# All files / modules/webhooks/services webhook.service.ts

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     import { Injectable, NotFoundException, BadRequestException, Logger } from '@nestjs/common';
    import { InjectRepository } from '@nestjs/typeorm';
    import { Repository } from 'typeorm';
    import { InjectQueue } from '@nestjs/bullmq';
    import { Queue } from 'bullmq';
    import * as crypto from 'crypto';

    import { WebhookEntity, WebhookDeliveryEntity, DeliveryStatus } from '../entities';
    import {
      CreateWebhookDto,
      UpdateWebhookDto,
      WebhookResponseDto,
      DeliveryResponseDto,
      TestWebhookDto,
      ListDeliveriesQueryDto,
      PaginatedDeliveriesDto,
      WebhookStatsDto,
      WEBHOOK_EVENTS,
    } from '../dto';

    @Injectable()
    export class WebhookService {
      private readonly logger = new Logger(WebhookService.name);

      constructor(
        @InjectRepository(WebhookEntity)
        private readonly webhookRepo: Repository<WebhookEntity>,
        @InjectRepository(WebhookDeliveryEntity)
        private readonly deliveryRepo: Repository<WebhookDeliveryEntity>,
        @InjectQueue('webhooks')
        private readonly webhookQueue: Queue,
      ) {}

      // Generate a secure random secret
      private generateSecret(): string {
        return `whsec_${crypto.randomBytes(32).toString('hex')}`;
      }

      // Sign a payload with HMAC-SHA256
      signPayload(payload: object, secret: string): string {
        const timestamp = Date.now();
        const body = JSON.stringify(payload);
        const signature = crypto
          .createHmac('sha256', secret)
          .update(`${timestamp}.${body}`)
          .digest('hex');

        return `t=${timestamp},v1=${signature}`;
      }

      // Create a new webhook
      async create(tenantId: string, userId: string, dto: CreateWebhookDto): Promise<WebhookResponseDto> {
        // Validate events
        const invalidEvents = dto.events.filter((e) => !WEBHOOK_EVENTS.includes(e as any));
        if (invalidEvents.length > 0) {
          throw new BadRequestException(`Invalid events: ${invalidEvents.join(', ')}`);
        }

        const webhook = this.webhookRepo.create({
          tenantId,
          name: dto.name,
          description: dto.description,
          url: dto.url,
          events: dto.events,
          headers: dto.headers || {},
          secret: this.generateSecret(),
          createdBy: userId,
        });

        const saved = await this.webhookRepo.save(webhook);
        this.logger.log(`Webhook created: ${saved.id} for tenant ${tenantId}`);

        return this.toResponse(saved, true); // Include secret on creation
      }

      // Get all webhooks for a tenant
      async findAll(tenantId: string): Promise<WebhookResponseDto[]> {
        const webhooks = await this.webhookRepo.find({
          where: { tenantId },
          order: { createdAt: 'DESC' },
        });

        return Promise.all(webhooks.map((w) => this.toResponse(w)));
      }

      // Get a single webhook
      async findOne(tenantId: string, webhookId: string): Promise<WebhookResponseDto> {
        const webhook = await this.webhookRepo.findOne({
          where: { id: webhookId, tenantId },
        });

        if (!webhook) {
          throw new NotFoundException('Webhook not found');
        }

        return this.toResponse(webhook);
      }

      // Update a webhook
      async update(
        tenantId: string,
        webhookId: string,
        dto: UpdateWebhookDto,
      ): Promise<WebhookResponseDto> {
        const webhook = await this.webhookRepo.findOne({
          where: { id: webhookId, tenantId },
        });

        if (!webhook) {
          throw new NotFoundException('Webhook not found');
        }

        // Validate events if provided
        if (dto.events) {
          const invalidEvents = dto.events.filter((e) => !WEBHOOK_EVENTS.includes(e as any));
          if (invalidEvents.length > 0) {
            throw new BadRequestException(`Invalid events: ${invalidEvents.join(', ')}`);
          }
        }

        Object.assign(webhook, {
          name: dto.name ?? webhook.name,
          description: dto.description ?? webhook.description,
          url: dto.url ?? webhook.url,
          events: dto.events ?? webhook.events,
          headers: dto.headers ?? webhook.headers,
          isActive: dto.isActive ?? webhook.isActive,
        });

        const saved = await this.webhookRepo.save(webhook);
        this.logger.log(`Webhook updated: ${saved.id}`);

        return this.toResponse(saved);
      }

      // Delete a webhook
      async remove(tenantId: string, webhookId: string): Promise<void> {
        const webhook = await this.webhookRepo.findOne({
          where: { id: webhookId, tenantId },
        });

        if (!webhook) {
          throw new NotFoundException('Webhook not found');
        }

        await this.webhookRepo.remove(webhook);
        this.logger.log(`Webhook deleted: ${webhookId}`);
      }

