import { Queue, Worker, Job } from "bullmq";
import { Redis } from "ioredis";

const redisUrl = process.env.REDIS_URL || "redis://localhost:6379";
const { host, port } = new URL(redisUrl);
const connection = new Redis({
  host,
  port: parseInt(port, 10),
  retryStrategy: (times: number) => {
    const maxAttempts = parseInt(process.env.VOICEPRINT_MAX_RETRIES || "5", 10);
    const delay = Math.min(times * 1000, 5000);
    return times < maxAttempts ? delay : null;
  },
});

const analysisQueue = new Queue("voiceprint-analysis", { connection });

const VOICEPRINT_CONFIG = {
  concurrency: parseInt(process.env.VOICEPRINT_CONCURRENCY || "2", 10),
  maxAttempts: parseInt(process.env.VOICEPRINT_MAX_ATTEMPTS || "3", 10),
  defaultBackoffDelay: parseInt(process.env.VOICEPRINT_BACKOFF_DELAY || "5000", 10),
};

export function createAnalysisWorker(): Worker {
  const analysisWorker = new Worker(
    "voiceprint-analysis",
    async (job: Job) => {
      const { userId, audioBuffer, sampleRate, analysisType } = job.data;
      
      // Import AnalysisService within job handler to avoid circular deps
      const { analysisService: { analyze } } = await import("@shieldai/voiceprint");
      
      const decodedAudio = Buffer.from(audioBuffer, "base64");
      const result = await analyze(userId, decodedAudio, {
        enrollmentId: undefined,
        audioUrl: undefined,
      });
      
      return { jobId: result.id, completedAt: new Date().toISOString() };
    },
    {
      connection,
      concurrency: VOICEPRINT_CONFIG.concurrency,
      removeOnComplete: {
        age: 7 * 24 * 60 * 60 * 1000, // 7 days
        count: 1000,
      },
      removeOnFail: {
        age: 30 * 24 * 60 * 60 * 1000, // 30 days
        count: 500,
      },
    }
  );

  analysisWorker.on("completed", (job: Job | undefined) => {
    if (job) {
      console.log(`[VoicePrint] Job ${job.id} completed: ${JSON.stringify(job.returnvalue)}`);
    }
  });

  analysisWorker.on("failed", (job: Job | undefined, err: Error) => {
    if (job) {
      console.error(`[VoicePrint] Job ${job.id} failed: ${err.message}`);
    }
  });

  analysisWorker.on("error", (err: Error) => {
    console.error("[VoicePrint] Worker error:", err.message);
  });

  return analysisWorker;
}

export async function addAnalysisJob(
  userId: string,
  audioBuffer: Buffer,
  sampleRate?: number,
  analysisType?: string
) {
  return analysisQueue.add("analyze", {
    userId,
    audioBuffer: audioBuffer.toString("base64"),
    sampleRate,
    analysisType,
  }, {
    attempts: 3,
    backoff: { type: "exponential", delay: 5000 },
    jobId: `vp-${userId}-${Date.now()}`,
  });
}