#!/usr/bin/env node
/*
  Generate verify inputs from an export folder
  Usage: node scripts/make-verify-json.js --root <export_folder> --extras <out_extras.json> --assets <out_assets.json>
*/
const fs = require('fs');
const fsp = require('fs/promises');
const path = require('path');

function parseArgs(argv) {
  const out = { root: '', extras: '', assets: '' };
  for (let i = 2; i < argv.length; i++) {
    const a = argv[i];
    if (a === '--root') out.root = argv[++i];
    else if (a === '--extras') out.extras = argv[++i];
    else if (a === '--assets') out.assets = argv[++i];
  }
  return out;
}

function toB64(buf) { return Buffer.from(buf).toString('base64'); }

async function readFileB64(p) { const b = await fsp.readFile(p); return toB64(b); }

async function walk(dir) {
  const out = [];
  const entries = await fsp.readdir(dir, { withFileTypes: true });
  for (const ent of entries) {
    const abs = path.join(dir, ent.name);
    if (ent.isDirectory()) {
      const sub = await walk(abs);
      out.push(...sub);
    } else if (ent.isFile()) {
      out.push(abs);
    }
  }
  return out;
}

(async () => {
  try {
    const { root, extras, assets } = parseArgs(process.argv);
    if (!root || !extras || !assets) {
      console.log('Usage: node scripts/make-verify-json.js --root <export_folder> --extras <out_extras.json> --assets <out_assets.json>');
      process.exit(2);
    }
    const rootAbs = path.resolve(process.cwd(), root);
    const files = await walk(rootAbs);
    const norm = (p) => p.split(path.sep).join('/');
    const rootNorm = norm(rootAbs).replace(/\/$/, '');
    const rel = (p) => {
      const pn = norm(p);
      return pn.startsWith(rootNorm + '/') ? pn.slice(rootNorm.length + 1) : pn;
    };

    const extrasMap = {};
    const assetsMap = {};

    // integrity index
    const idx = files.find((p) => rel(p) === 'assets.integrity.index.json');
    if (idx) {
      extrasMap['assets.integrity.index.json'] = await readFileB64(idx);
    }

    // assets/**/*
    for (const abs of files) {
      const r = rel(abs);
      if (!r.startsWith('assets/')) continue;
      const b64 = await readFileB64(abs);
      assetsMap[r] = b64;
    }

    await fsp.mkdir(path.dirname(path.resolve(process.cwd(), extras)), { recursive: true });
    await fsp.mkdir(path.dirname(path.resolve(process.cwd(), assets)), { recursive: true });
    await fsp.writeFile(extras, JSON.stringify(extrasMap));
    await fsp.writeFile(assets, JSON.stringify(assetsMap));
    console.log(`Wrote ${extras} and ${assets}`);
  } catch (e) {
    console.error(e && e.stack || String(e));
    process.exit(1);
  }
})();