import assert from 'node:assert/strict';
import test from 'node:test';
import sharp from 'sharp';
import { buildVisionThumbnailBuffer, VISION_THUMB_MAX_SIDE } from './vision-image-thumb.mjs';

test('buildVisionThumbnailBuffer returns smaller jpeg payload for large png input', async () => {
  const png = await sharp({
    create: {
      width: 3200,
      height: 2400,
      channels: 3,
      background: { r: 120, g: 80, b: 200 },
    },
  })
    .png()
    .toBuffer();

  const thumb = await buildVisionThumbnailBuffer(png, 'image/png');
  const metadata = await sharp(thumb).metadata();

  assert.equal(metadata.format, 'jpeg');
  assert.ok(thumb.length < png.length);
  assert.ok(Math.max(metadata.width ?? 0, metadata.height ?? 0) <= VISION_THUMB_MAX_SIDE);
});