# All files / services/whatsapp CloudFlowService.js

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     const axios = require('axios');
    const crypto = require('crypto');
    const path = require('path');
    const fs = require('fs');
    const { pool } = require('../../config/database');
    const { logger } = require('../../config/logger');
    const { sendMessage: queueMessage } = require('../MessageService');

    class CloudFlowService {
      static safeJsonParse(value, fallback) {
        if (!value) return fallback;
        try {
          if (typeof value === 'object') return value;
          return JSON.parse(value);
        } catch (error) {
          logger.error('Error parsing flow JSON', { error: error.message });
          return fallback;
        }
      }

      static normalizeFlowText(text) {
        return String(text || '')
          .toLowerCase()
          .normalize('NFD')
          .replace(/[\u0300-\u036f]/g, '')
          .replace(/[^a-z0-9\s]/g, ' ')
          .replace(/\s+/g, ' ')
          .trim();
      }

      static isKeywordTriggerMatch(triggerValue, normalizedText, messageWords) {
        const normalizedTrigger = CloudFlowService.normalizeFlowText(triggerValue || '');
        if (!normalizedTrigger) return false;
        if (normalizedTrigger.includes(' ')) {
          return normalizedText.includes(normalizedTrigger);
        }
        return messageWords.includes(normalizedTrigger);
      }

      static async ensureFlowTables() {
        await pool.execute(`
          CREATE TABLE IF NOT EXISTS whatsapp_cloud_flows (
            id INT AUTO_INCREMENT PRIMARY KEY,
            flow_id VARCHAR(64) NOT NULL,
            tenant_id INT NOT NULL,
            account_id VARCHAR(64),
            name VARCHAR(255) NOT NULL,
            description TEXT,
            active BOOLEAN DEFAULT FALSE,
            trigger_type VARCHAR(50),
            trigger_value VARCHAR(255),
            nodes JSON,
            connections JSON,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
            UNIQUE KEY uniq_flow (tenant_id, flow_id),
            INDEX idx_tenant (tenant_id),
            INDEX idx_account (account_id),
            INDEX idx_active (active)
          ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
        `);

        await pool.execute(`
          CREATE TABLE IF NOT EXISTS whatsapp_cloud_flow_sessions (
            id INT AUTO_INCREMENT PRIMARY KEY,
            tenant_id INT NOT NULL,
            account_id VARCHAR(64),
            contact_phone VARCHAR(30) NOT NULL,
            flow_id VARCHAR(64) NOT NULL,
            current_node_id VARCHAR(64),
            waiting_node_id VARCHAR(64),
            waiting_type VARCHAR(32),
            variables JSON,
            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
            UNIQUE KEY uniq_session (tenant_id, account_id, contact_phone, flow_id),
            INDEX idx_contact (contact_phone),
            INDEX idx_flow (flow_id)
          ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci
        `);
      }

      static resolveWaitingNextNode(node, message, connections) {
        if (node.type === 'button_message') {
          const replyId = message?.interactive?.button_reply?.id || message?.button?.payload || message?.button?.text;
          const replyText = message?.interactive?.button_reply?.title || message?.button?.text || message?.text?.body || '';
          const buttons = node.config?.buttons || [];
          const matchIndex = buttons.findIndex((btn, idx) => {
            const expectedId = `btn_${node.id}_${idx}`;
            return replyId === expectedId || replyText === btn.text;
          });
          if (matchIndex >= 0) {
            const handle = `button-${matchIndex}`;
            const conn = connections.find(c => c.from === node.id && (c.fromHandle || 'default') === handle);
            return conn?.to || null;
          }
        }

        if (node.type === 'list_message') {
          const replyId = message?.interactive?.list_reply?.id;
          const items = node.config?.items || [];
          const matchIndex = items.findIndex((item, idx) => {
            const expectedId = item.id || `row_${node.id}_${idx}`;
            return replyId === expectedId;
          });
          if (matchIndex >= 0) {
            const conn = connections.find(c => c.from === node.id);
            return conn?.to || null;
          }
        }

        if (node.type === 'menu_options') {
          const replyId = message?.interactive?.list_reply?.id;
          const options = node.config?.options || [];
          const matchIndex = options.findIndex((opt, idx) => {
            const expectedId = opt.value || `row_${node.id}_${idx}`;
            return replyId === expectedId;
          });
          if (matchIndex >= 0) {
            const conn = connections.find(c => c.from === node.id);
            return conn?.to || null;
          }
        }

        return null;
      }

      static getStartNode(flow) {
        const targets = new Set((flow.connections || []).map(c => c.to));
        const start = (flow.nodes || []).find(n => !targets.has(n.id));
        return start || (flow.nodes || [])[0] || null;
      }

      static getNextNodeId(flow, nodeId, handle = 'default') {
        const conn = (flow.connections || []).find(c => c.from === nodeId && (c.fromHandle || 'default') === handle);
        return conn?.to || null;
      }

      static async processFlowAutoReply({
        tenantId,
        accountId,
        account,
        conversationId,
        contactPhone,
        contactName,
        message,
        textBody,
        retry = false
      }) {
        try {
          let flows = [];
          const accountIdValue = accountId !== undefined && accountId !== null ? String(accountId) : '';
          try {
            const [flowRows] = await pool.execute(
              `SELECT * FROM whatsapp_cloud_flows
               WHERE tenant_id = ?
                 AND (active = 1 OR active IS NULL)
                 AND (account_id = ? OR account_id IS NULL OR account_id = '' OR account_id = '0' OR account_id = 0)
               ORDER BY updated_at DESC`,
              [tenantId, accountIdValue]
            );
            flows = flowRows;
          } catch (error) {
            if (!retry && error.code === 'ER_NO_SUCH_TABLE') {
              await CloudFlowService.ensureFlowTables();
              return CloudFlowService.processFlowAutoReply({
                tenantId,
                accountId,
                account,
                conversationId,
                contactPhone,
                contactName,
                message,
                textBody,
                retry: true
              });
            }
            throw error;
          }

          if (!flows || flows.length === 0) {
            try {
              const [fallbackRows] = await pool.execute(
                `SELECT * FROM whatsapp_cloud_flows
                 WHERE tenant_id = ? AND (active = 1 OR active IS NULL)
                 ORDER BY updated_at DESC`,
                [tenantId]
              );
              flows = fallbackRows;
            } catch (error) {
              throw error;
            }
          }

