/**
 * Re-review regression guard — Chain #2 ("export corruption on reopen→re-release").
 *
 * Bug that was fixed: `spawn_export_jobs` ran the worker unconditionally and the
 * worker wrote a FIXED temp path (`Gallery.zip.tmp` / `viewer_tmp_{event}`).
 * The new reopen→re-release flow could therefore spawn a second worker while the
 * first was still running — two workers stomping the same temp file → a corrupt
 * keepsake ZIP served to guests.
 *
 * The fix: `claim_job` is an atomic `UPDATE ... WHERE status='pending'`; a worker
 * that doesn't win the claim bails without touching the temp file. The re-enqueue
 * `ON CONFLICT DO UPDATE ... WHERE status <> 'running'` leaves an in-flight job
 * alone. Net: exactly one worker per (event,type).
 *
 * This test seeds real uploads, releases, then churns reopen→re-release (stressing
 * the claim guard), waits for the export to settle, and asserts the produced ZIP is
 * INTACT (passes `unzip -t`) with exactly one entry per upload — plus that no
 * export_job row is left stuck `running`. A temp-file race would corrupt/truncate
 * the archive or drop entries, failing these assertions.
 *
 * Note on scope: a Dockerised export over small fixtures completes in well under a
 * second, so this cannot *deterministically* force two workers to overlap in time.
 * It stresses the claim/ON-CONFLICT guard under rapid churn and hard-checks archive
 * integrity; the atomic single-worker guarantee itself is additionally proven by
 * code review + SQL PREPARE. Together they cover the regression.
 */
import { test, expect } from '../../fixtures/test';
import { Client } from 'pg';
import { execFileSync } from 'node:child_process';
import { writeFileSync, mkdtempSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { seedUpload } from '../../helpers/seed';

const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
const SLUG = 'e2e-test-event';
const N_UPLOADS = 6;

const PG = {
  host: process.env.E2E_DB_HOST ?? 'localhost',
  port: Number(process.env.E2E_DB_PORT ?? '55432'),
  user: process.env.E2E_DB_USER ?? 'eventsnap_test',
  password: process.env.E2E_DB_PASSWORD ?? 'eventsnap_test',
  database: process.env.E2E_DB_NAME ?? 'eventsnap_test',
};

async function pgQuery<T = any>(sql: string): Promise<T[]> {
  const c = new Client(PG);
  await c.connect();
  try {
    return (await c.query(sql)).rows as T[];
  } finally {
    await c.end();
  }
}

function post(path: string, jwt: string) {
  return fetch(BASE + path, { method: 'POST', headers: { Authorization: `Bearer ${jwt}` } });
}

async function exportStatus(jwt: string): Promise<any> {
  const res = await fetch(BASE + '/api/v1/export/status', { headers: { Authorization: `Bearer ${jwt}` } });
  return res.json();
}

async function mintTicket(jwt: string): Promise<string> {
  const res = await post('/api/v1/export/ticket', jwt);
  return (await res.json()).ticket;
}

test.describe('Flow re-review — reopen→re-release export integrity (#2)', () => {
  // The real export job runs image processing; give it head-room over the tiny fixtures.
  test.setTimeout(90_000);

  test('rapid release/reopen/re-release yields exactly one INTACT ZIP and no stuck jobs', async ({
    host,
  }) => {
    // Seed real, decodable uploads while the event is open.
    for (let i = 0; i < N_UPLOADS; i++) {
      await seedUpload(host.jwt, { caption: `pic ${i}` });
    }

    // First release → export starts and uploads lock (release ⇒ lock).
    expect((await post('/api/v1/host/gallery/release', host.jwt)).status).toBe(204);

    // Post-release uploads must be rejected (belt-and-suspenders on top of the lock).
    const { uploadRaw } = await import('../../helpers/upload-client');
    const { readFileSync } = await import('node:fs');
    const rejected = await uploadRaw(host.jwt, readFileSync(join(process.cwd(), 'fixtures', 'media', 'sample.jpg')), {
      filename: 'late.jpg',
      contentType: 'image/jpeg',
    });
    expect(rejected.status).toBe(403);

    // Churn: reopen (clears release + ready flags) then re-release, several times in
    // quick succession. This is the path that used to be able to double-spawn workers
    // over the shared temp file. End on a release so the gallery is left released.
    for (let i = 0; i < 4; i++) {
      expect((await post('/api/v1/host/event/open', host.jwt)).status).toBe(204);
      const rel = await post('/api/v1/host/gallery/release', host.jwt);
      expect(rel.status).toBe(204);
    }

