/**
 * Regression guard — the keepsake must not be sideways.
 *
 * Round 1 taught the compression worker to apply EXIF orientation, which fixed the live app
 * (feed preview + diashow display). The export worker was missed: it does NOT reuse those
 * derivatives — it re-decodes the originals itself with `image::open`, which ignores the
 * orientation tag — and then re-encodes to JPEG, which drops the tag, so the viewer has no
 * way to recover it.
 *
 * The resulting damage was oddly shaped, which is what made it read as a viewer bug:
 *   - Gallery.zip originals            → correct (byte-copied, EXIF intact)
 *   - Memories viewer grid thumbnails  → ALWAYS sideways
 *   - Memories viewer full image >5 MB → sideways (re-encoded at 2000px)
 *   - Memories viewer full image ≤5 MB → correct (streamed byte-for-byte)
 *
 * So clicking a small photo silently "fixed" it and a large one didn't. This pins the
 * thumbnail, which is the path every photo takes.
 */
import { test, expect } from '../../fixtures/test';
import { uploadRaw } from '../../helpers/upload-client';
import { BASE } from '../../helpers/env';
import { execFileSync } from 'node:child_process';
import { mkdtempSync, readFileSync, writeFileSync, rmSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';

// 40x20 landscape pixels tagged Orientation=6 ("rotate 90° CW to display"), so anything
// that honours the tag emits a PORTRAIT derivative.
const EXIF_FIXTURE = join(process.cwd(), 'fixtures', 'media', 'portrait-exif6.jpg');

/** Pixel dimensions from a JPEG's SOF marker — avoids an image dep for one assertion. */
function jpegSize(buf: Buffer): { width: number; height: number } {
  let i = 2;
  while (i < buf.length) {
    if (buf[i] !== 0xff) {
      i++;
      continue;
    }
    const marker = buf[i + 1];
    if (marker >= 0xc0 && marker <= 0xcf && marker !== 0xc4 && marker !== 0xc8 && marker !== 0xcc) {
      return { height: buf.readUInt16BE(i + 5), width: buf.readUInt16BE(i + 7) };
    }
    i += 2 + buf.readUInt16BE(i + 2);
  }
  throw new Error('no SOF marker found — not a JPEG?');
}

test.describe('Export — EXIF orientation in the keepsake', () => {
  test('the Memories viewer thumbnail of a rotated photo is upright', async ({ host, db }) => {
    test.setTimeout(90_000);
    const bearer = { Authorization: `Bearer ${host.jwt}` };

    const src = readFileSync(EXIF_FIXTURE);
    // Sanity: the SOURCE really is stored landscape, or this test proves nothing.
    const srcSize = jpegSize(src);
    expect(srcSize.width).toBeGreaterThan(srcSize.height);

    const up = await uploadRaw(host.jwt, src, {
      filename: 'hochkant.jpg',
      contentType: 'image/jpeg',
      caption: 'hochkant',
    });
    expect(up.status).toBe(201);
    const { id } = (await up.json()) as { id: string };
    await expect.poll(() => db.compressionStatus(id), { timeout: 30_000 }).toBe('done');

    const rel = await fetch(`${BASE}/api/v1/host/gallery/release`, {
      method: 'POST',
      headers: bearer,
    });
    expect(rel.status).toBe(204);

    await expect
      .poll(
        async () => {
          const res = await fetch(`${BASE}/api/v1/export/status`, { headers: bearer });
          return (await res.json()).html?.status;
        },
        { timeout: 60_000, intervals: [500] }
      )
      .toBe('done');

    const ticketRes = await fetch(`${BASE}/api/v1/export/ticket`, {
      method: 'POST',
      headers: bearer,
    });
    const { ticket } = (await ticketRes.json()) as { ticket: string };
    const dl = await fetch(`${BASE}/api/v1/export/html?ticket=${encodeURIComponent(ticket)}`);
    expect(dl.status).toBe(200);

    const dir = mkdtempSync(join(tmpdir(), 'eventsnap-exif-'));
    try {
      const zipPath = join(dir, 'Memories.zip');
      writeFileSync(zipPath, Buffer.from(await dl.arrayBuffer()));

      const entries = execFileSync('unzip', ['-Z1', zipPath], { encoding: 'utf8' })
        .split('\n')
        .filter(Boolean);
      const thumbEntry = entries.find((e) => e.includes(`${id}_thumb`));
      expect(thumbEntry, `no thumbnail for ${id} in Memories.zip`).toBeTruthy();

      // `-p` streams the entry to stdout. Extracting to disk instead fails with EACCES:
      // the archive preserves the container's file mode, which the test user can't read.
      const thumb = execFileSync('unzip', ['-p', zipPath, thumbEntry!], {
        maxBuffer: 64 * 1024 * 1024,
      });
      const { width, height } = jpegSize(thumb);

      expect(
        height,
        `the keepsake grid thumbnail is ${width}x${height} — EXIF orientation was not applied`
      ).toBeGreaterThan(width);
    } finally {
      rmSync(dir, { recursive: true, force: true });
    }
  });
});