# All files / middleware planLimits.js

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     /**
     * Plan Limits Middleware
     * Validates tenant resource limits based on their subscription plan
     *
     * @module middleware/planLimits
     */

    const { pool } = require('../config/database');
    const { logger } = require('../config/logger');

    /**
     * Get tenant plan limits
     * @param {number} tenantId - Tenant ID
     * @returns {Promise<Object>} Plan limits
     */
    async function getTenantPlanLimits(tenantId) {
      const [result] = await pool.execute(
        `SELECT
          t.id as tenant_id,
          t.plan_id,
          t.settings,
          COALESCE(t.max_stores, sp.max_stores) as max_stores,
          COALESCE(t.max_users, sp.max_users) as max_users,
          COALESCE(t.max_departments, sp.max_departments) as max_departments,
          COALESCE(t.max_contacts, sp.max_contacts) as max_contacts,
          COALESCE(t.max_devices, sp.max_devices) as max_devices,
          COALESCE(t.max_conversations, sp.max_conversations) as max_conversations,
          COALESCE(t.max_messages_per_month, sp.max_messages_per_month) as max_messages_per_month,
          COALESCE(t.max_faqs, sp.max_faqs, 10) as max_faqs,
          COALESCE(sp.max_contact_groups, 50) as max_contact_groups,
          COALESCE(sp.invoices_enabled, FALSE) as plan_invoices_enabled,
          COALESCE(t.max_invoices_per_month, sp.max_invoices_per_month, 0) as max_invoices_per_month,
          COALESCE(sp.quotes_enabled, FALSE) as plan_quotes_enabled,
          COALESCE(t.max_quotes_per_month, sp.max_quotes_per_month, 0) as max_quotes_per_month,
          COALESCE(sp.widgets_enabled, FALSE) as plan_widgets_enabled,
          COALESCE(t.max_widgets, sp.max_widgets, 0) as max_widgets,
          COALESCE(sp.payment_links_enabled, FALSE) as plan_payment_links_enabled,
          COALESCE(sp.api_access_enabled, FALSE) as plan_api_access_enabled,
          COALESCE(t.max_payment_links_per_month, sp.max_payment_links_per_month, 0) as max_payment_links_per_month,
          COALESCE(t.max_email_accounts, sp.max_email_accounts, 0) as max_email_accounts,
          COALESCE(t.max_emails_per_month, sp.max_emails_per_month, 0) as max_emails_per_month,
          COALESCE(t.max_omnichannel_accounts, sp.max_omnichannel_accounts, 0) as max_omnichannel_accounts,
          COALESCE(sp.ai_enabled, FALSE) as plan_ai_enabled,
          COALESCE(sp.woocommerce_enabled, FALSE) as plan_woocommerce_enabled
        FROM tenants t
        LEFT JOIN subscription_plans sp ON t.plan_id = sp.id
        WHERE t.id = ?`,
        [tenantId]
      );

      if (result.length === 0) {
        throw new Error('Tenant not found');
      }

      const row = result[0];

      // Parse tenant settings to check for addon-enabled features
      const normalizeBool = (value) => value === true || value === 1 || value === '1' || value === 'true';
      let tenantSettings = {};
      if (row.settings) {
        try {
          if (Buffer.isBuffer(row.settings)) {
            tenantSettings = JSON.parse(row.settings.toString('utf8'));
          } else if (typeof row.settings === 'string') {
            tenantSettings = JSON.parse(row.settings);
          } else {
            tenantSettings = row.settings;
          }
        } catch (e) {
          logger.warn('Failed to parse tenant settings', { tenantId, error: e.message });
        }
      }

      // Log for debugging
      logger.debug('Tenant plan limits check', {
        tenantId,
        planWidgetsEnabled: row.plan_widgets_enabled,
        tenantSettingsWidgetsEnabled: tenantSettings.widgets_enabled,
        maxWidgets: row.max_widgets,
        rawSettings: row.settings
      });

      // Features are enabled if either the plan has them OR the tenant has them via addons
      // Also check if max_widgets > 0 as an indicator that widgets were purchased
      const widgetsEnabled = normalizeBool(row.plan_widgets_enabled) ||
        normalizeBool(tenantSettings.widgets_enabled) ||
        (row.max_widgets && row.max_widgets > 0);

      const apiAccessEnabled = normalizeBool(row.plan_api_access_enabled) ||
        normalizeBool(tenantSettings.api_access_enabled) ||
        normalizeBool(tenantSettings.api_access) ||
        normalizeBool(tenantSettings.api_feature);

