import { ConflictException, Injectable } from '@nestjs/common';
import { AuthUser } from '../../common/current-user.decorator';
import { RedisService } from '../redis/redis.service';
import { AlarmsService } from '../alarms/alarms.service';

@Injectable()
export class AlarmIngestionService {
  constructor(
    private readonly redisService: RedisService,
    private readonly alarmsService: AlarmsService,
  ) {}

  async receive(user: AuthUser, dto: any) {
    const idempotentKey = `alarm:ingestion:${user.sub}:${dto.sourceAlarmId}`;
    const redis = this.redisService.client;
    await redis.connect().catch(() => undefined);
    const created = await redis.set(idempotentKey, '1', 'EX', 3600, 'NX');
    if (!created) {
      throw new ConflictException('重复报警已忽略');
    }

    try {
      return await this.alarmsService.createFromIngestion(user, dto);
    } catch (e) {
      await redis.del(idempotentKey).catch(() => undefined);
      throw e;
    }
  }
}