import { InjectQueue } from '@nestjs/bullmq';
import { Injectable } from '@nestjs/common';
import EventBus from '@server/utils/event-bus';
import { Queue } from 'bullmq';
import { ObjectType } from '@nice/common';
import { QueueJobType } from '../types';
@Injectable()
export class StatsService {
  constructor(@InjectQueue('general') private generalQueue: Queue) {
    EventBus.on('dataChanged', async ({ type, data }) => {
      const jobOptions = {
        removeOnComplete: true,
        jobId: this.generateJobId(type as ObjectType, data), // 使用唯一ID防止重复任务
      };
      switch (type) {
        case ObjectType.ENROLLMENT:
          await this.generalQueue.add(
            QueueJobType.UPDATE_STATS,
            {
              courseId: data.courseId,
              type: ObjectType.ENROLLMENT,
            },
            jobOptions,
          );
          break;

        case ObjectType.LECTURE:
          await this.generalQueue.add(
            QueueJobType.UPDATE_STATS,
            {
              sectionId: data.sectionId,
              courseId: data.courseId,
              type: ObjectType.LECTURE,
            },
            jobOptions,
          );
          break;

        case ObjectType.POST:
          if (data.courseId) {
            await this.generalQueue.add(
              QueueJobType.UPDATE_STATS,
              {
                courseId: data.courseId,
                type: ObjectType.POST,
              },
              jobOptions,
            );
          }
          break;
      }
    });
  }

  private generateJobId(type: ObjectType, data: any): string {
    // 根据类型和相关ID生成唯一的job标识
    switch (type) {
      case ObjectType.ENROLLMENT:
        return `stats_${type}_${data.courseId}`;
      case ObjectType.LECTURE:
        return `stats_${type}_${data.courseId}_${data.sectionId}`;
      case ObjectType.POST:
        return `stats_${type}_${data.courseId}`;
      default:
        return `stats_${type}_${Date.now()}`;
    }
  }
}