/*
 * publish-update.cjs — copy the freshly built installer to the church's update folder and write
 * the latest.json manifest the app reads. Run after a build:
 *
 *   npm run release                          (build + publish)
 *   npm run publish-update                   (publish the newest existing build)
 *   npm run publish-update -- "D:\Builds"    (publish to a specific folder)
 *   npm run publish-update -- "D:\Builds" "Notes about this version"
 *
 * Destination order: CLI arg  ->  BIBLEAPP_UPDATE_DIR env  ->  the folder configured in the app
 * (Notes/update-config.json)  ->  dist-installer/publish
 */
const fs = require('fs');
const path = require('path');
const os = require('os');
const crypto = require('crypto');

// Fingerprint a file so a truncated or interrupted copy can never be mistaken for a good build.
function sha256(file) {
  return new Promise((resolve, reject) => {
    const h = crypto.createHash('sha256');
    const s = fs.createReadStream(file);
    s.on('data', c => h.update(c));
    s.on('error', reject);
    s.on('end', () => resolve(h.digest('hex')));
  });
}

const ROOT = path.join(__dirname, '..');
const pkg = JSON.parse(fs.readFileSync(path.join(ROOT, 'package.json'), 'utf-8'));
const version = pkg.version;

function appNotesDir() {
  // Mirrors the app's user-content location so we can reuse the configured update folder.
  const base = process.env.APPDATA || path.join(os.homedir(), 'AppData', 'Roaming');
  return path.join(base, 'Bible App', 'user-content', 'Notes');
}

function configuredDest() {
  try {
    const p = path.join(appNotesDir(), 'update-config.json');
    if (fs.existsSync(p)) {
      const cfg = JSON.parse(fs.readFileSync(p, 'utf-8'));
      const s = String(cfg.source || '').trim();
      if (s && !/^https?:\/\//i.test(s)) return s;   // http sources are uploaded by hand
    }
  } catch (_) {}
  return '';
}

const argDest = process.argv[2] && !process.argv[2].startsWith('--') ? process.argv[2] : '';
const notes = process.argv[3] || '';
const dest = argDest || process.env.BIBLEAPP_UPDATE_DIR || configuredDest() || path.join(ROOT, 'dist-installer', 'publish');

const distDir = path.join(ROOT, 'dist-installer');
if (!fs.existsSync(distDir)) {
  console.error('No dist-installer folder — run the build first (npm run build:win).');
  process.exit(1);
}

// Prefer the installer matching package.json's version; else the newest .exe in dist-installer.
const exact = fs.readdirSync(distDir).find(f => f.endsWith('.exe') && f.includes(version));
let installer = exact;
if (!installer) {
  const exes = fs.readdirSync(distDir)
    .filter(f => f.toLowerCase().endsWith('.exe'))
    .map(f => ({ f, t: fs.statSync(path.join(distDir, f)).mtimeMs }))
    .sort((a, b) => b.t - a.t);
  if (!exes.length) { console.error('No installer (.exe) found in dist-installer.'); process.exit(1); }
  installer = exes[0].f;
  console.warn(`! No installer named for v${version}; publishing newest: ${installer}`);
}

fs.mkdirSync(dest, { recursive: true });
const srcPath = path.join(distDir, installer);
const destPath = path.join(dest, installer);
const sizeMB = (fs.statSync(srcPath).size / 1048576).toFixed(0);

console.log(`Publishing v${version}`);
console.log(`  installer : ${installer} (${sizeMB} MB)`);
console.log(`  to        : ${dest}`);
fs.copyFileSync(srcPath, destPath);

/*
 * The AI model does NOT need to go in the update folder any more: a new machine gets it from the
 * one-file "Bible App Full Setup" bundle, and machines that already have it keep it (it lives in
 * ProgramData/user-data, which no installer touches). So updates stay ~300 MB instead of ~2.2 GB.
 *
 * We still refresh a model.gguf that is ALREADY published, so an existing Settings > Local AI
 * install path keeps working; pass --with-model to publish it for the first time.
 */
let modelPublished = false;
try {
  const modelSrc = path.join(ROOT, 'vendor', 'llama', 'model.gguf');
  const modelDest = path.join(dest, 'model.gguf');
  const wanted = process.argv.includes('--with-model') || fs.existsSync(modelDest);
  if (!wanted) {
    console.log('  AI model  : skipped (ships in the full one-file installer; use --with-model to publish it here)');
  } else if (fs.existsSync(modelSrc)) {
    const srcSize = fs.statSync(modelSrc).size;
    const needCopy = !fs.existsSync(modelDest) || fs.statSync(modelDest).size !== srcSize;
    if (needCopy) {
      console.log(`  AI model  : copying model.gguf (${(srcSize / 1073741824).toFixed(2)} GB) — one time…`);
      fs.copyFileSync(modelSrc, modelDest);
    } else {
      console.log('  AI model  : already published (unchanged)');
    }
    modelPublished = true;
  } else {
    console.warn('! vendor/llama/model.gguf not found — publish it manually so machines can install the AI model.');
  }
} catch (e) {
  console.warn('! Could not publish the AI model:', e.message);
}

(async () => {
const installerSize = fs.statSync(destPath).size;
const installerHash = await sha256(destPath);
let modelSize, modelHash;
try {
  const md = path.join(dest, 'model.gguf');
  if (modelPublished && fs.existsSync(md)) {
    modelSize = fs.statSync(md).size;
    console.log('  hashing model (integrity check)…');
    modelHash = await sha256(md);
  }
} catch (_) {}

const manifest = {
  version,
  file: installer,
  size: installerSize,
  sha256: installerHash,
  notes: notes || `Bible App ${version}`,
  date: new Date().toISOString().slice(0, 10),
  model: modelPublished ? 'model.gguf' : undefined,
  modelSize,
  modelSha256: modelHash
};
fs.writeFileSync(path.join(dest, 'latest.json'), JSON.stringify(manifest, null, 2) + '\n');
// Companion file so a person can verify a hand-copied installer:
//   Get-FileHash "Bible App Setup x.y.z.exe" -Algorithm SHA256
fs.writeFileSync(path.join(dest, installer + '.sha256'), installerHash + '  ' + installer + '\n');
console.log(`  sha256    : ${installerHash}`);

// Keep the folder tidy: retain the 3 newest installers alongside the current one.
try {
  const olds = fs.readdirSync(dest)
    .filter(f => f.toLowerCase().endsWith('.exe') && f !== installer)
    .map(f => ({ f, t: fs.statSync(path.join(dest, f)).mtimeMs }))
    .sort((a, b) => b.t - a.t)
    .slice(3);
  olds.forEach(o => { try { fs.unlinkSync(path.join(dest, o.f)); console.log(`  removed old build: ${o.f}`); } catch (_) {} });
} catch (_) {}

console.log('\nDone. The app will offer this version from Settings > Updates.');
console.log(`Manifest: ${path.join(dest, 'latest.json')}`);
})().catch(e => { console.error('Publish failed:', e && e.message || e); process.exit(1); });