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

const repoRoot = process.cwd();
const pkgPath = path.join(repoRoot, 'package.json');
const publicDir = path.join(repoRoot, 'public');
if (!fs.existsSync(pkgPath) || !fs.existsSync(publicDir)) process.exit(0);

const pkg = JSON.parse(fs.readFileSync(pkgPath, 'utf8'));
const version = pkg.version;
const failures = [];

function git(args) {
  return cp.execFileSync('git', args, { cwd: repoRoot, encoding: 'utf8' }).trim();
}

function walkHtmlFiles(dir) {
  const out = [];
  for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
    const full = path.join(dir, entry.name);
    if (entry.isDirectory()) out.push(...walkHtmlFiles(full));
    else if (entry.isFile() && entry.name.endsWith('.html')) out.push(full);
  }
  return out;
}

function isLocalAsset(rawUrl) {
  return !/^(?:[a-z]+:|\/\/|#)/i.test(rawUrl);
}

for (const file of walkHtmlFiles(publicDir)) {
  const rel = path.relative(repoRoot, file);
  const content = fs.readFileSync(file, 'utf8');
  for (const match of content.matchAll(/<link\b[^>]*href=["']([^"']+\.css(?:\?[^"']*)?)["']/gi)) {
    const url = match[1];
    if (isLocalAsset(url) && !new URLSearchParams((url.split('?')[1] || '')).get('v')?.includes(version)) {
      failures.push(rel + ': stylesheet version does not match package.json');
    }
  }
  for (const match of content.matchAll(/<script\b(?![^>]*type=["']application\/json["'])[^>]*\bsrc=["']([^"']+\.js(?:\?[^"']*)?)["']/gi)) {
    const url = match[1];
    if (isLocalAsset(url) && !new URLSearchParams((url.split('?')[1] || '')).get('v')?.includes(version)) {
      failures.push(rel + ': script version does not match package.json');
    }
  }
}

const staged = git(['diff', '--cached', '--name-only', '--diff-filter=ACMR']).split(/\n+/).filter(Boolean);
const codeTouched = staged.some(file => /^(public\/.*\.(html|css|js)|server\.js|package\.json|package-lock\.json)$/.test(file));
const projectMapTouched = staged.includes('PROJECT_MAP.md');
const changelogTouched = staged.includes('CHANGELOG.md');
if (codeTouched && !changelogTouched) failures.push('CHANGELOG.md must be staged when app code, assets, or version files change.');
if (codeTouched && fs.existsSync(path.join(repoRoot, 'PROJECT_MAP.md')) && !projectMapTouched) {
  failures.push('PROJECT_MAP.md must be staged when app code or frontend state/routes change.');
}

const stagedPackageDiff = staged.includes('package.json')
  ? git(['diff', '--cached', '--', 'package.json'])
  : '';
if (stagedPackageDiff.includes('"version"') && fs.existsSync(path.join(repoRoot, 'CHANGELOG.md'))) {
  const changelog = fs.readFileSync(path.join(repoRoot, 'CHANGELOG.md'), 'utf8');
  if (!changelog.includes('## [' + version + ']') && !changelog.includes('## [Unreleased]')) {
    failures.push('CHANGELOG.md must mention the current package.json version or contain an [Unreleased] section.');
  }
}

if (failures.length) {
  console.error('Release verification failed:');
  for (const failure of failures) console.error('- ' + failure);
  process.exit(1);
}