# All files WhatsAppCloudFAQController.js

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     /**
     * WhatsApp Cloud FAQ Controller
     * Handles FAQ management for WhatsApp Cloud accounts
     *
     * @module controllers/WhatsAppCloudFAQController
     */

    const WhatsAppCloudFAQ = require('../models/WhatsAppCloudFAQ');
    const { logger } = require('../config/logger');
    const { sanitizeInput } = require('../utils/sanitizer');

    class WhatsAppCloudFAQController {
      /**
       * List all FAQs for tenant/account
       * GET /api/user/whatsapp-cloud/faqs
       */
      static async list(req, res) {
        try {
          const tenantId = req.tenantId || req.user?.tenantId || 1;
          const { active, accountId } = req.query;

          const faqs = await WhatsAppCloudFAQ.getByTenantId(
            tenantId,
            accountId ? parseInt(accountId) : null,
            active === 'true'
          );

          res.json({
            success: true,
            data: faqs
          });
        } catch (error) {
          logger.error('Error listing WhatsApp Cloud FAQs', {
            error: error.message
          });
          res.status(500).json({
            success: false,
            error: 'Failed to load FAQs'
          });
        }
      }

      /**
       * Get FAQ by ID
       * GET /api/user/whatsapp-cloud/faqs/:id
       */
      static async getById(req, res) {
        try {
          const tenantId = req.tenantId || req.user.tenantId;
          const { id } = req.params;

          const faq = await WhatsAppCloudFAQ.getById(id, tenantId);

          if (!faq) {
            return res.status(404).json({
              success: false,
              error: 'FAQ not found'
            });
          }

          res.json({
            success: true,
            data: faq
          });
        } catch (error) {
          logger.error('Error getting WhatsApp Cloud FAQ', {
            id: req.params.id,
            tenantId: req.tenantId || req.user.tenantId,
            error: error.message
          });
          res.status(500).json({
            success: false,
            error: 'Failed to load FAQ'
          });
        }
      }

      /**
       * Search FAQs
       * GET /api/user/whatsapp-cloud/faqs/search
       */
      static async search(req, res) {
        try {
          const tenantId = req.tenantId || req.user.tenantId;
          const { q, accountId } = req.query;

          if (!q) {
            return res.status(400).json({
              success: false,
              error: 'Search query is required'
            });
          }

          const faqs = await WhatsAppCloudFAQ.search(
            tenantId,
            sanitizeInput(q),
            accountId ? parseInt(accountId) : null
          );

          res.json({
            success: true,
            data: faqs
          });
        } catch (error) {
          logger.error('Error searching WhatsApp Cloud FAQs', {
            tenantId: req.tenantId || req.user.tenantId,
            error: error.message
          });
          res.status(500).json({
            success: false,
            error: 'Failed to search FAQs'
          });
        }
      }

      /**
       * Create new FAQ
       * POST /api/user/whatsapp-cloud/faqs
       */
      static async create(req, res) {
        try {
          const tenantId = req.tenantId || req.user?.tenantId || 1;

          const {
            question,
            answer,
            keywords,
            emoji,
            category,
            active,
            order_position,
            trigger_type,
            account_id
          } = req.body;

          if (!question || !answer) {
            return res.status(400).json({
              success: false,
              error: 'Question and answer are required'
            });
          }

          const data = {
            question: question.trim(),
            answer: answer.trim(),
            keywords: keywords ? keywords.trim() : null,
            emoji: emoji ? emoji.trim() : null,
            category: category || 'general',
            active: active !== false,
            order_position: order_position || 0,
            trigger_type: trigger_type || 'keyword',
            account_id: account_id || null
          };

          const faq = await WhatsAppCloudFAQ.create(tenantId, data);

          res.status(201).json({
            success: true,
            message: 'FAQ created successfully',
            data: faq
          });
        } catch (error) {
          logger.error('Error creating FAQ', {
            error: error.message,
            stack: error.stack
          });

          res.status(500).json({
            success: false,
            error: 'Failed to create FAQ: ' + error.message
          });
        }
      }

      /**
       * Update FAQ
       * PUT /api/user/whatsapp-cloud/faqs/:id
       */
      static async update(req, res) {
        try {
          const tenantId = req.tenantId || req.user.tenantId;
          const { id } = req.params;
          const { question, answer, keywords, emoji, category, active, order_position, trigger_type, account_id } = req.body;

