pages/api/auth/login.js

export default function handler(req, res) {
  const { clientId, redirectUri } = req.body;

  if (!clientId) {
    return res.status(400).json({ error: 'Missing Client ID' });
  }

  const scopes = [
    'user-read-private',
    'user-read-email',
    'user-top-read',
    'user-library-read',
    'playlist-read-private'
  ];

  const params = new URLSearchParams({
    client_id: clientId,
    response_type: 'code',
    redirect_uri: redirectUri,
    scope: scopes.join(' '),
    show_dialog: true 
  });

  const authUrl = `https://accounts.spotify.com/authorize?${params.toString()}`;

  res.status(200).json({ url: authUrl });
}