import express from 'express';
import { v4 as uuidv4 } from 'uuid';
import githubService from '../services/githubService.js';

const router = express.Router();

// 添加路由级别的日志中间件
router.use((req, res, next) => {
  console.log(`PPT Router - ${req.method} ${req.path} - Body:`, Object.keys(req.body || {}));
  next();
});

// 获取用户的PPT列表
router.get('/list', async (req, res, next) => {
  try {
    const userId = req.user.userId;
    const pptList = await githubService.getUserPPTList(userId);
    res.json(pptList);
  } catch (error) {
    next(error);
  }
});

// 获取指定PPT数据
router.get('/:pptId', async (req, res, next) => {
  try {
    const userId = req.user.userId;
    const { pptId } = req.params;

    console.log(`🔍 Fetching PPT: ${pptId} for user: ${userId}`);

    let pptData = null;
    let foundInRepo = -1;
    
    if (githubService.useMemoryStorage) {
      // 内存存储模式
      const result = await githubService.getPPTFromMemory(userId, pptId);
      if (result && result.content) {
        pptData = result.content;
        foundInRepo = 0;
        console.log(`✅ PPT found in memory storage`);
      }
    } else {
      // GitHub存储模式 - 尝试所有仓库
      console.log(`Available repositories: ${githubService.repositories.length}`);
      
      for (let i = 0; i < githubService.repositories.length; i++) {
        try {
          console.log(`📂 Checking repository ${i}: ${githubService.repositories[i]}`);
          const result = await githubService.getPPT(userId, pptId, i);
          if (result && result.content) {
            pptData = result.content;
            foundInRepo = i;
            console.log(`✅ PPT found in repository ${i}${result.isReassembled ? ' (reassembled from chunks)' : ''}`);
            break;
          }
        } catch (error) {
          console.log(`❌ PPT not found in repository ${i}: ${error.message}`);
          continue;
        }
      }
    }

    if (!pptData) {
      console.log(`❌ PPT ${pptId} not found for user ${userId}`);
      return res.status(404).json({ 
        error: 'PPT not found',
        pptId: pptId,
        userId: userId,
        storageMode: githubService.useMemoryStorage ? 'memory' : 'github'
      });
    }

    // 🔧 修复：标准化PPT数据格式，确保前端兼容性
    const standardizedPptData = {
      // 确保基本字段存在
      id: pptData.id || pptData.pptId || pptId,
      pptId: pptData.pptId || pptData.id || pptId,
      title: pptData.title || '未命名演示文稿',
      
      // 标准化slides数组
      slides: Array.isArray(pptData.slides) ? pptData.slides.map((slide, index) => ({
        id: slide.id || `slide-${index}`,
        elements: Array.isArray(slide.elements) ? slide.elements : [],
        background: slide.background || { type: 'solid', color: '#ffffff' },
        ...slide
      })) : [],
      
      // 标准化主题
      theme: pptData.theme || {
        backgroundColor: '#ffffff',
        themeColor: '#d14424',
        fontColor: '#333333',
        fontName: 'Microsoft YaHei'
      },
      
      // 🔧 关键修复：确保视口信息正确传递
      viewportSize: pptData.viewportSize || 1000,
      viewportRatio: pptData.viewportRatio || 0.5625,
      
      // 时间戳
      createdAt: pptData.createdAt || new Date().toISOString(),
      updatedAt: pptData.updatedAt || new Date().toISOString(),
      
      // 保留其他可能的属性
      ...pptData
    };

    // 🔧 新增：数据验证和修复
    if (standardizedPptData.slides.length === 0) {
      console.log(`⚠️ PPT ${pptId} has no slides, creating default slide`);
      standardizedPptData.slides = [{
        id: 'default-slide',
        elements: [],
        background: { type: 'solid', color: '#ffffff' }
      }];
    }

    // 验证视口比例的合理性
    if (standardizedPptData.viewportRatio <= 0 || standardizedPptData.viewportRatio > 2) {
      console.log(`⚠️ Invalid viewportRatio ${standardizedPptData.viewportRatio}, resetting to 0.5625`);
      standardizedPptData.viewportRatio = 0.5625;
    }

