content: /*
   * Copyright 2010-2025 Hyland Software, Inc. and its affiliates.
   *
   * 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.runtime.api.model.impl;
  
  import static java.util.Collections.emptyList;
  
  import java.util.List;
  import java.util.Objects;
  import java.util.function.Function;
  import java.util.stream.Collectors;
  import org.activiti.api.task.model.Task;
  import org.activiti.api.task.model.impl.TaskImpl;
  import org.activiti.engine.TaskService;
  import org.activiti.engine.impl.persistence.entity.TaskEntity;
  import org.activiti.engine.task.IdentityLink;
  import org.activiti.engine.task.IdentityLinkType;
  import org.springframework.beans.factory.annotation.Autowired;
  
  public class APITaskConverter
      extends ListConverter<org.activiti.engine.task.Task, Task>
      implements ModelConverter<org.activiti.engine.task.Task, Task> {
  
      private final TaskService taskService;
  
      @Autowired
      public APITaskConverter(TaskService taskService) {
          this.taskService = taskService;
      }
  
      @Override
      public Task from(org.activiti.engine.task.Task internalTask) {
          return from(internalTask, calculateStatus(internalTask));
      }
  
      public Task fromWithCandidates(org.activiti.engine.task.Task internalTask) {
          TaskImpl task = buildFromInternalTask(internalTask, calculateStatus(internalTask));
          extractCandidateUsersAndGroups(internalTask, task);
          return task;
      }
  
      private TaskImpl buildFromInternalTask(org.activiti.engine.task.Task internalTask, Task.TaskStatus status) {
          TaskImpl task = new TaskImpl(internalTask.getId(), internalTask.getName(), status);
          task.setProcessDefinitionId(internalTask.getProcessDefinitionId());
          task.setTaskProcessRootProcessInstanceId(internalTask.getTaskProcessRootProcessInstanceId());
          task.setProcessInstanceId(internalTask.getProcessInstanceId());
          task.setAssignee(internalTask.getAssignee());
          task.setClaimedDate(internalTask.getClaimTime());
          task.setCreatedDate(internalTask.getCreateTime());
          task.setDueDate(internalTask.getDueDate());
          task.setDescription(internalTask.getDescription());
          task.setOwner(internalTask.getOwner());
          task.setParentTaskId(internalTask.getParentTaskId());
          task.setPriority(internalTask.getPriority());
          task.setFormKey(internalTask.getFormKey());
          task.setTaskDefinitionKey(internalTask.getTaskDefinitionKey());
          task.setAppVersion(Objects.toString(internalTask.getAppVersion(), null));
          task.setBusinessKey(internalTask.getBusinessKey());
  
          return task;
      }
  
      public Task from(org.activiti.engine.task.Task internalTask, Task.TaskStatus status) {
          return buildFromInternalTask(internalTask, status);
      }
  
      public Task fromWithCompletedBy(
          org.activiti.engine.task.Task internalTask,
          Task.TaskStatus status,
          String completedBy
      ) {
          TaskImpl task = buildFromInternalTask(internalTask, status);
          task.setCompletedBy(completedBy);
  
          return task;
      }
  
      private void extractCandidateUsersAndGroups(org.activiti.engine.task.Task source, TaskImpl destination) {
          List<IdentityLink> candidates = taskService.getIdentityLinksForTask(source.getId());
          destination.setCandidateGroups(extractCandidatesBy(candidates, IdentityLink::getGroupId));
          destination.setCandidateUsers(extractCandidatesBy(candidates, IdentityLink::getUserId));
      }
  
      private List<String> extractCandidatesBy(List<IdentityLink> candidates, Function<IdentityLink, String> extractor) {
          List<String> result = emptyList();
          if (candidates != null) {
              result = candidates
                  .stream()
                  .filter(candidate -> IdentityLinkType.CANDIDATE.equals(candidate.getType()))
                  .map(extractor::apply)
                  .filter(Objects::nonNull)
                  .collect(Collectors.toList());
          }
          return result;
      }
  
      private Task.TaskStatus calculateStatus(org.activiti.engine.task.Task source) {
          if (source instanceof TaskEntity && (((TaskEntity) source).isDeleted() || ((TaskEntity) source).isCanceled())) {
              return Task.TaskStatus.CANCELLED;
          } else if (source.isSuspended()) {
              return Task.TaskStatus.SUSPENDED;
          } else if (source.getAssignee() != null && !source.getAssignee().isEmpty()) {
              return Task.TaskStatus.ASSIGNED;
          }
          return Task.TaskStatus.CREATED;
      }
  }
  