      let omnichannelAddon = 0;
      try {
        const [rows] = await pool.execute(
          `SELECT SUM(ta.quantity) as total
           FROM tenant_addons ta
           JOIN plan_addons pa ON pa.id = ta.addon_id
           WHERE ta.tenant_id = ?
             AND ta.status = 'active'
             AND pa.resource_key = ?`,
          [tenantId, 'omnichannel_accounts']
        );
        omnichannelAddon = parseInt(rows[0]?.total || 0, 10);
      } catch (error) {
        logger.warn('Addon quantity lookup failed', { tenantId, resourceKey: 'omnichannel_accounts', error: error.message });
      }

      const maxOmnichannelAccounts = (row.max_omnichannel_accounts || 0) + omnichannelAddon;

      return {
        tenant_id: row.tenant_id,
        plan_id: row.plan_id,
        max_stores: row.max_stores,
        max_users: row.max_users,
        max_departments: row.max_departments,
        max_contacts: row.max_contacts,
        max_devices: row.max_devices,
        max_conversations: row.max_conversations,
        max_messages_per_month: row.max_messages_per_month,
        max_faqs: row.max_faqs,
        max_contact_groups: row.max_contact_groups,
        max_invoices_per_month: row.max_invoices_per_month,
        max_quotes_per_month: row.max_quotes_per_month,
        max_widgets: row.max_widgets,
        max_payment_links_per_month: row.max_payment_links_per_month,
        max_email_accounts: row.max_email_accounts,
        max_emails_per_month: row.max_emails_per_month,
        max_omnichannel_accounts: maxOmnichannelAccounts,
        // Features: enabled if plan has it OR tenant has it via addon OR has limit > 0
        invoices_enabled: normalizeBool(row.plan_invoices_enabled) || normalizeBool(tenantSettings.invoices_enabled) || (row.max_invoices_per_month && row.max_invoices_per_month > 0),
        quotes_enabled: normalizeBool(row.plan_quotes_enabled) || normalizeBool(tenantSettings.quotes_enabled) || (row.max_quotes_per_month && row.max_quotes_per_month > 0),
        widgets_enabled: widgetsEnabled,
        payment_links_enabled: normalizeBool(row.plan_payment_links_enabled) || normalizeBool(tenantSettings.payment_links_enabled) || (row.max_payment_links_per_month && row.max_payment_links_per_month > 0),
        api_access_enabled: apiAccessEnabled,
        ai_enabled: normalizeBool(row.plan_ai_enabled) || normalizeBool(tenantSettings.ai_enabled),
        woocommerce_enabled: normalizeBool(row.plan_woocommerce_enabled) || normalizeBool(tenantSettings.woocommerce_enabled)
      };
    }

    /**
     * Get current resource count for tenant
     * @param {number} tenantId - Tenant ID
     * @param {string} resourceType - Type of resource (stores, users, departments, etc.)
     * @returns {Promise<number>} Current count
     */
    async function getCurrentResourceCount(tenantId, resourceType) {
      let query;

      switch (resourceType) {
        case 'stores':
          query = 'SELECT COUNT(*) as count FROM stores WHERE tenant_id = ?';
          break;
        case 'users':
          query = 'SELECT COUNT(*) as count FROM users WHERE tenant_id = ?';
          break;
        case 'departments':
          query = 'SELECT COUNT(*) as count FROM departments WHERE tenant_id = ?';
          break;
        case 'contacts':
          query = 'SELECT COUNT(*) as count FROM contacts WHERE tenant_id = ?';
          break;
        case 'devices':
          query = 'SELECT COUNT(*) as count FROM whatsapp_sessions WHERE tenant_id = ?';
          break;
        case 'conversations':
          query = 'SELECT COUNT(*) as count FROM conversations WHERE tenant_id = ?';
          break;
        case 'faqs':
          query = 'SELECT COUNT(*) as count FROM faqs WHERE tenant_id = ?';
          break;
        case 'contact_groups':
          query = 'SELECT COUNT(*) as count FROM contact_groups WHERE tenant_id = ?';
          break;
        case 'invoices':
          query = `SELECT COUNT(*) as count FROM invoices
                   WHERE tenant_id = ?
                   AND type = 'invoice'
                   AND MONTH(created_at) = MONTH(CURRENT_DATE())
                   AND YEAR(created_at) = YEAR(CURRENT_DATE())`;
          break;
        case 'quotes':
          query = `SELECT COUNT(*) as count FROM invoices
                   WHERE tenant_id = ?
                   AND type = 'quote'
                   AND MONTH(created_at) = MONTH(CURRENT_DATE())
                   AND YEAR(created_at) = YEAR(CURRENT_DATE())`;
          break;
        case 'widgets':
          query = 'SELECT COUNT(*) as count FROM chat_widgets WHERE tenant_id = ?';
          break;
        case 'payment_links':
          query = `SELECT COUNT(*) as count FROM payment_links
                   WHERE tenant_id = ?
                   AND MONTH(created_at) = MONTH(CURRENT_DATE())
                   AND YEAR(created_at) = YEAR(CURRENT_DATE())`;
          break;
        case 'email_accounts':
          query = 'SELECT COUNT(*) as count FROM email_accounts WHERE tenant_id = ?';
          break;
        case 'email_sends':
          query = `SELECT COUNT(*) as count FROM email_messages
                   WHERE tenant_id = ?
                     AND direction = 'sent'
                     AND MONTH(COALESCE(sent_at, created_at)) = MONTH(CURRENT_DATE())
                     AND YEAR(COALESCE(sent_at, created_at)) = YEAR(CURRENT_DATE())`;
          break;
        case 'omnichannel_accounts':
          query = 'SELECT COUNT(*) as count FROM omnichannel_accounts WHERE tenant_id = ?';
          break;
        default:
          throw new Error(`Unknown resource type: ${resourceType}`);
      }

