/**
 * 文件读写操作模块
 * 负责文件系统的读写操作，包括聊天记录的保存和读取
 */

import { ipcMain } from 'electron';
import { readdir, writeFile, readFile, mkdir, rm, stat, appendFile } from 'fs/promises';
import { join, dirname, isAbsolute } from 'path';

/**
 * 递归计算目录大小
 * @param {string} dirPath - 目录路径
 * @returns {Promise<number>} 目录总大小（字节）
 */
async function calculateDirSize(dirPath) {
  let totalSize = 0;
  try {
    const entries = await readdir(dirPath, { withFileTypes: true });
    for (const entry of entries) {
      const entryPath = join(dirPath, entry.name);
      try {
        if (entry.isFile()) {
          const stats = await stat(entryPath);
          totalSize += stats.size;
        } else if (entry.isDirectory()) {
          totalSize += await calculateDirSize(entryPath);
        }
      } catch (e) {
        // 忽略无法访问的文件/目录
      }
    }
  } catch (e) {
    // 忽略无法读取的目录
  }
  return totalSize;
}
import { fileURLToPath } from 'url';
import { captureScreenshot } from './adb/screenshot.js';
import { getDeviceResolution } from './adb/device-info.js';
import { extractChatHistory as extractChatHistoryFromFunc, getLastMessage as getLastMessageFromFunc, ocrFullScreen as ocrFullScreenFromFunc } from './func/ocr-chat.js';

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

/**
 * 获取最新的聊天记录文件
 * @param {string} absoluteWorkflowPath - 工作流文件夹的绝对路径
 * @returns {Promise<Object|null>} 最新的文件信息，如果不存在则返回 null
 */
async function getLatestHistoryFile(absoluteWorkflowPath) {
  try {
    const historyDir = join(absoluteWorkflowPath, 'history');
    const files = await readdir(historyDir, { withFileTypes: true });
    
    // 过滤出 JSON 文件（chat_*.json）
    const jsonFiles = files
      .filter(file => file.isFile() && file.name.startsWith('chat_') && file.name.endsWith('.json'))
      .map(file => ({
        name: file.name,
        path: join(historyDir, file.name)
      }));

    if (jsonFiles.length === 0) {
      return null;
    }

    // 获取所有文件的统计信息（修改时间）
    const filesWithStats = await Promise.all(
      jsonFiles.map(async (file) => {
        const stats = await stat(file.path);
        return {
          ...file,
          mtime: stats.mtime
        };
      })
    );

    // 按修改时间排序（最新的在前）
    filesWithStats.sort((a, b) => b.mtime.getTime() - a.mtime.getTime());

    // 返回最新的文件
    return filesWithStats[0];
  } catch (error) {
    // 如果目录不存在或读取失败，返回 null
    return null;
  }
}

/**
 * 将相对路径转换为绝对路径
 * @param {string} workflowFolderPath - 工作流文件夹路径（相对或绝对）
 * @returns {string} 绝对路径
 */
function getAbsoluteWorkflowPath(workflowFolderPath) {
  if (isAbsolute(workflowFolderPath)) {
    return workflowFolderPath;
  }
  
  if (workflowFolderPath.startsWith('static/processing/')) {
    const folderName = workflowFolderPath.replace('static/processing/', '');
    return join(__dirname, '..', 'static', 'processing', folderName);
  } else if (workflowFolderPath.startsWith('static\\processing\\')) {
    const folderName = workflowFolderPath.replace('static\\processing\\', '');
    return join(__dirname, '..', 'static', 'processing', folderName);
  } else {
    return join(__dirname, '..', 'static', 'processing', workflowFolderPath);
  }
}

/**
 * 注册文件读写相关的 IPC handlers
 */
export function registerIpcHandlers() {
  // 确保目录存在
  ipcMain.handle('ensure-directory', async (event, dirPath) => {
    try {
      await mkdir(dirPath, { recursive: true });
      return { success: true };
    } catch (error) {
      return { success: false, error: error.message };
    }
  });

  // 写入文本文件
  ipcMain.handle('write-text-file', async (event, filePath, content) => {
    try {
      // 如果 filePath 是绝对路径，直接使用
      // 否则，相对于项目根目录（__dirname 的父目录）
      let absoluteFilePath = filePath;
      if (!isAbsolute(filePath)) {
        // 相对路径，相对于项目根目录
        absoluteFilePath = join(__dirname, '..', filePath);
      }
      