    // 验证视口尺寸的合理性
    if (standardizedPptData.viewportSize <= 0 || standardizedPptData.viewportSize > 2000) {
      console.log(`⚠️ Invalid viewportSize ${standardizedPptData.viewportSize}, resetting to 1000`);
      standardizedPptData.viewportSize = 1000;
    }

    console.log(`✅ Successfully found and standardized PPT ${pptId}:`, {
      slidesCount: standardizedPptData.slides.length,
      viewportSize: standardizedPptData.viewportSize,
      viewportRatio: standardizedPptData.viewportRatio,
      storageMode: githubService.useMemoryStorage ? 'memory' : `repository ${foundInRepo}`
    });

    res.json(standardizedPptData);
  } catch (error) {
    console.error(`❌ Error fetching PPT ${req.params.pptId}:`, error);
    next(error);
  }
});

// 保存PPT数据 - 新架构版本
router.post('/save', async (req, res, next) => {
  try {
    const userId = req.user.userId;
    const { pptId, title, slides, theme, viewportSize, viewportRatio } = req.body;

    console.log(`🔄 Starting PPT save for user ${userId}, PPT ID: ${pptId}`);
    console.log(`📊 Request body analysis:`, {
      pptId: !!pptId,
      title: title?.length || 0,
      slidesCount: Array.isArray(slides) ? slides.length : 'not array',
      theme: !!theme,
      requestSize: req.get('content-length'),
      storageMode: githubService.useMemoryStorage ? 'memory' : 'github'
    });

    if (!pptId || !slides) {
      console.log(`❌ Missing required fields - pptId: ${!!pptId}, slides: ${!!slides}`);
      return res.status(400).json({ error: 'PPT ID and slides are required' });
    }

    // 验证slides数组
    if (!Array.isArray(slides) || slides.length === 0) {
      console.log(`❌ Invalid slides array - isArray: ${Array.isArray(slides)}, length: ${slides?.length || 0}`);
      return res.status(400).json({ error: 'Slides must be a non-empty array' });
    }

    // 构建标准化的PPT数据结构
    const pptData = {
      id: pptId,
      title: title || '未命名演示文稿',
      slides: slides.map((slide, index) => ({
        id: slide.id || `slide-${index}`,
        elements: Array.isArray(slide.elements) ? slide.elements : [],
        background: slide.background || { type: 'solid', color: '#ffffff' },
        ...slide
      })),
      theme: theme || {
        backgroundColor: '#ffffff',
        themeColor: '#d14424',
        fontColor: '#333333',
        fontName: 'Microsoft YaHei'
      },
      viewportSize: viewportSize || 1000,
      viewportRatio: viewportRatio || 0.5625,
      createdAt: new Date().toISOString(),
      updatedAt: new Date().toISOString()
    };

    // 计算文件大小分析
    const jsonData = JSON.stringify(pptData);
    const totalDataSize = Buffer.byteLength(jsonData, 'utf8');
    
    console.log(`📊 PPT data analysis:`);
    console.log(`  - Total slides: ${slides.length}`);
    console.log(`  - Total data size: ${totalDataSize} bytes (${(totalDataSize / 1024).toFixed(2)} KB)`);
    console.log(`  - Average slide size: ${(totalDataSize / slides.length / 1024).toFixed(2)} KB`);
    
    // 分析每个slide的大小
    const slideAnalysis = slides.map((slide, index) => {
      const slideJson = JSON.stringify(slide);
      const slideSize = Buffer.byteLength(slideJson, 'utf8');
      return {
        index,
        size: slideSize,
        sizeKB: (slideSize / 1024).toFixed(2),
        elementsCount: slide.elements?.length || 0,
        hasLargeContent: slideSize > 800 * 1024 // 800KB+
      };
    });
    
    const largeSlides = slideAnalysis.filter(s => s.hasLargeContent);
    const maxSlideSize = Math.max(...slideAnalysis.map(s => s.size));
    
    console.log(`📋 Slide size analysis:`);
    console.log(`  - Largest slide: ${(maxSlideSize / 1024).toFixed(2)} KB`);
    console.log(`  - Large slides (>800KB): ${largeSlides.length}`);
    if (largeSlides.length > 0) {
      console.log(`  - Large slide indices: ${largeSlides.map(s => s.index).join(', ')}`);
    }