          if (!flows || flows.length === 0) {
            return false;
          }

          let sessions = [];
          try {
            const [sessionRows] = await pool.execute(
              `SELECT * FROM whatsapp_cloud_flow_sessions
               WHERE tenant_id = ? AND contact_phone = ? AND (account_id = ? OR account_id IS NULL OR account_id = '' OR account_id = '0' OR account_id = 0)
               ORDER BY updated_at DESC LIMIT 1`,
              [tenantId, contactPhone, accountIdValue]
            );
            sessions = sessionRows;
          } catch (error) {
            if (!retry && error.code === 'ER_NO_SUCH_TABLE') {
              await CloudFlowService.ensureFlowTables();
              return CloudFlowService.processFlowAutoReply({
                tenantId,
                accountId,
                account,
                conversationId,
                contactPhone,
                contactName,
                message,
                textBody,
                retry: true
              });
            }
            throw error;
          }

          const activeSession = sessions?.[0] || null;
          let sessionVariables = activeSession
            ? CloudFlowService.safeJsonParse(activeSession.variables, {})
            : {};
          const normalizedText = CloudFlowService.normalizeFlowText(textBody || '');
          const messageWords = normalizedText.split(' ').filter(Boolean);

          let flowRow = null;
          let flow = null;
          for (const row of flows) {
            if (!row?.nodes) continue;
            const nodes = CloudFlowService.safeJsonParse(row.nodes, []);
            const connections = CloudFlowService.safeJsonParse(row.connections, []);
            if (!nodes || nodes.length === 0) continue;
            const triggerType = row.trigger_type || 'keyword';
            if (triggerType === 'welcome') {
              const now = Date.now();
              const windowMs = 10 * 60 * 1000;
              if (!activeSession?.variables) {
                flowRow = row;
                flow = { ...row, nodes, connections };
                break;
              }
              const existingVars = CloudFlowService.safeJsonParse(activeSession.variables, {});
              const lastSentAt = new Date(existingVars?.welcome?.lastSentAt || 0).getTime();
              if (!lastSentAt || (now - lastSentAt) > windowMs) {
                flowRow = row;
                flow = { ...row, nodes, connections };
                break;
              }
              continue;
            }
            const triggerValue = row.trigger_value || '';
            if (triggerValue === '*' || triggerValue === 'any' || triggerType === 'any') {
              flowRow = row;
              flow = { ...row, nodes, connections };
              break;
            }
            if (triggerType === 'keyword') {
              const matched = CloudFlowService.isKeywordTriggerMatch(triggerValue, normalizedText, messageWords);
              if (matched) {
                flowRow = row;
                flow = { ...row, nodes, connections };
                break;
              }
            }
          }

          if (!flowRow || !flow) return false;

          if (activeSession && activeSession.waiting_type === 'ai') {
            const aiSettings = sessionVariables.ai || {};
            if (!aiSettings.aiConfigId) {
              if (sessionVariables.ai) delete sessionVariables.ai;
              await pool.execute(
                `UPDATE whatsapp_cloud_flow_sessions
                 SET waiting_node_id = NULL, waiting_type = NULL, variables = ?
                 WHERE id = ?`,
                [JSON.stringify(sessionVariables), activeSession.id]
              );
            } else {
              const aiHandled = await CloudFlowService.processCloudAIResponse({
                tenantId,
                account,
                conversationId,
                contactPhone,
                message,
                textBody,
                aiSettings
              });
              return aiHandled;
            }
          }

          if (activeSession && activeSession.waiting_type) {
            const waitNode = flow.nodes.find(n => n.id === activeSession.waiting_node_id);
            if (waitNode) {
              const nextNodeId = CloudFlowService.resolveWaitingNextNode(waitNode, message, flow.connections);
              if (nextNodeId) {
                await pool.execute(
                  `UPDATE whatsapp_cloud_flow_sessions
                   SET current_node_id = ?, waiting_node_id = NULL, waiting_type = NULL
                   WHERE id = ?`,
                  [nextNodeId, activeSession.id]
                );
                await CloudFlowService.executeFlowFromNode({
                  tenantId,
                  accountId,
                  account,
                  conversationId,
                  contactPhone,
                  contactName,
                  flow,
                  startNodeId: nextNodeId,
                  sessionId: activeSession.id,
                  message,
                  textBody
                });
                return true;
              }
              await pool.execute(
                `UPDATE whatsapp_cloud_flow_sessions
                 SET waiting_node_id = NULL, waiting_type = NULL
                 WHERE id = ?`,
                [activeSession.id]
              );
              activeSession.waiting_node_id = null;
              activeSession.waiting_type = null;
            }
          }

          const startNode = CloudFlowService.getStartNode(flow);
          if (!startNode) return false;

          let sessionId = activeSession?.id;
          const isWelcomeFlow = (flowRow.trigger_type || 'keyword') === 'welcome';
          if (isWelcomeFlow) {
            sessionVariables = {
              ...sessionVariables,
              welcome: {
                ...sessionVariables.welcome,
                lastSentAt: new Date().toISOString()
              }
            };
          }
          if (!sessionId) {
            const [result] = await pool.execute(
              `INSERT INTO whatsapp_cloud_flow_sessions
               (tenant_id, account_id, contact_phone, flow_id, current_node_id, variables)
               VALUES (?, ?, ?, ?, ?, ?)`,
              [tenantId, String(accountId), contactPhone, flow.id, startNode.id, JSON.stringify(sessionVariables)]
            );
            sessionId = result.insertId;
          } else {
            await pool.execute(
              `UPDATE whatsapp_cloud_flow_sessions SET current_node_id = ?, variables = ? WHERE id = ?`,
              [startNode.id, JSON.stringify(sessionVariables), sessionId]
            );
          }

          await CloudFlowService.executeFlowFromNode({
            tenantId,
            accountId,
            account,
            conversationId,
            contactPhone,
            contactName,
            flow,
            startNodeId: startNode.id,
            sessionId,
            message,
            textBody
          });
          return true;
        } catch (error) {
          logger.error('Error processing flow auto-reply', {
            error: error.message,
            stack: error.stack,
            code: error.code,
            sqlMessage: error.sqlMessage
          });
          return false;
        }
      }

      static async executeFlowFromNode({
        tenantId,
        accountId,
        account,
        conversationId,
        contactPhone,
        contactName,
        flow,
        startNodeId,
        sessionId,
        message,
        textBody
      }) {
        let currentNodeId = startNodeId;
        let steps = 0;

        while (currentNodeId && steps < 10) {
          steps += 1;
          const node = (flow.nodes || []).find(n => n.id === currentNodeId);
          if (!node) break;