          // Check if FAQ exists
          const existing = await WhatsAppCloudFAQ.getById(id, tenantId);
          if (!existing) {
            return res.status(404).json({
              success: false,
              error: 'FAQ not found'
            });
          }

          const data = {};
          if (question !== undefined) data.question = sanitizeInput(question);
          if (answer !== undefined) data.answer = sanitizeInput(answer);
          if (keywords !== undefined) data.keywords = keywords ? sanitizeInput(keywords) : null;
          if (emoji !== undefined) data.emoji = emoji ? sanitizeInput(emoji) : null;
          if (category !== undefined) data.category = sanitizeInput(category);
          if (active !== undefined) data.active = active;
          if (order_position !== undefined) data.order_position = order_position;
          if (trigger_type !== undefined) data.trigger_type = trigger_type;
          if (account_id !== undefined) data.account_id = account_id;

          const faq = await WhatsAppCloudFAQ.update(id, tenantId, data);

          logger.info('WhatsApp Cloud FAQ updated', {
            tenantId,
            faqId: id,
            userId: req.user.id
          });

          res.json({
            success: true,
            message: 'FAQ updated successfully',
            data: faq
          });
        } catch (error) {
          logger.error('Error updating WhatsApp Cloud FAQ', {
            id: req.params.id,
            tenantId: req.tenantId || req.user.tenantId,
            error: error.message
          });
          res.status(500).json({
            success: false,
            error: 'Failed to update FAQ'
          });
        }
      }

      /**
       * Delete FAQ
       * DELETE /api/user/whatsapp-cloud/faqs/:id
       */
      static async delete(req, res) {
        try {
          const tenantId = req.tenantId || req.user.tenantId;
          const { id } = req.params;

          const deleted = await WhatsAppCloudFAQ.delete(id, tenantId);

          if (!deleted) {
            return res.status(404).json({
              success: false,
              error: 'FAQ not found'
            });
          }

          logger.info('WhatsApp Cloud FAQ deleted', {
            tenantId,
            faqId: id,
            userId: req.user.id
          });

          res.json({
            success: true,
            message: 'FAQ deleted successfully'
          });
        } catch (error) {
          logger.error('Error deleting WhatsApp Cloud FAQ', {
            id: req.params.id,
            tenantId: req.tenantId || req.user.tenantId,
            error: error.message
          });
          res.status(500).json({
            success: false,
            error: 'Failed to delete FAQ'
          });
        }
      }

      /**
       * Toggle FAQ active status
       * PATCH /api/user/whatsapp-cloud/faqs/:id/toggle
       */
      static async toggleActive(req, res) {
        try {
          const tenantId = req.tenantId || req.user.tenantId;
          const { id } = req.params;

          const faq = await WhatsAppCloudFAQ.toggleActive(id, tenantId);

          logger.info('WhatsApp Cloud FAQ status toggled', {
            tenantId,
            faqId: id,
            newStatus: faq.active,
            userId: req.user.id
          });

          res.json({
            success: true,
            message: 'FAQ status updated successfully',
            data: faq
          });
        } catch (error) {
          logger.error('Error toggling WhatsApp Cloud FAQ status', {
            id: req.params.id,
            tenantId: req.tenantId || req.user.tenantId,
            error: error.message
          });
          res.status(500).json({
            success: false,
            error: 'Failed to update FAQ status'
          });
        }
      }

      /**
       * Reorder FAQs
       * POST /api/user/whatsapp-cloud/faqs/reorder
       */
      static async reorder(req, res) {
        try {
          const tenantId = req.tenantId || req.user.tenantId;
          const { order } = req.body;

          if (!Array.isArray(order)) {
            return res.status(400).json({
              success: false,
              error: 'Order must be an array'
            });
          }

          await WhatsAppCloudFAQ.reorder(tenantId, order);

          logger.info('WhatsApp Cloud FAQs reordered', {
            tenantId,
            count: order.length,
            userId: req.user.id
          });

          res.json({
            success: true,
            message: 'FAQs reordered successfully'
          });
        } catch (error) {
          logger.error('Error reordering WhatsApp Cloud FAQs', {
            tenantId: req.tenantId || req.user.tenantId,
            error: error.message
          });
          res.status(500).json({
            success: false,
            error: 'Failed to reorder FAQs'
          });
        }
      }

      /**
       * Get FAQ statistics
       * GET /api/user/whatsapp-cloud/faqs/statistics
       */
      static async getStatistics(req, res) {
        try {
          const tenantId = req.tenantId || req.user.tenantId;
          const { accountId } = req.query;

          const stats = await WhatsAppCloudFAQ.getStatistics(
            tenantId,
            accountId ? parseInt(accountId) : null
          );

          res.json({
            success: true,
            data: stats
          });
        } catch (error) {
          logger.error('Error getting WhatsApp Cloud FAQ statistics', {
            tenantId: req.tenantId || req.user.tenantId,
            error: error.message
          });
          res.status(500).json({
            success: false,
            error: 'Failed to load statistics'
          });
        }
      }