      // Regenerate webhook secret
      async regenerateSecret(tenantId: string, webhookId: string): Promise<{ secret: string }> {
        const webhook = await this.webhookRepo.findOne({
          where: { id: webhookId, tenantId },
        });

        if (!webhook) {
          throw new NotFoundException('Webhook not found');
        }

        webhook.secret = this.generateSecret();
        await this.webhookRepo.save(webhook);

        return { secret: webhook.secret };
      }

      // Test a webhook
      async testWebhook(
        tenantId: string,
        webhookId: string,
        dto: TestWebhookDto,
      ): Promise<DeliveryResponseDto> {
        const webhook = await this.webhookRepo.findOne({
          where: { id: webhookId, tenantId },
        });

        Iif (!webhook) {
          throw new NotFoundException('Webhook not found');
        }

        const eventType = dto.eventType || 'test.ping';
        const payload = dto.payload || {
          type: 'test.ping',
          timestamp: new Date().toISOString(),
          data: { message: 'This is a test webhook delivery' },
        };

        // Create a delivery record
        const delivery = this.deliveryRepo.create({
          webhookId: webhook.id,
          tenantId,
          eventType,
          payload,
          status: DeliveryStatus.PENDING,
        });

        const saved = await this.deliveryRepo.save(delivery);

        // Queue for immediate delivery
        await this.webhookQueue.add(
          'deliver',
          {
            deliveryId: saved.id,
            webhookId: webhook.id,
            url: webhook.url,
            secret: webhook.secret,
            headers: webhook.headers,
            eventType,
            payload,
          },
          { priority: 1 }, // High priority for tests
        );

        this.logger.log(`Test webhook queued: ${saved.id}`);
        return this.toDeliveryResponse(saved);
      }

      // Get deliveries for a webhook
      async getDeliveries(
        tenantId: string,
        webhookId: string,
        query: ListDeliveriesQueryDto,
      ): Promise<PaginatedDeliveriesDto> {
        const webhook = await this.webhookRepo.findOne({
          where: { id: webhookId, tenantId },
        });

        if (!webhook) {
          throw new NotFoundException('Webhook not found');
        }

        const page = query.page || 1;
        const limit = Math.min(query.limit || 20, 100);
        const skip = (page - 1) * limit;

        const qb = this.deliveryRepo
          .createQueryBuilder('d')
          .where('d.webhook_id = :webhookId', { webhookId })
          .andWhere('d.tenant_id = :tenantId', { tenantId });

        if (query.status) {
          qb.andWhere('d.status = :status', { status: query.status });
        }

        Iif (query.eventType) {
          qb.andWhere('d.event_type = :eventType', { eventType: query.eventType });
        }

        qb.orderBy('d.created_at', 'DESC').skip(skip).take(limit);

        const [items, total] = await qb.getManyAndCount();

        return {
          items: items.map((d) => this.toDeliveryResponse(d)),
          total,
          page,
          limit,
          totalPages: Math.ceil(total / limit),
        };
      }

      // Retry a failed delivery
      async retryDelivery(
        tenantId: string,
        webhookId: string,
        deliveryId: string,
      ): Promise<DeliveryResponseDto> {
        const delivery = await this.deliveryRepo.findOne({
          where: { id: deliveryId, webhookId, tenantId },
          relations: ['webhook'],
        });

        if (!delivery) {
          throw new NotFoundException('Delivery not found');
        }

        if (delivery.status !== DeliveryStatus.FAILED) {
          throw new BadRequestException('Only failed deliveries can be retried');
        }

        // Reset for retry
        delivery.status = DeliveryStatus.RETRYING;
        delivery.attempt = 1;
        delivery.nextRetryAt = new Date();
        await this.deliveryRepo.save(delivery);

        // Queue for delivery
        await this.webhookQueue.add('deliver', {
          deliveryId: delivery.id,
          webhookId: delivery.webhookId,
          url: delivery.webhook.url,
          secret: delivery.webhook.secret,
          headers: delivery.webhook.headers,
          eventType: delivery.eventType,
          payload: delivery.payload,
        });

        this.logger.log(`Delivery retry queued: ${delivery.id}`);
        return this.toDeliveryResponse(delivery);
      }