          if (node.type === 'send_message') {
            const body = node.config?.message || node.content || '';
            if (body) {
              const sent = await CloudFlowService.sendFlowTextMessage({
                tenantId,
                account,
                conversationId,
                contactPhone,
                message: body
              });
              if (!sent) {
                return;
              }
            }
            currentNodeId = CloudFlowService.getNextNodeId(flow, node.id);
            continue;
          }

          if (node.type === 'button_message') {
            const sent = await CloudFlowService.sendFlowButtonsMessage({
              tenantId,
              account,
              conversationId,
              contactPhone,
              node
            });
            if (!sent) {
              return;
            }
            await pool.execute(
              `UPDATE whatsapp_cloud_flow_sessions
               SET current_node_id = ?, waiting_node_id = ?, waiting_type = ?
               WHERE id = ?`,
              [node.id, node.id, 'button_message', sessionId]
            );
            return;
          }

          if (node.type === 'list_message') {
            const sent = await CloudFlowService.sendFlowListMessage({
              tenantId,
              account,
              conversationId,
              contactPhone,
              node
            });
            if (!sent) {
              return;
            }
            await pool.execute(
              `UPDATE whatsapp_cloud_flow_sessions
               SET current_node_id = ?, waiting_node_id = ?, waiting_type = ?
               WHERE id = ?`,
              [node.id, node.id, 'list_message', sessionId]
            );
            return;
          }

          if (node.type === 'products') {
            const sent = await CloudFlowService.sendFlowProductsMessage({
              tenantId,
              account,
              conversationId,
              contactPhone,
              node
            });
            if (!sent) {
              return;
            }
            currentNodeId = CloudFlowService.getNextNodeId(flow, node.id);
            continue;
          }

          if (node.type === 'cta_message') {
            const sent = await CloudFlowService.sendFlowCtaMessage({
              tenantId,
              account,
              conversationId,
              contactPhone,
              node
            });
            if (!sent) {
              return;
            }
            currentNodeId = CloudFlowService.getNextNodeId(flow, node.id);
            continue;
          }

          if (node.type === 'send_media') {
            const sent = await CloudFlowService.sendFlowMediaMessage({
              tenantId,
              account,
              conversationId,
              contactPhone,
              node
            });
            if (!sent) {
              return;
            }
            currentNodeId = CloudFlowService.getNextNodeId(flow, node.id);
            continue;
          }

          if (node.type === 'menu_options') {
            const sent = await CloudFlowService.sendFlowMenuOptionsMessage({
              tenantId,
              account,
              conversationId,
              contactPhone,
              node
            });
            if (!sent) {
              return;
            }
            await pool.execute(
              `UPDATE whatsapp_cloud_flow_sessions
               SET current_node_id = ?, waiting_node_id = ?, waiting_type = ?
               WHERE id = ?`,
              [node.id, node.id, 'menu_options', sessionId]
            );
            return;
          }

          if (node.type === 'ai_control') {
            const mode = node.config?.mode || 'enable';
            const [sessionRows] = await pool.execute(
              `SELECT variables FROM whatsapp_cloud_flow_sessions WHERE id = ?`,
              [sessionId]
            );
            const sessionVariables = CloudFlowService.safeJsonParse(sessionRows?.[0]?.variables, {});
            if (mode === 'disable') {
              if (sessionVariables.ai) delete sessionVariables.ai;
              await pool.execute(
                `UPDATE whatsapp_cloud_flow_sessions
                 SET waiting_node_id = NULL, waiting_type = NULL, variables = ?
                 WHERE id = ?`,
                [JSON.stringify(sessionVariables), sessionId]
              );
              currentNodeId = CloudFlowService.getNextNodeId(flow, node.id);
              continue;
            }
            const aiConfigId = node.config?.aiConfigId || '';
            if (!aiConfigId) {
              if (sessionVariables.ai) delete sessionVariables.ai;
              await pool.execute(
                `UPDATE whatsapp_cloud_flow_sessions
                 SET waiting_node_id = NULL, waiting_type = NULL, variables = ?
                 WHERE id = ?`,
                [JSON.stringify(sessionVariables), sessionId]
              );
              currentNodeId = CloudFlowService.getNextNodeId(flow, node.id);
              continue;
            }
            let welcomeMessage = (node.config?.welcomeMessage || '').trim();
            if (welcomeMessage) {
              let personaName = '';
              if (welcomeMessage.includes('{{persona')) {
                let configRows = [];
                if (aiConfigId) {
                  [configRows] = await pool.execute(
                    `SELECT persona_name, model_name
                     FROM ai_configurations
                     WHERE id = ? AND tenant_id = ?
                     LIMIT 1`,
                    [aiConfigId, tenantId]
                  );
                }
                if (!configRows || configRows.length === 0) {
                  [configRows] = await pool.execute(
                    `SELECT persona_name, model_name
                     FROM ai_configurations
                     WHERE tenant_id = ? AND active = TRUE
                     LIMIT 1`,
                    [tenantId]
                  );
                }
                const cfg = configRows?.[0] || null;
                personaName = cfg?.persona_name || cfg?.model_name || '';
                if (personaName) {
                  welcomeMessage = welcomeMessage.replace(/\{\{\s*persona\s*\}\}/gi, personaName);
                }
              }
            }
            sessionVariables.ai = {
              aiConfigId,
              enabled: true,
              temperature: node.config?.temperature ?? '',
              maxTokens: node.config?.maxTokens ?? '',
              prompt: node.config?.prompt || node.config?.instructions || '',
              welcomeMessage
            };
            await pool.execute(
              `UPDATE whatsapp_cloud_flow_sessions
               SET current_node_id = ?, waiting_node_id = ?, waiting_type = ?, variables = ?
               WHERE id = ?`,
              [node.id, node.id, 'ai', JSON.stringify(sessionVariables), sessionId]
            );
            if (sessionVariables.ai.welcomeMessage) {
              await CloudFlowService.sendFlowTextMessage({
                tenantId,
                account,
                conversationId,
                contactPhone,
                message: sessionVariables.ai.welcomeMessage
              });
            }
            await CloudFlowService.processCloudAIResponse({
              tenantId,
              account,
              conversationId,
              contactPhone,
              message,
              textBody,
              aiSettings: sessionVariables.ai
            });
            return;
          }

