# All files / services WhatsAppService.js

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     /**
     * WhatsAppService.js
     *
     * Multi-tenant WhatsApp service manager
     * Manages separate WhatsApp connections for each tenant
     * Based on Baileys 6.5.0
     *
     * @module services/WhatsAppService
     */

    const path = require('path');
    const fs = require('fs').promises;
    const { logger } = require('../config/logger');
    const { pool } = require('../config/database');
    const BillingService = require('./BillingService');

    // WhatsApp modules (will be loaded per tenant)
    const WhatsAppConnection = require('./whatsapp/WhatsAppConnection');
    const WhatsAppMessageHandler = require('./whatsapp/WhatsAppMessageHandler');
    const WhatsAppMediaHandler = require('./whatsapp/WhatsAppMediaHandler');
    const WhatsAppQRHandler = require('./whatsapp/WhatsAppQRHandler');
    const WhatsAppStateManager = require('./whatsapp/WhatsAppStateManager');

    /**
     * Multi-tenant WhatsApp Service
     * Manages separate WhatsApp instances for each tenant
     */
    class WhatsAppService {
      constructor(io) {
        this.io = io;
        this.tenantInstances = new Map(); // tenantId => WhatsAppInstance
        this.sessionsPath = path.join(__dirname, '../sessions');
        this.uploadsPath = path.join(__dirname, '../uploads');
        this.rateLimits = new Map(); // key: `${tenantId}:${phone}` -> { lastSentAt, windowStart, windowCount }
      }

      /**
       * Initialize WhatsApp service for a tenant
       * @param {number} tenantId - Tenant ID
       * @param {Object} options - Configuration options
       * @returns {Promise<Object>} Instance details
       */
      async initializeTenant(tenantId, options = {}) {
        try {
          // Check if tenant already has an instance
          if (this.tenantInstances.has(tenantId)) {
            const existingInstance = this.tenantInstances.get(tenantId);
            const isConnected = existingInstance.connection.isConnected(tenantId);

            logger.info(`Tenant ${tenantId} already has WhatsApp instance`, { isConnected });

            // If already connected, return the instance
            if (isConnected) {
              return existingInstance;
            }

            // If not connected, try to initialize again
            logger.info(`Tenant ${tenantId} instance exists but not connected, reinitializing...`);
            const tenantState = existingInstance.connection.getTenantState(tenantId);
            const eventHandlers = tenantState ? tenantState.eventHandlers : {};
            await existingInstance.connection.initialize(tenantId, eventHandlers);

            return existingInstance;
          }

          let tenant;

          // Special case: tenant 0 is superadmin (system notifications)
          if (tenantId === 0) {
            tenant = {
              id: 0,
              name: 'Superadmin',
              subdomain: 'superadmin',
              status: 'active'
            };
            logger.info('Initializing WhatsApp for superadmin notifications (tenant 0)');
          } else {
            // Verify tenant exists and is active
            const connection = await pool.getConnection();
            const [tenants] = await connection.query(
              'SELECT * FROM tenants WHERE id = ? AND status = ?',
              [tenantId, 'active']
            );
            connection.release();

            if (!tenants.length) {
              throw new Error('Tenant not found or inactive');
            }

            tenant = tenants[0];
          }

          // Create tenant-specific paths
          const tenantSessionPath = path.join(this.sessionsPath, `tenant_${tenantId}`);
          const tenantUploadPath = path.join(this.uploadsPath, `tenant_${tenantId}`);

          // Ensure directories exist (parallel for speed)
          await Promise.all([
            fs.mkdir(tenantSessionPath, { recursive: true }),
            fs.mkdir(tenantUploadPath, { recursive: true })
          ]);

          // Create tenant-specific Socket.IO namespace
          const tenantNamespace = this.io.of(`/tenant/${tenantId}`);

          // Initialize WhatsApp modules for this tenant
          const stateManager = new WhatsAppStateManager(tenantSessionPath);
          const qrHandler = new WhatsAppQRHandler(tenantNamespace, {
            maxQrGenerations: 3,
            qrTimeoutDuration: 60000
          });
          const mediaHandler = new WhatsAppMediaHandler({
            uploadPath: tenantUploadPath,
            maxFileSize: 50 * 1024 * 1024
          });
          const whatsappConnection = new WhatsAppConnection(
            tenantNamespace,
            stateManager,
            qrHandler,
            { maxReconnectAttempts: 5 }
          );
          // CRITICAL FIX: Pass main io object, not namespace
          const messageHandler = new WhatsAppMessageHandler(
            this.io,
            mediaHandler,
            { enableOpenAI: options.enableOpenAI || false, tenantId }
          );

          // Create instance object
          const instance = {
            tenantId,
            tenant,
            connection: whatsappConnection,
            messageHandler,
            mediaHandler,
            qrHandler,
            stateManager,
            namespace: tenantNamespace,
            isConnected: false,
            createdAt: new Date()
          };

