import { Injectable } from "@nestjs/common";
import { Queue } from "bullmq";

@Injectable()
export class VariantsQueue {
    private queue: Queue;

    constructor() {
        const name = `${process.env.BULL_PREFIX || 'attachments'}:variants`;
        this.queue = new Queue(name, { connection: { url: process.env.REDIS_URL! } });
    }

    enqueue(attachment_id: number, mime: string) {
        if (!mime.startsWith('image/')) return Promise.resolve();
        return this.queue.add(
            'generate',
            { attachment_id, mime },
            { attempts: 3, backoff: { type: 'exponential', delay: 2000 } }
        );
    }
}