      // 确保目录存在
      const dir = dirname(absoluteFilePath);
      await mkdir(dir, { recursive: true });
      
      await writeFile(absoluteFilePath, content, 'utf-8');
      return { success: true };
    } catch (error) {
      return { success: false, error: error.message };
    }
  });

  // 读取文本文件
  ipcMain.handle('read-text-file', async (event, filePath) => {
    try {
      // 如果 filePath 是绝对路径，直接使用
      // 否则，相对于项目根目录（__dirname 的父目录）
      let absoluteFilePath = filePath;
      if (!isAbsolute(filePath)) {
        // 相对路径，相对于项目根目录
        absoluteFilePath = join(__dirname, '..', filePath);
      }
      
      const content = await readFile(absoluteFilePath, 'utf-8');
      return { success: true, content };
    } catch (error) {
      // 如果文件不存在，返回空字符串而不是错误
      if (error.code === 'ENOENT') {
        return { success: true, content: '' };
      }
      return { success: false, error: error.message };
    }
  });

  // 读取图片文件为 base64
  ipcMain.handle('read-image-file-as-base64', async (event, filePath) => {
    try {
      // 如果 filePath 是绝对路径，直接使用
      // 否则，相对于项目根目录
      let absoluteFilePath = filePath;
      if (!isAbsolute(filePath)) {
        absoluteFilePath = join(__dirname, '..', filePath);
      }
      
      // 读取文件为 Buffer
      const fileBuffer = await readFile(absoluteFilePath);
      // 转换为 base64
      const base64 = fileBuffer.toString('base64');
      return { success: true, data: base64 };
    } catch (error) {
      return { success: false, error: error.message };
    }
  });

  // 保存 base64 图片到文件
  ipcMain.handle('save-base64-image', async (event, base64Data, savePath) => {
    try {
      // 处理保存路径
      let absoluteSavePath = savePath;
      if (!isAbsolute(savePath)) {
        // 如果是相对路径，相对于项目根目录
        if (savePath.startsWith('static/processing/')) {
          absoluteSavePath = join(__dirname, '..', savePath);
        } else {
          absoluteSavePath = join(__dirname, '..', savePath);
        }
      }

      // 确保目录存在
      const dir = dirname(absoluteSavePath);
      await mkdir(dir, { recursive: true });

      // 将 base64 转换为 Buffer 并保存
      const imageBuffer = Buffer.from(base64Data, 'base64');
      await writeFile(absoluteSavePath, imageBuffer);

      // 验证文件是否成功写入（检查文件大小）
      const { access, constants } = await import('fs/promises');
      await access(absoluteSavePath, constants.F_OK);
      const fileStats = await stat(absoluteSavePath);
      
      if (fileStats.size === 0) {
        return { success: false, error: '文件保存失败：文件大小为0' };
      }
      
      if (fileStats.size < 100) {
        // JPEG/PNG 文件至少应该有几百字节
        return { success: false, error: `文件保存失败：文件大小异常（${fileStats.size} 字节）` };
      }

      return { success: true, fileSize: fileStats.size };
    } catch (error) {
      return { success: false, error: error.message };
    }
  });

  // 追加日志到文件
  ipcMain.handle('append-log', async (event, workflowFolderPath, logMessage) => {
    try {
      const absoluteWorkflowPath = getAbsoluteWorkflowPath(workflowFolderPath);
      const logFilePath = join(absoluteWorkflowPath, 'log.txt');
      
      // 添加时间戳（精确到毫秒）
      const now = new Date();
      const year = now.getFullYear();
      const month = String(now.getMonth() + 1).padStart(2, '0');
      const day = String(now.getDate()).padStart(2, '0');
      const hour = String(now.getHours()).padStart(2, '0');
      const minute = String(now.getMinutes()).padStart(2, '0');
      const second = String(now.getSeconds()).padStart(2, '0');
      const ms = String(now.getMilliseconds()).padStart(3, '0');
      const timestamp = `${year}-${month}-${day} ${hour}:${minute}:${second}.${ms}`;
      const logLine = `[${timestamp}] ${logMessage}\n`;
      
      await appendFile(logFilePath, logLine, 'utf-8');
      return { success: true };
    } catch (error) {
      // 日志写入失败不应该影响主流程
      return { success: false, error: error.message };
    }
  });