          // Setup message handler
          const onMessageHandler = async (m) => {
            try {
              // Check usage limits before processing
              const withinLimits = await BillingService.checkUsageLimits(tenantId);

              if (!withinLimits) {
                logger.warn(`Tenant ${tenantId} exceeded usage limits`);
                tenantNamespace.emit('usage-limit-exceeded', {
                  message: 'Monthly message limit exceeded'
                });
                return;
              }

              const sock = whatsappConnection.getSocket(tenantId);
              const downloadMediaMessage = whatsappConnection.getDownloadMediaMessage();

              console.log(`📞 [WhatsAppService] Calling messageHandler.handleMessage for tenant ${tenantId}`);
              await messageHandler.handleMessage(tenantId, m, sock, downloadMediaMessage);

              // Track usage
              await BillingService.trackMessageUsage(tenantId, 1);
            } catch (error) {
              logger.error(`Error handling message for tenant ${tenantId}:`, error);
            }
          };

          // Initialize connection - PASS tenantId as first parameter
          await whatsappConnection.initialize(tenantId, {
            onMessage: onMessageHandler
          });

          // Store instance
          this.tenantInstances.set(tenantId, instance);

          logger.info(`WhatsApp initialized for tenant ${tenantId}`);

          return instance;
        } catch (error) {
          logger.error(`Error initializing WhatsApp for tenant ${tenantId}:`, error);
          throw error;
        }
      }

      /**
       * Get WhatsApp instance for a tenant
       * @param {number} tenantId - Tenant ID
       * @returns {Object|null} WhatsApp instance
       */
      getInstance(tenantId) {
        return this.tenantInstances.get(tenantId) || null;
      }

      /**
       * Send message for a tenant
       * @param {number} tenantId - Tenant ID
       * @param {string} phoneNumber - Recipient phone number
       * @param {string} messageText - Message text
       * @param {number} conversationId - Conversation ID (optional)
       * @returns {Promise<Object>} Send result
       */
      async sendMessage(tenantId, phoneNumber, messageText, conversationId = null) {
        try {
          logger.info(`[WhatsAppService.sendMessage] Called`, { tenantId, phoneNumber, messageLength: messageText.length });

          // Check usage limits
          const withinLimits = await BillingService.checkUsageLimits(tenantId);

          logger.info(`[WhatsAppService.sendMessage] Usage limits check`, { tenantId, withinLimits });

          if (!withinLimits) {
            return {
              success: false,
              error: 'Monthly message limit exceeded'
            };
          }

          const instance = this.getInstance(tenantId);

          logger.info(`[WhatsAppService.sendMessage] Instance check`, { tenantId, hasInstance: !!instance });

          if (!instance) {
            return {
              success: false,
              error: 'WhatsApp not initialized for this tenant'
            };
          }

          const sock = instance.connection.getSocket(tenantId);
          const isConnected = instance.connection.isConnected(tenantId);

          logger.info(`[WhatsAppService.sendMessage] Connection check`, {
            tenantId,
            hasSock: !!sock,
            isConnected,
            sockUser: sock?.user?.id,
            sockAuthState: sock?.authState?.creds?.me?.id
          });

          if (!sock || !isConnected) {
            try {
              logger.info(`[WhatsAppService.sendMessage] Attempting reconnect`, { tenantId });
              await instance.connection.reconnect(tenantId);
              const wait = async (ms) => new Promise(r => setTimeout(r, ms));
              await wait(1500);
            } catch (reconnectError) {
              logger.warn(`[WhatsAppService.sendMessage] Reconnect attempt failed`, { tenantId, error: reconnectError.message });
            }
            const sockAfter = instance.connection.getSocket(tenantId);
            const connectedAfter = instance.connection.isConnected(tenantId);
            if (!sockAfter || !connectedAfter) {
              return {
                success: false,
                error: 'WhatsApp not connected'
              };
            }
          }

          // Anti-ban: strict per-contact rate limit and human-like jitter
          const local = phoneNumber.includes('@') ? phoneNumber.split('@')[0] : phoneNumber.replace(/^\+/, '');
          const rateKey = `${tenantId}:${local}`;
          const now = Date.now();
          const minIntervalMs = 4000;       // min 4s between messages to same contact
          const windowMs = 60000;           // 1 minute window
          const limitPerWindow = 15;        // max 15 messages per minute to same contact
          const state = this.rateLimits.get(rateKey) || { lastSentAt: 0, windowStart: now, windowCount: 0 };
          const inWindow = now - state.windowStart < windowMs;
          const countOk = inWindow ? state.windowCount < limitPerWindow : true;
          const intervalOk = now - state.lastSentAt >= minIntervalMs;
          if (!countOk || !intervalOk) {
            const retryAfterMs = intervalOk ? (state.windowStart + windowMs - now) : (minIntervalMs - (now - state.lastSentAt));
            logger.warn(`[WhatsAppService.sendMessage] Rate limited`, { tenantId, local, retryAfterMs });
            return { success: false, error: 'Rate limited. Retry later.' };
          }
          // Update rate state pre-send to serialize multiple sends
          if (!inWindow) {
            state.windowStart = now;
            state.windowCount = 0;
          }
          state.lastSentAt = now;
          state.windowCount += 1;
          this.rateLimits.set(rateKey, state);
          // Human-like jitter
          const jitterMs = 800 + Math.floor(Math.random() * 1400);
          await new Promise(r => setTimeout(r, jitterMs));