    try {
      let result;
      
      console.log(`💾 Using storage mode: ${githubService.useMemoryStorage ? 'memory' : 'GitHub folder architecture'}`);
      
      if (githubService.useMemoryStorage) {
        // 内存存储模式
        result = await githubService.savePPTToMemory(userId, pptId, pptData);
        console.log(`✅ PPT saved to memory storage:`, result);
      } else {
        // GitHub存储模式 - 使用新的文件夹架构
        console.log(`🐙 Using GitHub folder storage for ${pptId}`);
        console.log(`📂 Available repositories: ${githubService.repositories?.length || 0}`);
        
        if (!githubService.repositories || githubService.repositories.length === 0) {
          throw new Error('No GitHub repositories configured');
        }
        
        console.log(`🔍 Pre-save validation:`);
        console.log(`  - Repository 0: ${githubService.repositories[0]}`);
        console.log(`  - Token configured: ${!!githubService.token}`);
        console.log(`  - API URL: ${githubService.apiUrl}`);
        
        result = await githubService.savePPT(userId, pptId, pptData, 0);
        console.log(`✅ PPT saved to GitHub folder storage:`, result);
      }
      
      console.log(`✅ PPT save completed successfully:`, {
        pptId,
        userId,
        slideCount: slides.length,
        totalDataSize,
        storageType: result.storage || 'unknown',
        compressionApplied: result.compressionSummary?.compressedSlides > 0,
        storageMode: githubService.useMemoryStorage ? 'memory' : 'github'
      });

      const response = { 
        message: 'PPT saved successfully', 
        pptId,
        slidesCount: slides.length,
        savedAt: new Date().toISOString(),
        totalFileSize: `${(totalDataSize / 1024).toFixed(2)} KB`,
        storageType: result.storage || 'unknown',
        storageMode: githubService.useMemoryStorage ? 'memory' : 'github',
        architecture: 'folder-based',
        slideAnalysis: {
          totalSlides: slides.length,
          largestSlideSize: `${(maxSlideSize / 1024).toFixed(2)} KB`,
          largeSlides: largeSlides.length,
          averageSlideSize: `${(totalDataSize / slides.length / 1024).toFixed(2)} KB`
        }
      };

      // 添加压缩信息
      if (result.compressionSummary) {
        response.compression = {
          applied: result.compressionSummary.compressedSlides > 0,
          compressedSlides: result.compressionSummary.compressedSlides,
          totalSlides: result.compressionSummary.totalSlides,
          savedSlides: result.compressionSummary.savedSlides,
          failedSlides: result.compressionSummary.failedSlides,
          originalSize: `${(result.compressionSummary.totalOriginalSize / 1024).toFixed(2)} KB`,
          finalSize: `${(result.compressionSummary.totalFinalSize / 1024).toFixed(2)} KB`,
          savedSpace: `${((result.compressionSummary.totalOriginalSize - result.compressionSummary.totalFinalSize) / 1024).toFixed(2)} KB`,
          compressionRatio: `${(result.compressionSummary.compressionRatio * 100).toFixed(1)}%`
        };
        
        if (result.compressionSummary.compressedSlides > 0) {
          response.message = `PPT saved successfully with ${result.compressionSummary.compressedSlides} slides optimized for storage`;
          response.optimization = `Automatic compression applied to ${result.compressionSummary.compressedSlides} large slides, saving ${response.compression.savedSpace}`;
        }

        // 添加保存警告信息
        if (result.compressionSummary.failedSlides > 0) {
          response.warning = `${result.compressionSummary.failedSlides} slides failed to save`;
          response.partialSave = true;
          response.savedSlides = result.compressionSummary.savedSlides;
          response.failedSlides = result.compressionSummary.failedSlides;
          
          if (result.compressionSummary.errors) {
            response.slideErrors = result.compressionSummary.errors;
          }
        }
      }

      // 添加存储路径信息
      if (result.folderPath) {
        response.storagePath = result.folderPath;
        response.architecture = 'folder-based (meta.json + individual slide files)';
      }

      // 添加警告信息
      if (result.warnings) {
        response.warnings = result.warnings;
      }

      res.json(response);
      
