package fr.tiogars.chat.domains.task.services;
   
   import java.util.Optional;
   
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.stereotype.Service;
   import org.springframework.transaction.annotation.Transactional;
   
   import fr.tiogars.chat.domains.task.entities.TaskEntity;
  import fr.tiogars.chat.domains.task.models.Task;
  import fr.tiogars.chat.domains.task.models.UpdateTaskRequest;
  import fr.tiogars.chat.domains.task.repositories.TaskRepository;
  
  /** Updates existing Tasks. */
  @Service
  public class TaskUpdateService {
  
      private final TaskRepository repository;
  
      @Autowired
      private TaskReferences references;
  
      @Autowired
      public TaskUpdateService(TaskRepository repository) {
          this.repository = repository;
      }
  
      /**
       * Updates the mutable fields of a Task.
       *
       * @param id      persistent identifier
       * @param request replacement business data
       * @return updated template, or an empty optional when it does not exist
       */
      @Transactional
      public Optional<Task> update(Long id, UpdateTaskRequest request) {
          return repository.findById(id)
                  .map(existing -> {
                      existing.update(request.label(), request.description());
                      existing.attributes(request.status(), request.priority(), request.dueDate(), request.assignedTo());
                      if (references != null) {
                          references.apply(existing, request.tagIds(), request.nomenclatureId());
                      }
                      return toRecord(repository.saveAndFlush(existing));
                  });
      }
  
      private static Task toRecord(TaskEntity entity) {
          return new Task(
                  entity.getId(),
                  entity.getCode(),
                  entity.getLabel(),
                  entity.getDescription(),
                  entity.getCreatedDate(),
                  entity.getLastModifiedDate(),
                  entity.getCreatedBy(),
                  entity.getLastModifiedBy(),
                  entity.getStatus(), entity.getPriority(), entity.getDueDate(), entity.getAssignedTo(),
                  entity.getTagIds(), entity.getNomenclatureId());
      }
  }