/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.apache.syncope.core.logic.init;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.List;
  import javax.sql.DataSource;
  import org.apache.commons.io.IOUtils;
  import org.apache.syncope.common.lib.types.EntitlementsHolder;
  import org.apache.syncope.common.lib.types.FlowableEntitlement;
  import org.apache.syncope.core.flowable.impl.FlowableDeployUtils;
  import org.apache.syncope.core.flowable.impl.FlowableRuntimeUtils;
  import org.apache.syncope.core.flowable.support.DomainProcessEngine;
  import org.apache.syncope.core.persistence.api.SyncopeCoreLoader;
  import org.flowable.engine.ProcessEngine;
  import org.flowable.engine.impl.db.DbIdGenerator;
  import org.flowable.engine.repository.ProcessDefinition;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.core.io.Resource;
  
  public class FlowableLoader implements SyncopeCoreLoader {
  
      protected static final Logger LOG = LoggerFactory.getLogger(FlowableLoader.class);
  
      protected final Resource userWorkflowDef;
  
      protected final DomainProcessEngine dpEngine;
  
      public FlowableLoader(final Resource userWorkflowDef, final DomainProcessEngine dpEngine) {
          this.userWorkflowDef = userWorkflowDef;
          this.dpEngine = dpEngine;
      }
  
      @Override
      public int getOrder() {
          return 310;
      }
  
      @Override
      public void load() {
          EntitlementsHolder.getInstance().addAll(FlowableEntitlement.values());
      }
  
      @Override
      public void load(final String domain, final DataSource datasource) {
          byte[] wfDef = new byte[0];
  
          try (InputStream wfIn = userWorkflowDef.getInputStream()) {
              wfDef = IOUtils.toByteArray(wfIn);
          } catch (IOException e) {
              LOG.error("While loading " + userWorkflowDef.getFilename(), e);
          }
  
          ProcessEngine processEngine = dpEngine.getEngines().get(domain);
          if (processEngine == null) {
              LOG.error("Could not find the configured ProcessEngine for domain {}", domain);
          } else {
              List<ProcessDefinition> processes = processEngine.getRepositoryService().
                      createProcessDefinitionQuery().processDefinitionKey(FlowableRuntimeUtils.WF_PROCESS_ID).
                      list();
              LOG.debug(FlowableRuntimeUtils.WF_PROCESS_ID + " Flowable processes in repository: {}", processes);
  
              // Only loads process definition from file if not found in repository
              if (processes.isEmpty()) {
                  processEngine.getRepositoryService().createDeployment().addInputStream(
                          userWorkflowDef.getFilename(), new ByteArrayInputStream(wfDef)).deploy();
  
                  ProcessDefinition procDef = processEngine.getRepositoryService().createProcessDefinitionQuery().
                          processDefinitionKey(FlowableRuntimeUtils.WF_PROCESS_ID).latestVersion().
                          singleResult();
  
                  FlowableDeployUtils.deployModel(processEngine, procDef);
  
                  LOG.debug("Flowable Workflow definition loaded for domain {}", domain);
  
                  if (processEngine.getProcessEngineConfiguration().getIdGenerator() instanceof DbIdGenerator) {
                      // jump to the next ID block
                      for (int i = 0; i < processEngine.getProcessEngineConfiguration().getIdBlockSize(); i++) {
                          processEngine.getProcessEngineConfiguration().getIdGenerator().getNextId();
                      }
                 }
             }
         }
     }
 }