/**
 * USER_JOURNEYS.md §7 — liking and commenting.
 *
 * Like behavior is asserted deterministically via the feed snapshot; the comment
 * SSE round-trip is asserted by subscribing to the stream as a second user and
 * waiting for the `new-comment` event to arrive.
 */
import { test, expect } from '../../fixtures/test';
import { SseListener } from '../../helpers/sse-listener';
import { uploadRaw, JPEG_MAGIC } from '../../helpers/upload-client';

const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';

async function seedUpload(jwt: string, db: any, caption?: string): Promise<string> {
  const body = new Uint8Array(1024);
  body.set(JPEG_MAGIC, 0);
  const res = await uploadRaw(jwt, body, { filename: 'a.jpg', contentType: 'image/jpeg', caption });
  if (res.status !== 201) throw new Error(`seed upload failed: ${res.status} ${await res.text()}`);
  const { id } = await res.json();
  await db.setUploadCompressionStatus(id, 'done');
  return id;
}

async function like(jwt: string, uploadId: string): Promise<number> {
  const res = await fetch(`${BASE}/api/v1/upload/${uploadId}/like`, {
    method: 'POST',
    headers: { Authorization: `Bearer ${jwt}` },
  });
  return res.status;
}

function findRow(feed: any, id: string): any {
  const list: any[] = feed.uploads ?? feed.items ?? feed;
  return list.find((u: any) => u.id === id);
}

test.describe('Feed — like + comment', () => {
  test('a like counts once per user and toggles off on repeat (no double-count)', async ({ api, guest, db }) => {
    const author = await guest('Author');
    const liker = await guest('Liker');
    const uploadId = await seedUpload(author.jwt, db);

    // Baseline: nobody has liked yet.
    let row = findRow(await api.getFeed(liker.jwt), uploadId);
    expect(row.like_count).toBe(0);
    expect(row.liked_by_me).toBe(false);

    // First like → counted exactly once.
    expect(await like(liker.jwt, uploadId)).toBe(204);
    row = findRow(await api.getFeed(liker.jwt), uploadId);
    expect(row.like_count).toBe(1);
    expect(row.liked_by_me).toBe(true);

    // Liking again is a toggle → back to zero (guards against a regression that
    // double-counts a repeated like instead of removing it).
    expect(await like(liker.jwt, uploadId)).toBe(204);
    row = findRow(await api.getFeed(liker.jwt), uploadId);
    expect(row.like_count).toBe(0);
    expect(row.liked_by_me).toBe(false);

    // A second distinct user's like is counted independently (per-user semantics).
    expect(await like(liker.jwt, uploadId)).toBe(204); // liker likes again → 1
    expect(await like(author.jwt, uploadId)).toBe(204); // author likes too → 2
    row = findRow(await api.getFeed(liker.jwt), uploadId);
    expect(row.like_count).toBe(2);
  });

  test('comment by user A → SSE new-comment delivered to user B', async ({ guest, db }) => {
    // SSE frames can take a keep-alive tick to flush through the reverse proxy, so
    // both the stream connect and the delivery may cost up to ~30s each.
    test.setTimeout(120_000);
    const a = await guest('CommenterA');
    const b = await guest('ListenerB');

    // B subscribes to the stream BEFORE A comments, so the broadcast is captured.
    const sse = new SseListener();
    await sse.start(b.jwt);

    try {
      const uploadId = await seedUpload(a.jwt, db, 'pic');
      const cRes = await fetch(`${BASE}/api/v1/upload/${uploadId}/comments`, {
        method: 'POST',
        headers: { Authorization: `Bearer ${a.jwt}`, 'Content-Type': 'application/json' },
        body: JSON.stringify({ body: 'hello from A' }),
      });
      expect(cRes.status).toBe(201);

      // B must receive the new-comment event for this upload. Generous timeout: SSE
      // frames flush on the keep-alive tick through the compressing reverse proxy.
      const evt = await sse.waitForEvent(
        'new-comment',
        (e) => e.data?.upload_id === uploadId,
        45_000
      );
      expect(evt.data.comment_count).toBe(1);
    } finally {
      sse.stop();
    }
  });
});