import { v4 as uuidv4 } from 'uuid';

// 内存存储，用于开发和测试
class MemoryStorageService {
  constructor() {
    this.storage = new Map(); // userId -> Map<pptId, pptData>
  }

  // 获取用户的所有PPT列表
  async getUserPPTList(userId) {
    const userStorage = this.storage.get(userId) || new Map();
    const pptList = Array.from(userStorage.entries()).map(([pptId, pptData]) => ({
      name: pptId,
      title: pptData.title || '未命名演示文稿',
      lastModified: pptData.updatedAt,
      repoIndex: 0,
      repoUrl: 'memory://local'
    }));
    return pptList;
  }

  // 获取PPT数据
  async getFile(userId, fileName) {
    const pptId = fileName.replace('.json', '');
    const userStorage = this.storage.get(userId) || new Map();
    const pptData = userStorage.get(pptId);
    
    if (!pptData) {
      return null;
    }
    
    return {
      content: pptData,
      sha: 'memory-sha'
    };
  }

  // 保存PPT数据
  async saveFile(userId, fileName, data) {
    const pptId = fileName.replace('.json', '');
    
    if (!this.storage.has(userId)) {
      this.storage.set(userId, new Map());
    }
    
    const userStorage = this.storage.get(userId);
    userStorage.set(pptId, {
      ...data,
      updatedAt: new Date().toISOString()
    });
    
    return { success: true };
  }

  // 删除PPT
  async deleteFile(userId, fileName) {
    const pptId = fileName.replace('.json', '');
    const userStorage = this.storage.get(userId);
    
    if (!userStorage || !userStorage.has(pptId)) {
      throw new Error('File not found');
    }
    
    userStorage.delete(pptId);
    return { success: true };
  }
}

export default new MemoryStorageService();