Function computeOutline

src/renderer/src/services/messagesService.ts:397–501

(
  topicGroups: TopicGroup[],
  currentPath: ChatMessage[]
)

 * @returns OutlineNode 结构
 */
export function computeOutline(
  topicGroups: TopicGroup[],
  currentPath: ChatMessage[]
): OutlineNode[] {
  const outline: OutlineNode[] = []
  let currentTopicNode: OutlineNode | null = null

  // 构建消息 ID 到消息的映射
  const messageMap = new Map<string, ChatMessage>()
  for (const msg of currentPath) {
    messageMap.set(msg.id, msg)
  }

  // 构建 Topic startMessageId 到 TopicGroup 的映射
  const topicGroupMap = new Map<string, TopicGroup>()
  for (const group of topicGroups) {
    topicGroupMap.set(group.startMessageId, group)
  }

  // 截取消息内容作为预览
  const getContentPreview = (content: string, maxLen = 30): string => {
    const text = content.replace(/\n/g, ' ').trim()
    return text.length > maxLen ? text.slice(0, maxLen) + '...' : text
  }

  // 遍历当前路径
  for (const msg of currentPath) {
    const topicGroup = topicGroupMap.get(msg.id)

    // 处理 Topic 节点
    if (topicGroup) {
      const topicNode: OutlineNode = {
        id: `topic-${topicGroup.topicId}`,
        title: topicGroup.name,
        type: 'topic',
        messageId: msg.id,
        topicId: topicGroup.topicId,
        role: msg.role,
        children: [],
        collapsed: topicGroup.collapsed
      }

      // 所有 Topic 都是顶级节点
      outline.push(topicNode)
      currentTopicNode = topicNode

      // Topic 起始消息作为第一个子节点
      if (msg.title) {
        const titleNode: OutlineNode = {
          id: `title-${msg.id}`,
          title: msg.title,
          type: 'title',
          messageId: msg.id,
          role: msg.role
        }
        topicNode.children!.push(titleNode)
      } else {
        // 无标题的 Topic 起始消息