      /**
       * Get FAQ settings
       * GET /api/user/whatsapp-cloud/faqs/settings
       */
      static async getSettings(req, res) {
        try {
          const tenantId = req.tenantId || req.user.tenantId;
          const { accountId } = req.query;

          const settings = await WhatsAppCloudFAQ.getSettings(
            tenantId,
            accountId ? parseInt(accountId) : null
          );

          res.json({
            success: true,
            data: settings
          });
        } catch (error) {
          logger.error('Error getting WhatsApp Cloud FAQ settings', {
            tenantId: req.tenantId || req.user.tenantId,
            error: error.message
          });
          res.status(500).json({
            success: false,
            error: 'Failed to load settings'
          });
        }
      }

      /**
       * Save FAQ settings
       * POST /api/user/whatsapp-cloud/faqs/settings
       */
      static async saveSettings(req, res) {
        try {
          const tenantId = req.tenantId || req.user.tenantId;
          const { accountId, ...settings } = req.body;

          // Sanitize text fields
          if (settings.menu_trigger_keyword) {
            settings.menu_trigger_keyword = sanitizeInput(settings.menu_trigger_keyword);
          }
          if (settings.welcome_message) {
            settings.welcome_message = sanitizeInput(settings.welcome_message);
          }
          if (settings.no_match_message) {
            settings.no_match_message = sanitizeInput(settings.no_match_message);
          }
          if (settings.menu_header) {
            settings.menu_header = sanitizeInput(settings.menu_header);
          }
          if (settings.menu_footer) {
            settings.menu_footer = sanitizeInput(settings.menu_footer);
          }

          const savedSettings = await WhatsAppCloudFAQ.saveSettings(
            tenantId,
            settings,
            accountId ? parseInt(accountId) : null
          );

          logger.info('WhatsApp Cloud FAQ settings saved', {
            tenantId,
            accountId,
            userId: req.user.id
          });

          res.json({
            success: true,
            message: 'Settings saved successfully',
            data: savedSettings
          });
        } catch (error) {
          logger.error('Error saving WhatsApp Cloud FAQ settings', {
            tenantId: req.tenantId || req.user.tenantId,
            error: error.message
          });
          res.status(500).json({
            success: false,
            error: 'Failed to save settings'
          });
        }
      }
      /**
       * Get FAQ analytics by ID
       * GET /api/user/whatsapp-cloud/faqs/:id/analytics
       */
      static async getFAQAnalytics(req, res) {
        try {
          const tenantId = req.tenantId || req.user.tenantId;
          const { id } = req.params;

          // Get FAQ details
          const faq = await WhatsAppCloudFAQ.getById(id, tenantId);
          if (!faq) {
            return res.status(404).json({
              success: false,
              error: 'FAQ not found'
            });
          }

          // Get recent usage
          const { pool } = require('../config/database');
          const [recentUsage] = await pool.query(
            `SELECT user_message, confidence_score, algorithm_used, intent, created_at
             FROM whatsapp_cloud_faq_usage
             WHERE tenant_id = ? AND faq_id = ?
             ORDER BY created_at DESC
             LIMIT 10`,
            [tenantId, id]
          );

          // Get related failed searches
          const [failedSearches] = await pool.query(
            `SELECT query, search_count, last_searched_at
             FROM whatsapp_cloud_faq_failed_searches
             WHERE tenant_id = ?
             AND (query LIKE CONCAT('%', (SELECT question FROM whatsapp_cloud_faqs WHERE id = ? LIMIT 1), '%')
                  OR query LIKE CONCAT('%', (SELECT keywords FROM whatsapp_cloud_faqs WHERE id = ? LIMIT 1), '%'))
             ORDER BY search_count DESC
             LIMIT 5`,
            [tenantId, id, id]
          );

          // Get feedback stats
          const [feedbackStats] = await pool.query(
            `SELECT
               SUM(CASE WHEN rating = 1 THEN 1 ELSE 0 END) as helpful_count,
               SUM(CASE WHEN rating = 0 THEN 1 ELSE 0 END) as unhelpful_count,
               AVG(rating) as avg_rating,
               COUNT(*) as total_feedback
             FROM whatsapp_cloud_faq_feedback
             WHERE tenant_id = ? AND faq_id = ?`,
            [tenantId, id]
          );

          const analytics = {
            faq: faq,
            recent_usage: recentUsage || [],
            failed_searches: failedSearches || [],
            helpful_feedback: feedbackStats[0]?.helpful_count || 0,
            unhelpful_feedback: feedbackStats[0]?.unhelpful_count || 0,
            avg_rating: feedbackStats[0]?.avg_rating || 0,
            total_feedback: feedbackStats[0]?.total_feedback || 0
          };

          res.json({
            success: true,
            data: analytics
          });

        } catch (error) {
          logger.error('Error getting FAQ analytics', {
            id: req.params.id,
            tenantId: req.tenantId || req.user.tenantId,
            error: error.message
          });
          res.status(500).json({
            success: false,
            error: 'Failed to load analytics'
          });
        }
      }
    }

    module.exports = WhatsAppCloudFAQController;