const test = require('node:test');
const assert = require('node:assert/strict');
const fs = require('node:fs');
const path = require('node:path');

const PUBLIC_DIR = path.resolve(__dirname, '../../public');

function extractLocalRefs(filePath) {
  const html = fs.readFileSync(filePath, 'utf-8');
  const refs = [];

  // Extract href/src values from <a>, <link>, <script>, <img> tags
  const refRegex = /(?:href|src)\s*=\s*["']([^"']+)["']/gi;
  let match;
  while ((match = refRegex.exec(html)) !== null) {
    const value = match[1];
    // Skip external URLs
    if (/^https?:\/\//i.test(value) || value.startsWith('//')) continue;
    // Skip data URIs, javascript:, mailto:
    if (/^(data:|javascript:|mailto:)/i.test(value)) continue;
    // Skip hash-only links
    if (value.startsWith('#')) continue;
    // Skip API endpoints (not static files)
    if (value.startsWith('/api/')) continue;
    // All Emberfall HTML uses absolute paths (starting with /)
    if (value.startsWith('/')) {
      refs.push(value); // keep leading / for PUBLIC_DIR resolution
    }
  }

  return refs;
}

test('link-checker: all local href/src references in public/*.html resolve to existing files', async () => {
  const htmlFiles = fs.readdirSync(PUBLIC_DIR)
    .filter((f) => f.endsWith('.html'))
    .map((f) => path.join(PUBLIC_DIR, f));

  const broken = [];

  for (const file of htmlFiles) {
    const refs = extractLocalRefs(file);
    const relFile = path.relative(PUBLIC_DIR, file);

    for (const ref of refs) {
      // ref starts with / → resolve relative to PUBLIC_DIR
      const target = path.join(PUBLIC_DIR, ref.slice(1));
      const exists = fs.existsSync(target);
      if (!exists) {
        broken.push(`${relFile} → ${ref} (expected ${target})`);
      }
    }
  }

  assert.equal(broken.length, 0, `Broken links found:\n${broken.join('\n')}`);
});