const { test } = require('node:test');
const assert = require('node:assert');
const zlib = require('node:zlib');
const { TRAY_ICON_BASE64 } = require('../tray-icon');

test('tray icon is a structurally valid PNG (every chunk CRC checks out)', () => {
  const prefix = 'data:image/png;base64,';
  assert.ok(TRAY_ICON_BASE64.startsWith(prefix));
  const png = Buffer.from(TRAY_ICON_BASE64.slice(prefix.length), 'base64');
  assert.strictEqual(png.subarray(0, 8).toString('hex'), '89504e470d0a1a0a');

  const types = [];
  let off = 8;
  while (off < png.length) {
    const len = png.readUInt32BE(off);
    const type = png.subarray(off + 4, off + 8);
    const body = png.subarray(off + 8, off + 8 + len);
    const crc = png.readUInt32BE(off + 8 + len);
    assert.strictEqual(zlib.crc32(Buffer.concat([type, body])), crc, `bad CRC in ${type}`);
    types.push(type.toString());
    off += 12 + len;
  }
  assert.strictEqual(off, png.length, 'trailing bytes after last chunk');
  assert.deepStrictEqual([types[0], types.at(-1)], ['IHDR', 'IEND']);
});