import { sql } from '@vercel/postgres';
import jwt from 'jsonwebtoken';
import { JWT_SECRET } from '../../../lib/auth-secret.js';

export default async function handler(req, res) {
  if (req.method !== 'GET') {
    return res.status(405).json({ error: 'Method not allowed' });
  }

  try {
    const authHeader = req.headers.authorization;
    
    if (!authHeader || !authHeader.startsWith('Bearer ')) {
      return res.status(401).json({ error: 'Authentication required' });
    }

    const token = authHeader.substring(7);
    
    try {
      const decoded = jwt.verify(token, JWT_SECRET);
      
      // Get user data from database
      const result = await sql`
        SELECT id, email, role, created_at 
        FROM users 
        WHERE id = ${decoded.userId}
      `;

      if (result.rows.length === 0) {
        return res.status(401).json({ error: 'User not found' });
      }

      const user = result.rows[0];
      res.status(200).json(user);

    } catch (jwtError) {
      console.error('JWT verification error:', jwtError);
      return res.status(401).json({ error: 'Invalid token' });
    }

  } catch (error) {
    console.error('Auth verification error:', error);
    res.status(500).json({ error: 'Internal server error' });
  }
}