      // Get webhook stats
      async getStats(webhookId: string): Promise<WebhookStatsDto> {
        const result = await this.deliveryRepo
          .createQueryBuilder('d')
          .select([
            'COUNT(*)::int as "totalDeliveries"',
            'COUNT(*) FILTER (WHERE d.status = :delivered)::int as "successfulDeliveries"',
            'COUNT(*) FILTER (WHERE d.status = :failed)::int as "failedDeliveries"',
            'COUNT(*) FILTER (WHERE d.status IN (:...pending))::int as "pendingDeliveries"',
            'MAX(d.delivered_at) as "lastDeliveryAt"',
          ])
          .where('d.webhook_id = :webhookId', { webhookId })
          .setParameters({
            delivered: DeliveryStatus.DELIVERED,
            failed: DeliveryStatus.FAILED,
            pending: [DeliveryStatus.PENDING, DeliveryStatus.RETRYING],
          })
          .getRawOne();

        const total = result.successfulDeliveries + result.failedDeliveries;
        const successRate = total > 0 ? Math.round((result.successfulDeliveries / total) * 100) : 0;

        return {
          ...result,
          successRate,
        };
      }

      // Dispatch an event to all subscribed webhooks
      async dispatch(tenantId: string, eventType: string, data: Record<string, any>): Promise<void> {
        const webhooks = await this.webhookRepo.find({
          where: { tenantId, isActive: true },
        });

        const subscribedWebhooks = webhooks.filter((w) => w.events.includes(eventType));

        if (subscribedWebhooks.length === 0) {
          return;
        }

        const payload = {
          type: eventType,
          timestamp: new Date().toISOString(),
          data,
        };

        for (const webhook of subscribedWebhooks) {
          const delivery = this.deliveryRepo.create({
            webhookId: webhook.id,
            tenantId,
            eventType,
            payload,
            status: DeliveryStatus.PENDING,
          });

          const saved = await this.deliveryRepo.save(delivery);

          await this.webhookQueue.add('deliver', {
            deliveryId: saved.id,
            webhookId: webhook.id,
            url: webhook.url,
            secret: webhook.secret,
            headers: webhook.headers,
            eventType,
            payload,
          });
        }

        this.logger.log(
          `Event ${eventType} dispatched to ${subscribedWebhooks.length} webhooks for tenant ${tenantId}`,
        );
      }

      // Get available events
      getAvailableEvents(): { name: string; description: string }[] {
        return [
          { name: 'user.created', description: 'A new user was created' },
          { name: 'user.updated', description: 'A user was updated' },
          { name: 'user.deleted', description: 'A user was deleted' },
          { name: 'subscription.created', description: 'A new subscription was created' },
          { name: 'subscription.updated', description: 'A subscription was updated' },
          { name: 'subscription.cancelled', description: 'A subscription was cancelled' },
          { name: 'invoice.paid', description: 'An invoice was paid' },
          { name: 'invoice.failed', description: 'An invoice payment failed' },
          { name: 'file.uploaded', description: 'A file was uploaded' },
          { name: 'file.deleted', description: 'A file was deleted' },
          { name: 'tenant.updated', description: 'Tenant settings were updated' },
        ];
      }

      // Transform entity to response DTO
      private async toResponse(webhook: WebhookEntity, includeSecret = false): Promise<WebhookResponseDto> {
        const stats = await this.getStats(webhook.id);

        return {
          id: webhook.id,
          name: webhook.name,
          description: webhook.description,
          url: webhook.url,
          events: webhook.events,
          headers: webhook.headers,
          isActive: webhook.isActive,
          createdAt: webhook.createdAt,
          updatedAt: webhook.updatedAt,
          ...(includeSecret && { secret: webhook.secret }),
          stats,
        };
      }

      private toDeliveryResponse(delivery: WebhookDeliveryEntity): DeliveryResponseDto {
        return {
          id: delivery.id,
          webhookId: delivery.webhookId,
          eventType: delivery.eventType,
          payload: delivery.payload,
          status: delivery.status,
          responseStatus: delivery.responseStatus,
          responseBody: delivery.responseBody,
          attempt: delivery.attempt,
          maxAttempts: delivery.maxAttempts,
          nextRetryAt: delivery.nextRetryAt,
          lastError: delivery.lastError,
          createdAt: delivery.createdAt,
          deliveredAt: delivery.deliveredAt,
        };
      }
    }