import { createHash } from 'node:crypto';
import { readFile } from 'node:fs/promises';
import { dirname, join, relative } from 'node:path';
import { fileURLToPath } from 'node:url';

const repositoryRoot = join(dirname(fileURLToPath(import.meta.url)), '..');
const expectedVersion = '0.12.10';
const outputRoot = join(
  repositoryRoot,
  'public',
  'vendor',
  'ffmpeg',
  expectedVersion
);
const manifestPath = join(outputRoot, 'version.json');
const manifest = JSON.parse(await readFile(manifestPath, 'utf8'));

if (
  manifest.schemaVersion !== 1 ||
  manifest.coreVersion !== expectedVersion ||
  !Array.isArray(manifest.assets) ||
  manifest.assets.length !== 5
) {
  throw new Error(`Invalid FFmpeg asset manifest: ${manifestPath}`);
}

const expectedPaths = new Set([
  'mt/ffmpeg-core.js',
  'mt/ffmpeg-core.wasm',
  'mt/ffmpeg-core.worker.js',
  'st/ffmpeg-core.js',
  'st/ffmpeg-core.wasm',
]);
const expectedHashes = new Map([
  [
    'st/ffmpeg-core.js',
    '67a48f11645f85439f3fde4f2119042c16b374b910206b7a7a24f342e28dcae3',
  ],
  [
    'st/ffmpeg-core.wasm',
    '9f57947a5bd530d8f00c5b3f2cb2a3492faa7e5d823315342d6a8656d0a6b7b7',
  ],
  [
    'mt/ffmpeg-core.js',
    '270a2e6ff945e173238610669a3f7132df5f9c52698a9bf708cf5c2ab6bda0de',
  ],
  [
    'mt/ffmpeg-core.wasm',
    'be2c97605366b78f3f13e21b52e81a55a79e1f29c133b03a68ec187b1a2ec41a',
  ],
  [
    'mt/ffmpeg-core.worker.js',
    'f77898d631dc010b45c29c23cb4379c611a7d7b131bf591d08a656bb729a4ca3',
  ],
]);

for (const asset of manifest.assets) {
  if (!expectedPaths.delete(asset.path)) {
    throw new Error(`Unexpected or duplicate FFmpeg asset: ${asset.path}`);
  }
  const bytes = await readFile(join(outputRoot, asset.path));
  const digest = createHash('sha256').update(bytes).digest('hex');
  if (
    asset.bytes !== bytes.byteLength ||
    asset.sha256 !== digest ||
    expectedHashes.get(asset.path) !== digest
  ) {
    throw new Error(`FFmpeg asset verification failed: ${asset.path}`);
  }
}

if (expectedPaths.size > 0) {
  throw new Error(
    `FFmpeg assets are missing: ${[...expectedPaths].join(', ')}`
  );
}

console.log(
  `Verified 5 FFmpeg ${expectedVersion} assets in ${relative(repositoryRoot, outputRoot)}`
);