const fs = require('fs');
const path = require('path');

// Auto-load .env file if present
const envPath = path.resolve(__dirname, '.env');
if (fs.existsSync(envPath)) {
  const envContent = fs.readFileSync(envPath, 'utf8');
  envContent.split('\n').forEach(line => {
    const match = line.match(/^\s*([\w.-]+)\s*=\s*(.*)\s*$/);
    if (match) {
      const key = match[1];
      let value = match[2].trim().replace(/^['"]|['"]$/g, '');
      if (!process.env[key]) process.env[key] = value;
    }
  });
}

const ACCESS_TOKEN = (process.env.META_ACCESS_TOKEN || '').replace(/\s+/g, '');
const PAGE_ID = (process.env.META_PAGE_ID || '1047354938453381').trim();

if (!ACCESS_TOKEN) {
  console.error('ERROR: META_ACCESS_TOKEN is missing in .env file or environment variables.');
  process.exit(1);
}

async function publishPost(message, imageUrl = null) {
  if (!PAGE_ID) {
    throw new Error('META_PAGE_ID (Page ID) is required to publish a post.');
  }

  const endpoint = imageUrl ? `${PAGE_ID}/photos` : `${PAGE_ID}/feed`;
  const url = new URL(`https://graph.facebook.com/v19.0/${endpoint}`);
  url.searchParams.append('access_token', ACCESS_TOKEN);

  const payload = imageUrl ? { caption: message, url: imageUrl } : { message };

  const res = await fetch(url.toString(), {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(payload)
  });

  const data = await res.json();
  if (data.error) {
    throw new Error(`Meta Graph API Error: ${data.error.message}`);
  }
  return data;
}

if (require.main === module) {
  const pageId = process.argv[2] || PAGE_ID;
  const msg = process.argv[3] || 'اختبار النشر التلقائي عبر Tripz AI Agent';
  if (!pageId) {
    console.error('Please provide Page ID as first parameter: node scripts/publish-facebook-post.js <PAGE_ID> "[Message]"');
    process.exit(1);
  }
  publishPost(msg).then(res => console.log('Post published successfully:', res)).catch(err => console.error(err.message));
}

module.exports = { publishPost };