import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
import { InMemoryQueue, setQueue, resetQueue } from "./queue";
import { processJob, startWorker, stopWorker } from "./worker";
import { setHandlers } from "./handlers";
import type { Job } from "./queue";

describe("worker", () => {
  let queue: InMemoryQueue;

  beforeEach(() => {
    queue = new InMemoryQueue();
    setQueue(queue);
    vi.useFakeTimers();
  });

  afterEach(() => {
    vi.useRealTimers();
    resetQueue();
  });

  describe("processJob", () => {
    it("dispatches darkwatch.scan to correct handler", async () => {
      const handler = vi.fn().mockResolvedValue(undefined);
      setHandlers({ "darkwatch.scan": handler });

      const job = await queue.enqueue("darkwatch.scan", { userId: "u1", subscriptionId: "s1" });

      await processJob(job);

      expect(handler).toHaveBeenCalledWith({ userId: "u1", subscriptionId: "s1" });
    });

    it("dispatches hometitle.scan to correct handler", async () => {
      const handler = vi.fn().mockResolvedValue(undefined);
      setHandlers({ "hometitle.scan": handler });

      const job = await queue.enqueue("hometitle.scan", { userId: "u1", subscriptionId: "s1" });

      await processJob(job);

      expect(handler).toHaveBeenCalledWith({ userId: "u1", subscriptionId: "s1" });
    });

    it("dispatches reports.generate to correct handler", async () => {
      const handler = vi.fn().mockResolvedValue(undefined);
      setHandlers({ "reports.generate": handler });

      const job = await queue.enqueue("reports.generate", { userId: "u1", reportType: "MONTHLY_PLUS" });

      await processJob(job);

      expect(handler).toHaveBeenCalledWith({ userId: "u1", reportType: "MONTHLY_PLUS" });
    });

    it("dispatches notifications.send to correct handler", async () => {
      const handler = vi.fn().mockResolvedValue(undefined);
      setHandlers({ "notifications.send": handler });

      const job = await queue.enqueue("notifications.send", { userId: "u1", channel: "email" });

      await processJob(job);

      expect(handler).toHaveBeenCalledWith({ userId: "u1", channel: "email" });
    });

    it("dispatches removebrokers.process to correct handler", async () => {
      const handler = vi.fn().mockResolvedValue(undefined);
      setHandlers({ "removebrokers.process": handler });

      const job = await queue.enqueue("removebrokers.process", {});

      await processJob(job);

      expect(handler).toHaveBeenCalledWith({});
    });

    it("dispatches voiceprint.batch to correct handler", async () => {
      const handler = vi.fn().mockResolvedValue(undefined);
      setHandlers({ "voiceprint.batch": handler });

      const job = await queue.enqueue("voiceprint.batch", { userId: "u1" });

      await processJob(job);

      expect(handler).toHaveBeenCalledWith({ userId: "u1" });
    });

    it("marks job as completed on success", async () => {
      setHandlers({ "darkwatch.scan": vi.fn().mockResolvedValue(undefined) });

      const job = await queue.enqueue("darkwatch.scan", { userId: "u1", subscriptionId: "s1" });
      await processJob(job);

      const updated = await queue.getJob(job.id);
      expect(updated?.status).toBe("completed");
    });

    it("schedules retry on failure with exponential backoff", async () => {
      const handler = vi.fn().mockRejectedValue(new Error("Scan failed"));
      setHandlers({ "darkwatch.scan": handler });

      const job = await queue.enqueue("darkwatch.scan", { userId: "u1", subscriptionId: "s1" });
      await processJob(job);

      // After first retry, job should be pending with attempt 1
      const updated = await queue.getJob(job.id);
      expect(updated?.attempts).toBe(1);
      expect(updated?.status).toBe("pending");

      // Retry delay should be 60s for first retry
      expect(handler).toHaveBeenCalledTimes(1);
    });

    it("marks as failed after exhausting retries", async () => {
      const handler = vi.fn().mockRejectedValue(new Error("Final failure"));
      setHandlers({ "darkwatch.scan": handler });

      const job = await queue.enqueue("darkwatch.scan", { userId: "u1", subscriptionId: "s1" }, { maxAttempts: 2 });

      // First attempt - retries (schedules retry)
      await processJob(job);
      expect(handler).toHaveBeenCalledTimes(1);
      expect(job.attempts).toBe(1);

      // Advance past the retry delay so the retry is available
      vi.advanceTimersByTime(60001);

      // Second attempt - dequeue and process
      const retried = await queue.dequeue();
      expect(retried).not.toBeNull();
      if (retried) {
        await processJob(retried);
      }

      // After max attempts, job should be failed
      const failed = await queue.getJob(job.id);
      expect(failed?.status).toBe("failed");
      expect(failed?.error).toBe("Final failure");
    });
  });

  describe("startWorker / stopWorker", () => {
    it("polls queue and processes jobs", async () => {
      const handler = vi.fn().mockResolvedValue(undefined);
      setHandlers({ "darkwatch.scan": handler });

      await queue.enqueue("darkwatch.scan", { userId: "u1", subscriptionId: "s1" });

      startWorker({ pollInterval: 50 });
      await vi.advanceTimersByTimeAsync(100);

      expect(handler).toHaveBeenCalled();

      await stopWorker();
    });

    it("stops polling after stopWorker", async () => {
      const handler = vi.fn().mockResolvedValue(undefined);
      setHandlers({ "darkwatch.scan": handler });

      startWorker({ pollInterval: 50 });
      await stopWorker();

      await queue.enqueue("darkwatch.scan", { userId: "u1", subscriptionId: "s1" });
      await vi.advanceTimersByTimeAsync(200);

      expect(handler).not.toHaveBeenCalled();
    });
  });
});