import { Queue, type ConnectionOptions } from 'bullmq';

const redisUrl = process.env.REDIS_URL!;

// 10 queues matching 11-REALTIME-AND-BACKGROUND-JOBS.md Section 3.1
const QUEUE_CONFIGS = {
  email:         { concurrency: 5,  maxAttempts: 5 },
  documents:     { concurrency: 3,  maxAttempts: 5 },
  notifications: { concurrency: 10, maxAttempts: 3 },
  import:        { concurrency: 1,  maxAttempts: 1 },
  export:        { concurrency: 2,  maxAttempts: 3 },
  reports:       { concurrency: 1,  maxAttempts: 3 },
  webhooks:      { concurrency: 5,  maxAttempts: 3 },
  maintenance:   { concurrency: 1,  maxAttempts: 3 },
  ai:            { concurrency: 2,  maxAttempts: 3 },
  bulk:          { concurrency: 2,  maxAttempts: 3 },
} as const;

export type QueueName = keyof typeof QUEUE_CONFIGS;

const queues = new Map<QueueName, Queue>();

export function getQueue(name: QueueName): Queue {
  let queue = queues.get(name);
  if (!queue) {
    queue = new Queue(name, {
      connection: { url: redisUrl } as ConnectionOptions,
      defaultJobOptions: {
        attempts: QUEUE_CONFIGS[name].maxAttempts,
        backoff: { type: 'exponential', delay: 1000 },
        removeOnComplete: { age: 24 * 3600 },       // keep completed jobs 24 hours
        removeOnFail: { age: 7 * 24 * 3600 },        // keep failed jobs 7 days
      },
    });
    queues.set(name, queue);
  }
  return queue;
}

export { QUEUE_CONFIGS };