    // Wait for the export to settle: both jobs done and the ZIP marked ready.
    await expect
      .poll(async () => {
        const s = await exportStatus(host.jwt);
        return s.released === true && s.zip?.status === 'done' && s.html?.status === 'done';
      }, { timeout: 60_000, intervals: [500] })
      .toBe(true);

    // No export_job may be left stuck 'running' (would mean a worker that never
    // completed — the failure mode the claim guard exists to avoid).
    const jobs = await pgQuery<{ type: string; status: string }>(
      `SELECT ej.type::text AS type, ej.status::text AS status
         FROM export_job ej JOIN event e ON e.id = ej.event_id
        WHERE e.slug = '${SLUG}'`
    );
    expect(jobs.length).toBe(2);
    for (const j of jobs) expect(j.status, `${j.type} job status`).toBe('done');

    // Download the ZIP and prove it is INTACT — a temp-file race would corrupt or
    // truncate it. `unzip -t` verifies every entry's CRC; a non-zero exit throws.
    const ticket = await mintTicket(host.jwt);
    const res = await fetch(BASE + '/api/v1/export/zip?ticket=' + encodeURIComponent(ticket));
    expect(res.status).toBe(200);
    const bytes = Buffer.from(await res.arrayBuffer());
    // ZIP local-file-header magic — a stomped/half-written file fails this immediately.
    expect(bytes.subarray(0, 2).toString('latin1')).toBe('PK');

    const dir = mkdtempSync(join(tmpdir(), 'es-zip-'));
    const zipPath = join(dir, 'Gallery.zip');
    writeFileSync(zipPath, bytes);

    // Integrity: `unzip -t` exits 0 only if all CRCs check out and the archive is whole.
    execFileSync('unzip', ['-t', zipPath], { stdio: 'pipe' });

    // Completeness: exactly one entry per seeded upload — no entry lost to a stomped
    // temp file, none duplicated by a second worker.
    const listing = execFileSync('unzip', ['-Z1', zipPath], { encoding: 'utf8' })
      .split('\n')
      .map((l) => l.trim())
      .filter((l) => l.length > 0 && !l.endsWith('/'));
    expect(listing.length, `zip entries:\n${listing.join('\n')}`).toBe(N_UPLOADS);
  });

  test('re-release does NOT disturb an in-flight (running) export job — the anti-race guard', async ({
    host,
  }) => {
    // Deterministic proof of the fix, independent of export timing. We simulate a worker
    // that is still mid-export by pinning the zip job to `running` with a sentinel
    // progress value, then drive reopen→re-release. The fix's
    //   ON CONFLICT ... DO UPDATE ... WHERE export_job.status <> 'running'
    // must leave that row untouched (and the freshly-spawned worker's
    //   claim_job: UPDATE ... WHERE status = 'pending'
    // finds nothing to claim, so it bails without racing the temp file).
    //
    // On the OLD code (unconditional ON CONFLICT DO UPDATE) the row would be reset to
    // pending/progress=0 and a second worker would claim and run concurrently — so the
    // sentinel below would be wiped. This assertion therefore fails on the bug and passes
    // on the fix.
    await seedUpload(host.jwt, { caption: 'a' });
    await seedUpload(host.jwt, { caption: 'b' });

    // Release and let the first export fully finish so no real worker is active.
    expect((await post('/api/v1/host/gallery/release', host.jwt)).status).toBe(204);
    await expect
      .poll(async () => {
        const s = await exportStatus(host.jwt);
        return s.zip?.status === 'done' && s.html?.status === 'done';
      }, { timeout: 60_000, intervals: [500] })
      .toBe(true);

    // Simulate an in-flight worker owning the zip job, with a sentinel we can check.
    await pgQuery(
      `UPDATE export_job ej SET status = 'running', progress_pct = 77
         FROM event e
        WHERE e.id = ej.event_id AND e.slug = '${SLUG}' AND ej.type = 'zip'`
    );

    // Reopen (clears release + ready flags, does NOT touch job rows) then re-release.
    expect((await post('/api/v1/host/event/open', host.jwt)).status).toBe(204);
    expect((await post('/api/v1/host/gallery/release', host.jwt)).status).toBe(204);

    // Give any spawned worker a beat to attempt (and, correctly, bail) its claim.
    await new Promise((r) => setTimeout(r, 750));

    // The guard must have preserved the 'running' sentinel — untouched by both the
    // re-enqueue and the bailing worker.
    const [row] = await pgQuery<{ status: string; progress_pct: number }>(
      `SELECT ej.status::text AS status, ej.progress_pct
         FROM export_job ej JOIN event e ON e.id = ej.event_id
        WHERE e.slug = '${SLUG}' AND ej.type = 'zip'`
    );
    expect(row.status, 'zip job status').toBe('running');
    expect(Number(row.progress_pct), 'zip job sentinel progress').toBe(77);
  });
});