  // 保存聊天记录到 chat-history.txt（追加模式，所有记录保存在一个文件）
  // 格式：{"data":"时间戳","friend":"消息","me":"消息"}，允许重复键（虽然JSON不支持，但保存为文本格式）
  ipcMain.handle('save-chat-history-txt', async (event, workflowFolderPath, messages) => {
    try {
      const absoluteWorkflowPath = getAbsoluteWorkflowPath(workflowFolderPath);
      const historyDir = join(absoluteWorkflowPath, 'history');
      await mkdir(historyDir, { recursive: true });

      const chatHistoryPath = join(historyDir, 'chat-history.txt');
      
      // 读取现有文件（如果存在）
      // 由于JSON不支持重复键，我们需要从文本解析每一行
      let existingEntries = [];
      try {
        const existingContent = await readFile(chatHistoryPath, 'utf-8');
        if (existingContent.trim()) {
          // 使用正则表达式解析每一行：\t"key":"value",
          const lines = existingContent.split('\n');
          for (const line of lines) {
            // 匹配格式：\t"key":"value", 或 \t"key":"value"
            const match = line.match(/^\s*"([^"]+)":\s*"([^"]*)"\s*,?\s*$/);
            if (match) {
              existingEntries.push({ type: match[1], value: match[2] });
            }
          }
        }
      } catch (e) {
        // 文件不存在或格式错误，使用空数组
        existingEntries = [];
      }

      // 获取当前时间戳（格式：昨天 HH:MM 或 今天 HH:MM）
      const now = new Date();
      const today = new Date(now.getFullYear(), now.getMonth(), now.getDate());
      const yesterday = new Date(today);
      yesterday.setDate(yesterday.getDate() - 1);
      
      let timeLabel = '';
      const hour = now.getHours();
      const minute = now.getMinutes();
      
      if (now >= today) {
        timeLabel = `今天 ${String(hour).padStart(2, '0')}:${String(minute).padStart(2, '0')}`;
      } else if (now >= yesterday) {
        timeLabel = `昨天 ${String(hour).padStart(2, '0')}:${String(minute).padStart(2, '0')}`;
      } else {
        timeLabel = `${now.getFullYear()}/${now.getMonth() + 1}/${now.getDate()} ${String(hour).padStart(2, '0')}:${String(minute).padStart(2, '0')}`;
      }

      // 合并现有数据和新消息
      const mergedEntries = [...existingEntries];
      
      // 添加时间戳
      mergedEntries.push({ type: 'data', value: timeLabel });
      
      // 添加新消息
      for (const msg of messages) {
        const sender = msg.sender || msg.role || '';
        const text = (msg.text || msg.message || '').trim();
        
        if (text && (sender === 'friend' || sender === 'me')) {
          mergedEntries.push({ type: sender, value: text });
        }
      }

      // 格式化为用户要求的格式（对象格式，允许重复键）
      // 由于JSON不支持重复键，我们保存为格式化的文本，模拟对象格式
      const formattedLines = [];
      formattedLines.push('{');
      for (let i = 0; i < mergedEntries.length; i++) {
        const item = mergedEntries[i];
        const key = JSON.stringify(item.type);
        const value = JSON.stringify(item.value);
        const comma = i < mergedEntries.length - 1 ? ',' : '';
        formattedLines.push(`\t${key}:${value}${comma}`);
      }
      formattedLines.push('}');
      
      // 保存为格式化的文本
      await writeFile(chatHistoryPath, formattedLines.join('\n'), 'utf-8');

      return { success: true, filePath: chatHistoryPath };
    } catch (error) {
      return { success: false, error: error.message };
    }
  });

  // 保存聊天记录到 history 文件夹（旧格式，保持向后兼容）
  ipcMain.handle('save-chat-history', async (event, workflowFolderPath, historyData) => {
    try {
      const absoluteWorkflowPath = getAbsoluteWorkflowPath(workflowFolderPath);
      const historyDir = join(absoluteWorkflowPath, 'history');
      await mkdir(historyDir, { recursive: true });

      // 获取最新的历史文件
      const latestFile = await getLatestHistoryFile(absoluteWorkflowPath);
      
      let targetFilePath = null;
      let mergedMessages = [];
      
      // 如果存在最新文件，检查是否可以追加
      if (latestFile) {
        try {
          const latestStats = await stat(latestFile.path);
          const latestFileSize = latestStats.size; // 文件大小（字节）
          
          // 检查文件大小是否超过1MB（1MB = 1024 * 1024 字节）
          if (latestFileSize < 1024 * 1024) {
            // 文件大小未超过1MB，可以追加
            const latestContent = await readFile(latestFile.path, 'utf-8');
            const latestData = JSON.parse(latestContent);
            const latestMessages = latestData.messages || [];
            const newMessages = historyData.messages || [];
            
