import { Injectable } from '@nestjs/common';

@Injectable()
export class QueueService {
  private queues: Map<string, any[]> = new Map();

  add(queueName: string, data: any) {
    if (!this.queues.has(queueName)) {
      this.queues.set(queueName, []);
    }
    this.queues.get(queueName)!.push(data);
  }

  async processNext(queueName: string): Promise<any | null> {
    const queue = this.queues.get(queueName);
    if (!queue || queue.length === 0) return null;
    return queue.shift();
  }

  getQueueNames(): string[] {
    return Array.from(this.queues.keys());
  }
}