/**
 * 故事数据管理器
 */
import { get, post } from '../utils/http';

export default class StoryManager {
  constructor() {
    this.storyList = [];
    this.currentStory = null;
    this.currentNodeKey = 'start';
    this.categories = [];
    this.pathHistory = []; // 记录用户走过的路径
  }

  /**
   * 加载故事列表
   */
  async loadStoryList(options = {}) {
    try {
      this.storyList = await get('/stories', options);
      return this.storyList;
    } catch (error) {
      console.error('加载故事列表失败:', error);
      return [];
    }
  }

  /**
   * 加载热门故事
   */
  async loadHotStories(limit = 10) {
    try {
      return await get('/stories/hot', { limit });
    } catch (error) {
      console.error('加载热门故事失败:', error);
      return [];
    }
  }

  /**
   * 加载分类列表
   */
  async loadCategories() {
    try {
      this.categories = await get('/stories/categories');
      return this.categories;
    } catch (error) {
      console.error('加载分类失败:', error);
      return [];
    }
  }

  /**
   * 加载故事详情
   */
  async loadStoryDetail(storyId) {
    try {
      this.currentStory = await get(`/stories/${storyId}`);
      this.currentNodeKey = 'start';
      this.pathHistory = []; // 重置路径历史
      
      // 记录游玩次数
      await post(`/stories/${storyId}/play`);
      
      return this.currentStory;
    } catch (error) {
      console.error('加载故事详情失败:', error);
      return null;
    }
  }

  /**
   * 获取当前节点
   */
  getCurrentNode() {
    if (!this.currentStory || !this.currentStory.nodes) return null;
    return this.currentStory.nodes[this.currentNodeKey];
  }

  /**
   * 选择选项，前进到下一个节点
   */
  selectChoice(choiceIndex) {
    const currentNode = this.getCurrentNode();
    if (!currentNode || !currentNode.choices || !currentNode.choices[choiceIndex]) {
      return null;
    }

    const choice = currentNode.choices[choiceIndex];
    
    // 记录路径历史
    this.pathHistory.push({
      nodeKey: this.currentNodeKey,
      content: currentNode.content,
      choice: choice.text
    });
    
    this.currentNodeKey = choice.nextNodeKey;
    
    return this.getCurrentNode();
  }

  /**
   * 检查当前节点是否为结局
   */
  isEnding() {
    const currentNode = this.getCurrentNode();
    return currentNode && currentNode.is_ending;
  }

  /**
   * 获取结局信息
   */
  getEndingInfo() {
    const currentNode = this.getCurrentNode();
    if (!currentNode || !currentNode.is_ending) return null;
    
    return {
      name: currentNode.ending_name,
      score: currentNode.ending_score,
      type: currentNode.ending_type,
      content: currentNode.content
    };
  }

  /**
   * 重置故事进度
   */
  resetStory() {
    this.currentNodeKey = 'start';
  }

  /**
   * 点赞故事
   */
  async likeStory(like = true) {
    if (!this.currentStory) return;
    await post(`/stories/${this.currentStory.id}/like`, { like });
  }

  /**
   * AI改写结局
   */
  async rewriteEnding(storyId, ending, prompt) {
    try {
      const result = await post(`/stories/${storyId}/rewrite`, {
        ending_name: ending?.name,
        ending_content: ending?.content,
        prompt: prompt
      }, { timeout: 60000 });
      return result;
    } catch (error) {
      console.error('AI改写失败:', error?.errMsg || error?.message || JSON.stringify(error));
      return null;
    }
  }

  /**
   * AI改写中间章节，生成新的剧情分支
   * @returns {Object|null} 成功返回新节点，失败返回 null（不改变当前状态）
   */
  async rewriteBranch(storyId, prompt, userId) {
    try {
      const currentNode = this.getCurrentNode();
      const result = await post(`/stories/${storyId}/rewrite-branch`, {
        userId: userId,
        currentNodeKey: this.currentNodeKey,
        pathHistory: this.pathHistory,
        currentContent: currentNode?.content || '',
        prompt: prompt
      }, { timeout: 300000 }); // 5分钟超时，AI生成需要较长时间
      
      // 检查是否有有效的 nodes
      if (result && result.nodes) {
        // AI 成功，将新分支合并到当前故事中
        Object.assign(this.currentStory.nodes, result.nodes);
        // 跳转到新分支的入口节点
        this.currentNodeKey = result.entryNodeKey || 'branch_1';
        return this.getCurrentNode();
      }
      
      // AI 失败，返回 null
      console.log('AI服务不可用:', result?.error || '未知错误');
      return null;
    } catch (error) {
      console.error('AI改写分支失败:', error?.errMsg || error?.message || JSON.stringify(error));
      return null;
    }
  }

  /**
   * AI续写故事
   */
  async continueStory(storyId, prompt) {
    try {
      const result = await post(`/stories/${storyId}/continue`, {
        current_node_key: this.currentNodeKey,
        prompt: prompt
      });
      return result;
    } catch (error) {
      console.error('AI续写失败:', error);
      return null;
    }
  }

  /**
   * AI创作新故事
   */
  async createStory(params) {
    try {
      const result = await post('/stories/ai-create', {
        genre: params.genre,
        keywords: params.keywords,
        protagonist: params.protagonist,
        conflict: params.conflict
      });
      return result;
    } catch (error) {
      console.error('AI创作失败:', error);
      return null;
    }
  }
}