          // If phoneNumber already contains @, use it as JID directly (it's a remoteJid)
          // Otherwise, format it as a WhatsApp JID
          // CRITICAL FIX: Handle @lid format - WhatsApp may need @s.whatsapp.net for sending
          let jid;
          if (phoneNumber.includes('@')) {
            const local = phoneNumber.split('@')[0];
            if (phoneNumber.includes('@lid')) {
              jid = `${local}@s.whatsapp.net`;
            } else {
              jid = phoneNumber;
            }
            logger.info(`[WhatsAppService.sendMessage] Using JID format`, {
              tenantId,
              originalPhone: phoneNumber,
              jid,
              isLid: phoneNumber.includes('@lid'),
              isWhatsappNet: phoneNumber.includes('@s.whatsapp.net')
            });
          } else {
            const cleanPhone = phoneNumber.replace(/^\+/, '');
            jid = `${cleanPhone}@s.whatsapp.net`;
          }

          logger.info(`[WhatsAppService.sendMessage] Sending to JID`, {
            tenantId,
            originalPhone: phoneNumber,
            jid,
            messageLength: messageText.length
          });

          let sentMessageResult;
          try {
            // CRITICAL FIX: Try without timeout first to see if it completes
            logger.info(`[WhatsAppService.sendMessage] Calling sock.sendMessage...`, { tenantId, jid });

            sentMessageResult = await sock.sendMessage(jid, { text: messageText });

            logger.info(`[WhatsAppService.sendMessage] sock.sendMessage completed`, {
              tenantId,
              jid,
              result: sentMessageResult ? 'success' : 'no result',
              messageId: sentMessageResult?.key?.id
            });
          } catch (sendError) {
            logger.error(`[WhatsAppService.sendMessage] sock.sendMessage failed`, {
              tenantId,
              jid,
              error: sendError.message,
              errorCode: sendError.code,
              stack: sendError.stack
            });
            return {
              success: false,
              error: `Failed to send WhatsApp message: ${sendError.message}`
            };
          }

          logger.info(`[WhatsAppService.sendMessage] Message sent successfully`, { tenantId, jid });

          // Save outgoing message with WhatsApp message ID for edit/delete support
          if (conversationId) {
            await instance.messageHandler.saveOutgoingMessage(
              tenantId,
              phoneNumber.replace('@s.whatsapp.net', '').replace('@lid', ''),
              messageText,
              {
                messageType: 'text',
                conversationId: conversationId,
                whatsappMessageId: sentMessageResult?.key?.id || null
              }
            );
          }

          // Track usage
          await BillingService.trackMessageUsage(tenantId, 1);

          logger.info(`Message sent for tenant ${tenantId} to ${phoneNumber}`);

          // CRITICAL FIX: Emit real-time update to tenant namespace
          const tenantNamespace = this.io.of(`/tenant/${tenantId}`);
          tenantNamespace.emit('message-sent', {
            conversationId: conversationId,
            phoneNumber: phoneNumber.replace('@s.whatsapp.net', '').replace('@lid', ''),
            message: messageText,
            timestamp: new Date()
          });

          // Return success with WhatsApp message ID for edit/delete support
          return {
            success: true,
            whatsappMessageId: sentMessageResult?.key?.id || null
          };
        } catch (error) {
          logger.error(`[WhatsAppService.sendMessage] Error sending message for tenant ${tenantId}:`, error);
          return { success: false, error: error.message };
        }
      }

      /**
       * Send media message for a tenant
       * @param {number} tenantId - Tenant ID
       * @param {string} phoneNumber - Recipient phone number
       * @param {string} filePathOrUrl - Media file path or URL (can be /uploads/filename or full path)
       * @param {string} caption - Media caption
       * @param {number} conversationId - Conversation ID (optional)
       * @returns {Promise<Object>} Send result
       */
      async sendMediaMessage(tenantId, phoneNumber, filePathOrUrl, caption = '', conversationId = null) {
        try {
          logger.info(`[sendMediaMessage] Starting for tenant ${tenantId}`, { phoneNumber, filePathOrUrl, caption });