      const [result] = await pool.execute(query, [tenantId]);
      return result[0].count;
    }

    /**
     * Check if tenant can create a new resource
     * @param {string} resourceType - Type of resource to check
     * @returns {Function} Express middleware
     */
    function checkResourceLimit(resourceType) {
      return async (req, res, next) => {
        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 count
          const currentCount = await getCurrentResourceCount(tenantId, resourceType);

          // Determine the limit field name
          const limitField = `max_${resourceType}`;
          const maxAllowed = limits[limitField];

          logger.info('Checking resource limit', {
            tenantId,
            resourceType,
            currentCount,
            maxAllowed,
            limitField
          });

          // Check if limit is reached (-1 means unlimited)
          if (maxAllowed !== -1 && currentCount >= maxAllowed) {
            logger.warn(`Resource limit reached for tenant ${tenantId}`, {
              resourceType,
              currentCount,
              maxAllowed,
              planId: limits.plan_id
            });

            return res.status(403).json({
              success: false,
              error: 'RESOURCE_LIMIT_REACHED',
              message: `Your plan allows a maximum of ${maxAllowed} ${resourceType}. You currently have ${currentCount}. Please upgrade your plan to create more.`,
              limit: {
                resource: resourceType,
                current: currentCount,
                max: maxAllowed
              }
            });
          }

          // Attach limits to request for reference
          req.planLimits = limits;
          req.currentResourceCount = currentCount;

          next();
        } catch (error) {
          logger.error('Error checking resource limit', {
            error: error.message,
            resourceType,
            tenantId: req.tenantId
          });

          // Block the request on error for security
          return res.status(500).json({
            success: false,
            error: 'Error checking resource limits',
            message: 'Unable to verify plan limits. Please try again.'
          });
        }
      };
    }

    /**
     * Check if a feature is enabled for tenant's plan
     * @param {string} featureName - Name of the feature to check
     * @returns {Function} Express middleware
     */
    function checkFeatureEnabled(featureName) {
      return async (req, res, next) => {
        try {
          const tenantId = req.tenantId || req.user?.tenantId;

          logger.info(`checkFeatureEnabled: Checking feature "${featureName}" for tenant ${tenantId}`);

          if (!tenantId) {
            logger.warn('checkFeatureEnabled: No tenant ID found');
            return res.status(400).json({
              success: false,
              error: 'Tenant context is required'
            });
          }

          const limits = await getTenantPlanLimits(tenantId);
          const featureField = `${featureName}_enabled`;

          logger.info(`checkFeatureEnabled: Feature field "${featureField}" = ${limits[featureField]}`, {
            tenantId,
            featureName,
            featureField,
            featureEnabled: limits[featureField],
            maxWidgets: limits.max_widgets
          });

          if (!limits[featureField]) {
            logger.warn(`Feature not enabled for tenant ${tenantId}`, {
              feature: featureName,
              planId: limits.plan_id,
              featureField,
              featureValue: limits[featureField]
            });

            return res.status(403).json({
              success: false,
              error: 'FEATURE_NOT_ENABLED',
              message: `The feature "${featureName}" is not available in your current plan. Please upgrade to access this feature.`,
              feature: featureName
            });
          }

          req.planLimits = limits;
          next();
        } catch (error) {
          logger.error('Error checking feature', {
            error: error.message,
            feature: featureName,
            tenantId: req.tenantId
          });

          // Don't block the request on error, just log it
          next();
        }
      };
    }

    /**
     * Middleware to get and attach plan limits to request
     * Useful for displaying current usage in UI
     */
    async function attachPlanLimits(req, res, next) {
      try {
        const tenantId = req.tenantId || req.user?.tenantId;

        if (!tenantId) {
          return next();
        }

        const limits = await getTenantPlanLimits(tenantId);
        req.planLimits = limits;

        next();
      } catch (error) {
        logger.error('Error attaching plan limits', {
          error: error.message,
          tenantId: req.tenantId
        });
        next();
      }
    }

    module.exports = {
      checkResourceLimit,
      checkFeatureEnabled,
      attachPlanLimits,
      getTenantPlanLimits,
      getCurrentResourceCount
    };