# All files / services/whatsapp WhatsAppStateManager.js

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     /**
     * WhatsAppStateManager
     * Manages WhatsApp session state with tenant isolation
     *
     * @module services/whatsapp/WhatsAppStateManager
     */

    const fs = require('fs');
    const path = require('path');
    const { logger } = require('../../config/logger');

    class WhatsAppStateManager {
      constructor(baseSessionPath) {
        this.baseSessionPath = baseSessionPath || path.join(__dirname, '../../sessions');
        this.ensureBaseDirectory();
      }

      /**
       * Ensure base sessions directory exists
       */
      ensureBaseDirectory() {
        if (!fs.existsSync(this.baseSessionPath)) {
          fs.mkdirSync(this.baseSessionPath, { recursive: true });
          logger.info('Base sessions directory created', { path: this.baseSessionPath });
        }
      }

      /**
       * Get tenant-specific session path
       * @param {number} tenantId - Tenant ID
       * @returns {string} Session path for tenant
       */
      getTenantSessionPath(tenantId) {
        const basePath = path.join(this.baseSessionPath, `tenant_${tenantId}`);
        const nestedPath = path.join(basePath, `tenant_${tenantId}`);
        const nestedCreds = path.join(nestedPath, 'creds.json');
        if (fs.existsSync(nestedCreds)) {
          return nestedPath;
        }
        return basePath;
      }

      /**
       * Ensure tenant session directory exists
       * @param {number} tenantId - Tenant ID
       */
      ensureTenantSessionDirectory(tenantId) {
        const sessionPath = this.getTenantSessionPath(tenantId);
        if (!fs.existsSync(sessionPath)) {
          fs.mkdirSync(sessionPath, { recursive: true });
          logger.info('Tenant session directory created', { tenantId, path: sessionPath });
        }
      }

      /**
       * Check if tenant has saved session
       * @param {number} tenantId - Tenant ID
       * @returns {boolean} True if session exists
       */
      hasSession(tenantId) {
        const sessionPath = this.getTenantSessionPath(tenantId);
        const credsPath = path.join(sessionPath, 'creds.json');
        if (fs.existsSync(credsPath)) {
          return true;
        }
        const nestedPath = path.join(this.baseSessionPath, `tenant_${tenantId}`, `tenant_${tenantId}`);
        const nestedCreds = path.join(nestedPath, 'creds.json');
        return fs.existsSync(nestedCreds);
      }

      /**
       * Clear tenant session
       * @param {number} tenantId - Tenant ID
       * @returns {boolean} Success status
       */
      clearSession(tenantId) {
        try {
          const sessionPath = this.getTenantSessionPath(tenantId);

          if (fs.existsSync(sessionPath)) {
            const files = fs.readdirSync(sessionPath);
            files.forEach(file => {
              const filePath = path.join(sessionPath, file);
              if (fs.lstatSync(filePath).isDirectory()) {
                fs.rmSync(filePath, { recursive: true, force: true });
              } else {
                fs.unlinkSync(filePath);
              }
            });
            logger.info('Tenant session cleared', { tenantId });
            return true;
          }
          return false;
        } catch (error) {
          logger.error('Error clearing tenant session', { tenantId, error: error.message });
          return false;
        }
      }

      /**
       * Backup tenant session
       * @param {number} tenantId - Tenant ID
       * @returns {boolean} Success status
       */
      backupSession(tenantId) {
        try {
          const sessionPath = this.getTenantSessionPath(tenantId);
          const backupPath = path.join(
            this.baseSessionPath,
            `tenant_${tenantId}_backup_${Date.now()}`
          );

          if (!fs.existsSync(sessionPath)) {
            logger.warn('No session to backup', { tenantId });
            return false;
          }

          fs.mkdirSync(backupPath, { recursive: true });

          const files = fs.readdirSync(sessionPath);
          files.forEach(file => {
            const srcPath = path.join(sessionPath, file);
            const destPath = path.join(backupPath, file);

            if (fs.lstatSync(srcPath).isDirectory()) {
              fs.cpSync(srcPath, destPath, { recursive: true });
            } else {
              fs.copyFileSync(srcPath, destPath);
            }
          });

          logger.info('Tenant session backed up', { tenantId, backupPath });
          return true;
        } catch (error) {
          logger.error('Error backing up tenant session', { tenantId, error: error.message });
          return false;
        }
      }

      /**
       * Get tenant session info
       * @param {number} tenantId - Tenant ID
       * @returns {Object} Session info
       */
      getSessionInfo(tenantId) {
        try {
          const sessionPath = this.getTenantSessionPath(tenantId);
          const credsPath = path.join(sessionPath, 'creds.json');

          if (!fs.existsSync(credsPath)) {
            return {
              exists: false,
              tenantId,
              createdAt: null,
              size: 0
            };
          }

          const stats = fs.statSync(credsPath);

          return {
            exists: true,
            tenantId,
            createdAt: stats.mtime,
            size: stats.size,
            path: sessionPath
          };
        } catch (error) {
          logger.error('Error getting tenant session info', { tenantId, error: error.message });
          return {
            exists: false,
            tenantId,
            error: error.message
          };
        }
      }

      /**
       * Clean old backup sessions
       * @param {number} daysToKeep - Days to keep backups
       * @returns {number} Number of cleaned backups
       */
      cleanOldBackups(daysToKeep = 7) {
        try {
          const files = fs.readdirSync(this.baseSessionPath);
          const backupDirs = files.filter(f => f.includes('_backup_'));

          const now = Date.now();
          const maxAge = daysToKeep * 24 * 60 * 60 * 1000;

          let cleaned = 0;

          backupDirs.forEach(dir => {
            const match = dir.match(/_backup_(\d+)$/);
            if (match) {
              const timestamp = parseInt(match[1]);
              const age = now - timestamp;

              if (age > maxAge) {
                const fullPath = path.join(this.baseSessionPath, dir);
                fs.rmSync(fullPath, { recursive: true, force: true });
                cleaned++;
                logger.info('Old backup cleaned', {
                  dir,
                  ageInDays: Math.floor(age / (24 * 60 * 60 * 1000))
                });
              }
            }
          });

          if (cleaned > 0) {
            logger.info('Backup cleanup completed', { cleaned });
          }

          return cleaned;
        } catch (error) {
          logger.error('Error cleaning old backups', { error: error.message });
          return 0;
        }
      }

      /**
       * Get all tenant sessions
       * @returns {Array} Array of tenant IDs with sessions
       */
      getAllTenantSessions() {
        try {
          const files = fs.readdirSync(this.baseSessionPath);
          const tenantDirs = files.filter(f => f.startsWith('tenant_') && !f.includes('_backup_'));

          return tenantDirs.map(dir => {
            const match = dir.match(/^tenant_(\d+)$/);
            return match ? parseInt(match[1]) : null;
          }).filter(id => id !== null);
        } catch (error) {
          logger.error('Error getting all tenant sessions', { error: error.message });
          return [];
        }
      }

      /**
       * Get session statistics
       * @returns {Object} Session statistics
       */
      getStats() {
        try {
          const tenantSessions = this.getAllTenantSessions();
          const backups = fs.readdirSync(this.baseSessionPath)
            .filter(f => f.includes('_backup_')).length;

          return {
            totalSessions: tenantSessions.length,
            totalBackups: backups,
            tenants: tenantSessions
          };
        } catch (error) {
          logger.error('Error getting session stats', { error: error.message });
          return {
            totalSessions: 0,
            totalBackups: 0,
            tenants: []
          };
        }
      }
    }

    module.exports = WhatsAppStateManager;