          // Check usage limits
          const withinLimits = await BillingService.checkUsageLimits(tenantId);

          if (!withinLimits) {
            return {
              success: false,
              error: 'Monthly message limit exceeded'
            };
          }

          const instance = this.getInstance(tenantId);

          if (!instance) {
            return {
              success: false,
              error: 'WhatsApp not initialized for this tenant'
            };
          }

          const sock = instance.connection.getSocket(tenantId);

          if (!sock || !instance.connection.isConnected(tenantId)) {
            return {
              success: false,
              error: 'WhatsApp not connected'
            };
          }

          // Anti-ban: rate-limit and jitter for media too
          const local = phoneNumber.includes('@') ? phoneNumber.split('@')[0] : phoneNumber.replace(/^\+/, '');
          const rateKey = `${tenantId}:${local}`;
          const now = Date.now();
          const minIntervalMs = 5000;       // stricter interval for media
          const windowMs = 60000;
          const limitPerWindow = 10;        // lower limit for media
          const state = this.rateLimits.get(rateKey) || { lastSentAt: 0, windowStart: now, windowCount: 0 };
          const inWindow = now - state.windowStart < windowMs;
          const countOk = inWindow ? state.windowCount < limitPerWindow : true;
          const intervalOk = now - state.lastSentAt >= minIntervalMs;
          if (!countOk || !intervalOk) {
            const retryAfterMs = intervalOk ? (state.windowStart + windowMs - now) : (minIntervalMs - (now - state.lastSentAt));
            logger.warn(`[WhatsAppService.sendMediaMessage] Rate limited`, { tenantId, local, retryAfterMs });
            return { success: false, error: 'Rate limited. Retry later.' };
          }
          if (!inWindow) {
            state.windowStart = now;
            state.windowCount = 0;
          }
          state.lastSentAt = now;
          state.windowCount += 1;
          this.rateLimits.set(rateKey, state);
          const jitterMs = 1200 + Math.floor(Math.random() * 1800);
          await new Promise(r => setTimeout(r, jitterMs));

          // CRITICAL FIX: Convert URL path to actual file path
          let actualFilePath = filePathOrUrl;

          // If it's a URL path like /uploads/filename, convert to actual file path
          if (filePathOrUrl.startsWith('/uploads/')) {
            actualFilePath = path.join(__dirname, '..', filePathOrUrl);
            logger.info(`[sendMediaMessage] Converted URL to path: ${actualFilePath}`);
          } else if (!path.isAbsolute(filePathOrUrl)) {
            // If it's a relative path, make it absolute from project root
            actualFilePath = path.join(__dirname, '..', filePathOrUrl);
            logger.info(`[sendMediaMessage] Made path absolute: ${actualFilePath}`);
          }

          // Check if file exists
          const fsSync = require('fs');
          if (!fsSync.existsSync(actualFilePath)) {
            logger.error(`[sendMediaMessage] File not found: ${actualFilePath}`);
            return { success: false, error: `File not found: ${actualFilePath}` };
          }

          const media = await instance.mediaHandler.uploadMedia(tenantId, actualFilePath);

          if (!media) {
            logger.error(`[sendMediaMessage] Error uploading media for tenant ${tenantId}`);
            return { success: false, error: 'Error uploading media' };
          }

          const jid = phoneNumber.includes('@') ? phoneNumber : `${phoneNumber}@s.whatsapp.net`;

          // CRITICAL FIX: Build message with proper mimetype and filename for documents
          const message = {};

          // Get original filename for documents
          const originalFilename = path.basename(actualFilePath);

          if (media.messageType === 'image') {
            message.image = media.buffer;
            message.mimetype = media.mimeType;
            if (caption) message.caption = caption;
          } else if (media.messageType === 'video') {
            message.video = media.buffer;
            message.mimetype = media.mimeType;
            if (caption) message.caption = caption;
          } else if (media.messageType === 'audio') {
            message.audio = media.buffer;
            message.mimetype = media.mimeType;
            // Voice note (ptt) for ogg, webm, or mp4 audio
            message.ptt = media.mimeType.includes('ogg') ||
                          media.mimeType.includes('webm') ||
                          media.mimeType.includes('opus');
          } else {
            // Document - CRITICAL: Include mimetype and filename
            message.document = media.buffer;
            message.mimetype = media.mimeType;
            message.fileName = originalFilename;
            if (caption) message.caption = caption;
          }

          logger.info(`[sendMediaMessage] Sending ${media.messageType} with mimetype: ${media.mimeType}, filename: ${originalFilename}`);

          const sentMediaResult = await sock.sendMessage(jid, message);

