import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { CANCELLED, DEFAULT_OPENAI, OpenAiTranscriber, REQUEST_TIMEOUT_MS, TIMED_OUT } from '../src/core/openai';
import type { HttpResponse, TranscribeResult } from '../src/core/ports';
import { SENT_STALE_MS } from '../src/core/record';
import { FakeHttp } from './fakes';

const settings = () => ({ ...DEFAULT_OPENAI, apiKey: 'sk-test-123' });
const audio = () => new Uint8Array([1, 2, 3]).buffer;
const never = () => new Promise<HttpResponse>(() => {});

describe('timeout invariant', () => {
  it('is 5 minutes and below the stale-sent threshold', () => {
    expect(REQUEST_TIMEOUT_MS).toBe(300_000);
    expect(REQUEST_TIMEOUT_MS).toBeLessThan(SENT_STALE_MS);
  });
});

describe('timeout and abort', () => {
  beforeEach(() => {
    vi.useFakeTimers();
  });
  afterEach(() => {
    vi.useRealTimers();
  });

  it('gives up after exactly REQUEST_TIMEOUT_MS and leaves no timers', async () => {
    const t = new OpenAiTranscriber(new FakeHttp(never), settings, () => 0);
    let done: TranscribeResult | undefined;
    const p = t.transcribe(audio(), 'audio/mp4', new AbortController().signal).then((r) => (done = r));
    await vi.advanceTimersByTimeAsync(REQUEST_TIMEOUT_MS - 1);
    expect(done).toBeUndefined();
    await vi.advanceTimersByTimeAsync(1);
    await p;
    expect(done).toEqual({ ok: false, kind: 'temporary', message: TIMED_OUT });
    expect(vi.getTimerCount()).toBe(0);
  });

  it('returns "cancelled" right away when aborted in flight', async () => {
    const c = new AbortController();
    const remove = vi.spyOn(c.signal, 'removeEventListener');
    const p = new OpenAiTranscriber(new FakeHttp(never), settings, () => 0).transcribe(audio(), 'audio/mp4', c.signal);
    await vi.advanceTimersByTimeAsync(1000);
    c.abort();
    expect(await p).toEqual({ ok: false, kind: 'temporary', message: CANCELLED });
    expect(vi.getTimerCount()).toBe(0);
    expect(remove).toHaveBeenCalledWith('abort', expect.any(Function));
  });

  it('clears the timer and the abort listener after a normal answer', async () => {
    const c = new AbortController();
    const remove = vi.spyOn(c.signal, 'removeEventListener');
    const result = await new OpenAiTranscriber(new FakeHttp(), settings, () => 0).transcribe(audio(), 'audio/mp4', c.signal);
    expect(result).toEqual({ ok: true, text: 'ok' });
    expect(vi.getTimerCount()).toBe(0);
    expect(remove).toHaveBeenCalledWith('abort', expect.any(Function));
  });

  it('ignores a late answer after timeout', async () => {
    let resolve!: (r: HttpResponse) => void;
    const http = new FakeHttp(() => new Promise<HttpResponse>((r) => (resolve = r)));
    const p = new OpenAiTranscriber(http, settings, () => 0).transcribe(audio(), 'audio/mp4', new AbortController().signal);
    await vi.advanceTimersByTimeAsync(REQUEST_TIMEOUT_MS);
    expect(await p).toEqual({ ok: false, kind: 'temporary', message: TIMED_OUT });
    resolve({ status: 200, text: '{"text":"late"}' });
    await vi.advanceTimersByTimeAsync(0);
    expect(await p).toEqual({ ok: false, kind: 'temporary', message: TIMED_OUT });
  });

  it('does not leak an unhandled rejection from a late failure', async () => {
    const unhandled: unknown[] = [];
    const onUnhandled = (e: unknown) => unhandled.push(e);
    process.on('unhandledRejection', onUnhandled);
    try {
      let reject!: (e: unknown) => void;
      const http = new FakeHttp(() => new Promise<HttpResponse>((_, r) => (reject = r)));
      const c = new AbortController();
      const p = new OpenAiTranscriber(http, settings, () => 0).transcribe(audio(), 'audio/mp4', c.signal);
      c.abort();
      expect(await p).toEqual({ ok: false, kind: 'temporary', message: CANCELLED });
      reject(new Error('late failure'));
      vi.useRealTimers();
      await new Promise((r) => setTimeout(r, 10));
      expect(unhandled).toEqual([]);
    } finally {
      process.off('unhandledRejection', onUnhandled);
    }
  });
});