boolean activateProcessInstances, Date activationDate);
  
  /**
   * Activates the process definition with the given key (=id in the bpmn20.xml file). 
   * 
   * @throws ActivitiObjectNotFoundException if no such processDefinition can be found.
   * @throws ActivitiException if the process definition is already in state active.
   */
  void activateProcessDefinitionByKey(String processDefinitionKey);
  
  /**
   * Activates the process definition with the given key (=id in the bpmn20.xml file). 
   * 
   * @param activationDate The date on which the process definition will be activated. If null, the
   *                       process definition is suspended immediately. 
   *                       Note: The job executor needs to be active to use this!                                 
   *                                
   * @throws ActivitiObjectNotFoundException if no such processDefinition can be found.
   * @throws ActivitiException if the process definition is already in state active.
   */
  void activateProcessDefinitionByKey(String processDefinitionKey, boolean activateProcessInstances,  Date activationDate);
  
  /**
   * Similar to {@link #activateProcessDefinitionByKey(String)}, but only applicable for the given tenant identifier. 
   */
  void activateProcessDefinitionByKey(String processDefinitionKey, String tenantId);
  
  /**
   * Similar to {@link #activateProcessDefinitionByKey(String, boolean, Date)}, but only applicable for the given tenant identifier. 
   */
  void activateProcessDefinitionByKey(String processDefinitionKey, boolean activateProcessInstances,  Date activationDate, String tenantId);
  
  /**
   * Sets the category of the process definition.
   * Process definitions can be queried by category: see {@link ProcessDefinitionQuery#processDefinitionCategory(String)}.
   * 
   * @throws ActivitiObjectNotFoundException if no process defintion with the provided id can be found.
   */
  void setProcessDefinitionCategory(String processDefinitionId, String category);

  /**
   * Gives access to a deployed process model, e.g., a BPMN 2.0 XML file,
   * through a stream of bytes.
   *
   * @param processDefinitionId
   *          id of a {@link ProcessDefinition}, cannot be null.
   * @throws ActivitiObjectNotFoundException
   *           when the process model doesn't exist.
   */
  InputStream getProcessModel(String processDefinitionId);

  /**
   * Gives access to a deployed process diagram, e.g., a PNG image, through a
   * stream of bytes.
   *
   * @param processDefinitionId
   *          id of a {@link ProcessDefinition}, cannot be null.
   * @return null when the diagram resource name of a {@link ProcessDefinition} is null.
   * @throws ActivitiObjectNotFoundException
   *           when the process diagram doesn't exist.
   */
  InputStream getProcessDiagram(String processDefinitionId);
  
  /**
   * Returns the {@link ProcessDefinition} including all BPMN information like additional 
   * Properties (e.g. documentation).
   */
  ProcessDefinition getProcessDefinition(String processDefinitionId);  
  
  /**
   * Returns the {@link BpmnModel} corresponding with the process definition with
   * the provided process definition id. The {@link BpmnModel} is a pojo versions
   * of the BPMN 2.0 xml and can be used to introspect the process definition
   * using regular Java.
   */
  BpmnModel getBpmnModel(String processDefinitionId);

  /**
   * Provides positions and dimensions of elements in a process diagram as
   * provided by {@link RepositoryService#getProcessDiagram(String)}.
   *
   * This method requires a process model and a diagram image to be deployed.
   * @param processDefinitionId id of a {@link ProcessDefinition}, cannot be null.
   * @return Map with process element ids as keys and positions and dimensions as values.
   * @return null when the input stream of a process diagram is null.
   * @throws ActivitiObjectNotFoundException when the process model or diagram doesn't exist.
   */
  DiagramLayout getProcessDiagramLayout(String processDefinitionId);
  
  /**
   * Creates a new model. The model is transient and must be saved using 
   * {@link #saveModel(Model)}.
   */
  public Model newModel();

  /**
   * Saves the model. If the model already existed, the model is updated
   * otherwise a new model is created.
   * @param model model to save, cannot be null.
   */
  public void saveModel(Model model);

  /**
   * @param modelId id of model to delete, cannot be null. When an id is passed
   * for an unexisting model, this operation is ignored.
   */
  public void deleteModel(String modelId);
  
  /**
   * Saves the model editor source for a model
   * @param modelId id of model to delete, cannot be null. When an id is passed
   * for an unexisting model, this operation is ignored.
   */
  public void addModelEditorSource(String modelId, byte[] bytes);
  
  /**
   * Saves the model editor source extra for a model
   * @param modelId id of model to delete, cannot be null. When an id is passed
   * for an unexisting model, this operation is ignored.
   */
  public void addModelEditorSourceExtra(String modelId, byte[] bytes);
  
  /** Query models. */
  public ModelQuery createModelQuery();

  /**
   * Returns a new {@link org.activiti.engine.query.NativeQuery} for process definitions.
   */
  NativeModelQuery createNativeModelQuery();
  
  /**
   * Returns the {@link Model}
   * @param modelId id of model
   */
  public Model getModel(String modelId);
  
  /**
   * Returns the model editor source as a byte array
   * @param modelId id of model
   */
  public byte[] getModelEditorSource(String modelId);
  
  /**
   * Returns the model editor source extra as a byte array
   * @param modelId id of model
   */
  public byte[] getModelEditorSourceExtra(String modelId);
  
  /**
   * Authorizes a candidate user for a process definition.
   * @param processDefinitionId id of the process definition, cannot be null.
   * @param userId id of the user involve, cannot be null.
   * @throws ActivitiObjectNotFoundException when the process definition or user doesn't exist.
   */
  void addCandidateStarterUser(String processDefinitionId, String userId);
  
  /**
   * Authorizes a candidate group for a process definition.
   * @param processDefinitionId id of the process definition, cannot be null.
   * @param groupId id of the group involve, cannot be null.
   * @throws ActivitiObjectNotFoundException when the process definition or group doesn't exist.
   */
  void addCandidateStarterGroup(String processDefinitionId, String groupId);
  
  /**
   * Removes the authorization of a candidate user for a process definition.
   * @param processDefinitionId id of the process definition, cannot be null.
   * @param userId id of the user involve, cannot be null.
   * @throws ActivitiObjectNotFoundException when the process definition or user doesn't exist.
   */
  void deleteCandidateStarterUser(String processDefinitionId, String userId);
  
  /**
   * Removes the authorization of a candidate group for a process definition.
   * @param processDefinitionId id of the process definition, cannot be null.
   * @param groupId id of the group involve, cannot be null.
   * @throws ActivitiObjectNotFoundException when the process definition or group doesn't exist.
   */
  void deleteCandidateStarterGroup(String processDefinitionId, String groupId);

  /**
   * Retrieves the {@link IdentityLink}s associated with the given process definition.
   * Such an {@link IdentityLink} informs how a certain identity (eg. group or user)
   * is authorized for a certain process definition
   */
  List getIdentityLinksForProcessDefinition(String processDefinitionId);
  
  /**
   * Validates the given process definition against the rules for executing a process definition
   * on the Activiti engine.
   * 
   * To create such a {@link BpmnModel} from a String, following code may be used:
   * 
   * XMLInputFactory xif = XMLInputFactory.newInstance();
   * InputStreamReader in = new InputStreamReader(new ByteArrayInputStream(myProcess.getBytes()), "UTF-8"); // Change to other streams for eg from classpath
   * XMLStreamReader xtr = xif.createXMLStreamReader(in);
   * bpmnModel = new BpmnXMLConverter().convertToBpmnModel(xtr);
   * 
   */
  List validateProcess(BpmnModel bpmnModel);

}