import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import { mkdtempSync, rmSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { enqueueSpan, dequeueSpan, readCursor, writeCursor } from './secretary-queue.mjs';

let dir;
beforeEach(() => { dir = mkdtempSync(join(tmpdir(), 'secq-')); });
afterEach(() => { rmSync(dir, { recursive: true, force: true }); });

const job = (index) => ({ session: 's', span: { start: index * 10, end: index * 10 + 5, index, note: '' }, kind: 'span' });

describe('secretary-queue', () => {
  it('enqueue then dequeue returns jobs in FIFO order', () => {
    enqueueSpan(dir, job(0)); enqueueSpan(dir, job(1));
    expect(dequeueSpan(dir).span.index).toBe(0);
    expect(dequeueSpan(dir).span.index).toBe(1);
    expect(dequeueSpan(dir)).toBe(null);
  });
  it('enqueue dedups by span index (no duplicate jobs)', () => {
    enqueueSpan(dir, job(2)); enqueueSpan(dir, job(2));
    expect(dequeueSpan(dir).span.index).toBe(2);
    expect(dequeueSpan(dir)).toBe(null);
  });
  it('cursor defaults to -1 and round-trips', () => {
    expect(readCursor(dir)).toBe(-1);
    writeCursor(dir, 4);
    expect(readCursor(dir)).toBe(4);
  });
});