import { describe, it, expect } from 'vitest';
import { ImportRunner } from '../../src/jobs/importRunner';

describe('jobs/importRunner', () => {
  it('enqueue rechaza después de stop', async () => {
    const runner = new ImportRunner(1);
    runner.start();
    runner.stop();

    await expect(runner.enqueue(() => 'x')).rejects.toThrow();
  });

  it('rechaza tareas en cola tras stop', async () => {
    const r = new ImportRunner(1);

    // Primera tarea comienza inmediatamente
    const t1 = r.enqueue(async () => {
      await new Promise((res) => setTimeout(res, 50));
      return 'ok1';
    });

    // Segunda tarea quedará en cola
    const t2 = r.enqueue(async () => 'ok2');

    // Parar el runner inmediatamente
    r.stop();

    await expect(t1).resolves.toBe('ok1');
    await expect(t2).rejects.toThrow(/ImportRunner stopped/);

    const s = r.getStatus();
    expect(s.completed).toBeGreaterThanOrEqual(1);
  });

  it('completed incrementa en rechazo', async () => {
    const runner = new ImportRunner(1);
    runner.start();

    const p = runner.enqueue(() => Promise.reject(new Error('boom')));

    await expect(p).rejects.toThrow('boom');

    const status = runner.getStatus();
    expect(status.completed).toBeGreaterThanOrEqual(1);

    runner.stop();
  });

  it('enqueue resuelve con el resultado de la tarea', async () => {
    const runner = new ImportRunner(2);
    runner.start();

    const result = await runner.enqueue(async () => 'ok');
    expect(result).toBe('ok');

    const status = runner.getStatus();
    expect(status.completed).toBe(1);
    expect(status.running).toBe(0);
    expect(status.queued).toBe(0);
    expect(status.concurrency).toBe(2);

    runner.stop();
  });

  it('respeta la concurrencia configurada', async () => {
    const concurrency = 2;
    const runner = new ImportRunner(concurrency);
    runner.start();

    let active = 0;
    const observed: number[] = [];

    const makeTask = (delay: number) => async () => {
      active++;
      observed.push(active);
      await new Promise((r) => setTimeout(r, delay));
      active--;
      return 'done';
    };

    const promises = [];
    for (let i = 0; i < 5; i++) {
      promises.push(runner.enqueue(makeTask(80)));
    }

    await Promise.all(promises);

    expect(Math.max(...observed)).toBeLessThanOrEqual(concurrency);

    runner.stop();
  });

  it('getStatus reporta queued, running, completed y concurrency', async () => {
    const concurrency = 2;
    const runner = new ImportRunner(concurrency);
    runner.start();

    const p1 = runner.enqueue(() => new Promise((r) => setTimeout(() => r('a'), 60)));
    const p2 = runner.enqueue(() => new Promise((r) => setTimeout(() => r('b'), 60)));
    const p3 = runner.enqueue(() => new Promise((r) => setTimeout(() => r('c'), 60)));

    // allow the runner to start tasks
    await new Promise((r) => setImmediate(r));

    const statusNow = runner.getStatus();
    expect(statusNow.concurrency).toBe(concurrency);
    expect(statusNow.running).toBeLessThanOrEqual(concurrency);
    expect(statusNow.queued).toBeGreaterThanOrEqual(0);

    await Promise.all([p1, p2, p3]);

    const statusAfter = runner.getStatus();
    expect(statusAfter.queued).toBe(0);
    expect(statusAfter.running).toBe(0);
    expect(statusAfter.completed).toBe(3);

    runner.stop();
  });
});