          if (node.type === 'transfer') {
            const targetType = node.config?.targetType || 'store';
            const targetId = node.config?.targetId || '';
            if (targetId) {
              const storeId = targetType === 'store' ? targetId : null;
              const departmentId = targetType === 'department' ? targetId : null;
              const nextStoreId = storeId || null;
              const nextDepartmentId = null;
              const nextTransferredStore = storeId || null;
              const nextTransferredDepartment = departmentId || null;
              await pool.execute(
                `UPDATE whatsapp_cloud_conversations
                 SET store_id = ?,
                     department_id = ?,
                     transferred_to_store = ?,
                     transferred_to_department = ?,
                     transferred_at = NOW(),
                     claimed_by_user_id = NULL,
                     claimed_at = NULL,
                     updated_at = NOW()
                 WHERE id = ?`,
                [nextStoreId, nextDepartmentId, nextTransferredStore, nextTransferredDepartment, conversationId]
              );
            }
            currentNodeId = CloudFlowService.getNextNodeId(flow, node.id);
            continue;
          }

          if (node.type === 'delay') {
            const delaySeconds = Number(node.config?.delay || 0);
            const responseDelayMs = Math.max(7000, delaySeconds * 1000);
            const reactionDelayMs = 3000;
            const shouldReact = !!node.config?.reaction && !!message?.id;
            if (shouldReact) {
              await new Promise(resolve => setTimeout(resolve, reactionDelayMs));
              await CloudFlowService.sendFlowReaction({
                tenantId,
                account,
                contactPhone,
                messageId: message.id,
                emoji: node.config.reaction
              });
            }
            await new Promise(resolve => setTimeout(resolve, responseDelayMs));
            currentNodeId = CloudFlowService.getNextNodeId(flow, node.id);
            continue;
          }

          if (node.type === 'end_chat') {
            await pool.execute(
              `UPDATE whatsapp_cloud_flow_sessions
               SET current_node_id = NULL, waiting_node_id = NULL, waiting_type = NULL
               WHERE id = ?`,
              [sessionId]
            );
            return;
          }

          if (node.type === 'conditions') {
            const conditions = node.config?.conditions || [];
            let nextNodeId = null;
            for (let i = 0; i < conditions.length; i += 1) {
              const condition = conditions[i];
              const conditionValue = condition?.value || '';
              const normalizedCondition = CloudFlowService.normalizeFlowText(conditionValue);
              if (normalizedCondition && CloudFlowService.normalizeFlowText(textBody || '').includes(normalizedCondition)) {
                nextNodeId = CloudFlowService.getNextNodeId(flow, node.id, `condition-${i}`);
                break;
              }
            }
            if (!nextNodeId) {
              nextNodeId = CloudFlowService.getNextNodeId(flow, node.id);
            }
            if (!nextNodeId) return;
            currentNodeId = nextNodeId;
            continue;
          }

          if (node.type === 'collect_input') {
            await pool.execute(
              `UPDATE whatsapp_cloud_flow_sessions
               SET current_node_id = ?, waiting_node_id = ?, waiting_type = ?
               WHERE id = ?`,
              [node.id, node.id, 'collect_input', sessionId]
            );
            return;
          }

          if (node.type === 'update_contact') {
            const field = node.config?.field || '';
            const value = node.config?.value || '';
            if (field && value) {
              await pool.execute(
                `UPDATE whatsapp_cloud_contacts
                 SET ${field} = ?, updated_at = NOW()
                 WHERE tenant_id = ? AND phone = ?`,
                [value, tenantId, contactPhone]
              );
            }
            currentNodeId = CloudFlowService.getNextNodeId(flow, node.id);
            continue;
          }

          if (node.type === 'save_contact') {
            const name = node.config?.name || contactName || 'Contato';
            await pool.execute(
              `INSERT INTO whatsapp_cloud_contacts (tenant_id, phone, name, created_at)
               VALUES (?, ?, ?, NOW())
               ON DUPLICATE KEY UPDATE name = VALUES(name), updated_at = NOW()`,
              [tenantId, contactPhone, name]
            );
            currentNodeId = CloudFlowService.getNextNodeId(flow, node.id);
            continue;
          }

          if (node.type === 'webhook') {
            const url = node.config?.url || '';
            if (url) {
              try {
                await axios.post(url, {
                  tenantId,
                  accountId,
                  conversationId,
                  contactPhone,
                  contactName,
                  message,
                  textBody,
                  flowId: flow?.id || flow?.flow_id || null
                }, { timeout: 10000 });
              } catch (webhookError) {
                logger.error('Flow webhook error', { error: webhookError.message });
              }
            }
            currentNodeId = CloudFlowService.getNextNodeId(flow, node.id);
            continue;
          }

          currentNodeId = CloudFlowService.getNextNodeId(flow, node.id);
        }
      }

      static async sendFlowTextMessage({ tenantId, account, conversationId, contactPhone, message }) {
        if (!message) return false;
        if (!account?.access_token || !account?.phone_number_id) {
          logger.error('Flow text message missing account credentials', { accountId: account?.id });
          return false;
        }
        try {
          const sendResult = await queueMessage({
            channel: 'cloud',
            tenantId,
            accountId: account?.id,
            to: contactPhone,
            messageType: 'text',
            content: message,
            awaitSend: true
          });

          if (!sendResult.success) {
            return false;
          }

          const messageId = sendResult.messageId || `flow_${Date.now()}`;
          await pool.execute(
            `INSERT INTO whatsapp_cloud_messages
             (conversation_id, message_id, direction, message_type, text_content, status, timestamp, created_at)
             VALUES (?, ?, 'outbound', 'text', ?, 'sent', NOW(), NOW())`,
            [conversationId, messageId, message]
          );

          await pool.execute(
            `UPDATE whatsapp_cloud_conversations
             SET last_message_text = ?, last_message_time = NOW(), last_message_from = 'business', updated_at = NOW()
             WHERE id = ?`,
            [message, conversationId]
          );
          return true;
        } catch (error) {
          logger.error('Error sending flow text message', {
            error: error.message,
            stack: error.stack,
            response: error.response?.data || null
          });
          return false;
        }
      }

      static async sendFlowMediaMessage({ tenantId, account, conversationId, contactPhone, node }) {
        try {
          if (!account?.access_token || !account?.phone_number_id) {
            logger.error('Media message missing account credentials', { accountId: account?.id });
            return false;
          }
          const mediaType = (node.config?.mediaType || 'document').toLowerCase();
          const mediaUrl = node.config?.mediaUrl || '';
          const caption = node.config?.caption || '';
          if (!mediaUrl.trim()) {
            logger.error('Media message missing media URL', { nodeId: node.id });
            return false;
          }

          const allowedTypes = new Set(['image', 'video', 'audio', 'document']);
          const type = allowedTypes.has(mediaType) ? mediaType : 'document';
          const payload = {
            messaging_product: 'whatsapp',
            to: contactPhone,
            type
          };

