# All files / controllers PlanLimitsController.js

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     /**
     * Plan Limits Controller
     * Provides information about tenant plan limits and current usage
     *
     * @module controllers/PlanLimitsController
     */

    const { pool } = require('../config/database');
    const { logger } = require('../config/logger');
    const { getTenantPlanLimits, getCurrentResourceCount } = require('../middleware/planLimits');

    class PlanLimitsController {
      /**
       * Get tenant plan limits and current usage
       * GET /api/tenant/plan-limits
       */
      static async getLimits(req, res) {
        try {
          const tenantId = req.tenantId || req.user?.tenantId;

          if (!tenantId) {
            return res.status(400).json({
              success: false,
              error: 'Tenant context is required'
            });
          }

          // Get plan limits
          const limits = await getTenantPlanLimits(tenantId);

          // Get current usage for all resources
          const resources = [
            'stores',
            'users',
            'departments',
            'contacts',
            'devices',
            'conversations',
            'faqs',
            'contact_groups',
            'email_accounts',
            'email_sends',
            'omnichannel_accounts'
          ];

          const usage = {};
          for (const resource of resources) {
            try {
              usage[resource] = await getCurrentResourceCount(tenantId, resource);
            } catch (error) {
              logger.warn(`Could not get count for ${resource}`, { error: error.message });
              usage[resource] = 0;
            }
          }

          // Get plan name
          let planName = 'Plano Personalizado';
          if (limits.plan_id) {
            const [plans] = await pool.execute(
              'SELECT name FROM subscription_plans WHERE id = ?',
              [limits.plan_id]
            );
            if (plans.length > 0) {
              planName = plans[0].name;
            }
          }

          // Calculate percentages
          const percentages = {};
          for (const resource of resources) {
            const limitField = `max_${resource}`;
            const max = limits[limitField] || 0;
            const current = usage[resource] || 0;
            percentages[resource] = max > 0 ? Math.round((current / max) * 100) : 0;
          }

          return res.json({
            success: true,
            data: {
              plan: {
                id: limits.plan_id,
                name: planName
              },
              limits: {
                stores: limits.max_stores,
                users: limits.max_users,
                departments: limits.max_departments,
                contacts: limits.max_contacts,
                devices: limits.max_devices,
                conversations: limits.max_conversations,
                messages_per_month: limits.max_messages_per_month,
                faqs: limits.max_faqs,
                contact_groups: limits.max_contact_groups,
                invoices_per_month: limits.max_invoices_per_month,
                quotes_per_month: limits.max_quotes_per_month,
                widgets: limits.max_widgets,
                payment_links_per_month: limits.max_payment_links_per_month,
                email_accounts: limits.max_email_accounts,
                emails_per_month: limits.max_emails_per_month,
                omnichannel_accounts: limits.max_omnichannel_accounts
              },
              usage,
              percentages,
              features: {
                invoices: limits.invoices_enabled,
                quotes: limits.quotes_enabled,
                widgets: limits.widgets_enabled,
                payment_links: limits.payment_links_enabled,
                ai: limits.ai_enabled,
                woocommerce: limits.woocommerce_enabled
              }
            }
          });
        } catch (error) {
          logger.error('Error getting plan limits', {
            error: error.message,
            tenantId: req.tenantId
          });

          return res.status(500).json({
            success: false,
            error: 'Erro ao buscar limites do plano',
            message: error.message
          });
        }
      }

      /**
       * Get feature status with addon availability and admin contact
       * GET /api/tenant/feature-status/:feature
       */
      static async getFeatureStatus(req, res) {
        try {
          const tenantId = req.tenantId || req.user?.tenantId;
          const { feature } = req.params;

          logger.info('getFeatureStatus called', { tenantId, feature });

          if (!tenantId) {
            return res.status(400).json({
              success: false,
              error: 'Tenant context is required'
            });
          }

          const validFeatures = ['ai', 'woocommerce', 'mass_send', 'payments', 'invoices', 'quotes', 'widgets', 'payment_links', 'api_access'];
          if (!validFeatures.includes(feature)) {
            return res.status(400).json({
              success: false,
              error: 'Invalid feature'
            });
          }

          // Get plan limits
          let limits;
          try {
            limits = await getTenantPlanLimits(tenantId);
          } catch (limitsError) {
            logger.error('Error getting tenant plan limits', { error: limitsError.message, tenantId });
            // Return default disabled state if we can't get limits
            return res.json({
              success: true,
              data: {
                feature,
                enabled: false,
                canPurchase: false,
                addon: null,
                adminContact: {}
              }
            });
          }

