/*
 * publish-update.cjs — put the freshly built installer where the app's updater can find it, and
 * write the latest.json manifest it reads. Run after a build:
 *
 *   npm run release                          (build + publish)
 *   npm run publish-update                   (publish the newest existing build)
 *   npm run publish-update -- "<dest>"       (publish to a specific destination)
 *   npm run publish-update -- "<dest>" "Notes about this version"
 *
 * A destination is either:
 *
 *   a folder or network share   \\SERVER\share\bible-app, D:\Builds   -> the files are copied there
 *   an http(s) URL              http://gitea:3000/api/packages/...    -> uploaded to Gitea
 *
 * The URL form targets a Gitea *generic package registry*, not a release: Gitea caps release
 * attachments (100 MB here, and .exe is not an allowed type) while the package registry takes the
 * ~750 MB installer and serves it to anonymous readers, which is what the updater needs — it sends
 * no credentials. Whatever destination you publish to is the exact string that goes in the app's
 * Settings > Updates > "Update folder or address".
 *
 * Destination order: CLI arg  ->  BIBLEAPP_UPDATE_DIR env  ->  package.json bibleApp.updateTarget
 * ->  the folder configured in the app (Notes/update-config.json)  ->  dist-installer/publish
 *
 * Gitea auth: GITEA_TOKEN env, else the macOS keychain item the gitea tooling already uses
 * (service "gitea-mcp"). The token is never written to disk.
 */
const fs = require('fs');
const path = require('path');
const os = require('os');
const crypto = require('crypto');
const http = require('http');
const https = require('https');
const { execFileSync } = require('child_process');

// 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.
  if (process.platform === 'darwin') {
    return path.join(os.homedir(), 'Library', 'Application Support', 'Bible App', 'user-content', 'Notes');
  }
  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) return s;   // a URL is publishable now too (Gitea), not just a folder
    }
  } catch (_) {}
  return '';
}

const argDest = process.argv[2] && !process.argv[2].startsWith('--') ? process.argv[2] : '';
const notes = process.argv[3] || '';
// The church's canonical target, tracked in git so every clone publishes to the same place.
const repoTarget = (pkg.bibleApp && typeof pkg.bibleApp.updateTarget === 'string') ? pkg.bibleApp.updateTarget.trim() : '';
const dest = argDest || process.env.BIBLEAPP_UPDATE_DIR || repoTarget || configuredDest() || path.join(ROOT, 'dist-installer', 'publish');
const isUrlDest = /^https?:\/\//i.test(dest);

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}`);
}

const srcPath = path.join(distDir, installer);
const sizeMB = (fs.statSync(srcPath).size / 1048576).toFixed(0);

/* ---- Gitea generic package registry -------------------------------------------------------- */

function giteaToken() {
  const env = (process.env.GITEA_TOKEN || process.env.GITEA_ACCESS_TOKEN || '').trim();
  if (env) return env;
  if (process.platform === 'darwin') {
    // Same keychain item the gitea MCP launcher reads, so there is one token to rotate, not two.
    try {
      const account = process.env.GITEA_KEYCHAIN_ACCOUNT || os.userInfo().username;
      return execFileSync('/usr/bin/security',
        ['find-generic-password', '-s', 'gitea-mcp', '-a', account, '-w'],
        { encoding: 'utf-8' }).trim();
    } catch (_) {}
  }
  return '';
}

// One request helper for PUT (upload) and DELETE. Streams the body so a 750 MB installer never
// has to sit in memory, and reports progress because the upload is the slow part of a release.
function giteaRequest(method, url, token, filePath) {
  return new Promise((resolve, reject) => {
    const u = new URL(url);
    const mod = u.protocol === 'https:' ? https : http;
    const headers = { Authorization: 'token ' + token };
    let total = 0;
    if (filePath) {
      total = fs.statSync(filePath).size;
      headers['Content-Length'] = total;
      headers['Content-Type'] = 'application/octet-stream';
    }
    const req = mod.request(url, { method, headers }, (res) => {
      let body = '';
      res.on('data', c => { body += c.toString('utf-8'); });
      res.on('end', () => resolve({ status: res.statusCode || 0, body }));
    });
    req.on('error', reject);
    if (filePath) {
      let sent = 0, lastPct = -1;
      const rs = fs.createReadStream(filePath);
      rs.on('data', (c) => {
        sent += c.length;
        const pct = total ? Math.floor((sent / total) * 100) : 0;
        if (pct !== lastPct && pct % 5 === 0) {
          lastPct = pct;
          process.stdout.write(`\r    uploading… ${pct}%   `);
        }
      });
      rs.on('error', reject);
      rs.pipe(req);
    } else {
      req.end();
    }
  });
}

// Gitea refuses a PUT onto a filename that already exists in the package version, so each file is
// removed first. A 404 here just means "nothing published yet", which is the normal first run.
async function giteaPut(baseUrl, token, filename, filePath, label) {
  const target = baseUrl.replace(/\/+$/, '') + '/' + encodeURIComponent(filename);
  const del = await giteaRequest('DELETE', target, token, null);
  if (del.status !== 204 && del.status !== 404) {
    console.warn(`! could not clear the previous ${label} (HTTP ${del.status}) — continuing`);
  }
  const put = await giteaRequest('PUT', target, token, filePath);
  if (put.status !== 201 && put.status !== 200) {
    throw new Error(`upload of ${label} failed: HTTP ${put.status} ${put.body.slice(0, 200)}`);
  }
  process.stdout.write('\r' + ' '.repeat(28) + '\r');
  return target;
}

