const fs = require('fs');
const path = require('path');
const { execSync } = require('child_process');

// Find game-creator root (contains gallery/manifest.json)
function findRoot(dir) {
  let d = dir;
  while (d !== path.dirname(d)) {
    if (fs.existsSync(path.join(d, 'gallery', 'manifest.json'))) return d;
    d = path.dirname(d);
  }
  return null;
}

const root = findRoot(process.cwd());
const manifest = JSON.parse(fs.readFileSync(path.join(root, 'gallery', 'manifest.json'), 'utf-8'));

// Parse args
const [templateId, projectName] = args; // provided by the agent
const template = manifest.find(t => t.id === templateId);
const name = projectName || templateId;

// Determine target
const inGameCreator = process.cwd().startsWith(root);
const target = inGameCreator
  ? path.join(root, 'examples', name)
  : path.join(process.cwd(), name);

// Copy with exclusions
const EXCLUDE = ['node_modules', 'dist', 'output', '.herenow', 'progress.md', 'test-results', 'playwright-report'];

function copyDir(src, dst) {
  fs.mkdirSync(dst, { recursive: true });
  for (const entry of fs.readdirSync(src, { withFileTypes: true })) {
    if (EXCLUDE.includes(entry.name)) continue;
    const s = path.join(src, entry.name);
    const d = path.join(dst, entry.name);
    if (entry.isDirectory()) copyDir(s, d);
    else fs.copyFileSync(s, d);
  }
}

copyDir(path.join(root, template.source), target);

// Update package.json
const pkgPath = path.join(target, 'package.json');
if (fs.existsSync(pkgPath)) {
  const pkg = JSON.parse(fs.readFileSync(pkgPath, 'utf-8'));
  pkg.name = name;
  fs.writeFileSync(pkgPath, JSON.stringify(pkg, null, 2) + '\n');
}

// Update index.html title
const indexPath = path.join(target, 'index.html');
if (fs.existsSync(indexPath)) {
  let html = fs.readFileSync(indexPath, 'utf-8');
  const prettyName = name.replace(/[-_]/g, ' ').replace(/\b\w/g, c => c.toUpperCase());
  html = html.replace(/<title>[^<]*<\/title>/, `<title>${prettyName}</title>`);
  fs.writeFileSync(indexPath, html);
}

// Install
execSync('npm install', { cwd: target, stdio: 'inherit' });

// Fire-and-forget telemetry (respects DO_NOT_TRACK / DISABLE_TELEMETRY)
if (!process.env.DO_NOT_TRACK && !process.env.DISABLE_TELEMETRY) {
  const https = require('https');
  const telemetryUrl = process.env.TELEMETRY_URL || 'https://gallery-telemetry.up.railway.app';
  https.get(`${telemetryUrl}/t?event=clone&template=${encodeURIComponent(templateId)}&source=skill&v=1`)
    .on('error', () => {});
}

/use-template flappy-bird my-game
/use-template threejs-3d-starter space-shooter
/use-template castle-siege