            // 简单合并消息（不去重，去重逻辑在 saveChatHistory 中处理）
            mergedMessages = [...latestMessages, ...newMessages];
            targetFilePath = latestFile.path;
            
          } else {
            // 文件大小超过1MB，创建新文件
            mergedMessages = historyData.messages || [];
          }
        } catch (compareError) {
          // 读取最新文件失败，将创建新文件
          mergedMessages = historyData.messages || [];
        }
      } else {
        // 不存在历史文件，直接使用新消息
        mergedMessages = historyData.messages || [];
      }

      // 如果还没有确定目标文件路径，创建新文件
      if (!targetFilePath) {
        const timestamp = new Date().toISOString().replace(/[:.]/g, '-').slice(0, -5);
        const fileName = `chat_${timestamp}.json`;
        targetFilePath = join(historyDir, fileName);
      }

      // 构建保存的数据结构
      const now = new Date();
      const finalData = {
        timestamp: now.toISOString(),
        messageCount: mergedMessages.length,
        messages: mergedMessages
      };

      // 保存到文件
      await writeFile(targetFilePath, JSON.stringify(finalData, null, 2), 'utf-8');


      // 限制 history 文件夹总大小不超过10MB，超过则删除最早的文件
      try {
        const files = await readdir(historyDir, { withFileTypes: true });
        // 过滤出 JSON 文件（chat_*.json）
        const jsonFiles = files
          .filter(file => file.isFile() && file.name.startsWith('chat_') && file.name.endsWith('.json'))
          .map(file => ({
            name: file.name,
            path: join(historyDir, file.name)
          }));

        // 获取所有文件的大小和统计信息
        const filesWithStats = await Promise.all(
          jsonFiles.map(async (file) => {
            const stats = await stat(file.path);
            return {
              ...file,
              size: stats.size,
              birthtime: stats.birthtime || stats.mtime,
              mtime: stats.mtime
            };
          })
        );

        // 计算总大小
        let totalSize = filesWithStats.reduce((sum, file) => sum + file.size, 0);
        const maxSize = 10 * 1024 * 1024; // 10MB

        // 按时间排序（最早的在前）
        filesWithStats.sort((a, b) => {
          const timeA = a.birthtime.getTime();
          const timeB = b.birthtime.getTime();
          return timeA - timeB;
        });

        // 如果总大小超过10MB，删除最早的文件直到总大小小于10MB
        const filesToDelete = [];
        for (const file of filesWithStats) {
          if (totalSize <= maxSize) {
            break;
          }
          filesToDelete.push(file);
          totalSize -= file.size;
        }

        // 删除文件
        for (const file of filesToDelete) {
          try {
            await rm(file.path, { force: true });
          } catch (deleteError) {
            // 删除文件失败，忽略错误
          }
        }
      } catch (cleanupError) {
        // 清理失败不影响保存操作
      }

      return { success: true, filePath: targetFilePath };
    } catch (error) {
      return { success: false, error: error.message };
    }
  });

  // 保存聊天记录总结
  ipcMain.handle('save-chat-history-summary', async (event, workflowFolderPath, summary) => {
    try {
      const absoluteWorkflowPath = getAbsoluteWorkflowPath(workflowFolderPath);
      const historyDir = join(absoluteWorkflowPath, 'history');
      await mkdir(historyDir, { recursive: true });

      const summaryFilePath = join(historyDir, 'summary.txt');
      await writeFile(summaryFilePath, summary, 'utf-8');

      return { success: true };
    } catch (error) {
      return { success: false, error: error.message };
    }
  });

  // 读取聊天记录总结
  ipcMain.handle('get-chat-history-summary', async (event, workflowFolderPath) => {
    try {
      const absoluteWorkflowPath = getAbsoluteWorkflowPath(workflowFolderPath);
      const summaryFilePath = join(absoluteWorkflowPath, 'history', 'summary.txt');

      // 检查文件是否存在
      try {
        const { access, constants } = await import('fs/promises');
        await access(summaryFilePath, constants.F_OK);
        const summary = await readFile(summaryFilePath, 'utf-8');
        return { success: true, summary: summary.trim() };
      } catch (error) {
        // 文件不存在，返回空字符串
        return { success: true, summary: '' };
      }
    } catch (error) {
      return { success: false, error: error.message };
    }
  });