          // Save outgoing message with WhatsApp message ID for edit/delete support
          if (conversationId) {
            await instance.messageHandler.saveOutgoingMessage(
              tenantId,
              phoneNumber.replace('@s.whatsapp.net', '').replace('@lid', ''),
              caption || '[Media]',
              {
                messageType: media.messageType,
                mediaUrl: filePathOrUrl,
                conversationId: conversationId,
                whatsappMessageId: sentMediaResult?.key?.id || null
              }
            );
          }

          // Track usage
          await BillingService.trackMessageUsage(tenantId, 1);

          // Emit real-time update
          const tenantNamespace = this.io.of(`/tenant/${tenantId}`);
          tenantNamespace.emit('message-sent', {
            conversationId: conversationId,
            phoneNumber: phoneNumber.replace('@s.whatsapp.net', '').replace('@lid', ''),
            message: caption || '[Media]',
            mediaUrl: filePathOrUrl,
            mediaType: media.messageType,
            timestamp: new Date()
          });

          logger.info(`Media message sent for tenant ${tenantId}`);

          // Return success with WhatsApp message ID for edit/delete support
          return {
            success: true,
            whatsappMessageId: sentMediaResult?.key?.id || null
          };
        } catch (error) {
          logger.error(`Error sending media for tenant ${tenantId}:`, error);
          return { success: false, error: error.message };
        }
      }

      /**
       * Get connection status for a tenant
       * @param {number} tenantId - Tenant ID
       * @returns {Object} Connection status
       */
      getStatus(tenantId) {
        const instance = this.getInstance(tenantId);

        if (!instance) {
          return {
            connected: false,
            initialized: false,
            error: 'Not initialized'
          };
        }

        const connStatus = instance.connection.getStatus(tenantId);
        const sessionInfo = instance.stateManager.getSessionInfo(tenantId);

        return {
          ...connStatus,
          session: sessionInfo,
          phoneNumber: this.getPhoneNumber(tenantId),
          initialized: true
        };
      }

      /**
       * Get connected phone number for a tenant
       * @param {number} tenantId - Tenant ID
       * @returns {string|null} Phone number
       */
      getPhoneNumber(tenantId) {
        try {
          const instance = this.getInstance(tenantId);

          if (!instance) return null;

          const sock = instance.connection.getSocket(tenantId);

          if (!sock || !instance.connection.isConnected(tenantId)) {
            return null;
          }

          const user = sock.user;
          return user?.id ? user.id.split(':')[0] : null;
        } catch (error) {
          return null;
        }
      }

      async getWebConversations(tenantId) {
        try {
          const normalizedTenantId = Number(tenantId);
          logger.info('Web conversations fetch start', { tenantId: normalizedTenantId });
          let instance = this.getInstance(normalizedTenantId);
          if (!instance) {
            await this.initializeTenant(normalizedTenantId);
            instance = this.getInstance(normalizedTenantId);
          } else if (!instance.connection.isConnected(normalizedTenantId)) {
            await this.initializeTenant(normalizedTenantId);
          }

          if (!instance) {
            return [];
          }

          const waitFor = async (condition, timeoutMs, intervalMs) => {
            const start = Date.now();
            while (Date.now() - start < timeoutMs) {
              if (await condition()) return true;
              await new Promise(resolve => setTimeout(resolve, intervalMs));
            }
            return false;
          };

          if (!instance.connection.isConnected(normalizedTenantId)) {
            await waitFor(() => instance.connection.isConnected(normalizedTenantId), 10000, 500);
          }

          let chats = await instance.connection.getChats(normalizedTenantId);
          if (!chats.length && instance.connection.isConnected(normalizedTenantId)) {
            await instance.connection.forceHistorySync(normalizedTenantId);
            await waitFor(async () => {
              const nextChats = await instance.connection.getChats(normalizedTenantId);
              if (nextChats.length) {
                chats = nextChats;
                return true;
              }
              return false;
            }, 30000, 1000);
          }
          if (!chats.length && instance.connection.isConnected(normalizedTenantId)) {
            await instance.connection.reconnect(normalizedTenantId);
            await waitFor(() => instance.connection.isConnected(normalizedTenantId), 15000, 500);
            await waitFor(async () => {
              const nextChats = await instance.connection.getChats(normalizedTenantId);
              if (nextChats.length) {
                chats = nextChats;
                return true;
              }
              return false;
            }, 20000, 1000);
          }
          logger.info('Web conversations fetch result', {
            tenantId: normalizedTenantId,
            connected: instance.connection.isConnected(normalizedTenantId),
            chatsCount: chats.length,
            storeStats: instance.connection.getStoreStats?.(normalizedTenantId) || null
          });
          const filteredChats = chats.filter(chat => {
            const rawId = chat?.id?.id || chat?.id || chat?.jid || chat?.remoteJid || chat?.key?.remoteJid;
            if (!rawId) return false;
            const chatId = typeof rawId === 'string' ? rawId : String(rawId);
            return Boolean(chatId) && chatId.includes('@');
          });