    } catch (saveError) {
      console.error(`❌ Save operation failed:`, {
        error: saveError.message,
        stack: saveError.stack,
        userId,
        pptId,
        slidesCount: slides.length,
        totalDataSize,
        errorName: saveError.name,
        errorCode: saveError.code
      });
      
      let errorResponse = {
        error: 'PPT save failed',
        details: saveError.message,
        pptId: pptId,
        slidesCount: slides.length,
        totalFileSize: `${(totalDataSize / 1024).toFixed(2)} KB`,
        timestamp: new Date().toISOString(),
        slideAnalysis: {
          largestSlideSize: `${(maxSlideSize / 1024).toFixed(2)} KB`,
          largeSlides: largeSlides.length
        }
      };
      
      // 根据错误类型提供具体建议
      if (saveError.message.includes('File too large') || saveError.message.includes('exceeds')) {
        errorResponse.error = 'Slide file too large for storage';
        errorResponse.suggestion = 'Some slides are too large even after compression. Try reducing image sizes or slide complexity.';
        errorResponse.limits = {
          maxSlideSize: '999 KB per slide',
          largestSlideSize: `${(maxSlideSize / 1024).toFixed(2)} KB`,
          oversizeSlides: largeSlides.length
        };
        return res.status(413).json(errorResponse);
      }
      
      if (saveError.message.includes('Failed to compress slide')) {
        errorResponse.error = 'Slide compression failed';
        errorResponse.suggestion = 'Unable to compress slides to acceptable size. Try manually reducing content complexity.';
        errorResponse.compressionError = true;
        return res.status(500).json(errorResponse);
      }
      
      if (saveError.message.includes('GitHub API') || saveError.message.includes('GitHub')) {
        errorResponse.error = 'GitHub storage service error';
        errorResponse.suggestion = 'Temporary GitHub service issue. Please try again in a few minutes.';
        errorResponse.githubError = true;
        return res.status(502).json(errorResponse);
      }
      
      if (saveError.message.includes('No GitHub repositories')) {
        errorResponse.error = 'Storage configuration error';
        errorResponse.suggestion = 'GitHub repositories not properly configured. Please contact support.';
        errorResponse.configError = true;
        return res.status(500).json(errorResponse);
      }
      
      // 网络相关错误
      if (saveError.code === 'ETIMEDOUT' || saveError.message.includes('timeout')) {
        errorResponse.error = 'Storage operation timeout';
        errorResponse.suggestion = 'The save operation took too long. Try reducing file size or try again later.';
        errorResponse.timeoutError = true;
        return res.status(504).json(errorResponse);
      }
      
      // 默认错误
      errorResponse.suggestion = 'Unknown save error. Please try again or contact support if the problem persists.';
      errorResponse.unknownError = true;
      return res.status(500).json(errorResponse);
    }
    
  } catch (error) {
    console.error(`❌ PPT save failed for user ${req.user?.userId}, PPT ID: ${req.body?.pptId}:`, {
      error: error.message,
      stack: error.stack,
      userId: req.user?.userId,
      pptId: req.body?.pptId,
      requestSize: req.get('content-length'),
      slidesCount: req.body?.slides?.length,
      errorName: error.name,
      errorCode: error.code
    });

    // 提供更详细的错误处理
    let errorResponse = {
      error: 'PPT save processing failed',
      details: error.message,
      timestamp: new Date().toISOString(),
      userId: req.user?.userId,
      pptId: req.body?.pptId,
      architecture: 'folder-based'
    };

    if (error.message.includes('Invalid slide data')) {
      errorResponse.error = 'Invalid slide data detected';
      errorResponse.suggestion = 'One or more slides contain invalid or corrupted data';
      return res.status(400).json(errorResponse);
    }

    if (error.message.includes('JSON')) {
      errorResponse.error = 'Invalid data format';
      errorResponse.suggestion = 'Check slide data structure and content';
      return res.status(400).json(errorResponse);
    }

    errorResponse.suggestion = 'Unknown processing error. Please try again or contact support if the problem persists.';
    next(error);
  }
});

// 创建新PPT
router.post('/create', async (req, res, next) => {
  try {
    const userId = req.user.userId;
    const { title } = req.body;
    
    if (!title) {
      return res.status(400).json({ error: 'Title is required' });
    }

    const pptId = uuidv4();
    const now = new Date().toISOString();
    