  // 读取最新聊天记录的所有消息
  ipcMain.handle('read-latest-chat-history', async (event, workflowFolderPath) => {
    try {
      const absoluteWorkflowPath = getAbsoluteWorkflowPath(workflowFolderPath);

      // 获取最新的聊天记录文件
      const latestFile = await getLatestHistoryFile(absoluteWorkflowPath);
      
      if (!latestFile) {
        return { success: false, error: '未找到聊天记录文件' };
      }

      // 读取文件内容
      const fileContent = await readFile(latestFile.path, 'utf-8');
      const historyData = JSON.parse(fileContent);

      // 返回消息数组
      return { 
        success: true, 
        messages: historyData.messages || [] 
      };
    } catch (error) {
      return { success: false, error: error.message };
    }
  });

  // 读取最新聊天记录的最后一条消息
  ipcMain.handle('read-last-message', async (event, workflowFolderPath) => {
    try {
      const absoluteWorkflowPath = getAbsoluteWorkflowPath(workflowFolderPath);

      // 获取最新的聊天记录文件
      const latestFile = await getLatestHistoryFile(absoluteWorkflowPath);
      
      if (!latestFile) {
        return { success: false, error: '未找到聊天记录文件' };
      }

      // 读取文件内容
      const fileContent = await readFile(latestFile.path, 'utf-8');
      const historyData = JSON.parse(fileContent);

      // 获取最后一条消息
      const messages = historyData.messages || [];
      if (messages.length === 0) {
        return { success: false, error: '聊天记录为空' };
      }

      const lastMessage = messages[messages.length - 1];

      // 返回最后一条消息的文本和发送者
      return { 
        success: true, 
        text: lastMessage.text || '', 
        sender: lastMessage.sender || '' 
      };
    } catch (error) {
      return { success: false, error: error.message };
    }
  });

  // 读取所有聊天记录（合并所有历史文件）- 向后兼容
  ipcMain.handle('read-all-chat-history', async (event, workflowFolderPath) => {
    // 向后兼容，重定向到 read-chat-history（使用相同的实现）
    try {
      const absoluteWorkflowPath = getAbsoluteWorkflowPath(workflowFolderPath);
      const historyDir = join(absoluteWorkflowPath, 'history');
      
      // 检查目录是否存在
      try {
        const files = await readdir(historyDir, { withFileTypes: true });
        
        // 过滤出 JSON 文件（chat_*.json）
        const jsonFiles = files
          .filter(file => file.isFile() && file.name.startsWith('chat_') && file.name.endsWith('.json'))
          .map(file => ({
            name: file.name,
            path: join(historyDir, file.name)
          }));

        if (jsonFiles.length === 0) {
          return { success: true, messages: [] }; // 没有文件时返回空数组
        }

        // 获取所有文件的统计信息（修改时间），用于排序
        const filesWithStats = await Promise.all(
          jsonFiles.map(async (file) => {
            const stats = await stat(file.path);
            return {
              ...file,
              mtime: stats.mtime
            };
          })
        );

        // 按修改时间排序（最早的在前，保持时间顺序）
        filesWithStats.sort((a, b) => a.mtime.getTime() - b.mtime.getTime());

        // 读取所有文件并合并消息
        const allMessages = [];
        for (const file of filesWithStats) {
          try {
            const fileContent = await readFile(file.path, 'utf-8');
            const historyData = JSON.parse(fileContent);
            const messages = historyData.messages || [];
            allMessages.push(...messages);
          } catch (error) {
            // 读取聊天记录文件失败，继续处理其他文件
          }
        }

        return { 
          success: true, 
          messages: allMessages,
          fileCount: filesWithStats.length,
          totalMessages: allMessages.length
        };
      } catch (error) {
        // 目录不存在或读取失败
        if (error.code === 'ENOENT') {
          return { success: true, messages: [] }; // 目录不存在时返回空数组
        }
        throw error;
      }
    } catch (error) {
      return { success: false, error: error.message };
    }
  });

  // 读取聊天记录（合并所有历史文件）
  ipcMain.handle('read-chat-history', async (event, workflowFolderPath) => {
    try {
      const absoluteWorkflowPath = getAbsoluteWorkflowPath(workflowFolderPath);
      const historyDir = join(absoluteWorkflowPath, 'history');
      
      // 检查目录是否存在
      try {
        const files = await readdir(historyDir, { withFileTypes: true });
        
