import { brotliCompressSync, constants as zlibConstants } from 'node:zlib';
import { readdirSync, readFileSync, writeFileSync } from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const distAssetsDir = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '../dist/assets');

const brotliOptions = {
    params: {
        [zlibConstants.BROTLI_PARAM_QUALITY]: 11,
        [zlibConstants.BROTLI_PARAM_LGWIN]: 24
    }
};

const wasmFiles = readdirSync(distAssetsDir).filter(name => name.endsWith('.wasm'));

if (wasmFiles.length === 0) {
    console.error('optimize-dist-wasm: no .wasm files in dist/assets');
    process.exit(1);
}

console.log('optimize-dist-wasm: brotli sidecars for', wasmFiles.length, 'file(s)');

for (const fileName of wasmFiles) {
    const wasmPath = path.join(distAssetsDir, fileName);
    console.log('optimize-dist-wasm: brotli', wasmPath);

    const compressed = brotliCompressSync(readFileSync(wasmPath), brotliOptions);
    console.log('optimize-dist-wasm: compressed', compressed.length);

    writeFileSync(`${wasmPath}.br`, compressed);
}