    // 确保数据格式与前端store一致
    const pptData = {
      id: pptId,
      title,
      theme: {
        backgroundColor: '#ffffff',
        themeColor: '#d14424',
        fontColor: '#333333',
        fontName: 'Microsoft YaHei'
      },
      slides: [
        {
          id: uuidv4(),
          elements: [
            {
              type: 'text',
              id: uuidv4(),
              left: 150,
              top: 200,
              width: 600,
              height: 100,
              content: title,
              fontSize: 32,
              fontName: 'Microsoft YaHei',
              defaultColor: '#333333',
              bold: true,
              align: 'center'
            }
          ],
          background: {
            type: 'solid',
            color: '#ffffff'
          }
        }
      ],
      // 确保视口信息与前端一致
      viewportSize: 1000,
      viewportRatio: 0.5625,
      createdAt: now,
      updatedAt: now
    };

    const fileName = `${pptId}.json`;
    
    console.log(`Creating PPT for user ${userId}, using ${githubService.useMemoryStorage ? 'memory' : 'GitHub'} storage`);
    
    if (githubService.useMemoryStorage) {
      await githubService.saveToMemory(userId, fileName, pptData);
    } else {
      await githubService.saveFile(userId, fileName, pptData);
    }
    
    console.log(`PPT created successfully: ${pptId}`);
    res.json({ success: true, pptId, pptData });
  } catch (error) {
    console.error('PPT creation error:', error);
    next(error);
  }
});

// 删除PPT
router.delete('/:pptId', async (req, res, next) => {
  try {
    const userId = req.user.userId;
    const { pptId } = req.params;
    const fileName = `${pptId}.json`;

    if (githubService.useMemoryStorage) {
      // 内存存储模式
      const deleted = githubService.memoryStorage.delete(`users/${userId}/${fileName}`);
      if (!deleted) {
        return res.status(404).json({ error: 'PPT not found' });
      }
    } else {
      // GitHub存储模式 - 从所有仓库中删除
      let deleted = false;
      for (let i = 0; i < githubService.repositories.length; i++) {
        try {
          await githubService.deleteFile(userId, fileName, i);
          deleted = true;
          break; // 只需要从一个仓库删除成功即可
        } catch (error) {
          // 继续尝试其他仓库
          continue;
        }
      }
      
      if (!deleted) {
        return res.status(404).json({ error: 'PPT not found in any repository' });
      }
    }

    res.json({ message: 'PPT deleted successfully' });
  } catch (error) {
    next(error);
  }
});

// 复制PPT
router.post('/:pptId/copy', async (req, res, next) => {
  try {
    const userId = req.user.userId;
    const { pptId } = req.params;
    const { title } = req.body;
    const sourceFileName = `${pptId}.json`;

    // 获取源PPT数据
    let sourcePPT = null;
    
    if (githubService.useMemoryStorage) {
      // 内存存储模式
      sourcePPT = await githubService.getFromMemory(userId, sourceFileName);
    } else {
      // GitHub存储模式
      for (let i = 0; i < githubService.repositories.length; i++) {
        try {
          const result = await githubService.getFile(userId, sourceFileName, i);
          if (result) {
            sourcePPT = result;
            break;
          }
        } catch (error) {
          continue;
        }
      }
    }

    if (!sourcePPT) {
      return res.status(404).json({ error: 'Source PPT not found' });
    }

    // 创建新的PPT ID和数据
    const newPptId = uuidv4();
    const newFileName = `${newPptId}.json`;
    const newPPTData = {
      ...sourcePPT,
      id: newPptId,
      title: title || `${sourcePPT.title} - 副本`,
      createdAt: new Date().toISOString(),
      updatedAt: new Date().toISOString()
    };

    // 保存复制的PPT
    if (githubService.useMemoryStorage) {
      await githubService.saveToMemory(userId, newFileName, newPPTData);
    } else {
      await githubService.saveFile(userId, newFileName, newPPTData, 0);
    }

    res.json({ 
      message: 'PPT copied successfully', 
      pptId: newPptId,
      ppt: newPPTData
    });
  } catch (error) {
    next(error);
  }
});

export default router;