        // 过滤出 JSON 文件（chat_*.json）
        const jsonFiles = files
          .filter(file => file.isFile() && file.name.startsWith('chat_') && file.name.endsWith('.json'))
          .map(file => ({
            name: file.name,
            path: join(historyDir, file.name)
          }));

        if (jsonFiles.length === 0) {
          return { success: true, messages: [] }; // 没有文件时返回空数组
        }

        // 获取所有文件的统计信息（修改时间），用于排序
        const filesWithStats = await Promise.all(
          jsonFiles.map(async (file) => {
            const stats = await stat(file.path);
            return {
              ...file,
              mtime: stats.mtime
            };
          })
        );

        // 按修改时间排序（最早的在前，保持时间顺序）
        filesWithStats.sort((a, b) => a.mtime.getTime() - b.mtime.getTime());

        // 读取所有文件并合并消息
        const allMessages = [];
        for (const file of filesWithStats) {
          try {
            const fileContent = await readFile(file.path, 'utf-8');
            const historyData = JSON.parse(fileContent);
            const messages = historyData.messages || [];
            allMessages.push(...messages);
          } catch (error) {
            // 读取聊天记录文件失败，继续处理其他文件
          }
        }

        return { 
          success: true, 
          messages: allMessages,
          fileCount: filesWithStats.length,
          totalMessages: allMessages.length
        };
      } catch (error) {
        // 目录不存在或读取失败
        if (error.code === 'ENOENT') {
          return { success: true, messages: [] }; // 目录不存在时返回空数组
        }
        throw error;
      }
    } catch (error) {
      return { success: false, error: error.message };
    }
  });

  // 提取聊天记录（通过OCR）
  ipcMain.handle('extract-chat-history', async (event, ipPort, friendAvatarPath, myAvatarPath, workflowFolderPath, region = null, friendRgb = null, myRgb = null) => {
    return await extractChatHistory(ipPort, friendAvatarPath, myAvatarPath, workflowFolderPath, region, friendRgb, myRgb);
  });

  // 获取最后一条消息
  ipcMain.handle('get-last-chat-message', async (event, ipPort, friendAvatarPath, myAvatarPath) => {
    return await getLastChatMessage(ipPort, friendAvatarPath, myAvatarPath);
  });

  // OCR 聊天记录（向后兼容，重定向到 extract-chat-history）
  ipcMain.handle('ocr-chat-history', async (event, ipPort, friendAvatarPath, myAvatarPath, workflowFolderPath) => {
    return await extractChatHistory(ipPort, friendAvatarPath, myAvatarPath, workflowFolderPath);
  });
}

/**
 * 提取聊天记录（通过OCR）
 * @param {string} ipPort - 设备 ID/IP:Port
 * @param {string} friendAvatarPath - 好友头像路径
 * @param {string} myAvatarPath - 我的头像路径
 * @param {string} workflowFolderPath - 工作流文件夹路径（可选）
 * @param {Object} region - 识别区域（可选，包含四个顶点坐标的 corners 对象）
 * @param {string} friendRgb - 好友对话框RGB颜色（格式："(r,g,b)"）
 * @param {string} myRgb - 我的对话框RGB颜色（格式："(r,g,b)"）
 * @returns {Promise<{success: boolean, error?: string, messages?: Array}>}
 */
export async function extractChatHistory(ipPort, friendAvatarPath, myAvatarPath, workflowFolderPath = null, region = null, friendRgb = null, myRgb = null) {
  try {
    if (!ipPort) {
      return { success: false, error: '缺少设备 ID' };
    }

    // 1. 获取设备分辨率
    const resolutionResult = await getDeviceResolution(ipPort);
    if (!resolutionResult.success) {
      return { success: false, error: '获取设备分辨率失败' };
    }
    const { width, height } = resolutionResult;

    // 2. 获取屏幕截图
    const screenshotResult = await captureScreenshot(ipPort, { format: 'png' });
    if (!screenshotResult.success || !screenshotResult.data) {
      return { success: false, error: '获取屏幕截图失败' };
    }