          let sendResult;
          if (/^https?:\/\//i.test(mediaUrl.trim())) {
            payload[type] = { link: mediaUrl.trim() };
            if (caption && type !== 'audio') {
              payload[type].caption = caption.trim();
            }
            sendResult = await queueMessage({
              channel: 'cloud',
              tenantId,
              accountId: account?.id,
              to: contactPhone,
              messageType: 'raw',
              awaitSend: true,
              metadata: {
                payload: { raw: payload }
              }
            });
          } else {
            let actualPath = mediaUrl.trim();
            if (actualPath.startsWith('/uploads/')) {
              actualPath = path.join(__dirname, '..', actualPath);
            } else if (!path.isAbsolute(actualPath)) {
              actualPath = path.join(__dirname, '..', actualPath);
            }
            if (!fs.existsSync(actualPath)) {
              logger.error('Media file not found for flow', { nodeId: node.id, path: actualPath });
              return false;
            }
            sendResult = await queueMessage({
              channel: 'cloud',
              tenantId,
              accountId: account?.id,
              to: contactPhone,
              messageType: 'media',
              awaitSend: true,
              metadata: {
                payload: {
                  media: {
                    mediaType: type,
                    filePath: actualPath,
                    fileName: path.basename(actualPath),
                    mimeType: node.config?.mimeType || 'application/octet-stream',
                    caption: caption?.trim() || null
                  }
                }
              }
            });
          }

          if (!sendResult.success) {
            return false;
          }

          const messageId = sendResult.messageId || `flow_${Date.now()}`;
          const summary = caption?.trim() || `[${type}]`;
          await pool.execute(
            `INSERT INTO whatsapp_cloud_messages
             (conversation_id, message_id, direction, message_type, text_content, media_url, status, timestamp, created_at)
             VALUES (?, ?, 'outbound', ?, ?, ?, 'sent', NOW(), NOW())`,
            [conversationId, messageId, type, summary, mediaUrl.trim()]
          );

          await pool.execute(
            `UPDATE whatsapp_cloud_conversations
             SET last_message_text = ?, last_message_time = NOW(), last_message_from = 'business', updated_at = NOW()
             WHERE id = ?`,
            [summary, conversationId]
          );
          return true;
        } catch (error) {
          logger.error('Error sending flow media message', {
            error: error.message,
            stack: error.stack,
            response: error.response?.data || null
          });
          return false;
        }
      }

      static async sendFlowMenuOptionsMessage({ tenantId, account, conversationId, contactPhone, node }) {
        try {
          if (!account?.access_token || !account?.phone_number_id) {
            logger.error('Menu options message missing account credentials', { accountId: account?.id });
            return false;
          }
          const prompt = node.config?.prompt || '';
          const options = (node.config?.options || []).filter(opt => opt.label && opt.label.trim()).slice(0, 10);
          if (options.length === 0) {
            logger.error('Menu options has no valid options', { nodeId: node.id });
            return false;
          }
          const truncate = (text, max) => text.length > max ? text.slice(0, max - 1) : text;
          const bodyText = truncate((prompt && prompt.trim() ? prompt.trim() : 'Selecione uma opção'), 1024);

          const payload = {
            messaging_product: 'whatsapp',
            to: contactPhone,
            type: 'interactive',
            interactive: {
              type: 'list',
              body: { text: bodyText },
              action: {
                button: 'Selecionar',
                sections: [
                  {
                    title: 'Opções',
                    rows: options.map((opt, index) => ({
                      id: truncate((opt.value || `row_${node.id}_${index}`).trim(), 200),
                      title: truncate(opt.label.trim(), 24)
                    }))
                  }
                ]
              }
            }
          };

          const sendResult = await queueMessage({
            channel: 'cloud',
            tenantId,
            accountId: account?.id,
            to: contactPhone,
            messageType: 'interactive',
            awaitSend: true,
            metadata: {
              payload: { interactive: payload.interactive }
            }
          });

          if (!sendResult.success) {
            return false;
          }

          const messageId = sendResult.messageId || `flow_${Date.now()}`;
          const summary = bodyText || options.map(opt => opt.label).join(', ');
          await pool.execute(
            `INSERT INTO whatsapp_cloud_messages
             (conversation_id, message_id, direction, message_type, text_content, status, timestamp, created_at)
             VALUES (?, ?, 'outbound', 'interactive', ?, 'sent', NOW(), NOW())`,
            [conversationId, messageId, summary]
          );

          await pool.execute(
            `UPDATE whatsapp_cloud_conversations
             SET last_message_text = ?, last_message_time = NOW(), last_message_from = 'business', updated_at = NOW()
             WHERE id = ?`,
            [summary, conversationId]
          );
          return true;
        } catch (error) {
          logger.error('Error sending menu options message', {
            error: error.message,
            stack: error.stack,
            response: error.response?.data || null
          });
          return false;
        }
      }

      static async sendFlowButtonsMessage({ tenantId, account, conversationId, contactPhone, node }) {
        if (!account?.access_token || !account?.phone_number_id) {
          logger.error('Button message missing account credentials', { accountId: account?.id });
          return false;
        }
        const body = node.config?.message || '';
        const footer = node.config?.footer || '';
        const rawButtons = Array.isArray(node.config?.buttons) ? node.config.buttons : [];
        const buttons = rawButtons
          .filter(btn => btn?.text && btn.text.trim())
          .slice(0, 3);
        if (buttons.length === 0) {
          logger.error('Button message has no valid buttons', { nodeId: node.id });
          return false;
        }
        const truncate = (text, max) => text.length > max ? text.slice(0, max - 1) : text;

        const payload = {
          messaging_product: 'whatsapp',
          to: contactPhone,
          type: 'interactive',
          interactive: {
            type: 'button',
            body: { text: truncate(body || ' ', 1024) },
            action: {
              buttons: buttons.map((btn, index) => ({
                type: 'reply',
                reply: { id: `btn_${node.id}_${index}`, title: truncate(btn.text.trim(), 20) }
              }))
            }
          }
        };

        if (footer) {
          payload.interactive.footer = { text: truncate(footer.trim(), 60) };
        }

        try {
          const sendResult = await queueMessage({
            channel: 'cloud',
            tenantId,
            accountId: account?.id,
            to: contactPhone,
            messageType: 'interactive',
            awaitSend: true,
            metadata: {
              payload: { interactive: payload.interactive }
            }
          });

          if (!sendResult.success) {
            return false;
          }

          const messageId = sendResult.messageId || `flow_${Date.now()}`;
          const summary = body || buttons.map(b => b.text).join(', ');
          await pool.execute(
            `INSERT INTO whatsapp_cloud_messages
             (conversation_id, message_id, direction, message_type, text_content, status, timestamp, created_at)
             VALUES (?, ?, 'outbound', 'interactive', ?, 'sent', NOW(), NOW())`,
            [conversationId, messageId, summary]
          );