          // Map feature names to enabled fields
          const featureMap = {
            ai: 'ai_enabled',
            woocommerce: 'woocommerce_enabled',
            mass_send: 'ai_enabled', // mass_send uses AI feature flag
            payments: 'payment_links_enabled',
            invoices: 'invoices_enabled',
            quotes: 'quotes_enabled',
            widgets: 'widgets_enabled',
            payment_links: 'payment_links_enabled',
            api_access: 'api_access_enabled'
          };

          const featureField = featureMap[feature];
          const isEnabled = limits[featureField] || false;

          logger.info('Feature status check', { feature, featureField, isEnabled, limits: JSON.stringify(limits) });

          // If feature is enabled, return success
          if (isEnabled) {
            return res.json({
              success: true,
              data: {
                feature,
                enabled: true
              }
            });
          }

          // Feature is disabled - check if addon is available for purchase
          // Map feature names to resource_key in plan_addons table
          const featureToResourceKey = {
            ai: 'ai',
            woocommerce: 'woocommerce',
            mass_send: 'mass_send',
            payments: 'payment_links',
            invoices: 'invoices',
            quotes: 'invoices',
            widgets: 'widgets',
            payment_links: 'payment_links',
            api_access: null
          };

          const resourceKey = featureToResourceKey[feature];

          let addonAvailable = false;
          let addon = null;
          if (resourceKey) {
            try {
              const [addons] = await pool.execute(
                `SELECT id, resource_name as name, unit_price, description
                 FROM plan_addons
                 WHERE resource_key = ? AND active = TRUE
                 LIMIT 1`,
                [resourceKey]
              );
              addonAvailable = addons.length > 0;
              addon = addonAvailable ? addons[0] : null;
            } catch (addonError) {
              logger.warn('Could not check addons table', { error: addonError.message });
            }
          }

          // Get superadmin contact info from system settings (with error handling)
          const adminContact = {};
          try {
            const [settings] = await pool.execute(
              `SELECT setting_key, setting_value
               FROM system_settings
               WHERE setting_key IN ('support_email', 'support_phone', 'company_name')`
            );
            settings.forEach(s => {
              adminContact[s.setting_key] = s.setting_value;
            });
          } catch (settingsError) {
            logger.warn('Could not get system settings', { error: settingsError.message });
          }

          return res.json({
            success: true,
            data: {
              feature,
              enabled: false,
              canPurchase: addonAvailable,
              addon: addon ? {
                id: addon.id,
                name: addon.name,
                price: addon.unit_price,
                description: addon.description
              } : null,
              adminContact: {
                email: adminContact.support_email || null,
                phone: adminContact.support_phone || null,
                company: adminContact.company_name || null
              }
            }
          });
        } catch (error) {
          logger.error('Error getting feature status', {
            error: error.message,
            feature: req.params.feature,
            tenantId: req.tenantId
          });

          return res.status(500).json({
            success: false,
            error: 'Error checking feature status',
            message: error.message
          });
        }
      }

      /**
       * Get specific resource usage
       * GET /api/tenant/plan-limits/:resource
       */
      static async getResourceUsage(req, res) {
        try {
          const tenantId = req.tenantId || req.user?.tenantId;
          const { resource } = req.params;

          if (!tenantId) {
            return res.status(400).json({
              success: false,
              error: 'Tenant context is required'
            });
          }

          const validResources = [
            'stores',
            'users',
            'departments',
            'contacts',
            'devices',
            'conversations',
            'faqs',
            'contact_groups',
            'invoices',
            'quotes',
            'widgets',
            'payment_links'
          ];

          if (!validResources.includes(resource)) {
            return res.status(400).json({
              success: false,
              error: 'Invalid resource'
            });
          }

          // Get plan limits
          const limits = await getTenantPlanLimits(tenantId);
          const limitField = `max_${resource}`;
          const maxAllowed = limits[limitField] || 0;

          // Get current usage
          const current = await getCurrentResourceCount(tenantId, resource);
          const percentage = maxAllowed > 0 ? Math.round((current / maxAllowed) * 100) : 0;
          const remaining = Math.max(0, maxAllowed - current);

          return res.json({
            success: true,
            data: {
              resource,
              current,
              max: maxAllowed,
              remaining,
              percentage,
              canCreate: current < maxAllowed
            }
          });
        } catch (error) {
          logger.error('Error getting resource usage', {
            error: error.message,
            resource: req.params.resource,
            tenantId: req.tenantId
          });

          return res.status(500).json({
            success: false,
            error: 'Erro ao buscar uso do recurso',
            message: error.message
          });
        }
      }
    }

    module.exports = PlanLimitsController;