# All files / modules/notifications/gateways notifications.gateway.ts

100% Statements 89/89
100% Branches 32/32
100% Functions 15/15
100% Lines 87/87

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     import {
      WebSocketGateway,
      WebSocketServer,
      SubscribeMessage,
      OnGatewayConnection,
      OnGatewayDisconnect,
      MessageBody,
      ConnectedSocket,
    } from '@nestjs/websockets';
    import { Server, Socket } from 'socket.io';
    import { Logger, UseGuards } from '@nestjs/common';
    import { Notification } from '../entities';

    interface AuthenticatedSocket extends Socket {
      userId?: string;
      tenantId?: string;
    }

    @WebSocketGateway({
      namespace: '/notifications',
      cors: {
        origin: process.env.FRONTEND_URL || '*',
        credentials: true,
      },
    })
    export class NotificationsGateway
      implements OnGatewayConnection, OnGatewayDisconnect
    {
      @WebSocketServer()
      server: Server;

      private readonly logger = new Logger(NotificationsGateway.name);

      // Map: "tenantId:userId" -> Set of socket IDs
      private userSockets = new Map<string, Set<string>>();

      // Map: socket ID -> user key
      private socketUsers = new Map<string, string>();

      handleConnection(client: AuthenticatedSocket) {
        try {
          const userId = this.extractUserId(client);
          const tenantId = this.extractTenantId(client);

          if (!userId || !tenantId) {
            this.logger.warn(`Client ${client.id} connected without auth, disconnecting`);
            client.disconnect();
            return;
          }

          client.userId = userId;
          client.tenantId = tenantId;

          const userKey = `${tenantId}:${userId}`;

          // Add to user sockets map
          if (!this.userSockets.has(userKey)) {
            this.userSockets.set(userKey, new Set());
          }
          this.userSockets.get(userKey)!.add(client.id);

          // Add to socket users map
          this.socketUsers.set(client.id, userKey);

          // Join rooms
          client.join(`tenant:${tenantId}`);
          client.join(`user:${userId}`);

          this.logger.debug(
            `User ${userId} connected from tenant ${tenantId} (socket: ${client.id})`,
          );

          // Send connection confirmation
          client.emit('connected', {
            socketId: client.id,
            userId,
            tenantId,
          });
        } catch (error) {
          this.logger.error(`Connection error: ${error.message}`);
          client.disconnect();
        }
      }

      handleDisconnect(client: AuthenticatedSocket) {
        const userKey = this.socketUsers.get(client.id);

        if (userKey) {
          const sockets = this.userSockets.get(userKey);
          if (sockets) {
            sockets.delete(client.id);
            if (sockets.size === 0) {
              this.userSockets.delete(userKey);
            }
          }
          this.socketUsers.delete(client.id);
        }

        this.logger.debug(`Client ${client.id} disconnected`);
      }

      /**
       * Emit notification to a specific user
       */
      async emitToUser(
        tenantId: string,
        userId: string,
        notification: Partial<Notification>,
      ): Promise<number> {
        const userKey = `${tenantId}:${userId}`;
        const socketIds = this.userSockets.get(userKey);

        if (!socketIds || socketIds.size === 0) {
          this.logger.debug(`No active sockets for user ${userId}`);
          return 0;
        }

        for (const socketId of socketIds) {
          this.server.to(socketId).emit('notification:created', notification);
        }

        this.logger.debug(
          `Emitted notification to user ${userId} (${socketIds.size} sockets)`,
        );

        return socketIds.size;
      }

      /**
       * Emit to all users in a tenant
       */
      async emitToTenant(
        tenantId: string,
        event: string,
        data: any,
      ): Promise<void> {
        this.server.to(`tenant:${tenantId}`).emit(event, data);
        this.logger.debug(`Emitted ${event} to tenant ${tenantId}`);
      }

      /**
       * Emit notification read event to sync across devices
       */
      @SubscribeMessage('notification:read')
      handleMarkAsRead(
        @ConnectedSocket() client: AuthenticatedSocket,
        @MessageBody() payload: { notificationId: string },
      ): void {
        if (!client.userId || !client.tenantId) {
          return;
        }

        const userKey = `${client.tenantId}:${client.userId}`;
        const socketIds = this.userSockets.get(userKey);

        if (socketIds) {
          // Broadcast to all other sockets of the same user
          for (const socketId of socketIds) {
            if (socketId !== client.id) {
              this.server.to(socketId).emit('notification:read', payload);
            }
          }
        }

        this.logger.debug(
          `User ${client.userId} marked notification ${payload.notificationId} as read`,
        );
      }

      /**
       * Handle mark all as read
       */
      @SubscribeMessage('notification:read-all')
      handleMarkAllAsRead(@ConnectedSocket() client: AuthenticatedSocket): void {
        if (!client.userId || !client.tenantId) {
          return;
        }

        const userKey = `${client.tenantId}:${client.userId}`;
        const socketIds = this.userSockets.get(userKey);

        if (socketIds) {
          for (const socketId of socketIds) {
            if (socketId !== client.id) {
              this.server.to(socketId).emit('notification:read-all', {});
            }
          }
        }

        this.logger.debug(`User ${client.userId} marked all notifications as read`);
      }

      /**
       * Handle client requesting unread count
       */
      @SubscribeMessage('notification:get-unread-count')
      handleGetUnreadCount(
        @ConnectedSocket() client: AuthenticatedSocket,
      ): { event: string } {
        // The actual count will be fetched by the service and emitted back
        return { event: 'notification:unread-count-requested' };
      }

      /**
       * Emit unread count update to user
       */
      async emitUnreadCount(
        tenantId: string,
        userId: string,
        count: number,
      ): Promise<void> {
        const userKey = `${tenantId}:${userId}`;
        const socketIds = this.userSockets.get(userKey);

        if (socketIds) {
          for (const socketId of socketIds) {
            this.server.to(socketId).emit('notification:unread-count', { count });
          }
        }
      }

      /**
       * Emit notification deleted event
       */
      async emitNotificationDeleted(
        tenantId: string,
        userId: string,
        notificationId: string,
      ): Promise<void> {
        const userKey = `${tenantId}:${userId}`;
        const socketIds = this.userSockets.get(userKey);

        if (socketIds) {
          for (const socketId of socketIds) {
            this.server
              .to(socketId)
              .emit('notification:deleted', { notificationId });
          }
        }
      }

      /**
       * Get connected users count
       */
      getConnectedUsersCount(): number {
        return this.userSockets.size;
      }

      /**
       * Get total socket connections
       */
      getTotalConnections(): number {
        return this.socketUsers.size;
      }

      /**
       * Check if user is online
       */
      isUserOnline(tenantId: string, userId: string): boolean {
        const userKey = `${tenantId}:${userId}`;
        const sockets = this.userSockets.get(userKey);
        return sockets !== undefined && sockets.size > 0;
      }

      private extractUserId(client: Socket): string | null {
        return (
          (client.handshake.auth?.userId as string) ||
          (client.handshake.query?.userId as string) ||
          null
        );
      }

      private extractTenantId(client: Socket): string | null {
        return (
          (client.handshake.auth?.tenantId as string) ||
          (client.handshake.query?.tenantId as string) ||
          null
        );
      }
    }