/**
 * Regression guard — an image that would blow the decode budget must be refused at the
 * door, with a reason the guest can act on, and must never allocate.
 *
 * Two defects met here.
 *
 * 1. The budget was inert. `max_alloc = 256 MiB` was set, but reading the EXIF orientation
 *    tag requires `ImageReader::into_decoder()`, which skips the
 *    `limits.reserve(decoder.total_bytes())` that `decode()` performs — and nothing else
 *    enforces it (the JPEG decoder's `set_limits` only checks support and dimensions). The
 *    only real bound was the 12000px per-axis cap, leaving two concurrent decodes at
 *    824 MiB against a 1 GiB container. This suite could not have caught it either, because
 *    the e2e app container had NO memory limit while production is capped at 1 GiB; that cap
 *    is now mirrored in docker-compose.test.yml so these assertions mean something.
 *
 * 2. Even with the budget restored, the upload was ACCEPTED with a 201 and then silently
 *    soft-deleted minutes later when the worker gave up — the photo simply vanished, with at
 *    best a vague "could not be processed". Admission now runs the same budget check against
 *    the header, so the guest is told immediately and told why.
 *
 * Fixture: 11000x9000 = 99 MP, 568 KiB on disk. Deliberately UNDER the per-axis cap, so the
 * axis check cannot be what rejects it — 283 MiB decoded against a 256 MiB budget. A fixture
 * at 13000px would pass this test against a build with no budget at all.
 */
import { test, expect } from '../../fixtures/test';
import { uploadRaw } from '../../helpers/upload-client';
import { BASE } from '../../helpers/env';
import { readFileSync } from 'node:fs';
import { join } from 'node:path';

const HUGE = join(process.cwd(), 'fixtures', 'media', 'huge-99mp.jpg');
const SAMPLE = join(process.cwd(), 'fixtures', 'media', 'sample.jpg');

test.describe('Upload — an oversized image is refused, not allocated', () => {
  test('a 99 MP upload is rejected at admission with a readable reason', async ({ guest, db }) => {
    test.setTimeout(60_000);
    const g = await guest('BombThrower');
    const before = await db.countUploadsForUser(g.userId);

    const res = await uploadRaw(g.jwt, readFileSync(HUGE), {
      filename: 'huge.jpg',
      contentType: 'image/jpeg',
      caption: 'zu gross',
    });

    // 4xx, not 201-then-vanish. The queue classifies this as terminal, so the guest gets the
    // message rather than watching the photo disappear.
    expect(res.status, 'an undecodable image must be refused at the door').toBe(400);
    const body = (await res.json()) as { message?: string };
    expect(body.message ?? '', 'the reason must be actionable, not generic').toMatch(/bildpunkte/i);
    expect(body.message ?? '', 'and should name the size so it is obvious why').toMatch(/99/);

    // Nothing was stored — no row to soft-delete later, no orphaned file to sweep.
    expect(await db.countUploadsForUser(g.userId)).toBe(before);

    // The backend never allocated: it is still alive and still doing useful work.
    expect((await fetch(`${BASE}/health`)).status).toBe(200);
    const ok = await uploadRaw(g.jwt, readFileSync(SAMPLE), {
      filename: 'after.jpg',
      contentType: 'image/jpeg',
    });
    expect(ok.status).toBe(201);
    const after = (await ok.json()) as { id: string };
    await expect.poll(() => db.compressionStatus(after.id), { timeout: 30_000 }).toBe('done');
  });

  test('a burst of oversized uploads leaves the container alive', async ({ guest }) => {
    // The concurrent case is the one that OOM'd: `compression_concurrency` is 2, so decodes
    // overlapped. Four at once is comfortably past that, and must still cost only header
    // reads.
    test.setTimeout(60_000);
    const g = await guest('BombThrower2');
    const bytes = readFileSync(HUGE);

    const results = await Promise.all(
      Array.from({ length: 4 }, (_, i) =>
        uploadRaw(g.jwt, bytes, { filename: `huge-${i}.jpg`, contentType: 'image/jpeg' })
      )
    );
    expect(results.map((r) => r.status)).toEqual([400, 400, 400, 400]);

    expect(
      (await fetch(`${BASE}/health`)).status,
      'concurrent oversized uploads must not kill the backend'
    ).toBe(200);
  });

  test('an ordinary photo is unaffected by the admission check', async ({ guest, db }) => {
    // The mirror that keeps the check honest: a budget that rejected everything would pass
    // both tests above.
    const g = await guest('NormalShooter');
    const res = await uploadRaw(g.jwt, readFileSync(SAMPLE), {
      filename: 'normal.jpg',
      contentType: 'image/jpeg',
    });
    expect(res.status).toBe(201);
    const { id } = (await res.json()) as { id: string };
    await expect.poll(() => db.compressionStatus(id), { timeout: 30_000 }).toBe('done');
  });
});