          return filteredChats.map(chat => {
            const rawId = chat?.id?.id || chat?.id || chat?.jid || chat?.remoteJid || chat?.key?.remoteJid || '';
            const chatId = typeof rawId === 'string' ? rawId : String(rawId);
            const displayName = chat?.name || chat?.pushName || chat?.subject || (chatId ? chatId.split('@')[0] : 'Unknown');
            const phone = chatId ? chatId.split('@')[0] : '';
            const lastMessageText = chat?.lastMessage?.message?.conversation
              || chat?.lastMessage?.message?.extendedTextMessage?.text
              || chat?.lastMessage?.message?.imageMessage?.caption
              || chat?.lastMessage?.message?.videoMessage?.caption
              || '';
            const lastTimestamp = chat?.lastMessage?.messageTimestamp
              ? chat.lastMessage.messageTimestamp * 1000
              : (chat?.conversationTimestamp ? chat.conversationTimestamp * 1000 : 0);

            return {
              id: chatId,
              name: displayName,
              phone,
              avatar: null,
              lastMessage: lastMessageText,
              timestamp: lastTimestamp,
              stageId: 'new',
              tags: [],
              unreadCount: chat?.unreadCount || 0,
              conversationId: chatId,
              source: 'whatsapp_web'
            };
          });
        } catch (error) {
          logger.error('Error fetching Web WhatsApp conversations for tenant', {
            tenantId,
            error: error.message
          });
          return [];
        }
      }

      async forceWebSync(tenantId) {
        const normalizedTenantId = Number(tenantId);
        logger.info('Force web sync start', { tenantId: normalizedTenantId });
        let instance = this.getInstance(normalizedTenantId);
        if (!instance) {
          await this.initializeTenant(normalizedTenantId);
          instance = this.getInstance(normalizedTenantId);
        }
        if (!instance) return false;
        await instance.connection.forceHistorySync(normalizedTenantId);
        let chats = await instance.connection.getChats(normalizedTenantId);
        if (!chats.length) {
          await instance.connection.reconnect(normalizedTenantId);
          const waitFor = async (condition, timeoutMs, intervalMs) => {
            const start = Date.now();
            while (Date.now() - start < timeoutMs) {
              if (await condition()) return true;
              await new Promise(resolve => setTimeout(resolve, intervalMs));
            }
            return false;
          };
          await waitFor(() => instance.connection.isConnected(normalizedTenantId), 15000, 500);
          await waitFor(async () => {
            const nextChats = await instance.connection.getChats(normalizedTenantId);
            if (nextChats.length) {
              chats = nextChats;
              return true;
            }
            return false;
          }, 20000, 1000);
        }
        logger.info('Force web sync result', {
          tenantId: normalizedTenantId,
          connected: instance.connection.isConnected(normalizedTenantId),
          chatsCount: chats.length,
          storeStats: instance.connection.getStoreStats?.(normalizedTenantId) || null
        });
        return true;
      }

      /**
       * Disconnect WhatsApp for a tenant
       * @param {number} tenantId - Tenant ID
       * @returns {Promise<boolean>} Success status
       */
      async disconnect(tenantId) {
        try {
          const instance = this.getInstance(tenantId);

          if (!instance) {
            return false;
          }

          await instance.connection.disconnect(tenantId);

          // Remove instance
          this.tenantInstances.delete(tenantId);

          logger.info(`WhatsApp disconnected for tenant ${tenantId}`);

          return true;
        } catch (error) {
          logger.error(`Error disconnecting tenant ${tenantId}:`, error);
          return false;
        }
      }

      /**
       * Reconnect WhatsApp for a tenant
       * @param {number} tenantId - Tenant ID
       * @returns {Promise<boolean>} Success status
       */
      async reconnect(tenantId) {
        try {
          const instance = this.getInstance(tenantId);

          if (!instance) {
            // Initialize if not exists
            await this.initializeTenant(tenantId);
            return true;
          }

          await instance.connection.reconnect(tenantId);

          logger.info(`WhatsApp reconnection initiated for tenant ${tenantId}`);

          return true;
        } catch (error) {
          logger.error(`Error reconnecting tenant ${tenantId}:`, error);
          return false;
        }
      }

      /**
       * Clear session for a tenant
       * @param {number} tenantId - Tenant ID
       * @returns {Promise<boolean>} Success status
       */
      async clearSession(tenantId) {
        try {
          logger.info(`Clearing session for tenant ${tenantId}`);

          const instance = this.getInstance(tenantId);

          if (!instance) {
            logger.warn(`No instance found for tenant ${tenantId}`);
            return false;
          }

          // Disconnect first
          await instance.connection.disconnect(tenantId);

          // Backup before clearing
          instance.stateManager.backupSession(tenantId);

