/**
 * Builds the mdb-reader bundle the Access Viewer (/access-viewer) loads from
 * /vendor/local/mdb-reader@3.2.0-jm1/mdb-reader.mjs.
 *
 * Why a local build rather than vendor.json: mdb-reader's browser build does
 * its AES and hashing with browserify-aes and create-hash, which carry their
 * own Buffer polyfill (safe-buffer over buffer 5). Mixed with the Buffer
 * mdb-reader is handed, decryption returned pages that were too short, so a
 * password-protected .accdb never opened in a browser ("offset is not uint").
 * Here mdb-reader's environment module is swapped for environment.js, which
 * uses @noble/ciphers and @noble/hashes (MIT, synchronous, no Node streams),
 * and one Buffer (buffer 6) is bundled in and exported for the caller to use.
 * mdb-reader's own code is not changed.
 *
 * Versions are pinned by package-lock.json (integrity hashes). Run:
 *   cd frontend/vendor-src/mdb-reader && npm ci --ignore-scripts && node build.mjs
 * then: node scripts/vendor-local-lock.mjs (from frontend/), since the output
 * folder is immutable once shipped; a changed build needs a new -jmN folder.
 */
import { build } from '../../node_modules/esbuild/lib/main.js';
import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const here = path.dirname(fileURLToPath(import.meta.url));
const version = JSON.parse(fs.readFileSync(path.join(here, 'node_modules/mdb-reader/package.json'), 'utf8')).version;
if (version !== '3.2.0') throw new Error(`expected mdb-reader 3.2.0, found ${version}: check environment.js and the output folder together`);

const out = path.join(here, '../../vendor/local/mdb-reader@3.2.0-jm1/mdb-reader.mjs');
const environment = path.join(here, 'environment.js');
const shims = path.join(here, 'node_modules/.shims.js');
// Buffer as a global, which mdb-reader uses without importing it.
fs.writeFileSync(shims, "import { Buffer } from 'buffer';\nexport { Buffer };\n");
const entry = path.join(here, 'node_modules/.entry.js');
fs.writeFileSync(entry, "export { default } from 'mdb-reader';\nexport { Buffer } from 'buffer';\n");

await build({
  entryPoints: [entry],
  absWorkingDir: here,
  bundle: true,
  format: 'esm',
  platform: 'browser',
  minify: true,
  inject: [shims],
  define: { global: 'globalThis' },
  legalComments: 'eof',
  outfile: out,
  logLevel: 'warning',
  plugins: [
    {
      name: 'environment',
      setup(b) {
        b.onResolve({ filter: /environment\/index\.js$/ }, () => ({ path: environment }));
      },
    },
  ],
});
console.log(`wrote ${path.relative(process.cwd(), out)} (${fs.statSync(out).size} bytes)`);