          await pool.execute(
            `UPDATE whatsapp_cloud_conversations
             SET last_message_text = ?, last_message_time = NOW(), last_message_from = 'business', updated_at = NOW()
             WHERE id = ?`,
            [summary, conversationId]
          );
          return true;
        } catch (error) {
          logger.error('Error sending button message', {
            error: error.message,
            stack: error.stack,
            response: error.response?.data || null
          });
          return false;
        }
      }

      static async sendFlowListMessage({ tenantId, account, conversationId, contactPhone, node }) {
        try {
          if (!account?.access_token || !account?.phone_number_id) {
            logger.error('List message missing account credentials', { accountId: account?.id });
            return false;
          }
          const header = node.config?.header || '';
          const body = node.config?.body || '';
          const footer = node.config?.footer || '';
          const buttonText = node.config?.buttonText || 'Selecionar';
          const items = (node.config?.items || []).filter(item => item.title && item.title.trim()).slice(0, 10);
          if (items.length === 0) {
            logger.error('List message has no items with title', { nodeId: node.id });
            return false;
          }

          const truncate = (text, max) => text.length > max ? text.slice(0, max - 1) : text;
          const sectionTitle = truncate((header || 'Opções').trim(), 24);
          const buttonLabel = truncate(buttonText.trim(), 20);
          const bodyText = truncate((body && body.trim() ? body.trim() : 'Selecione uma opção'), 1024);

          const payload = {
            messaging_product: 'whatsapp',
            to: contactPhone,
            type: 'interactive',
            interactive: {
              type: 'list',
              body: { text: bodyText },
              action: {
                button: buttonLabel,
                sections: [
                  {
                    title: sectionTitle,
                    rows: items.map((item, index) => ({
                      id: truncate((item.id || `row_${node.id}_${index}`).trim(), 200),
                      title: truncate(item.title.trim(), 24),
                      description: item.description ? truncate(item.description.trim(), 72) : undefined
                    }))
                  }
                ]
              }
            }
          };

          if (footer && footer.trim()) {
            payload.interactive.footer = { text: truncate(footer.trim(), 60) };
          }

          const sendResult = await queueMessage({
            channel: 'cloud',
            tenantId,
            accountId: account?.id,
            to: contactPhone,
            messageType: 'interactive',
            awaitSend: true,
            metadata: {
              payload: { interactive: payload.interactive }
            }
          });

          if (!sendResult.success) {
            return false;
          }

          const messageId = sendResult.messageId || `flow_${Date.now()}`;
          const summary = bodyText || items.map(i => i.title).join(', ');
          await pool.execute(
            `INSERT INTO whatsapp_cloud_messages
             (conversation_id, message_id, direction, message_type, text_content, status, timestamp, created_at)
             VALUES (?, ?, 'outbound', 'interactive', ?, 'sent', NOW(), NOW())`,
            [conversationId, messageId, summary]
          );

          await pool.execute(
            `UPDATE whatsapp_cloud_conversations
             SET last_message_text = ?, last_message_time = NOW(), last_message_from = 'business', updated_at = NOW()
             WHERE id = ?`,
            [summary, conversationId]
          );
          return true;
        } catch (error) {
          logger.error('Error sending list message', {
            error: error.message,
            stack: error.stack,
            response: error.response?.data || null
          });
          return false;
        }
      }

      static async sendFlowProductsMessage({ tenantId, account, conversationId, contactPhone, node }) {
        try {
          if (!account?.access_token || !account?.phone_number_id) {
            logger.error('Products message missing account credentials', { accountId: account?.id });
            return false;
          }
          const rawIds = node.config?.productIds || '';
          const limit = Math.max(1, parseInt(node.config?.limit, 10) || 5);
          const displayMode = node.config?.displayMode || 'list';
          const includePrice = node.config?.includePrice !== false;
          const message = node.config?.message || '';
          const ids = rawIds
            .split(/[\s,;]+/)
            .map(value => parseInt(value, 10))
            .filter(value => Number.isFinite(value));
          let products = [];
          if (ids.length > 0) {
            const uniqueIds = Array.from(new Set(ids));
            const placeholders = uniqueIds.map(() => '?').join(',');
            const [rows] = await pool.execute(
              `SELECT * FROM woocommerce_products WHERE tenant_id = ? AND wc_product_id IN (${placeholders}) AND is_active = TRUE`,
              [tenantId, ...uniqueIds]
            );
            const byId = new Map(rows.map(row => [String(row.wc_product_id), row]));
            products = ids.map(id => byId.get(String(id))).filter(Boolean);
          } else {
            const [rows] = await pool.execute(
              `SELECT * FROM woocommerce_products
               WHERE tenant_id = ? AND is_active = TRUE
               ORDER BY updated_at DESC
               LIMIT ?`,
              [tenantId, limit]
            );
            products = rows;
          }
          if (products.length === 0) {
            logger.error('No WooCommerce products found for flow', { nodeId: node.id });
            return false;
          }
          const truncate = (text, max) => text.length > max ? text.slice(0, max - 1) : text;
          const formatPrice = (product) => {
            const price = product.sale_price || product.regular_price || product.price;
            if (!price) return 'Consulte';
            return `R$ ${parseFloat(price).toFixed(2).replace('.', ',')}`;
          };