          // Clear session files
          const cleared = instance.stateManager.clearSession(tenantId);

          if (cleared) {
            instance.qrHandler.resetCounter(tenantId);
            instance.qrHandler.clearQR(tenantId);

            // Remove instance from map to force recreation
            this.tenantInstances.delete(tenantId);

            logger.info(`Session cleared and instance removed for tenant ${tenantId}`);
            return true;
          }

          return false;
        } catch (error) {
          logger.error(`Error clearing session for tenant ${tenantId}:`, error);
          return false;
        }
      }

      /**
       * Get QR code for a tenant
       * @param {number} tenantId - Tenant ID
       * @returns {string|null} QR code
       */
      getQRCode(tenantId) {
        const instance = this.getInstance(tenantId);
        return instance ? instance.qrHandler.getCurrentQR(tenantId) : null;
      }

      /**
       * Get all active tenant instances
       * @returns {Array} List of active tenants
       */
      getActiveTenants() {
        return Array.from(this.tenantInstances.keys());
      }

      /**
       * Disconnect all tenants (for shutdown)
       * @returns {Promise<void>}
       */
      async disconnectAll() {
        logger.info('Disconnecting all tenant WhatsApp instances');

        const disconnectPromises = Array.from(this.tenantInstances.keys()).map(
          tenantId => this.disconnect(tenantId)
        );

        await Promise.all(disconnectPromises);

        logger.info('All tenant instances disconnected');
      }

      /**
       * Clean old media for a tenant
       * @param {number} tenantId - Tenant ID
       * @param {number} daysToKeep - Days to keep media
       * @returns {Promise<number>} Number of files cleaned
       */
      async cleanOldMedia(tenantId, daysToKeep = 30) {
        try {
          const instance = this.getInstance(tenantId);

          if (!instance) {
            return 0;
          }

          const cleaned = instance.mediaHandler.cleanOldMedia(daysToKeep);
          logger.info(`Old media cleaned for tenant ${tenantId}:`, { cleaned });

          return cleaned;
        } catch (error) {
          logger.error(`Error cleaning media for tenant ${tenantId}:`, error);
          return 0;
        }
      }

      /**
       * Clean old backups for a tenant
       * @param {number} tenantId - Tenant ID
       * @param {number} daysToKeep - Days to keep backups
       * @returns {Promise<number>} Number of backups cleaned
       */
      async cleanOldBackups(tenantId, daysToKeep = 7) {
        try {
          const instance = this.getInstance(tenantId);

          if (!instance) {
            return 0;
          }

          const cleaned = instance.stateManager.cleanOldBackups(daysToKeep);
          logger.info(`Old backups cleaned for tenant ${tenantId}:`, { cleaned });

          return cleaned;
        } catch (error) {
          logger.error(`Error cleaning backups for tenant ${tenantId}:`, error);
          return 0;
        }
      }

      /**
       * Get tenant status (wrapper for Controller)
       * @param {number} tenantId - Tenant ID
       * @returns {Promise<Object>} Status object
       */
      async getTenantStatus(tenantId) {
        try {
          logger.info('Getting tenant status', { tenantId });

          const status = this.getStatus(tenantId);
          logger.info('Status retrieved', { tenantId, status });

          // Get QR code if connecting
          let qrCode = null;
          const instance = this.getInstance(tenantId);

          if (instance && instance.qrHandler) {
            qrCode = instance.qrHandler.getCurrentQR(tenantId);
            logger.info('QR code retrieved from handler', {
              tenantId,
              hasQR: !!qrCode,
              qrLength: qrCode ? qrCode.length : 0,
              qrPreview: qrCode ? qrCode.substring(0, 50) + '...' : null
            });
          } else {
            logger.warn('No instance or qrHandler found', {
              tenantId,
              hasInstance: !!instance,
              hasQRHandler: instance ? !!instance.qrHandler : false
            });
          }

          const result = {
            status: status.connected ? 'connected' : (status.initialized ? 'connecting' : 'disconnected'),
            phoneNumber: status.phoneNumber,
            qr: qrCode,
            ...status
          };

          logger.info('Returning tenant status', {
            tenantId,
            statusValue: result.status,
            hasQR: !!result.qr,
            qrLength: result.qr ? result.qr.length : 0,
            connected: status.connected,
            initialized: status.initialized
          });

          return result;
        } catch (error) {
          logger.error(`Error getting tenant status: ${error.message}`, { tenantId, stack: error.stack });
          return {
            status: 'disconnected',
            error: error.message
          };
        }
      }

      /**
       * Get current QR code for tenant
       * @param {number} tenantId - Tenant ID
       * @returns {Promise<string|null>} QR code data URL
       */
      async getQRCode(tenantId) {
        try {
          const instance = this.getInstance(tenantId);

          if (!instance || !instance.qrHandler) {
            return null;
          }

          return instance.qrHandler.getCurrentQR(tenantId);
        } catch (error) {
          logger.error(`Error getting QR code: ${error.message}`, { tenantId });
          return null;
        }
      }

