#!/usr/bin/env node
const fs = require('fs');
const path = require('path');

const root = path.join(__dirname, '..');

function read(relPath) {
  return fs.readFileSync(path.join(root, relPath), 'utf8').replace(/\r\n/g, '\n').trim();
}

function stripCursorFrontmatter(text) {
  return text.replace(/^---\n[\s\S]*?\n---\n*/, '').trim();
}

const agents = read('AGENTS.md');
const canonical = agents.replace(/\n\n\(Yes, this file also applies[\s\S]*?\)$/, '').trim();

const copies = [
  ['.cursor/rules/ponytail.mdc', stripCursorFrontmatter],
  ['.windsurf/rules/ponytail.md', text => text.trim()],
  ['.clinerules/ponytail.md', text => text.trim()],
  ['.github/copilot-instructions.md', text => text.trim()],
];

let failed = false;

for (const [relPath, normalize] of copies) {
  const actual = normalize(read(relPath));
  if (actual !== canonical) {
    console.error(`${relPath} drifted from AGENTS.md`);
    failed = true;
  }
}

if (failed) {
  console.error('Update the copied rule text or AGENTS.md so the shared body matches.');
  process.exit(1);
}

console.log('Rule copies match AGENTS.md shared body.');