          let payload;
          if (displayMode === 'carousel') {
            const eligibleProducts = products.filter(product => (
              (product.thumbnail_url || product.image_url) && (product.permalink || '').trim()
            ));
            if (eligibleProducts.length < 2) {
              return CloudFlowService.sendFlowProductsMessage({
                tenantId,
                account,
                conversationId,
                contactPhone,
                node: { ...node, config: { ...node.config, displayMode: 'list' } }
              });
            }
            const carouselBody = truncate(message && message.trim() ? message.trim() : 'Confira nossos produtos', 1024);
            const cards = eligibleProducts.slice(0, 10).map((product, index) => {
              const imageLink = product.thumbnail_url || product.image_url;
              const priceText = includePrice ? formatPrice(product) : '';
              const shortDesc = product.short_description || '';
              const bodyText = truncate(
                `${product.name || 'Produto'}${priceText ? `\n${priceText}` : ''}${shortDesc ? `\n${shortDesc}` : ''}`,
                160
              );
              return {
                card_index: index,
                type: 'cta_url',
                header: { type: 'image', image: { link: imageLink } },
                body: { text: bodyText },
                action: {
                  name: 'cta_url',
                  parameters: {
                    display_text: truncate('Ver produto', 20),
                    url: product.permalink
                  }
                }
              };
            });
            payload = {
              messaging_product: 'whatsapp',
              to: contactPhone,
              type: 'interactive',
              interactive: {
                type: 'carousel',
                body: { text: carouselBody },
                action: { cards }
              }
            };
          } else {
            const buttonLabel = truncate('Selecionar', 20);
            const bodyText = truncate(message && message.trim() ? message.trim() : 'Selecione um produto', 1024);
            const rows = products.slice(0, 10).map(product => {
              const descriptionBase = product.short_description || '';
              const priceText = includePrice ? formatPrice(product) : '';
              const description = priceText
                ? `${priceText}${descriptionBase ? ` - ${descriptionBase}` : ''}`
                : descriptionBase;
              return {
                id: truncate(`product_${product.wc_product_id}`, 200),
                title: truncate((product.name || 'Produto').trim(), 24),
                description: description ? truncate(description.trim(), 72) : undefined
              };
            }).filter(row => row.title && row.title.trim());
            if (rows.length === 0) {
              logger.error('WooCommerce product list has no valid rows', { nodeId: node.id });
              return false;
            }
            payload = {
              messaging_product: 'whatsapp',
              to: contactPhone,
              type: 'interactive',
              interactive: {
                type: 'list',
                body: { text: bodyText },
                action: {
                  button: buttonLabel,
                  sections: [
                    {
                      title: truncate('Produtos', 24),
                      rows
                    }
                  ]
                }
              }
            };
          }

          const sendResult = await queueMessage({
            channel: 'cloud',
            tenantId,
            accountId: account?.id,
            to: contactPhone,
            messageType: 'products',
            awaitSend: true,
            metadata: {
              payload: { interactive: payload.interactive }
            }
          });

          if (!sendResult.success) {
            return false;
          }

          const messageId = sendResult.messageId || `flow_${Date.now()}`;
          const summary = message && message.trim()
            ? message.trim()
            : products.map(product => product.name).join(', ');
          await pool.execute(
            `INSERT INTO whatsapp_cloud_messages
             (conversation_id, message_id, direction, message_type, text_content, status, timestamp, created_at)
             VALUES (?, ?, 'outbound', 'interactive', ?, 'sent', NOW(), NOW())`,
            [conversationId, messageId, summary]
          );

          await pool.execute(
            `UPDATE whatsapp_cloud_conversations
             SET last_message_text = ?, last_message_time = NOW(), last_message_from = 'business', updated_at = NOW()
             WHERE id = ?`,
            [summary, conversationId]
          );
          return true;
        } catch (error) {
          logger.error('Error sending WooCommerce products message', {
            error: error.message,
            stack: error.stack,
            response: error.response?.data || null
          });
          return false;
        }
      }

      static async sendFlowCtaMessage({ tenantId, account, conversationId, contactPhone, node }) {
        const header = node.config?.header || '';
        const body = node.config?.body || '';
        const footer = node.config?.footer || '';
        const buttonText = node.config?.buttonText || '';
        let ctaType = node.config?.ctaType || 'url';
        if (ctaType === 'cta_call' || ctaType === 'call') ctaType = 'phone';
        if (ctaType === 'cta_url') ctaType = 'url';
        if (ctaType !== 'url' && ctaType !== 'phone') ctaType = 'url';
        const ctaValue = node.config?.ctaValue || '';
        try {
          if (!account?.access_token || !account?.phone_number_id) {
            logger.error('CTA message missing account credentials', { accountId: account?.id });
            return false;
          }
          const truncate = (text, max) => text.length > max ? text.slice(0, max - 1) : text;
          const normalizeUrl = (value) => {
            const trimmed = value.trim();
            if (!trimmed) return '';
            const normalized = trimmed.startsWith('http://') || trimmed.startsWith('https://')
              ? trimmed
              : `https://${trimmed}`;
            try {
              const url = new URL(normalized);
              return url.href;
            } catch (error) {
              return '';
            }
          };
          const normalizePhone = (value) => {
            const digits = value.replace(/[^\d+]/g, '');
            if (!digits) return '';
            return digits.startsWith('+') ? digits : `+${digits}`;
          };
          const bodyText = body && body.trim() ? body.trim() : (header && header.trim() ? header.trim() : 'Clique abaixo');
          const resolvedButtonText = buttonText && buttonText.trim()
            ? buttonText.trim()
            : (ctaType === 'phone' ? 'Ligar' : 'Abrir');
          const normalizedUrl = ctaType === 'phone' ? '' : normalizeUrl(ctaValue);
          const normalizedPhone = ctaType === 'phone' ? normalizePhone(ctaValue) : '';
          const ctaUrl = ctaType === 'phone'
            ? (normalizedPhone ? `tel:${normalizedPhone}` : '')
            : normalizedUrl;
          if (!bodyText || !ctaUrl) {
            logger.error('CTA message missing body or value', { nodeId: node.id });
            throw new Error('Invalid CTA payload');
          }
          const basePayload = {
            messaging_product: 'whatsapp',
            to: contactPhone,
            recipient_type: 'individual',
            type: 'interactive',
            interactive: {
              type: 'cta_url',
              body: { text: truncate(bodyText, 1024) },
              action: {
                name: 'cta_url',
                parameters: {
                  display_text: truncate(resolvedButtonText, 20),
                  url: ctaUrl
                }
              }
            }
          };

          if (header && header.trim()) {
            basePayload.interactive.header = { type: 'text', text: truncate(header.trim(), 60) };
          }
          if (footer && footer.trim()) {
            basePayload.interactive.footer = { text: truncate(footer.trim(), 60) };
          }

          let sendResult = await queueMessage({
            channel: 'cloud',
            tenantId,
            accountId: account?.id,
            to: contactPhone,
            messageType: 'cta',
            awaitSend: true,
            metadata: {
              payload: { interactive: basePayload.interactive }
            }
          });

          if (!sendResult.success) {
            const trimmedPayload = {
              interactive: {
                type: basePayload.interactive.type,
                body: basePayload.interactive.body,
                action: basePayload.interactive.action
              }
            };
            sendResult = await queueMessage({
              channel: 'cloud',
              tenantId,
              accountId: account?.id,
              to: contactPhone,
              messageType: 'cta',
              awaitSend: true,
              metadata: {
                payload: trimmedPayload
              }
            });
          }