      /**
       * Disconnect tenant (wrapper for Controller)
       * @param {number} tenantId - Tenant ID
       * @returns {Promise<boolean>} Success status
       */
      async disconnectTenant(tenantId) {
        return await this.disconnect(tenantId);
      }

      /**
       * Clear tenant session (wrapper for Controller)
       * @param {number} tenantId - Tenant ID
       * @returns {Promise<boolean>} Success status
       */
      async clearTenantSession(tenantId) {
        return await this.clearSession(tenantId);
      }

      /**
       * Get messages for tenant
       * @param {number} tenantId - Tenant ID
       * @param {Object} options - Query options
       * @returns {Promise<Object>} Messages data
       */
      async getMessages(tenantId, options = {}) {
        try {
          const { limit = 50, offset = 0, phoneNumber } = options;

          const WhatsAppMessage = require('../models/WhatsAppMessage');

          let query = `
            SELECT * FROM whatsapp_messages
            WHERE tenant_id = ?
          `;
          const params = [tenantId];

          if (phoneNumber) {
            query += ` AND phone_number = ?`;
            params.push(phoneNumber);
          }

          query += ` ORDER BY created_at DESC LIMIT ? OFFSET ?`;
          params.push(limit, offset);

          const [messages] = await pool.query(query, params);

          return {
            messages,
            total: messages.length,
            limit,
            offset
          };
        } catch (error) {
          logger.error(`Error getting messages: ${error.message}`, { tenantId });
          throw error;
        }
      }

      /**
       * Get contacts for tenant
       * @param {number} tenantId - Tenant ID
       * @param {Object} options - Query options
       * @returns {Promise<Object>} Contacts data
       */
      async getContacts(tenantId, options = {}) {
        try {
          const { limit = 50, offset = 0, search } = options;

          const WhatsAppContact = require('../models/WhatsAppContact');

          let query = `
            SELECT * FROM whatsapp_contacts
            WHERE tenant_id = ?
          `;
          const params = [tenantId];

          if (search) {
            query += ` AND (name LIKE ? OR phone_number LIKE ?)`;
            params.push(`%${search}%`, `%${search}%`);
          }

          query += ` ORDER BY last_message_at DESC LIMIT ? OFFSET ?`;
          params.push(limit, offset);

          const [contacts] = await pool.query(query, params);

          return {
            contacts,
            total: contacts.length,
            limit,
            offset
          };
        } catch (error) {
          logger.error(`Error getting contacts: ${error.message}`, { tenantId });
          throw error;
        }
      }

      /**
       * Restore all saved sessions on server startup
       * @returns {Promise<void>}
       */
      async restoreAllSessions() {
        try {
          logger.info('🔄 Restoring saved WhatsApp sessions...');

          // Get all active tenants (exclude system tenant id=0)
          const [tenants] = await pool.query(
            `SELECT id, name FROM tenants WHERE status = 'active' AND id != 0`
          );

          logger.info(`Found ${tenants.length} active tenants`);

          let restored = 0;
          let skipped = 0;

          for (const tenant of tenants) {
            try {
              // Check if tenant has saved session
              const sessionPath = path.join(this.sessionsPath, `tenant_${tenant.id}`, 'creds.json');
              const hasSession = await fs.access(sessionPath).then(() => true).catch(() => false);

              if (hasSession) {
                logger.info(`📁 Restoring session for tenant: ${tenant.name} (ID: ${tenant.id})`);

                // Initialize connection (will load saved session)
                await this.initializeTenant(tenant.id);
                restored++;

                // Small delay to avoid overwhelming the system
                await new Promise(resolve => setTimeout(resolve, 2000));
              } else {
                logger.debug(`⏭️  No saved session for tenant: ${tenant.name} (ID: ${tenant.id})`);
                skipped++;
              }
            } catch (error) {
              logger.error(`❌ Failed to restore session for tenant ${tenant.id}:`, error.message);
            }
          }

          logger.info(`✅ Session restoration complete: ${restored} restored, ${skipped} skipped`);
        } catch (error) {
          logger.error('Error restoring sessions:', error);
        }
      }
    }

    // Singleton instance
    let whatsappServiceInstance = null;

    /**
     * Get WhatsApp service instance
     * @param {Object} io - Socket.IO instance
     * @returns {WhatsAppService} Service instance
     */
    function getWhatsAppService(io) {
      if (!whatsappServiceInstance && io) {
        whatsappServiceInstance = new WhatsAppService(io);
      }
      return whatsappServiceInstance;
    }

    module.exports = { WhatsAppService, getWhatsAppService };