// A new release uploads its installer under a NEW filename, so the superseded one is still sitting
// in the package version taking ~750 MB. Clear the stale ones out once the new manifest is live —
// never before, so a TV checking mid-publish always finds the installer its manifest names.
// One previous build is kept as a hand-rollback copy; anything older goes.
async function giteaPrune(baseUrl, token, keepFile, keepPrevious = 1) {
  const u = new URL(baseUrl.replace(/\/+$/, ''));
  // .../api/packages/<owner>/generic/<name>/<version>  ->  .../api/v1/packages/<owner>/generic/<name>/<version>/files
  const parts = u.pathname.split('/').filter(Boolean);          // api, packages, owner, generic, name, version
  const i = parts.indexOf('packages');
  if (i === -1 || parts.length < i + 5) return;
  const [owner, type, name, ver] = parts.slice(i + 1, i + 5);
  const listUrl = `${u.origin}/api/v1/packages/${owner}/${type}/${name}/${ver}/files`;
  const res = await giteaRequest('GET', listUrl, token, null);
  if (res.status !== 200) return;                                // listing is a nicety, not a gate
  let files;
  try { files = JSON.parse(res.body); } catch (_) { return; }
  if (!Array.isArray(files)) return;
  // Rank by the version in the filename, not by created_at: this server returns that field empty,
  // which would leave every build "equally old" and quietly retain the OLDEST one as the rollback
  // copy instead of the newest.
  const verOf = (name) => {
    const m = String(name).match(/(\d+(?:\.\d+)+)/);
    return m ? m[1].split('.').map(n => parseInt(n, 10) || 0) : [];
  };
  const newerFirst = (a, b) => {
    const pa = verOf(a.name), pb = verOf(b.name);
    for (let i = 0; i < Math.max(pa.length, pb.length); i++) {
      const x = pa[i] || 0, y = pb[i] || 0;
      if (x !== y) return y - x;
    }
    return new Date(b.created_at || 0) - new Date(a.created_at || 0);
  };
  const stale = files
    .filter(f => f && typeof f.name === 'string' && f.name.toLowerCase().endsWith('.exe') && f.name !== keepFile)
    .sort(newerFirst)
    .slice(keepPrevious);
  for (const f of stale) {
    const del = await giteaRequest('DELETE', baseUrl.replace(/\/+$/, '') + '/' + encodeURIComponent(f.name), token, null);
    if (del.status === 204) console.log(`  removed old build: ${f.name}`);
  }
}

/* -------------------------------------------------------------------------------------------- */

(async () => {
console.log(`Publishing v${version}`);
console.log(`  installer : ${installer} (${sizeMB} MB)`);
console.log(`  to        : ${dest}`);

const installerSize = fs.statSync(srcPath).size;
console.log('  hashing installer (integrity check)…');
const installerHash = await sha256(srcPath);

const manifest = {
  version,
  file: installer,
  size: installerSize,
  sha256: installerHash,
  notes: notes || `Bible App ${version}`,
  date: new Date().toISOString().slice(0, 10)
};

if (isUrlDest) {
  const token = giteaToken();
  if (!token) {
    console.error('No Gitea token. Set GITEA_TOKEN, or store one in the macOS keychain:');
    console.error('  security add-generic-password -s gitea-mcp -a "$USER" -w <token>');
    process.exit(1);
  }
  const manifestPath = path.join(os.tmpdir(), 'bibleapp-latest.json');
  fs.writeFileSync(manifestPath, JSON.stringify(manifest, null, 2) + '\n');

  // The installer goes up first: until latest.json names it, no app can act on a half-published
  // release. Publishing the manifest last is what makes the switch atomic from the TV's point of view.
  console.log(`  uploading installer (${sizeMB} MB)…`);
  await giteaPut(dest, token, installer, srcPath, 'installer');
  console.log('  uploading latest.json…');
  await giteaPut(dest, token, 'latest.json', manifestPath, 'manifest');
  try { fs.unlinkSync(manifestPath); } catch (_) {}
  try { await giteaPrune(dest, token, installer); } catch (e) { console.warn('! could not prune old builds:', e.message); }

  console.log(`  sha256    : ${installerHash}`);
  console.log('\nDone. The app will offer this version from Settings > Updates.');
  console.log(`Update source to set on each machine:\n  ${dest}`);
  return;
}

/* ---- Folder / network-share destination (unchanged behaviour) ------------------------------- */

fs.mkdirSync(dest, { recursive: true });
const destPath = path.join(dest, installer);
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 ~750 MB instead of ~2.7 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);
}

if (modelPublished) {
  try {
    const md = path.join(dest, 'model.gguf');
    if (fs.existsSync(md)) {
      manifest.model = 'model.gguf';
      manifest.modelSize = fs.statSync(md).size;
      console.log('  hashing model (integrity check)…');
      manifest.modelSha256 = await sha256(md);
    }
  } catch (_) {}
}

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); });