package com.guinetik.hexafun.examples.tasks;
   
   import java.util.UUID;
   
   /**
    * Immutable Task domain model with Kanban workflow status.
    */
   public record Task(
       String id,
      String title,
      String description,
      TaskStatus status
  ) {
      /**
       * Create a new task with generated ID in TODO status.
       */
      public static Task create(String title, String description) {
          return new Task(UUID.randomUUID().toString(), title, description, TaskStatus.TODO);
      }
  
      /**
       * Check if this task is completed.
       */
      public boolean completed() {
          return status == TaskStatus.DONE;
      }
  
      /**
       * Start working on this task (move to DOING).
       */
      public Task start() {
          return new Task(id, title, description, TaskStatus.DOING);
      }
  
      /**
       * Mark this task as completed (move to DONE).
       */
      public Task complete() {
          return new Task(id, title, description, TaskStatus.DONE);
      }
  
      /**
       * Move task back to TODO.
       */
      public Task reopen() {
          return new Task(id, title, description, TaskStatus.TODO);
      }
  
      /**
       * Update the title.
       */
      public Task withTitle(String newTitle) {
          return new Task(id, newTitle, description, status);
      }
  
      /**
       * Update the description.
       */
      public Task withDescription(String newDescription) {
          return new Task(id, title, newDescription, status);
      }
  
      /**
       * Update the status.
       */
      public Task withStatus(TaskStatus newStatus) {
          return new Task(id, title, description, newStatus);
      }
  }