    // 3. 保存截图到临时文件（如果提供了工作流文件夹，保存到 tmp/时间戳 目录）
    let screenshotPath;
    let tmpDir = null; // 用于跟踪需要删除的临时目录
    if (workflowFolderPath) {
      // 确保 workflowFolderPath 是绝对路径
      let absoluteWorkflowPath = workflowFolderPath;
      if (!isAbsolute(workflowFolderPath)) {
        // 如果已经是 static/processing/xxx 格式，直接拼接（去掉开头的 static/processing）
        if (workflowFolderPath.startsWith('static/processing/')) {
          const folderName = workflowFolderPath.replace('static/processing/', '');
          absoluteWorkflowPath = join(__dirname, '..', 'static', 'processing', folderName);
        } else if (workflowFolderPath.startsWith('static\\processing\\')) {
          const folderName = workflowFolderPath.replace('static\\processing\\', '');
          absoluteWorkflowPath = join(__dirname, '..', 'static', 'processing', folderName);
        } else {
          // 如果只是文件夹名，需要加上 static/processing
          absoluteWorkflowPath = join(__dirname, '..', 'static', 'processing', workflowFolderPath);
        }
      }
      
      const timestamp = new Date().toISOString().replace(/[:.]/g, '-').slice(0, 19).replace('T', '_');
      tmpDir = join(absoluteWorkflowPath, 'tmp', timestamp);
      await mkdir(tmpDir, { recursive: true });
      screenshotPath = join(tmpDir, 'screenshot.png');
    } else {
      const tempDir = join(__dirname, '..');
      screenshotPath = join(tempDir, 'temp_screenshot_chat.png');
    }
    const screenshotBuffer = Buffer.from(screenshotResult.data, 'base64');
    await writeFile(screenshotPath, screenshotBuffer);
    
    // 验证文件是否成功写入
    try {
      const { access, constants } = await import('fs/promises');
      await access(screenshotPath, constants.F_OK);
      // 截图已保存日志（不显示）
    } catch (err) {
      return { success: false, error: `截图文件写入失败: ${err.message}` };
    }

    try {
      // 4. 调用 JS 函数提取聊天记录
      // 转换头像路径为绝对路径
      let friendAvatarArg = null;
      if (friendAvatarPath) {
        if (isAbsolute(friendAvatarPath)) {
          friendAvatarArg = friendAvatarPath;
        } else {
          friendAvatarArg = join(__dirname, '..', 'static', 'processing', friendAvatarPath);
        }
      }
      
      let myAvatarArg = null;
      if (myAvatarPath) {
        if (isAbsolute(myAvatarPath)) {
          myAvatarArg = myAvatarPath;
        } else {
          myAvatarArg = join(__dirname, '..', 'static', 'processing', myAvatarPath);
        }
      }
      
      // 如果提供了工作流文件夹路径，转换为绝对路径
      let workflowFolderArg = null;
      if (workflowFolderPath) {
        if (isAbsolute(workflowFolderPath)) {
          workflowFolderArg = workflowFolderPath;
        } else {
          if (workflowFolderPath.startsWith('static/processing/')) {
            const folderName = workflowFolderPath.replace('static/processing/', '');
            workflowFolderArg = join(__dirname, '..', 'static', 'processing', folderName);
          } else if (workflowFolderPath.startsWith('static\\processing\\')) {
            const folderName = workflowFolderPath.replace('static\\processing\\', '');
            workflowFolderArg = join(__dirname, '..', 'static', 'processing', folderName);
          } else {
            workflowFolderArg = join(__dirname, '..', 'static', 'processing', workflowFolderPath);
          }
        }
      }
      
      // 传递区域参数（如果提供）
      const regionArg = region ? JSON.stringify(region) : 'None';
      const result = await extractChatHistoryFromFunc(screenshotPath, friendAvatarArg, myAvatarArg, width, height, workflowFolderArg, regionArg, friendRgb, myRgb);
      return result;
    } finally {
      // 5. 使用完后，先判断 tmp 目录总大小是否超过 20MB，再决定是否删除临时目录
      if (tmpDir) {
        try {
          // 获取 tmp 目录的父目录（工作流目录下的 tmp 文件夹）
          const tmpParentDir = dirname(tmpDir);
          
          // 检查 tmp 目录下所有文件和子目录的总大小
          let totalSize = 0;
          const filesToDelete = [];
          
          try {
            const entries = await readdir(tmpParentDir, { withFileTypes: true });
            for (const entry of entries) {
              const entryPath = join(tmpParentDir, entry.name);
              try {
                if (entry.isFile()) {
                  const stats = await stat(entryPath);
                  totalSize += stats.size;
                } else if (entry.isDirectory()) {
                  // 递归计算子目录大小
                  const dirSize = await calculateDirSize(entryPath);
                  totalSize += dirSize;
                  filesToDelete.push({ path: entryPath, size: dirSize, isDir: true });
                }
              } catch (e) {
                // 忽略无法访问的文件
              }
            }
          } catch (e) {
            // 如果无法读取目录，直接删除临时目录
            await rm(tmpDir, { recursive: true, force: true });
            return;
          }
          
          const maxSize = 20 * 1024 * 1024; // 20MB
          
          // 如果总大小超过 20MB，删除时间最早的目录/文件
          if (totalSize > maxSize) {
            // 获取所有目录的修改时间并排序
            const dirsWithTime = [];
            for (const item of filesToDelete) {
              if (item.isDir) {
                try {
                  const stats = await stat(item.path);
                  dirsWithTime.push({ ...item, mtime: stats.mtime });
                } catch (e) {
                  // 忽略无法访问的目录
                }
              }
            }
            