          if (!sendResult.success) {
            return false;
          }

          const messageId = sendResult.messageId || `flow_${Date.now()}`;
          const summary = bodyText;
          await pool.execute(
            `INSERT INTO whatsapp_cloud_messages
             (conversation_id, message_id, direction, message_type, text_content, status, timestamp, created_at)
             VALUES (?, ?, 'outbound', 'interactive', ?, 'sent', NOW(), NOW())`,
            [conversationId, messageId, summary]
          );

          await pool.execute(
            `UPDATE whatsapp_cloud_conversations
             SET last_message_text = ?, last_message_time = NOW(), last_message_from = 'business', updated_at = NOW()
             WHERE id = ?`,
            [summary, conversationId]
          );
          return true;
        } catch (error) {
          logger.error('Error sending CTA message', {
            error: error.message,
            stack: error.stack,
            response: error.response?.data || null
          });
          try {
            const fallbackBody = body && body.trim() ? body.trim() : (header && header.trim() ? header.trim() : 'Clique abaixo');
            const fallbackValue = ctaValue && ctaValue.trim() ? ctaValue.trim() : '';
            const fallbackText = fallbackValue ? `${fallbackBody}\n${fallbackValue}` : fallbackBody;
            await CloudFlowService.sendFlowTextMessage({
              tenantId,
              account,
              conversationId,
              contactPhone,
              message: fallbackText
            });
            return true;
          } catch (fallbackError) {
            logger.error('Error sending CTA fallback text', { error: fallbackError.message });
            return false;
          }
        }
      }

      static async sendFlowReaction({ tenantId, account, contactPhone, messageId, emoji }) {
        if (!messageId || !emoji) return false;
        try {
          const sendResult = await queueMessage({
            channel: 'cloud',
            tenantId,
            accountId: account?.id,
            to: contactPhone,
            messageType: 'reaction',
            awaitSend: true,
            metadata: {
              payload: {
                reaction: {
                  message_id: messageId,
                  emoji
                }
              }
            }
          });
          if (!sendResult.success) {
            return false;
          }
          return true;
        } catch (error) {
          logger.warn('Error sending reaction', { error: error.message });
          return false;
        }
      }

      static decryptApiKey(encryptedText) {
        try {
          const keyString = process.env.ENCRYPTION_KEY || 'default-key-change-in-production-32';
          const key = crypto.createHash('sha256').update(keyString).digest();
          const textParts = encryptedText.split(':');
          const iv = Buffer.from(textParts.shift(), 'hex');
          const encrypted = textParts.join(':');
          const decipher = crypto.createDecipheriv('aes-256-cbc', key, iv);
          let decrypted = decipher.update(encrypted, 'hex', 'utf8');
          decrypted += decipher.final('utf8');
          return decrypted;
        } catch (error) {
          logger.error('Error decrypting API key', { error: error.message });
          return null;
        }
      }

      static async processCloudAIResponse({ tenantId, account, conversationId, contactPhone, message: _message, textBody, aiSettings }) {
        if (!textBody) return false;
        if (!aiSettings || !aiSettings.aiConfigId) {
          return false;
        }
        let connection;
        try {
          connection = await pool.getConnection();
          let config = null;
          const [configRows] = await connection.execute(
            `SELECT * FROM ai_configurations WHERE id = ? AND tenant_id = ? LIMIT 1`,
            [aiSettings.aiConfigId, tenantId]
          );
          if (configRows.length > 0) config = configRows[0];
          if (!config) {
            connection.release();
            return false;
          }
          const apiKey = CloudFlowService.decryptApiKey(config.api_key);
          if (!apiKey) {
            connection.release();
            return false;
          }
          if (config.business_hours_start && config.business_hours_end) {
            const now = new Date();
            const currentTime = now.toTimeString().slice(0, 5);
            const currentDay = now.toLocaleDateString('en-US', { weekday: 'long' }).toLowerCase();
            const businessDays = (config.business_days || '').toLowerCase().split(',').map(d => d.trim()).filter(Boolean);
            if (businessDays.length > 0 && !businessDays.includes(currentDay)) {
              connection.release();
              return false;
            }
            if (currentTime < String(config.business_hours_start).slice(0, 5) || currentTime > String(config.business_hours_end).slice(0, 5)) {
              connection.release();
              return false;
            }
          }
          const [history] = await connection.execute(
            `SELECT text_content, direction
             FROM whatsapp_cloud_messages
             WHERE conversation_id = ?
             ORDER BY created_at DESC LIMIT 10`,
            [conversationId]
          );
          const messages = [];
          const systemPrompt = aiSettings?.prompt || aiSettings?.instructions || config.system_prompt || config.persona_description || 'You are a helpful assistant.';
          if (systemPrompt) {
            messages.push({ role: 'system', content: systemPrompt });
          }
          const reversedHistory = history.reverse();
          for (const msg of reversedHistory) {
            if (!msg?.text_content) continue;
            messages.push({
              role: msg.direction === 'inbound' ? 'user' : 'assistant',
              content: msg.text_content
            });
          }
          if (messages.length === 0 || messages[messages.length - 1].content !== textBody) {
            messages.push({ role: 'user', content: textBody });
          }
          const temperatureValue = Number.isFinite(parseFloat(aiSettings?.temperature))
            ? parseFloat(aiSettings.temperature)
            : parseFloat(config.temperature) || 0.7;
          const maxTokensValue = Number.isFinite(parseInt(aiSettings?.maxTokens, 10))
            ? parseInt(aiSettings.maxTokens, 10)
            : parseInt(config.max_tokens, 10) || 1000;
          const apiUrl = config.provider === 'deepseek'
            ? 'https://api.deepseek.com/v1/chat/completions'
            : 'https://api.openai.com/v1/chat/completions';
          const response = await axios.post(
            apiUrl,
            {
              model: config.model_name,
              messages,
              temperature: temperatureValue,
              max_tokens: maxTokensValue
            },
            {
              headers: {
                'Authorization': `Bearer ${apiKey}`,
                'Content-Type': 'application/json'
              },
              timeout: 30000
            }
          );
          const aiResponse = response?.data?.choices?.[0]?.message?.content;
          if (!aiResponse) {
            connection.release();
            return false;
          }
          const delayMs = Math.max(0, Number(config.response_delay || 0) * 1000);
          if (delayMs) {
            await new Promise(resolve => setTimeout(resolve, delayMs));
          }
          await CloudFlowService.sendFlowTextMessage({
            tenantId,
            account,
            conversationId,
            contactPhone,
            message: aiResponse
          });
          connection.release();
          return true;
        } catch (error) {
          if (connection) connection.release();
          logger.error('Error processing cloud AI response', { error: error.message, tenantId });
          return false;
        }
      }
    }

    module.exports = { CloudFlowService };