# All files / modules/notifications/controllers devices.controller.ts

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     import {
      Controller,
      Get,
      Post,
      Patch,
      Delete,
      Body,
      Param,
      UseGuards,
      HttpCode,
      HttpStatus,
    } from '@nestjs/common';
    import {
      ApiTags,
      ApiOperation,
      ApiResponse,
      ApiBearerAuth,
    } from '@nestjs/swagger';
    import { DevicesService, PushNotificationService } from '../services';
    import { RegisterDeviceDto, UpdateDeviceDto } from '../dto';

    // These decorators would come from your auth module
    // Adjust imports based on your actual auth implementation
    interface User {
      id: string;
      tenant_id: string;
    }

    // Placeholder decorators - replace with your actual implementations
    const CurrentUser = () => (target: any, key: string, index: number) => {};
    const CurrentTenant = () => (target: any, key: string, index: number) => {};
    const JwtAuthGuard = class {};
    const TenantGuard = class {};
    const Public = () => (target: any, key: string, descriptor: PropertyDescriptor) => {};

    @ApiTags('Notification Devices')
    @Controller('notifications/devices')
    export class DevicesController {
      constructor(
        private readonly devicesService: DevicesService,
        private readonly pushService: PushNotificationService,
      ) {}

      @Get('vapid-key')
      @ApiOperation({ summary: 'Get VAPID public key for push subscription' })
      @ApiResponse({ status: 200, description: 'Returns VAPID public key' })
      getVapidKey() {
        const vapidPublicKey = this.pushService.getVapidPublicKey();

        return {
          vapidPublicKey,
          isEnabled: this.pushService.isEnabled(),
        };
      }

      @Get()
      @UseGuards(JwtAuthGuard, TenantGuard)
      @ApiBearerAuth()
      @ApiOperation({ summary: 'List my registered devices' })
      @ApiResponse({ status: 200, description: 'Returns list of devices' })
      async getDevices(
        @CurrentUser() user: User,
        @CurrentTenant() tenantId: string,
      ) {
        // In actual implementation, get user and tenant from request
        const userId = (user as any)?.id || '';
        const tenant = tenantId || (user as any)?.tenant_id || '';

        return this.devicesService.findByUser(userId, tenant);
      }

      @Post()
      @UseGuards(JwtAuthGuard, TenantGuard)
      @ApiBearerAuth()
      @ApiOperation({ summary: 'Register device for push notifications' })
      @ApiResponse({ status: 201, description: 'Device registered' })
      @ApiResponse({ status: 400, description: 'Invalid subscription' })
      async registerDevice(
        @CurrentUser() user: User,
        @CurrentTenant() tenantId: string,
        @Body() dto: RegisterDeviceDto,
      ) {
        const userId = (user as any)?.id || '';
        const tenant = tenantId || (user as any)?.tenant_id || '';

        // Validate subscription format
        Iif (!this.pushService.validateSubscription(dto.deviceToken)) {
          return {
            success: false,
            error: 'Invalid push subscription format',
          };
        }

        const device = await this.devicesService.register(userId, tenant, dto);

        return {
          success: true,
          device: {
            id: device.id,
            device_type: device.device_type,
            device_name: device.device_name,
            browser: device.browser,
            os: device.os,
            created_at: device.created_at,
          },
        };
      }

      @Patch(':id')
      @UseGuards(JwtAuthGuard, TenantGuard)
      @ApiBearerAuth()
      @ApiOperation({ summary: 'Update device' })
      @ApiResponse({ status: 200, description: 'Device updated' })
      @ApiResponse({ status: 404, description: 'Device not found' })
      async updateDevice(
        @CurrentUser() user: User,
        @CurrentTenant() tenantId: string,
        @Param('id') deviceId: string,
        @Body() dto: UpdateDeviceDto,
      ) {
        const userId = (user as any)?.id || '';
        const tenant = tenantId || (user as any)?.tenant_id || '';

        return this.devicesService.update(deviceId, userId, tenant, dto);
      }

      @Delete(':id')
      @UseGuards(JwtAuthGuard, TenantGuard)
      @ApiBearerAuth()
      @HttpCode(HttpStatus.NO_CONTENT)
      @ApiOperation({ summary: 'Unregister device' })
      @ApiResponse({ status: 204, description: 'Device unregistered' })
      @ApiResponse({ status: 404, description: 'Device not found' })
      async unregisterDevice(
        @CurrentUser() user: User,
        @CurrentTenant() tenantId: string,
        @Param('id') deviceId: string,
      ) {
        const userId = (user as any)?.id || '';
        const tenant = tenantId || (user as any)?.tenant_id || '';

        await this.devicesService.unregister(deviceId, userId, tenant);
      }

      @Get('stats')
      @UseGuards(JwtAuthGuard, TenantGuard)
      @ApiBearerAuth()
      @ApiOperation({ summary: 'Get device stats for current user' })
      @ApiResponse({ status: 200, description: 'Returns device statistics' })
      async getStats(
        @CurrentUser() user: User,
        @CurrentTenant() tenantId: string,
      ) {
        const userId = (user as any)?.id || '';
        const tenant = tenantId || (user as any)?.tenant_id || '';

        const activeCount = await this.devicesService.countActiveDevices(
          userId,
          tenant,
        );
        const devices = await this.devicesService.findByUser(userId, tenant);

        return {
          total: devices.length,
          active: activeCount,
          inactive: devices.length - activeCount,
          byType: {
            web: devices.filter((d) => d.device_type === 'web').length,
            mobile: devices.filter((d) => d.device_type === 'mobile').length,
            desktop: devices.filter((d) => d.device_type === 'desktop').length,
          },
        };
      }
    }