            // 按修改时间排序（最早的在前）
            dirsWithTime.sort((a, b) => a.mtime - b.mtime);
            
            // 删除最早的目录直到总大小小于 20MB
            for (const dirInfo of dirsWithTime) {
              if (totalSize <= maxSize) {
                break;
              }
              try {
                await rm(dirInfo.path, { recursive: true, force: true });
                totalSize -= dirInfo.size;
              } catch (e) {
                // 忽略删除失败
              }
            }
          }
          
          // 如果临时目录仍然存在且总大小未超过限制，也删除它（保持原有行为）
          try {
            const tmpDirExists = await stat(tmpDir).then(() => true).catch(() => false);
            if (tmpDirExists) {
              await rm(tmpDir, { recursive: true, force: true });
            }
          } catch (rmError) {
            // 忽略删除失败
          }
        } catch (error) {
          // 清理失败不影响主流程
        }
      }
    }
  } catch (error) {
    if (error.message && error.message.includes('timeout')) {
      return { success: false, error: '提取聊天记录超时，请检查网络连接或稍后重试' };
    }
    return { success: false, error: error.message };
  }
}

/**
 * 获取最后一条消息（带发送者信息）
 * @param {string} ipPort - 设备 ID/IP:Port
 * @param {string} friendAvatarPath - 好友头像路径
 * @param {string} myAvatarPath - 我的头像路径
 * @returns {Promise<{success: boolean, error?: string, text?: string, sender?: string}>}
 */
export async function getLastChatMessage(ipPort, friendAvatarPath, myAvatarPath) {
  try {
    if (!ipPort) {
      return { success: false, error: '缺少设备 ID' };
    }

    // 1. 获取设备分辨率
    const resolutionResult = await getDeviceResolution(ipPort);
    if (!resolutionResult.success) {
      return { success: false, error: '获取设备分辨率失败' };
    }
    const { width, height } = resolutionResult;

    // 2. 获取屏幕截图
    const screenshotResult = await captureScreenshot(ipPort, { format: 'png' });
    if (!screenshotResult.success || !screenshotResult.data) {
      return { success: false, error: '获取屏幕截图失败' };
    }

    // 3. 保存截图到临时文件
    const tempDir = join(__dirname, '..');
    const screenshotPath = join(tempDir, 'temp_screenshot_chat.png');
    const screenshotBuffer = Buffer.from(screenshotResult.data, 'base64');
    await writeFile(screenshotPath, screenshotBuffer);

    // 4. 调用 JS 实现获取最后一条消息
    // 转换头像路径为绝对路径
    let friendAvatarArg = null;
    if (friendAvatarPath) {
      if (isAbsolute(friendAvatarPath)) {
        friendAvatarArg = friendAvatarPath;
      } else {
        friendAvatarArg = join(__dirname, '..', 'static', 'processing', friendAvatarPath);
      }
    }
    
    let myAvatarArg = null;
    if (myAvatarPath) {
      if (isAbsolute(myAvatarPath)) {
        myAvatarArg = myAvatarPath;
      } else {
        myAvatarArg = join(__dirname, '..', 'static', 'processing', myAvatarPath);
      }
    }
    
    const normalizedScreenshotPath = screenshotPath.replace(/\\/g, '/');
    const normalizedFriendAvatar = friendAvatarArg ? friendAvatarArg.replace(/\\/g, '/') : null;
    const normalizedMyAvatar = myAvatarArg ? myAvatarArg.replace(/\\/g, '/') : null;
    
    const result = await getLastMessageFromFunc(normalizedScreenshotPath, normalizedFriendAvatar, normalizedMyAvatar, width, height);
    
    if (result.success) {
    }
    
    return result;
  } catch (error) {
    if (error.message && error.message.includes('timeout')) {
      return { success: false, error: '获取最后一条消息超时，请检查网络连接或稍后重试' };
    }
    return { success: false, error: error.message };
  }
}