const assert = require('assert');

// 1. Test URL detection helper
function isFacebookUrl(url) {
  try {
    const parsed = new URL(url);
    const host = parsed.hostname.toLowerCase();
    const isFb = host.includes('facebook.com') || host.includes('fb.watch') || host.includes('fb.com');
    if (!isFb) return false;
    return host.includes('fb.watch') ||
           parsed.pathname.includes('/reel') ||
           parsed.pathname.includes('/watch') ||
           parsed.pathname.includes('/videos') ||
           parsed.pathname.includes('/share/');
  } catch (e) {
    return false;
  }
}

function cleanSocialCaption(raw) {
  if (!raw) return '';
  let text = raw.replace(/(?:\s*#[^\s#]+)+\s*$/g, '').trim();
  text = text.replace(/[\uFE00-\uFE0F\uD83C-\uDBFF\uDC00-\uDFFF\u2600-\u26FF\u2700-\u27BF]+$/, '').trim();
  return text;
}

function cleanFacebookCaption(raw) {
  if (!raw) return '';
  let text = raw.trim();
  const quotedMatch = text.match(/(?:on Facebook:\s*["“]|:\s*["“])([\s\S]*?)["”]?$/i);
  if (quotedMatch && quotedMatch[1]) {
    text = quotedMatch[1];
  } else {
    const colonQuote = text.indexOf(': "');
    if (colonQuote !== -1) {
      text = text.slice(colonQuote + 3).replace(/["”]$/, '');
    }
  }
  text = text.replace(/\s*\|\s*By\s+[^|]+\|\s*Facebook.*$/i, '');
  text = text.replace(/\s*\|\s*Facebook.*$/i, '');
  return cleanSocialCaption(text);
}

console.log('Testing isFacebookUrl...');
assert.strictEqual(isFacebookUrl('https://www.facebook.com/reel/123456789'), true);
assert.strictEqual(isFacebookUrl('https://fb.watch/abcdef123/'), true);
assert.strictEqual(isFacebookUrl('https://m.facebook.com/reel/987654321/'), true);
assert.strictEqual(isFacebookUrl('https://www.facebook.com/watch/?v=11223344'), true);
assert.strictEqual(isFacebookUrl('https://www.facebook.com/share/r/abc123xyz/'), true);
assert.strictEqual(isFacebookUrl('https://www.instagram.com/reel/xyz123'), false);
assert.strictEqual(isFacebookUrl('https://www.allrecipes.com/recipe/123/cookies'), false);
console.log('✔ isFacebookUrl tests passed!');

console.log('\nTesting cleanFacebookCaption...');
const raw1 = 'Chef Gordon on Facebook: "Crispy Garlic Butter Steak Bites. 1 lb sirloin steak, 2 tbsp butter. Cook for 5 mins #food #steak"';
const cleaned1 = cleanFacebookCaption(raw1);
assert.strictEqual(cleaned1, 'Crispy Garlic Butter Steak Bites. 1 lb sirloin steak, 2 tbsp butter. Cook for 5 mins');

const raw2 = 'Delicious Homemade Pasta Recipe | 2 cups flour, 3 eggs | By Italian Kitchen | Facebook';
const cleaned2 = cleanFacebookCaption(raw2);
assert.strictEqual(cleaned2, 'Delicious Homemade Pasta Recipe | 2 cups flour, 3 eggs');
console.log('✔ cleanFacebookCaption tests passed!');

console.log('\nAll Facebook Reel unit tests passed successfully!');