#!/usr/bin/env node

const VERSION_MARKUP_PATTERN = /seed\.\s*zap\.\s*subscribe\.\s*<\/h2>\s*<div[^>]*>\s*v:\s*[a-f0-9]{8}\s*•\s*\d{4}-\d{2}-\d{2}\s*<\/div>/i;

function parseArgs(argv) {
  const args = {
    url: process.env.DEPLOY_INDEX_URL ?? ''
  };

  for (let i = 0; i < argv.length; i += 1) {
    const arg = argv[i];

    if (arg === '--url') {
      args.url = argv[i + 1] ?? args.url;
      i += 1;
      continue;
    }

    if (arg === '--help' || arg === '-h') {
      console.log('Usage: node scripts/verify-deployed-index-html.mjs --url <https://example.com/index.html>');
      process.exit(0);
    }

    throw new Error(`Unknown argument: ${arg}`);
  }

  if (!args.url) {
    throw new Error('Missing deployed index URL. Pass --url or set DEPLOY_INDEX_URL.');
  }

  return args;
}

async function main() {
  const args = parseArgs(process.argv.slice(2));
  const response = await fetch(args.url, {
    headers: {
      Accept: 'text/html'
    }
  });

  if (!response.ok) {
    throw new Error(`Unable to fetch deployed index.html (${args.url}): HTTP ${response.status}`);
  }

  const html = await response.text();
  if (!VERSION_MARKUP_PATTERN.test(html)) {
    throw new Error(
      `Deployed index.html is missing version markup under the slogan at ${args.url} (expected: v: <8-char-hash> • <date>).`
    );
  }

  console.log(`Deployed index verification passed: ${args.url} includes slogan version markup.`);
}

main().catch((error) => {
  console.error(error.message);
  process.exit(1);
});